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In this paper, a capacitive RF MEMS switch working in shunt configuration is designed and optimized using FEM software. An electrostatically actuated fixed–fixed type shunt switch is optimised for low pull-in voltage. The thickness of the membrane and the actuating gap is optimized for low pull-in voltage and high capacitance ratio. The effect of different meanders, perforations, slits and device dimensions were also analyzed. The final device has a pull-in voltage of 3.74 V, down capacitance of 28.6 pF, up capacitance of 160 fF and a capacitance ratio of 178.125. The switch shows peak isolation of 43.3 dB at 39.7 GHz and isolation better than 30 dB over the entire Ka band.

Electrochemical capacitors (ECs) have emerged as reliable and fast-charging electrochemical energy storage devices that offer high power densities. Their use is still limited, nevertheless, by thei...

A multifunctional gate dielectric material based on dual cross-linked aromatic polythiourea (c-PTU) networks for organic field-effect transistors is presented. Tailoring the dual covalent and noncovalent cross-links in the c-PTU gate dielectric enables all the advantageous capabilities of excellent insulating properties, including high capacitance, good solvent resistance and thermal stability, as well as low-temperature solution processing and photo-patterning.

Redox porous organic polymers are promising pseudocapacitive materials. However, their specific capacitance still needs further elevation. Herein, we report a novel dihydrophenazine derived porous organic polymer, GT-POP-1. The GT-POP-1 based electrode and asymmetric device show high specific capacitance and energy density metrics of 97.1 mF cm−2 and 7.3 μW h cm−2.

In the recent times, global interest on plant-based research has increased significantly. Through this article, a simple heat treatment method to synthesize Centella asiatica (CA) powder has been suggested. The synthesized samples have been subjected to various structural and morphological characterizations, in addition to electrochemical studies. Although the medicinal value of Centella asiatica is well known, its use in other applications is hardly explored. Hence, by combining the cyclic nature of CA and the layered structures of carbonaceous materials, composites of Centella asiatica with graphite powder, GO and rGO have been prepared for the first time and their photocatalytic and electrochemical properties have been investigated. In spite of some agglomeration and flake like structures, the nanosize (14 nm) of the prepared CA sample contributes largely to the aforementioned applications. One of the phenomenal aspects of the synthesized sample is that the low energy gap and high conductivity makes it an excellent photocatalytic material which is also evident from its ability to decolorize AO 8 dye under UV light to a great extent. Among the composites of CA-carbonaceous materials prepared, Centella asiatica-rGO exhibited superior electrochemical properties with high capacitance and low charge transfer resistance.

We employed capacitance to evaluate the kinship and interspecific variation of homoploid hybrid conifer Pinus densata, P. tabuliformis, P. yunnanensis and artificial hybrids of P. tabuliformis (maternal parent) and P. yunnanensis (paternal parent) which were cultivated and selected in the common garden experiment. By measuring capacitance spectra under different voltage frequencies, we could differentiate different germplasms based on the electrical response. We aims to demonstrate that P. densata as the hybrid of P. tabuliformis and P. yunnanensis based on the capacitance values of the species, and to provide new evidence to the previously known biological evidence, as well as and the parental effect on the hybrids. Our results revealed that capacitance values between the species are significantly different in the spectra where P. yunnanensis positioned at the lowest and P. densata was much higher than all other species, indicating that P. densata had possessed a great capacity to store electrical energy. The capacitance spectra of P. densata and the artificial hybrid are not similar, which rejected our hypothesis. Both of the capacitance values of P. densata and the hybrids were closer to P. tabuliformis than to P. yunnanensis, which shows that the maternal influence was stronger than the paternal influence. Correlation analysis on the relationship between capacitance and fitnessrelated characteristics showed that capacitance is negatively correlated to mortality rate, and positively correlated with second-year survival rate. High capacitance values of P. densata and some of the hybrids reveal their superior adaptability to harsh environment in the Tibet Plateau. We concluded that capacitance as a new indicator for plant fitness and evolution evidence of homoploid hybrid conifers.

