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Wrapping SnO2 nanowires with appropriate oxide shell materials could produce a significant impact on their photoelectrical and gas sensing performance. In this work, a novel highly crystalline SnO2/Zn2SnO4 core–shell nanowire has been fabricated using a sequential chemical vapor deposition (CVD) method. Cross-sectional transmission electron microscopy (TEM) reveals that the SnO2 core is surrounded by five or six Zn2SnO4 domains, displaying a characteristic quasi-hexagonal cross section. Extensive crystallographic orientation study shows that the growth direction of the core is along the SnO2 [101] direction, parallel to that of the shell Zn2SnO4 [101], i.e. SnO2 [101]Zn2SnO4 [101]. While the Zn2SnO4 outer shells have two crystallographic relationships between the SnO2 core, SnO2 (101̅)Zn2SnO4 (131̅) and SnO2 (020)Zn2SnO4 (11̅1̅), one group of the domains sticks to the SnO2 {111} plane and the other group grows on the SnO2 {020} plane. All the Zn2SnO4 shell domains expose their {111} plane as the ending surface. The tetragonal SnO2 core growing along the [101] direction makes it nearly invisible when collecting electron diffraction from the side view of the core–shell nanowire. The geometrical model deduced from cross-sectional TEM results suggests that there is only one low index zone axis for the core nanowire, i.e. SnO2 [010], along which Moiré fringes and the very rarely seen multiple double-diffraction effect were observed and discussed in detail. We would like to call the attention of researchers to be careful in correlating the microstructure of core–shell nanowires with their physical properties, because merely observing from the radial direction might not be able to reveal the true interface structure. [ABSTRACT FROM AUTHOR]

Different from the common metal catalysts (e.g., Au) employed in catalyst-assisted growth of one-dimensional (1D) structures, a variety of molybdenum oxide (MoO3) layered 1D structures were synthesized using a group of alternative alkali metal based catalysts. In contrast to the sole axial growth mode found in conventional catalyst-assisted growth, two different growth modes were observed for the MoO3 1D growth here: transverse growth and axial growth. In the transverse mode, the 1D structures grow perpendicularly to the catalyst-deposition axis with the catalyst particles sitting on the side surfaces of the 1D structures; whereas in the axial mode, the growth direction is along the catalyst-deposition axis. The growth modes were explained by a modified vapor–solid–solid (VSS) mechanism, and the factors that affect the growth were explored. Based on the proposed growth mechanism, the growth was extended to a large family of alkali metal based catalysts and hierarchical structures were realized by multiple-growth approaches. This growth mechanism provides a new approach to control the orientation of 1D structures and can be applied to different layered materials. [ABSTRACT FROM AUTHOR]

We show that higher alcohols can be produced with high selectivity from syngas over three-dimensionally ordered macroporous Cu-Fe catalyst. The catalyst was developed by using a glyoxylate route colloidal crystal template method. The high intrinsic activity was ascribed to three factors. First, the unique ordered structure has a large pore size and interconnected macroporous tunnels of the catalyst with a large accessible surface area improves the catalytic activity. Second, a high density of uniformly distributed defective Cu0 and χ-Fe5C2 nanoparticles derived from the glyoxylate route helps to provide abundant, active, stable dual sites. Third, atomic steps on the Cu surface, induced by planar defects and lattice strain, serve as high-activity oxygenation sites; and active χ-Fe5C2 chain-growth sites surrounds the defective and strained form of Cu surface intimately, which results in a synergetic effect between the active and stable Cu-FexCy dual sites for higher alcohols synthesis. [ABSTRACT FROM AUTHOR]

