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Perfluorooctanoic acid "Forever Chemical" presents substantial ecological challenges owing to its persistence and resistance to degradation. The study introduces a novel approach by integrating ternary metal oxides—Gd 2 O 3 , Co 3 O 4 , and Bi 2 O 3 with carbon nanotubes to develop a versatile electrode material, CNT@GdCoBi NCs, which demonstrates dual functionality as both an electrochemical sensor for PFOA and a component for energy storage devices. The electrode exhibits outstanding electrochemical sensing performance, with a detection limit for PFOA of 4.9 ppb. Interference tests reveal the electrode's high selectivity for PFOA, with a tolerance limit of ≤ 5 %. Practical application on various fruits, vegetables, and water samples shows an average relative standard deviation (%RSD) between 4.8 % and 5.6 %, underscoring the practical effectiveness of the CNT@GdCoBi NCs electrode. Furthermore, the CNT@GdCoBi NCs exhibit remarkable supercapacitor performance, achieving a specific capacitance of 1197 F/g at 2 A/g, which is 1.5 times higher than that of GdCoBi NCs. At a current density of 2 A/g, the symmetric supercapacitor device demonstrates a specific capacitance of 269 F/g, along with a high energy density of 52 Wh/kg at a power density of 500 W/kg. Additionally, the CNT@GdCoBi NCs electrode maintains good durability, retaining 94 % of its capacitance after 10,000 cycles. [Display omitted] • CNT@GdCoBi NCs was used for PFOA electrochemical sensing and supercapacitor device. • CNT@GdCoBi NCs shows excellent PFOA detection of 4.886 ppb with outstanding selectivity. • Real-world testing on wastewater, food and water samples proves sensor reliability. • CNT@GdCoBi-based device achieves 52.26 Wh/kg energy and 500 W/kg power density. [ABSTRACT FROM AUTHOR]

[Display omitted] • The waste-to-wealth strategy is to use spent adsorbents to develop a supercapacitor device. • RGO-Au-Ag 2 O/PIn NCs excel in Sb(III) adsorption, combating water pollution. • RGO-Au-Ag 2 O/PIn NCs achieve 90 % removal at 60 mg/L Sb(III). • Sb-enriched waste adsorbent based symmetric supercapacitor device showed an energy density of 40.66 Wh/kg. A novel strategy for addressing industrial wastewater and energy storage issues has been introduced by constructing a symmetric supercapacitor device using the adsorption of antimony (Sb(III)) from wastewater, facilitated by RGO-Au-Ag 2 O/PIn NCs heralding a new era of efficiency and sustainability. The room temperature mediated synthesis of RGO-Au-Ag2O/PIn NCs demonstrates exceptional efficacy in Sb(III) removal. Moreover, we developed a sustainable approach by repurposing spent Sb(III) adsorbed RGO-Au-Ag2O/PIn NCs for energy storage, thereby reducing secondary pollution. The RGO-Au-Ag2O/PIn NCs presented the maximum removal efficiency of ∼ 90 % at 60 mg/L of initial Sb(III) concentration at pH 8 and 15 mg/25 mL. Experimental adsorption data of Sb(III) onto the RGO-Au-Ag2O/PIn NCs was well fitted with pseudo-second-order kinetic model and Langmuir adsorption isotherm model. Subsequently, the Sb-enriched waste adsorbent (RGO-Au-Ag2O/PIn@SbOx) was utilized to develop a symmetric supercapacitor device, which displayed an energy density of 40.66 Wh/kg alongside a power density of 1000 W/kg. Importantly, this device maintained 82 % capacitance retention even after 12,000 cycles. This research provides an effective method for repurposing exhausted adsorbents, potentially improving energy-efficient recycling of hazardous solid residues in an economical and environmentally friendly way. [ABSTRACT FROM AUTHOR]