ZnCo2O4 as electrode material for supercapacior has been extensive investigated owing to its unique structure characteristics and high capacitance. However, the conductivity still cannot reach the ...

Supercapacitors based on carbon nanomaterials are attracting much attention because of their high capacitance enabled by large specific surface area. The introduction of heteroatoms such as N or O enhances the specific capacitance of these materials. However, the mechanisms that lead to the increase in the specific capacitance are not yet well-studied. In this Letter, we demonstrate an effective method for modification of the surface of carbon nanowalls (CNWs) using DC plasma in atmospheres of O

Transition metal phosphides (TMPs) are emerging as high-performance and promising electrode materials for use in asymmetric supercapacitors (ASCs). Herein, we demonstrate that cobalt phosphide (CoP...

We demonstrate a MIM capacitor structure using ZrO2 for the dielectric layer which exhibits a 25% capacitance increase (from ~43fF/mm2 to >55fF/mm2 for a ~55A film) with minimal leakage current increase compared to Hf based dielectrics, extending the usefulness of MIM on-chip decoupling capacitors. The MIM structure, suitable for BEOL processing is TiN/ZrO2/TiN combined with an anneal which is shown to improve the capacitance vs. leakage performance compared to doped and undoped HfO2 based control structures. GI-XRD measurements demonstrate that the capacitance increase corresponds with a phase transformation of the ZrO2 from amorphous to cubic phase, which is shown to have a dielectric constant (k) up to 35. Reliability models based on hard-breakdown (HBD) show that this structure exceeds the end-of-life targets. Servers and high-performance chips have historically relied on on-chip decoupling capacitors (decap) to reduce power supply noise in order to achieve 3 – 5.4 GHz operating frequency. Although packaging decap can be very effective at mitigating low and mid-frequency noise, on-chip decap, such as MIMCAP, is critical for mitigating mid and high-frequency noise. As Fig. 1 shows, an increase in on-chip decap can result in a significant performance benefit, due to their fast response time slowing the fastest droops, giving time for slower response elements to contribute. One method of achieving this increased decap is to increase the k of the material being used as the insulator in the MIMCAP. Following high-k gate dielectric technology, HfO2 and other Hf based dielectric stacks have been used for this layer successfully [1]. But there is a significant difference in the thermal budget that the dielectric is exposed to following the deposition between gate dielectric and MIMCAP applications. The gate dielectric, deposited prior to any metallization, will typically be exposed to a relatively high thermal budget compared to the insulator layer of a decoupling MIMCAP, which is usually placed between wiring levels in the back end of the line (BEOL) [2]. Since the thermal budget after deposition will affect the crystal structure of a material, and different crystal phases of the same material can have dramatically different dielectric constants [3], the actual dielectric constant of a particular high-k material may vary significantly depending on whether it is used as the gate dielectric or as the MIM insulator. In this work, we explore the use of a ZrO2 as the high- k layer for MIMCAP applications and show that its low crystallization temperature enables it to achieve a significantly higher k value compared to HfO2 when processed under BEOL compatible thermal conditions. Fig. 2 shows the development of the high-k phase of a 55A ZrO2 film as the anneal temperature is increased. The peaks at 35, 42 and 52 are the signature of the bottom TiN electrode and do not change with anneals; but the peaks at 30.2 and 50.3 degrees, which are seen to develop as the anneal temperature increases, match with the 111 and 220 planes of the cubic phase of ZrO2. MIMCAPs built using similarly annealed ZrO2 layers as dielectrics exhibit an increase in capacitance as shown in Fig. 3a: there is a slight increase after anneal A, significantly more increase after anneal B, and additional moderate increases after C and D. No such capacitance increase is seen when Hf based dielectrics are used (Fig. 3b). The maximum capacitance is found to be ~56fF/um2 after anneal D compared to ~43fF/um2 for the unannealed device, an increase of more than 25%, while the leakage current remains virtually unchanged at 1V, and increases by 2. Thus, we can achieve high capacitance with a relatively thick high-k layer, keeping the leakage current low, all while maintaining compatibility with BEOL processing. [1] T. Ando et al., “CMOS Compatible MIM Decoupling Capacitor with Reliable Sub-nm EOT High-k Stacks for the 7nm Node and Beyond,” Tech. Dig. IEDM 2016, pp. 9.4.1 - 9.4.4. [2] K. Fischer et al., “Low-k Interconnect Stack with multi-layer Air Gap and Tri-Metal-Insulator-Metal Capacitors for 14-nm High Volume Manufacturing,” IEEE Interconnect Tech. Conf. 2015, 10.1109/IITC-MAM.2015.7325600. [3] X. Zhao and D. Vanderbilt, “First-principles Study of Electronic and Dielectric Properties of ZrO2 and HfO2” MRS Proceedings, 747. doi:10.1557/PROC-747-T5.2/N7.2. Figure 1