Abstract: The axial Zn2GeO4/ZnO nanowire heterojunction was successfully synthesized via chemical vapor deposition (CVD) approach. The transmission electron microscopy (TEM) study revealed that the growth follows the vapor–liquid–solid (VLS) mechanism with an orientation relationship of (300)Zn2GeO4//(−110)ZnO and (003)Zn2GeO4//(110)ZnO, in which a small lattice mismatch between Zn2GeO4 and ZnO was observed. The ZnO segment grows out axially along Zn2GeO4 ternary nanowire and its length can be tuned from tens of nanometers to over 10μm by adjusting the ZnO source supply. This ternary/binary nanowire heterojunction shows a diode effect via nano-manipulators in-situ measurement under field emission scanning electron microsocpy (FESEM). [Copyright &y& Elsevier]

Abstract: Undoped and Co-doped BaTiO3 nanoparticles were synthesized by a one-step sol-precipitation method. For all the samples, X-ray diffraction showed characteristic diffraction lines for BaTiO3 without the indication of secondary phases. High-resolution transition electron microscopy images showed that BaTiO3 nanoparticles exhibit the nature of single-crystal. Magnetometry revealed that all the Co-doped BaTiO3 samples show paramagnetic behaviors and Co ions in BaTiO3 are present as isolated paramagnetic centers. This is contrasted to several reported cases of ferromagnetism in Co-doped BaTiO3. [Copyright &y& Elsevier]

A study of BaTiO3 nanoparticles doped with different transition metals including Co, Fe, and Cr is presented. X-ray diffraction and electron microscopy studies indicated that all the samples are highly crystalline and that transition metal dopants are successfully incorporated into BaTiO3 without detectable secondary phases. Raman spectra featured three characteristic broad bands centered approximately 300, 520, and 715 cm-1 from the tetragonal BaTiO3 without any extra peak present that may be attributed to other impurity phases. Temperature- and field-dependent magnetometry measurements and analysis revealed that all the samples show paramagnetic-like behavior originating from the transition metal ions. These results not only allow the exclusion of potential secondary ferromagnetic or antiferromagnetic phases, but also suggest that transition metal ions (Co, Cr, and Fe) in BaTiO3 shown in this study are present as isolated paramagnetic centers. [ABSTRACT FROM AUTHOR]

The article presents a study to analyze the geological and the aeromagnetic anomaly characteristics of Jining, Shandong Sheng, China iron ore deposit for ore prospecting. Topics include aeromagnetic anomaly caused by metamorphosed iron ore, types of iron ores including calcite-magnetite-quartzite and magnetite quartz marble and magnetic susceptibility measurements of iron ore deposit. It mentions results of aeromagnetic survey by Chinese Aero Geophysical Survey and Remote Sensing Center (AGRS).

[Display omitted] • Hybrid materials integrated with Zn 0.76 Co 0.24 S nanoparticles and Co(OH) 2 nanosheets (ZCS@CH) can have a good synergistic effect. • Hierarchically nanostructured hybrid of ZCS@CH was prepared using a simple but effective two-step hydrothermal method. • ZCS@CH electrode achieves a large specific capacity of 1152 C g−1 at 0.5 A g−1. • Hybrid supercapacitor of ZCS@CH//AC obtains an excellent energy density of 62.5 Wh kg−1 at a power density of 425.0 W kg−1. • ZCS@CH//AC shows an excellent long-term stability. It is a great challenge to achieve both high specific capacity and high energy density of supercapacitors by designing and constructing hybrid electrode materials through a simple but effective process. In this paper, we proposed a hierarchically nanostructured hybrid material combining Zn 0.76 Co 0.24 S (ZCS) nanoparticles and Co(OH) 2 (CH) nanosheets using a two-step hydrothermal synthesis strategy. Synergistic effects between ZCS nanoparticles and CH nanosheets result in efficient ion transports during the charge-discharge process, thus achieving a good electrochemical performance of the supercapacitor. The synthesized ZCS@CH hybrid exhibits a high specific capacity of 1152.0 C g-1 at a current density of 0.5 A g-1 in 2 M KOH electrolyte. Its capacity retention rate is maintained at ∼ 70.0% when the current density is changed from 1 A g-1 to 10 A g-1. A hybrid supercapacitor (HSC) assembled from ZCS@CH as the cathode and active carbon (AC) as the anode displays a capacitance of 155.7 F g-1 at 0.5 A g-1, with a remarkable cycling stability of 91.3% after 12,000cycles. Meanwhile, this HSC shows a high energy density of 62.5 Wh kg-1 at a power density of 425.0 W kg-1, proving that the developed ZCS@CH is a promising electrode material for energy storage applications. [ABSTRACT FROM AUTHOR]