Currently, the recycling of spent adsorbents stands as a significant concern, primarily due to the inherent value of these resources. Opting to repurpose these materials in the realm of energy storage not only alleviates environmental pressures but also offers a compelling alternative for combating the energy crisis. This multifaceted approach not only contributes to environmental sustainability but also yields invaluable electrode materials, thereby delivering comprehensive economic benefits. In this study, a novel fCNT-Sm/Co-LDH was synthesized via hydrothermal route which efficiently adsorbed antimony (Sb(III)) from wastewater. The expended adsorbent was reused for energy storage, mitigating secondary pollution. The fCNT-Sm/Co-LDH presented the maximum removal efficiency of 96 % at 10 mg/L of initial concentration of Sb(III) at pH 8. The Sb-enriched waste adsorbent (fCNT-Sm/Co-LDH@SbO x) was further employed as an energy storage device and demonstrated outstanding performance. The electrochemical examination unveiled that the fCNT-Sm/Co-LDH@SbO x showcased the most substantial specific capacitances, reaching 850 F/g at 2 A/g. The fabricated fCNT-Sm/Co-LDH@SbO x -based symmetric supercapacitor device displayed 78 Wh/kg of energy density at 833 W/kg of power density while unveiling capacitance retention of 92 % after 10,000 cycles. This research presents an efficient method for recycling used adsorbents, which can be extended to enhance eco-friendly and cost-effective reprocessing of other hazardous solid wastes, particularly for energy storage applications. [Display omitted] • Repurposing spent adsorbents mitigates environmental impact and addresses the energy crisis. • A hydrothermal route yields a high-performing fCNT-Sm/Co-LDH adsorbent for antimony removal. • The Sb-enriched waste adsorbent proves exceptional as a supercapacitor, reaching 850 F/g. • The study proposes a sustainable method for recycling adsorbents, offering economic and environmental benefits. [ABSTRACT FROM AUTHOR]

Nowadays, developing a simple, economical, and scalable approach for producing energy storage and harvesting devices remains challenging. Herein, we developed a mesoporous RGO-SiO 2 -TiO 2 nanocomposite for the electroreduction of carbon dioxide through microbial electrosynthesis and high-performance supercapacitor device. An electrode containing Si/Ti oxide nanoparticles and a layer of RGO coated on carbon felt containing RGO-SiO 2 -TiO 2 NCs demonstrated stable photocurrents 2.1 times higher than a bare carbon felt electrode and acetate production of 3.21 mM/d with a coulombic Efficiency of acetate 78% and a current density 2.7 A/m2, which was metabolized into acetate from HCO 3 - by cultivated anaerobic bacteria. The RGO-SiO 2 -TiO 2 NCs-based supercapacitor achieved a maximum energy density of 35 Wh/kg at 630 W/kg power density, and after 10,000 cycles, it retained 84% capacitance stability at 10 A/g with 180 F/g at 1.25 A/g. This method presents a straightforward, cost-effective approach for mitigating CO 2 emissions and generating energy harvesting devices. [Display omitted] • RGO-TiO 2 -SiO 2 NCs offer the innovative potential for the energy and environmental crisis. • Photo-generated electrons accelerate transport rate and increase CO 2 reduction. • Higher currents boost acetate production to 3.21 mM/d with 78% coulombic efficiency. • Device shows excellent cycle stability: 86% capacitance retained after 10,000 cycles. [ABSTRACT FROM AUTHOR]