The lightweight carbon nanotube (CNT) has been attracting great attention in the field of flexible electronics, but it is still a challenge in increasing both high capacitance and high energy densi...

Guidelines for the selection and placement of decoupling capacitors that work well for one-sided or two-sided printed circuit boards are not appropriate for multilayer boards with power and ground planes. Boards without internal planes take advantage of the power bus inductance to help decouple components at the higher frequencies. An effective decoupling strategy for multilayer boards must account for the low inductance and relatively high capacitance of the power bus.

We have developed a capacitance imaging technique using polypyrrole (PPy)-coated multi walled carbon nanotube multi electrode array (PPy-MWCNT-MEA) for the discrimination of lipid region in atherosclerotic plaque ex vivo. The lipid region in the atherosclerotic plaque ex vivo, derived from apolipoprotein-E receptor-deficient mice, exhibits higher capacitance than does the lipid-free region. This consequently allows the capacitance imaging of the lipid region. The results from this research are consistent with an earlier study, which reported that a relatively high capacitance was measured from free fatty acid-treated adipocyte cells. Compared to the titanium nitride multi electrode array, the PPy-MWCNT-MEA yields better capacitance imaging of the lipid region, which can be ascribed to the improved contact between the PPy-MWCNTs and the atherosclerotic plaque ex vivo.

In this study, taking Ni enriched water hyacinth (WH, Eichhornia crassipes) as an example, we prepared porous Ni–N doped carbon material (WHPC@Ni) with high supercapacitive performance via fast pyr...

Supercapacitors with high energy density and high power density have attracted numerous attentions. Here, we successfully synthesized Ni6MnO8 material by a fast, facile, and cost-effective method, which the area specific capacitance was found to be as high as 1113 mF/cm2 at a current density of 1 mA/cm2. Further, the asymmetric supercapacitor was assembled by using Ni6MnO8 as the positive electrode and graphene as the negative electrode with an operation potential from 0 to 1.4 V. It exhibited an area specific capacitance of 69.1 mF/cm2 at 0.5 mA/cm2 and stable cycling performance which presented about 80% capacitance retention after 5000 cycles at 5 mA/cm2. The energy density of graphene//Ni6MnO8 supercapacitors was calculated to be 18.81 mWh/cm2 at a power density of 350.1 mW/cm2 and still remained 5.8 mWh/cm2 at a power density of 6990.7 mW/cm2, meaning that the asymmetric supercapacitor combine excellent power density and energy density.

Self-assembled ZnCo2O4 micro-urchins grown on nickel foam were synthesized by a simple hydrothermal method. The ZnCo2O4 micro-urchin exhibited high capacitance (1.043 C cm−2 at 1 mA cm−2) and excellent cycle stability with 82.5% capacitance retention after 10000 cycles at 10 mA cm−2. In addition, an energy storage device based on ZnCo2O4 micro-urchins also exhibits a high specific capacitance of 467 mF cm−2 with an energy density of 1.27 mW h cm−3 and a good cycling performance of 80.6% retention after 10,000 cycles at the current density of 10 mA cm−2.