Novel zero-dimensional SnO2(ZnO:Sn)m superlattice nanoparticles were synthesized by a simple method of annealing ZnO nanoparticles precoated with a sol–gel Sn–Zn–O precursor. The annealing temperature and duration were systematically evaluated, and the optimum condition was confirmed as 900 °C for 45 min to obtain ideally fully developed layered structures. Cs-corrected scanning transmission electron microscopy (STEM) revealed that the SnO2(ZnO:Sn)m was composed of alternate stacking of a Sn–O octahedral layer and Sn-doped ZnO slab, which resulted from the anisotropic diffusion of Sn atoms in the ZnO basal plane. A gas sensor based on the SnO2(ZnO:Sn)m superlattice nanoparticles exhibited a superior selectivity towards the poisonous gas of hydrogen sulphide (H2S) among six different types of gases (ethanol, H2, CO, NO2, NH3 and H2S), and an extreme low H2S detection limit of 5 ppb at the working temperature of 400 °C, which was about 3–5 orders lower than that of most ZnO-based H2S gas sensors in the literature. The drastic enhancement of the sensing properties of the SnO2(ZnO:Sn)m superlattice nanoparticles was believed to originate from its unique layered structure, which forms a microcirculation of electrons between the Sn–O atomic layers and Sn-doped ZnO slabs with different work functions, thus greatly accelerating the adsorption and desorption rate of gas molecules and increasing the sensor sensitivity. These new SnO2(ZnO:Sn)m superlattice nanoparticles were demonstrated to be a competitive H2S sensing material candidate for practical application. In addition, the facile superlattice nanoparticles fabrication method presented here could be extended to synthesize other ZnO-based superlattice material systems. [ABSTRACT FROM AUTHOR]

Abstract: Ultra-long nanowires of sodium tungsten oxide and tungsten oxide were synthesized by simply heating tungsten source under a low oxygen pressure environment. The nanowires have diameters of ~40 to 500nm and lengths from tens to several hundred microns. The majority of the nanowires were found to be triclinic Na5W14O44 with small amount of monoclinic WO3. Triclinic Na2W4O13 microplates with a rectangular shape grown together with the nanowires were also identified. The formation of ultra-long nanowires is explained by the vapor–solid (VS) growth mechanism. Effects of impurity and residue deposition have been thoroughly investigated. With a low concentration even smaller than 10ppm (parts per million), the sodium impurity in the tungsten source could result in the formation of sodium tungsten phases. The growth of nanowires could be enhanced with the presence of residue deposition and the enhancement was attributed to the production of local vapor pressure from the residue deposition. [Copyright &y& Elsevier]

[Display omitted] MnCo 2 O 4 is regarded as a good electrode material for supercapacitor due to its high specific capacity and good structural stability. However, its poor electrical conductivity limits its wide-range applications. To solve this issue, we integrated the MnCo 2 O 4 with Ni 3 S 4 , which has a good electrical conductivity, and synthesized a MnCo 2 O 4 /Ni 3 S 4 nanocomposite using a two-step hydrothermal process. Comparing with individual MnCo 2 O 4 and Ni 3 S 4 , the MnCo 2 O 4 /Ni 3 S 4 nanocomposite showed a higher specific capacity and a better cycling stability as the electrode for the supercapacitor. The specific capacity value of the MnCo 2 O 4 /Ni 3 S 4 electrode was 904.7 C g−1 at 1 A g−1 with a potential window of 0–0.55 V. A hybrid supercapacitor (HSC), assembled using MnCo 2 O 4 /Ni 3 S 4 and active carbon as the cathode and anode, respectively, showed a capacitance of 116.4 F g−1 at 1 A g−1, and a high energy density of 50.7 Wh kg−1 at 405.8 W kg−1. Long-term electrochemical stability tests showed an obvious increase of the HSC's capacitance after 5500 charge/discharge cycles, reached a maximum value of ∼162.7% of its initial value after 25,000 cycles, and then remained a stable value up to 64,000 cycles. Simultaneously, its energy density was increased to 54.2 Wh kg−1 at 380.3 W kg−1 after 64,000 cycles. [ABSTRACT FROM AUTHOR]