A sustainable and scalable technique was developed to synthesize RGO-TiAg nanocomposites at room temperature, utilizing Lactobacillus sp. as an environmentally friendly reducing and stabilizing agent. This approach offers a cost-effective solution for large-scale production. The unique properties of Lactobacillus sp. allow for the reduction of metal ions while inhibiting agglomeration and preserving the stability of the resulting nanocomposites. The addition of reduced graphene oxide (RGO) sheets to the TiAg-based electrode increases its specific surface area, thereby enhancing the electrode's charge-storage capacity by promoting the formation of conductive networks. Furthermore, the hydrophilic oxygen groups of chemically reduced graphene oxide in the RGO-TiAg nanocomposites facilitate the electrolyte's access to the electrode's pores. Electrochemical analysis revealed that the RGO-TiAg NCs demonstrated the highest specific capacitances of 816.92 F/g at 1.5 A/g. An asymmetric supercapacitor device was fabricated by utilizing a composite electrode composed of RGO-TiAg NCs and activated carbon (AC). Polyvinyl alcohol-Na2SO4 (PVA-Na2SO4) was employed as the electrolyte and electrode separator. The RGO-TiAg NCs//ACarbon assisted ASC supercapacitor device demonstrated a specific capacitance of 256 F/g at 4 A/g, along with tremendous energy and power densities of 53.33 Wh kg− 1 and 2 kW kg− 1, respectively, at the same current density. The device exhibited a high-power density of 6 kW kg− 1 and an energy density of 25 Wh kg− 1, with a capacitance retention of 82% even at an ultrahigh current density of 12 A/g, after 10,000 cycles. Additionally, this work illustrates an effective method for synthesizing nanocomposites that may be used for developing prospective, high-performance supercapacitors for energy storage. [Display omitted] • Eco-friendly synthesis of RGO-TiAg NCs using Lactobacillus sp. • RGO-TiAg NCs-based devices demonstrate high specific capacitances of 256 F/g at 4 A/g. • It demonstrates excellent cyclic stability and capacitance retention after 10,000 cycles. • It showed remarkable energy/power densities (53.33 Wh kg−1 and 2 kW kg−1). [ABSTRACT FROM AUTHOR]

NiO–CuO decorated Polyaniline (PANI/ NiO–CuO) nanocomposite based symmetric supercapacitor device for High-Energy Density performance. [Display omitted] • We have fabricated symmetrical supercapacitor device utilizing PANI/ NiO–CuO nanocomposite. • At a voltage of 1.6 V, the measured specific capacitance was 157.50 F/g. • PANI/ NiO–CuO exhibits 69% capacity retention after 10,000 cycles. • The High energy density of 35.00 Wh/kg and power density of 1326.31 W/kg. We present a ternary nanocomposite material composed of polyaniline, nickel oxide, and copper oxide (PANI/ NiO–CuO NC) synthesized through a cost-effective, eco-friendly green soft template for high-performance supercapacitor applications. The specific capacitance was measured to be 490 F/g when scanned at a rate of 10 mV/s in a wide voltage range of −1.0 V to +1.0 V. The material demonstrated good capacity retention of 69% after 10,000 cycles using an aqueous electrolyte (0.1 M Na 2 SO 4) under ambient conditions. This material overcomes the limitations of the parent materials, specifically the instability of polyaniline polymer chains and hindered charge mobility in nickel oxide. Additionally, the fabricated symmetric supercapacitor device made of the synthesized PANI/ NiO–CuO nanocomposite showed a capability to work within a 1.6 V voltage range and had a specific capacitance of 157.50 F/g at a current density of 3.5 A/g. The device also displayed a high energy density of 35.00 Wh/kg at a power density of 1326.31 W/kg and had good durability with 86 % retention of specific capacitance after 10,000 charge–discharge cycles. Moreover, this study demonstrated an effective synthesis approach in developing nanocomposites; It can be used as an excellent nanocomposite device for energy storage. [ABSTRACT FROM AUTHOR]

• Ni(OH) 2 -Co 3 S 4 NCs exhibited potential for structural supercapacitor. • Ni(OH) 2 -Co 3 S 4 NCs based structural supercapacitor fabricated using VARTM. • Device achieved 74.30 Wh/kg energy and 500 W/kg power density. • Excellent cycle stability: 48% capacitance retained after 100,000 cycles. Herein, we synthesized Ni(OH) 2 -Co 3 S 4 nanocomposite through facile hydrothermal synthesis, where Ni(OH) 2 NPs interact synergistically with Co 3 S 4 layers. Remarkably, the interaction of Co 3 S 4 NPs influenced the Ni-O bond interface, and synergistic impact stimulated the development of defects and ultimately improved the characteristics of the Ni(OH) 2 -Co 3 S 4 NCs. The results indicate that at a current density of 2 A/g, the specific capacitance of Ni(OH) 2 -Co 3 S 4 nanocomposites using a three-electrode system was twice that of Co 3 S 4 nanoparticles and three times that of Ni(OH) 2 nanoparticles, measuring 1187.05 F/g, 573.33 F/g, and 435.20 F/g, respectively. Similarly, Ni(OH) 2 -Co 3 S 4 NCs electrodes retained the capacitance over 10,000 cycles with 92% stability. Further practical applicability was demonstrated by growing NCs on woven carbon fiber, and the structured supercapacitor device was fabricated using the VARTM technique, yielding a specific capacitance of 0.92 F/cm2 at 0.20 A/cm2. This device exhibited a maximum energy density of 74.30 Wh/kg at a power density of 500 W/kg and maintained excellent cycle stability for up to 100,000 cycles, retaining 48% of its initial capacitance. These outcomes emphasize the significance of interfacial nanoengineering and give essential information for building energy storage devices for the future. [ABSTRACT FROM AUTHOR]