Here we describe an aqueous asymmetric supercapacitor assembled using Co(OH)F nanorods on Ni foam (Co(OH)F@NF) as the positive electrode and layered Ti3C2Tx paper on Ni foam (Ti3C2Tx@NF) as the negative electrode. The Co(OH)F@NF was fabricated by a facile hydrothermal process. The nanorods were constructed as three-dimensional networks with stable structures and good durability in electrochemical reactions. As expected, the Co(OH)F@NF exhibited excellent capacitance (1265 mF cm−2 at 1 mA cm−2) and wonderful rate performance (90% from 1 to 10 mA cm−2). The Co(OH)F@NF//Ti3C2Tx@NF asymmetric supercapacitor devices showed high capacitance of 376 mF cm−2 and excellent rate capacity of 91% retention. When the two Co(OH)F@NF//Ti3C2Tx@NF devices were combined in series, a red led bulb could be lit for 12 minutes, further corroborating the possibility of the devices being used for practical applications.

The multilayered ceramic capacitor (MLCC) is a key component of electronic equipment, such as smartphones, portable PCs and electric vehicles, which contain a number of MLCCs. As MLCCs distribute and control the amount of current flowing through circuits, remove noise, and prevent malfunction, MLCCs play a key role in enabling electronic devices to have high performance, multi-functionality, and high integration. This review highlights the critical issues and recent progress in developing highly volumetric-efficient and high capacitance MLCCs from the viewpoint of designing a BaTiO3-based dielectric layer. After a brief introduction of MLCCs and dielectric materials, we summarize the current issues in developing BaTiO3-based dielectric materials for MLCCs with high performance and reliability and describe the strategies to optimize dielectric properties through nano/microstructure control, chemical modification and doping. Finally, we provide an outlook on the development and future application of MLCCs. It is anticipated that this review can serve as an overview and evaluation of state-of-the-art synthesis and design of BaTiO3-based dielectric materials for MLCC applications.

We present experimental studies of alternating current (AC) electrowetting dominantly influenced by several unique characteristics of an ion gel dielectric in its capacitance. At a high-frequency region above 1 kHz, the droplet undergoes the contact angle modification. Due to its high-capacitance characteristic, the ion gel allows the contact angle change as large as Δθ = 26.4°, more than 2-fold improvement, compared to conventional dielectrics when f = 1 kHz. At the frequency range from 1 to 15 kHz, the capacitive response of the gel layer dominates and results in a nominal variation in the angle change as θ ≈ 90.9°. Above 15 kHz, such a capacitive response of the gel layer sharply decreases and leads to the drastic increase in the contact angle. At a low-frequency region below a few hundred Hz, the droplet’s oscillation relying on the AC frequency applied was mainly observed and oscillation performance was maximized at corresponding resonance frequencies. With the high-capacitance feature, the ion gel significantly enlarges the oscillation performance by 73.8% at the 1st resonance mode. The study herein on the ion gel dielectric will help for various AC electrowetting applications with the benefits of mixing enhancement, large contact angle modification, and frequency-independent control.

Multilayer ceramic capacitors (MLCCs), characterized by their high capacitance and compactness, are in high demand due to the rapid development of modern electronics. Section 10.2 of this chapter begins with a discussion of the size effect for grain sizes down to 5 nm . In Section 10.3 of this chapter, the chemical coating method for the preparation of core-shell structured dielectric ceramics is reviewed. In Section 10.4 of this chapter, the most recently reported MLCCs with greatly improved energy-storage densities are reviewed. Finally, some conclusions and considerations for the prospects for MLCCs were drawn.

The past decade has witnessed the boom of porous carbon materials, especially three-dimensional (3D) ones, as supercapacitor electrode materials. Their large surface areas, tunable pore volumes, adjustable degrees of pore interconnectivity, and the potential to possess hierarchical porous networks have enabled them to achieve simultaneously high capacitance and excellent rate capability. This feature is challenging for non-3D counterparts but favorable for supercapacitors. However, behind the prosperity come the problems, and unfortunately, most of the issues are left unacknowledged and unaddressed in the literature available. This perspective aims to identify these problems, discuss the reasons for overlooking, and provide possible solutions to address these issues. The author wishes this article will draw the attention of researchers in electrochemical energy storage to tackle these roadblocks in the future development of 3D porous carbon electrodes in supercapacitors.