SnO2(ZnO:Sn)m is a new phase recently found in the diagram of a ZnO–SnO2 binary system in the form of a one-dimensional nanowire, which is a new group of superlattice oxide besides the widely known M2O3(ZnO)m (M = trivalent elements, such as In, Ga, and Al, and m = integer). Thereafter, more comprehensive structural and physical properties of SnO2(ZnO:Sn)m are still quite lacking due to the difficulties in high purity synthesis. In this study, we demonstrate a rational design for the growth of SnO2(ZnO:Sn)m superlattice nanowire arrays using a home-built double-tube chemical vapor deposition (CVD) system for the first time. The atomic microstructure of the nanowire array was investigated by Cs-corrected scanning transmission electron microscopy (STEM), and a phenomenon of unsaturated Sn occupation in Sn–O octahedral layers was observed. Two new vibrational modes at 276 cm−1 and 698 cm−1 were found in Raman measurement. The photoluminescence (PL) spectrum of SnO2(ZnO:Sn)m superlattice nanowires displays an interesting broad-spectrum emission in the range of around 380–570 nm. Kelvin probe force microscopy reveals that the average work function of SnO2(ZnO:Sn)m nanowires is in the range of 4.05–4.32 eV. [ABSTRACT FROM AUTHOR]

SnO2(ZnO:Sn)m is a recently reported new phase in the ZnO–SnO2 binary system with a naturally grown superlattice structure, which is currently only found in the form of one-dimensional nanowires. Difficulties in high-purity synthesis and orientation control have hindered further investigations into its potential unique physical properties. Here, we present a novel growth design of fabricating ZnO/SnO2(ZnO:Sn)m binary/superlattice heterojunction nanowire arrays by one-batch chemical vapor deposition to explore the rational growth mechanism of SnO2(ZnO:Sn)m superlattice nanostructures. The morphology, chemical composition and crystal structure of the as-prepared products were characterized by scanning electron microscopy, X-ray diffraction, energy-dispersive spectroscopy, X-ray photoelectron spectroscopy and Cs-corrected scanning transmission electron microscopy. It is revealed that the SnO2(ZnO:Sn)m superlattice section epitaxially grows on top of the ZnO nanowire along the [0001] direction, following the orientation relationships [1̅10]Au//[112̅0]ZnO/SnO2(ZnO:Sn)m and (111)Au//(0002)ZnO/SnO2(ZnO:Sn)m. The Au catalysts on the pre-grown ZnO nanowires play a key role in absorbing further loading of Zn/Sn vapor, inducing the formation of the SnO2(ZnO:Sn)m superlattice on the basal plane of ZnO, at the same time, avoiding the appearance of Sn-rich impurity phases. Photoluminescence measurements display a red shift of the ultraviolet (UV) emission peak from 381 nm to 386 nm and an extra peak at 470 nm, compared with the ZnO reference. This study would shed light on the rational growth of natural oxide superlattice nanowire arrays and complex axial heterojunction nanostructures. [ABSTRACT FROM AUTHOR]