In the present technological era, energy storage devices like batteries and supercapacitors hold immense importance, and their hybrid variants have gained notable interest. The aim of this study was to develop a dual-linker MOF capable of selectively capturing cobalt and vanadium ions using two distinct organic ligands. The ultrasonication-assisted hydrothermal technique was demonstrated to be a resounding success in achieving the synthesis of the bimetallic and dual-linker metal-organic framework (MOF). The outcome of the electrochemical analysis demonstrated that the Co-V-capacitance MOF contributes to the battery-type process by diffusion control at 88.52 %, while 11.48 % of the process is capacitive-controlled, in an aqueous electrolyte (1 M KOH). Additionally, the upgraded Co-V-MOF electrode displayed an impressive specific capacity of 1711.1 F/g. The utilization of Co-V-MOF in the hybrid Asymmetric supercapacitor resulted in an outstanding specific capacitance of 187.5 F/g, with energy and power densities of 70.65 Wh/kg and 835 W/kg, respectively. It is important to mention that the Co-V-MOF hybrid supercapacitor exhibited excellent and consistent performance for 10,000 cycles (92.21 %). The outstanding specific capacitance performances produced in this study represent the most significant findings reported to date for bi-metallic and dual-linker MOFs based on vanadium-cobalt. [Display omitted] • CoV-Trimesic-H3IMDC MOF nanoarchitecture synthesized via the Sono-Hydrothermal method. • A MOF structure with corrugated layers facilitates electrolyte diffusion and storage. • It shows excellent cycling durability (92.1 % retention rate) and high specific capacity (1635.6 F/g). • The asymmetric device exhibited outstanding energy density (70.65 Wh/kg) and power density (835 W/kg). [ABSTRACT FROM AUTHOR]

To develop innovative energy-storage devices, metal-organic frameworks (MOFs) with various nano-geometries must be rationally combined. In this research, a trimetallic-based MOF with varying ratios of carbon nanotubes (CNT) was synthesized and optimized for use in electrochemical supercapacitor devices. The composite material has a corrugated-layered structure that allows for fast ion transport and electrolyte storage. The synergistic features of CNT and MOF, along with the stronger redox reactions of multimetallic ionic species, enable effective charge storage. The 1D nanotube form of CNT provides stability and electrical conductivity. MOF-CNT(5 %) showed a higher capacitive efficiency than MOF due to its high specific capacitance and rate capacity (86.1 % retention at 5 A/g). The MOF-CNT(5 %)//ACarbon composite exhibited a capacitance of 166.4 F/g at 1 A/g, 79.2 % retention after 10,000 charging/discharging cycles, a high-power density of 501.5 W/kg, and an energy density of 23.6 Wh/kg, making it a potential nanomaterial for asymmetric supercapacitors. Dunn's and Trasatti's model were used to extract regression parameters and capacitive-diffusive contributions of the supercapacitor. [Display omitted] • MOF-CNT(5 %) composites are electrochemically stable with excellent cycling durability. • The MOF-CNT(5 %) //AC hybrid supercapacitor demonstrates a high power density of 501.5 W/kg and an energy density of 23.6 Wh/kg. • Potential applications of the MOF-CNT supercapacitor in areas such as renewable energy storage, electric vehicles, and portable electronics. [ABSTRACT FROM AUTHOR]