Low-voltage, organic field-effect transistors (OFETs) have a high potential to be key components of low-cost, flexible, and large-area electronics. However, to be able to employ OFETs in the next generation of the electronic devices, the reduction of their operational voltage is urgently needed. Ideally, to be power efficient, OFETs are operated with gate voltages as low as possible. To fulfill this requirement, low values of transistor threshold voltage (Vt) and subthreshold swing (SS) are essential. Ideally, Vt should be around 0 V and SS close to 60 mV/dec, which is the theoretical limit of subthreshold swing at 300 K. This is a very challenging task as it requires the gate dielectric thickness to be reduced below 10 nm. Here, the most promising strategies toward high capacitance dielectrics for low voltage operated OFETs are covered and discussed.

The present study focuses on the synthesis of size-controlled nano-ceria (CePC NPs) from aqueous extract of Pouteria campechiana via self-propagating solution combustion synthesis. The extract volume is varied to know the influence of extract on the physical, optical and surface properties of CePC NPs. The p-XRD study revealed the size-controlled synthesis of CePC NPs from 11.46 to 15.59 nm. The nano-regime size is having a definite effect on the biomedical and sensing applications of the NPs. The specific surface area of 34.04 m2g-1, with a maximum pore diameter of 24.33 nm was observed for CePC NPs with a size 11.46 nm. The antioxidant behaviour was maximum with 71.73 % of DPPH inhibition at concentration 500 μg/mL. In vitro A546 cancer suppressive activity of CePC NPs reveals that phytochemicals functionalized by highest volume during synthesis showed a low IC50 value of 118.92 μg/mL despite the large size. The bio-derived NPs shows RBC membrane protection above ∼93 %, owing to its non-toxic behaviour. The CePC NPs exhibits suitable antibacterial applications against Bacillus subtilis, Staphylococcus aureus, Pseudomonas syringae and Pseudomonas aeruginosa. The bio-fabricated samples exhibited the best hydrogen diffusion value of 1.035 ×10-5. The Rct values of the CePC NPs are comparable with each other (∼ 73.03 -90.39 Ω) with high capacitance, and hence the bio electrodes have superlative efficiency in sensing the Paracetamol drug.

As an excellent electrode material for supercapacitors, it should have high capacitance like transition metal oxides and good stability like carbon materials. In this work, we reported a novel comp...

With the rapid development of wearable electronics, smart devices with fast response to external stimulus are attracting our considerable attention. Among them, multifunctional integrated devices which can integrate many functions in one device and miniaturize their volume are much needed. Herein, single Janus iodine-doped rGO/rGO film(IrGO/rGO) with multi-responsive actuation and high capacitance is developed for smart integrated electronics. When served as multiple-responsive actuator materials including humidity, heat and electricity actuation, the single Janus IrGO/rGO film shows exceptionally large static deformation, fast response bending rate up to 70° per second and highly durable repeatability. While worked as electrodes, IrGO/rGO film based supercapacitors exhibit remarkable electrochemical performances with a specific areal capacitance of 12.4 mF cm−2 at a current density of 0.01 mA cm−2 and capacitance retention of 89.2% after 5000 cycles. Based on these extraordinary properties, a smart mechanical gripper and a multifunctional integrated supercapacitor device with smart stimulus-controlled reversible actuator switches were successfully built using the single IrGO/rGO film as the functional materials, demonstrating the application potential in different kinds of smart multifunctional integrated devices.

Graphene Oxide (GO)/manganese oxide (MnO2) composites with different feeding ratio are synthesized by a simple and economic soft chemical route in a water-isopropyl alcohol under different cooling method. The SEM results show that MnO2 nanoparticle with smaller size (8nm) homogeneously coats on the surfaces of graphene oxide under quick ice quenching, and the better electrochemical properties is obtained. The composites with feeding ratio 1:9 have maximum capacitance value, because of agglomerate induced by too much MnO2. The specific capacitances calculated by galvanostatic charge/discharge curve were 312.87 F/g by ice water quenching and 253.12 F/g by reflux cooling to room temperature. The GO/MnO2 electrode retained about 85.12% (with quick ice quenching) and 88.16% (with reflux cooling) of initial capacitance after 1000 cycles, respectively.