The silica modified CeO 2 gas sensing nanomaterials are synthesized using a sol-hydrothermal route. The 8%silica-CeO 2 has larger specific surface areas of 83.75 m 2 /g and smaller crystalline size of 11.5 nm than pure CeO 2 , respectively. Compared to pure CeO 2 , the 8%silica-CeO 2 based gas sensor exhibits significant enhancement NH 3 gas-sensing performance. At room temperature, it shows much better gas response of 3244% to 80 ppm of NH 3 gas and lower detection limit (0.5 ppm) towards NH 3 gas. It is also found that the gas response of the NH 3 gas sensors increases linearly with the increase of NH 3 gas concentration. Moreover, the NH 3 gas sensor have good reversibility, stability and selectivity. The reason of enhanced NH 3 gas-sensing performance is not only because of the increased specific surface areas, but also due to the electrolytic conductivity of NH 4 + and OH − on the surface. [ABSTRACT FROM AUTHOR]

Due to their outstanding electrochemical properties, transition metal sulfides and hydroxides are often used as high-performance electrode materials for supercapacitors. The Mn-doped Co(OH) 2 /Ni 3 S 4 electrode material in this study, due to the synergistic reaction mechanism among Co(OH) 2 and Ni 3 S 4 and the increased active sites by the addition of Mn, the Mn-Co(OH) 2 /Ni 3 S 4 exhibits excellent electrochemical property. The electrochemical performance of the Mn-Co(OH) 2 /Ni 3 S 4 hybrid electrode was measured in an electrode cell made of 2 M KOH solution, showing a superior specific capacitance of 1107.0 C g−1 at 0.5 A g−1, in addition to the excellent capacity retention rate at 10 A g−1 is 72.7 % of that at 1 A g−1. The performance of the hybrid supercapacitor (HSC) assembled with Mn-Co(OH) 2 /Ni 3 S 4 compound and activated carbon (AC) was measured under the same electrolyte conditions, anwell-specificific capacity (157.2 F g−1 at 0.5 A g−1) was achieved, along with superior long-term stable charge/discharge capability (88.9 % of the original specific capacity after 35,000 cycles at 8 A g−1). Meanwhile, the most practical application is when the power density of 410.4 W kg−1, the assembled HSC device has an energy storage capacity of 58.8 W h kg−1, revealing that the developed Mn-Co(OH) 2 /Ni 3 S 4 has great application potential for supercapacitors in the future. [Display omitted] • Mn-Co(OH) 2 /Ni 3 S 4 was synthesized via co-precipitation, and hydrothermal processes. • Mn-Co(OH) 2 /Ni 3 S 4 electrode achieves a large specific capacity of 1107 C g−1 at 0.5 A g−1. • The specific capacity maintains 72.7 % when the current density is changed from 1 A g−1 to 10 A g−1. • Mn-Co(OH) 2 /Ni 3 S 4 //AC HSC obtains an energy density of 58.8 Wh kg−1 at a power density of 410.4 W kg−1. • The capacitance of the Mn-Co(OH) 2 /Ni 3 S 4 //AC maintains ∼89.0 % after 35,000 cycles. [ABSTRACT FROM AUTHOR]

[Display omitted] • Estabalish a "quantitative data + machine learning + expert experience" MPM workflow. • SA-BPNN was introduced for MPM, and achieved superior performance. • Identify 5 target areas of Cu (Au) deposits in the Duolong district, Tibet. Machine learning (ML) is emerging as a highly effective technique for mineral exploration. However, mineral exploration poses several unique challenges to ML application, such as uncertain geological information in remote regions and imbalanced labeled training data. In this study, we developed a deep-learning framework — a self-attention back-propagation neural network (SA-BPNN) — which is used to automatically explore relationships among diverse features and improve the capability of information extraction. Moreover, we proposed a mineral prospectivity modeling workflow involving "quantitative data + ML + expert experience" for porphyry-epithermal deposits. Using quantitative data obtained from hyperspectral remote sensing, geochemistry, and geophysics, we predicted ore-prospecting targets by applying the SVM, SA-BPNN, and U-Net models. Thereafter, we combined the model-based prediction with geological data to delineate the target areas. The model-based prediction by SVM, SA-BPNN, and U-Net occupy 1.73%, 1.40%, and 2.21% of the study area and contain 100%, 100%, and 80% of the known Cu-Au mineralization in the Duolong ore district in Tibet, respectively. The proposed SA-BPNN method, thus, achieved superior performance for mineral prospectivity modeling compared with alternative methods. [ABSTRACT FROM AUTHOR]

The article focuses on a research paper on the compound orogeny process of late Paleozoic-Mesozoic Tethyan tectonic evolution and Cenozoic collisional orogeny and its constraints on metallogenesis in Sanjiang region in Southwest China. Topics discussed include the evolution of the Tethyan orogenic belt of Sanjiang, regional geology and different mineralizations restricted by compound orogeny processes with different time and space scales.

[Display omitted] • 3DOM Fe based FTS catalyst was developed by a Nitrate Oxidation-PMMA templating technique. • C 5 + selectivity was 70.44% when the 3DOM FT catalyst used in the simulated biosygas. • The CO conversion rate was 68.23% when the 3DOM FT catalyst used in the simulated biosygas. • CO 2 and CH 4 selectivity was 12–26% and 2.67–5.5%. Three-Dimensionally Ordered Macro-porous (3DOM) Fe based catalysts were synthesized via a facile "glyoxylate route" poly (methyl methacrylate) (PMMA) colloidal crystal template (CCT) method. Fischer Tropsch Synthesis (FT) using different biosyngasses over the 3DOM Fe based catalyst for producing the liquid hydrocarbon was studied. The morphology, structure and microstructures of 3DOM Fe based catalysts were characterized by SEM, BET, TPR, HRTEM, XRD, XPS and DRIFTS. The experimental results demonstrated that the hydrogen lean syngas decreased the partial pressure of H 2 /CO, which caused the decrease of the CO conversion rate during FT reaction. Moreover, the addition of CO 2 and CH 4 in the hydrogen lean syngas could well preserve the iron carbide phase in the catalyst, and the CO conversion rate was improved. Lower H 2 /CO ratio syngas would shift the liquid hydrocarbon distribution to higher molecular weight hydrocarbons, and the addition of CO 2 and CH 4 into the syngas further facilitated the shift. Meanwhile, it was also found that the CO conversion rate and C5+ selectivity were 68.23% and 70.44% respectively during the simulated biosyngas from biomass gasification (the hydrogen lean syngas contained CO 2 and CH 4) FT over the 3DOM Fe based catalyst, and CO 2 and CH 4 selectivity were 12–26% and 2.67–5.5% respectively. [ABSTRACT FROM AUTHOR]

[Display omitted] • The Ni-Mg-Al catalyst was prepared via a co-precipitation method and it was evaluated in the biogas reforming of CO 2 for syngas. • The effect of Mg molar content on the catalyst structure and catalytic performance was discussed. • The NM 10 A sample with 10 mol% Mg possessed the most basic sites over the catalyst surface. • The NM 10 A catalyst displayed the best catalytic activity and the minimum carbon deposition. In this work, a series of Ni-Mg-Al catalysts with different Mg molar contents were prepared via a co-precipitation method. These catalysts were used for the biogas reforming of carbon dioxide (BRCD) for syngas production. The influence of Mg molar contents on the catalyst structure and catalytic performance was investigated. During the 60 h stability test at 750 °C, all of the Mg-promoted catalysts presented a higher catalytic activity and better stability in comparison with the catalyst without Mg loading. The NM 10 A sample with 10 mol% Mg loading displayed the highest CH 4 and CO 2 conversion of 86.9% and 90.8%, respectively. The catalysts were characterized by N 2 adsorption-desorption analysis, XRD, H 2 -TPR, CO 2 -TPD, TEM and TGA techniques. It was found that the addition of Mg inhibited the sintering of Ni particle and increased the catalyst basicity. Consequently this suppressed the coke deposition and improved the catalytic activity. The NM 10 A catalyst possessed the most basic sites, which caused a minimum amount carbon to be deposited on the catalyst and allowed for the best catalytic activity. The obvious increase of the Ni metal size and the severe coke deposition resulted in the deactivation of the NM 0 A catalyst. [ABSTRACT FROM AUTHOR]