3D Porous carbon derived from pine needle is prepared by hydrothermal followed KOH activation process. The high surface area (1175 m2 g−1) and rich hierarchical pores provide the electrode with high capacitance. And the abundant surface oxygen functional groups offer additional pseudo-capacitance, which would increase the capacitance. It delivers the capacitance of 348 F g−1 at 1 A g−1 in a three-electrode cell. The well performance and the low cost make the derived porous carbon as a promising electrode.

With the rapid development in portable and wearable electronics, it will be of great convenience if flexible supercapacitors can be easily mounted/disassembled from different substrates at our will, which will largely expand their application scenarios. Herein, inspired by a sticky note, a new family of flexible sticky-note supercapacitors with repeated adhesive performance has been developed by employing a novel kind of sticky aligned carbon nanotube array electrode. The sticky-note supercapacitor demonstrated high capacitance and can be easily and repeatedly attached onto various substrates including cloth, glass, paper, plastic and metal. For up to 200 attaching/removing cycles on different substrates, the capacitance of the supercapacitor note can be well maintained at above 99%.

•High capacitance on In0.53Ga0.47As epitaxial layers grown on Si substrates•Achievement of capacitance equivalent thickness lower than 1.5nm with low leakage current•Enhancement of electrical performances by a surface treatment using trimethylaluminum.

Submicron Ti3AlC2 grains are grown in molten salt. Etching the grains gives rise to small-sized Ti3C2Tx MXene particulates with capacitance more than twice that of the large ones derived from conventional high-temperature synthesis. Detailed electrochemical, structural, and spectroscopic studies demonstrate that increased capacitance predominantly originates from a decrease in the lateral size of the small Ti3C2Tx MXene particulates.

Background: Binary metal oxides, such as spinel nickel cobaltite (NiCo2O4), are attractive pseudocapacitive materials in electrochemical supercapacitors because they have higher theoretical capacitance than carbonaceous materials, and higher electronic conductivity than conventional monometal oxides. However, their practical pseudocapacitive performance is dramatically hindered by traditional electrode assembly technologies, through which extremely high internal resistances are generated at supplementary interfaces within nanostructured binary metal oxides and between binary metal oxides/current collector. Methods: Here, we develop polymer-binder-free hybrid electrodes by employing Ni nanotube arrays as 3D current collectors for the loading of electroactive NiCo2O4 nanosheets (Ni/NiCo2O4 nanotube array). Results: As a result of the remarkably enhanced electronic conductivity and ion diffusion, the Ni/NiCo2O4 nanotube array electrodes exhibit a specific capacitance of as high as ~753 F g-1 at a scan rate of 5 mV s-1 and rate performance, in addition to a long-term cycling stability. Conclusion: The outstanding performance makes the Ni/NiCo2O4 nanotube array to be an efficacious power source electrode in a wide range of applications.

$$\hbox {V}_{2}\hbox {O}_{5}$$ nanomaterials with rough surface were synthesized using commercial $$\hbox {V}_{2}\hbox {O}_{5}$$ , ethanol (EtOH) and $$\hbox {H}_{2}\hbox {O}$$ as the starting materials by a simple hydrothermal route and combination of calcination. The electrochemical properties of $$\hbox {V}_{2}\hbox {O}_{5}$$ nanomaterials as electrodes in a supercapacitor device were measured using cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) method. $$\hbox {V}_{2}\hbox {O}_{5}$$ nanomaterials exhibit the specific capacitance of 423 F $$\hbox {g}^{-1}$$ at the current density of 0.5 A $$\hbox {g}^{-1}$$ and retain 327 F $$\hbox {g}^{-1}$$ even at the high current density of 10 A $$\hbox {g}^{-1}$$ . The influence of the ratio of $$\hbox {EtOH/H}_{2}\hbox {O}$$ , the calcined time and temperature on the morphology, purity and electrochemical property of the products is discussed in detail. The results revealed that the ratio of $$\hbox {EtOH}\hbox {/}\hbox {H}_{2}\hbox {O}= 10\hbox {/}25$$ and calcination at $$400{^{\circ }}\hbox {C}$$ for 2–4 h are favourable for preparing $$\hbox {V}_{2}\hbox {O}_{5}$$ nanomaterials and they exhibited the best electrochemical property. The novel morphology and high specific surface area are the main factors that contribute to high electrochemical performance of $$\hbox {V}_{2}\hbox {O}_{5}$$ nanomaterials during the charge–discharge processes. It turns out that $$\hbox {V}_{2}\hbox {O}_{5}$$ nanomaterials with rough surface is an ideal material for supercapacitor electrode in the present work.