Olefins are extensively used in the chemical industry as building blocks for manufacturing a wide range of products such as polymers, drugs, cosmetics, solvents, and detergents. Traditionally, olefins have been produced from thermal or catalytic cracking of petroleum-derived hydrocarbons, but environmental and economic concerns are urging exploration of alternative routes for their production from renewable sources. Herein, we report the synthesis of olefin-rich liquid hydrocarbons from biomass-derived syngas (biosyngas) via Fischer–Tropsch reaction by using carbon-encapsulated iron carbide/iron nanoparticles (CEICINs) catalysts. The CEICINs core-shell nanostructured catalysts typically constituted iron carbide/iron-core diameters of 6–30 nm and graphite-shell thickness of 2–5 nm, where the iron carbide/iron-core consisted of α-Fe, θ-Fe 3 C and Fe 15.1 C. The catalytic performance over CEICINs at mild reaction conditions (310 °C, 1000 psig, 3000 h −1 ) showed that CO and H 2 conversion was ∼87.5% and 85%, respectively. The C 5+ liquid hydrocarbon selectivity was ∼65%, ∼44.8% of which was olefins. The liquid product formation rate was 0.12 g/(g cat h) during the time-on-stream of 100 h after achieving steady state. The volume percent of the oil phase in the liquid product was ∼60%. The higher reaction temperature led to the higher selectivity towards olefins, while the effect of biosyngas pressure was not a significant factor concerning olefin selectivity. Gas hourly space velocity (GHSV) had a negative effect on the formation of olefins due to the short-time contact of the reactant gas with the CEICINs catalyst. This work demonstrated the technical feasibility of the direct synthesis of olefin-rich liquid hydrocarbons by utilizing CEICINs catalysts from biosyngas via biomass gasification, biosyngas cleaning, and Fischer–Tropsch synthesis technology. [ABSTRACT FROM AUTHOR]

Abstract: The Anshan area in Liaoning province, Northeast China is famous for the richest banded iron formation (BIF) sources in the country. Whether they belong to volcano-sedimentary formation (Algoma-type) or sedimentary formation (Superior-type) remains controversial. Here we apply an interactive inversion technique on profile of gravity and magnetic anomalies to study the deep geological structure of the Anshan area. Combined with previous petrological and sedimentological studies on these rocks, the inversion results indicate that both Donganshan and Qidashan iron deposits consist of several syncline-shaped iron ore bodies. Among these, the majority might be considered as part of Archean and Paleoproterozoic Superior-type mineralization, whereas Algoma-type mineralization has been recognized only in the intervals during the volcanic eruption. Exploration for deep-seated iron deposits outside the Anshan area has led to the discovery of large amount of iron ores. Although the large aeromagnetic anomaly could be the signal of the buried huge iron ore bodies at depth in Anshan area, this has not been confirmed by deep drilling exploration. In order to solve this puzzle, we computed the aeromagnetic and gravity anomalies along a profile in the proven iron deposit of the Donganshan–Qidashan district. The results reveal marked contrast between the calculated and observed anomalies. Based on these results and previous studies on the metallogenic features, we predict the presence of large iron ore bodies at depth beneath the Anshan area. [Copyright &y& Elsevier]

• Flower-like Zn doped Ni(OH) 2 @CNTs (ZNC) was in-situ synthesized by a colloidal method at room temperature. • ZNC shows a high specific capacity of 726.5 C g-1 at 1 A g-1 and maintains 72.9% at 10 A g-1. • The energy density of ZNC//AC hybrid supercapacitor (HSC) is 51.3 Wh kg-1 at the power density of 409.6 W kg-1. • After 50,000 cycles, the energy density of ZNC//AC HSC maintains 29.33 Wh kg-1 at 16.5 kW kg-1. • After 50,000 cycles, the capacity of the HSC becomes 115.8% of its initial value. Transition metal oxides and hydroxides are typically applied as electrode materials for supercapacitors, but it is often difficult to achieve both their high power density and energy density simultaneously. Herein, electrodes of flower-like Zn doped Ni(OH) 2 combined with carbon nanotubes (i.e., Zn doped Ni(OH) 2 @CNTs) were in-situ synthesized using a colloidal synthesis method at room-temperature, assisted by cetyltrimethyl ammonium bromide (CTAB) and NaBH 4. This electrode exhibits an excellent electrochemical performance, achieving a high specific capacity of 750.5 C g-1 at 0.5 A g-1 and maintaining 72.9% of its initial value when the current density is increased from 1 A g-1 to 10 A g-1. A hybrid supercapacitor (HSC) assembled using the Zn doped Ni(OH) 2 @CNTs as the positive electrode and an active carbon as the negative electrode exhibits a capacity of 201.7 C g−1 at 1 A g-1 and an energy density of 51.3 Wh kg-1 at a power density of 409.6 W kg-1. After running for 50,000 cycles at a current density of 6 A g-1, the capacity of the HSC becomes 115.8% of its initial value. Moreover, this HSC maintains a high energy density of 29.33 Wh kg-1 at a high power density of 16.5 kW kg-1 after cycling for 50,000 times, which indicates its suitability for energy storage applications. [Display omitted] [ABSTRACT FROM AUTHOR]

CuCo 2 O 4 nanoparticles were synthesized using a facile co-precipitation method, and they showed. 1 large surface area and high porosity. 2 CuCo 2 O 4 electrodes exhibited both battery-type and capacitive-type behavior. 3 high specific capacity and good rate capability. 4 CuCo 2 O 4 –250//AC asymmetric supercapacitor showed good electrochemical performance. Ultra-fine CuCo 2 O 4 nanoparticles were synthesized using a facile co-precipitation method assisted by NaBH 4 and CTAB, and they were explored as supercapacitor electrode material to achieve a large specific capacity and a high rate capability. The synthesized CuCo 2 O 4 –250 nanoparticles had a large surface area of 159.6 m2 g −1, which provided numerous active sites to enhance their specific capacity. The abundant mesopores with a pore volume of 0.3599 cm3 g −1 effectively provided numerous channels for the electrolyte ions to diffuse onto the active surface of nanoparticles. The CuCo 2 O 4 –250 nanoparticles based electrodes exhibited both battery-type and capacitive-type behavior in the charging/discharging processes. It achieved a large specific capacity of 401.2 C g −1 at a current density of 0.5 A g −1 in 2 M KOH electrolyte. Results showed that when the current density was increased from 1 A g −1 to 10 A g −1, a retained specific capacity of 77.5% was achieved, indicating a good rate capability. An asymmetric supercapacitor with CuCo 2 O 4 –250 nanoparticles and activated carbon as positive and negative electrodes exhibited a high energy density of 29.5 Wh kg−1 at a power density of 832.6 W kg−1 and a capacity retention of 72.7% at 10 A g −1 after 10,000 cycles. [Display omitted] [ABSTRACT FROM AUTHOR]

Correction for ‘In situ growth of ZnO/SnO2(ZnO:Sn)m binary/superlattice heterojunction nanowire arrays’ by Song Jiang et al., CrystEngComm, 2018, 20, 556–562. [ABSTRACT FROM AUTHOR]

The article offers information on the research "Characteristics of Ore-forming Fluid in the Baoxingchang Porphyry Cu-Mo-Au Deposit, Western Yunnan, China" by Sun Nuo and colleagues. Topics discussed include characteristics of mineralized veins, systematic microthermometric studies on fluid inclusions of quartz, and salinity and temperature characteristics of the ore genesis.