It is often reported that pseudocapacitive electrodes' mechanical stability seriously limited their cycling performances in supercapacitors due to their quick fall off the electrode matrix during frequent fast charge/discharge process. In this work, we have demonstrated the mechanical enhancement in hierarchical NiMoO4 nanosheet arrays (NSAs) on free-standing substrates after introducing Co3O4 hierarchies. Under sonication vibration environment, the mechanical stability of Co3O4@NiMoO4 NSAs was enhanced by similar to 70% compared to that of the pure NiMoO4 ones. Moreover, the Co3O4@ NiMoO4 NSAs can display a high specific capacitance of 1476 F g(-1) at the current density of 1 A g(-1), and an excellent rate capability (keeping 81% at 20 A g(-1)). And after 2000 cycles, high capacitance retention of 96% was achieved for the Co3O4@ NiMoO4 core/ shell NSAs, while only 70% for the pure NiMoO4 ones. (C) 2017 Elsevier B.V. All rights reserved.

Porous carbons derived from biomass are one current hotspot in exploring advanced electrode materials for supercapacitors. In this work, based on nanoparticles from squid inks, an N-doping porous carbons with a unique “shell@pearls” structure has been fabricated through a direct carbonization/activation procedure. Remarkably, a fantastic structural evolution from core-shell, yolk-shell to the porous matrix embedded with small spheres (like pears in shell) has been observed. The as-obtained products exhibit a hierarchical porosity comprised of micro-, meso- and macropores, as well with a large surface area (1957 m2 g−1) and N-doping (2.09%). As the electrode materials for supercapacitors, the “shell@pearls”bio-carbons show the very high capacitance of 329 F g−1 at 0.5 A g−1 and 265 F g−1 at 30 A g−1 and also a superior retention of 99.5% after 10000 cycles at 5 A g−1.

The potential for use of porous silicon in designing varicaps with high capacitance ratios satisfying the requirements of microelectronics and microsystems engineering is considered. The technique for the fabrication of capacitor structures via the electrodeposition of copper onto porous silicon is presented. The morphological features of the obtained structures are examined and the specific capacitance of varicaps is determined. The prospects for the application of varicaps based on porous silicon in integrated electronics are outlined.

Supercapacitor has recently received more and more extensive attention of researchers worldwide. V2O5 as an ideal electrode for supercapacitor has attracted great attention due to its mixed oxidation states, natural abundance, high capacitance, and great energy density. In this review, the effect of the morphology, structure, and composition of V2O5-based nanomaterials as electrode has been discussed. Besides, the symmetric and asymmetric supercapacitors using V2O5-based nanocomposites as electrode show high-energy density and wide voltage window, which can compete with batteries.

This paper explains about wide range of applications for Laminated Bus Bar used for high and low power applications. Authors also explains ways to effective utilize laminated bus bar when compared to conventional bus bar. Laminated bus bars are designed with low stray inductance and high capacitance with a uniform current distribution in conducting plate. Parameters like Length, Width, material thickness and other miscellaneous parameters effect Laminated bus bar performance. With a proper design of Laminated bus bar it can best utilized, laminated bus bar are suitable for many low and high power applications which are discussed in this paper. Replacing conventional bus bar with laminated bus bar additional advantages are achieved like lighter weight, less space and lower maintenance.