01831nas a2200265 4500008004100000022001400041245012300055210006900178260000900247300001100256490000800267520095300275653001501228653002201243653002601265653001901291653002201310100001901332700001901351700001801370700001601388700001801404700001801422856012501440 2021 eng d a0169-433200aBimetallic ZnFe2O4 nanosheets prepared via electrodeposition as binder-free high-performance supercapacitor electrodes0 aBimetallic ZnFe2O4 nanosheets prepared via electrodeposition as  cSEP  a1499510 v5593 a

Binder-free bimetallic ZnFe2O4 nanosheets were fabricated using one-step electrodeposition, which facilitated excellent electrical contact between the ZnFe2O4 nanosheets and the nickel substrate. The resultant numerous ZnFe2O4 nanosheets with their cubic spinel structures promote interfacial activity to enhance the electrochemical and Faradaic redox reactions. The metallic Zn and Fe from the cubic spinel structure of ZnFe2O4 attract electrolytic ions and increase the energy-storage capability, thus yielding a specific capacitance of 1093 F.g(-1) at a current rate of 1 A.g(-1). Different samples were prepared by varying the amount of metal salts in the electrodeposition solution while maintaining a constant ZnNt:FeSO4 concentration ratio of 1:2 for all cases. The optimal electrode composition, which yielded an energy density of 54 Wh.kg(-1) and a capacitance retention of 93.5% at N = 5000 charge-discharge cycles, was identified.

10aBimetallic10aElectrodeposition10aEnergy storage device10asupercapacitor10aZnFe2O4 nanosheet1 aJoshi, Bhavana1 aSamuel, Edmund1 aPark, Chanwoo1 aKim, Yongil1 aLee, Hae-Seok1 aYoon, Sam, S. uhttps://library.ncl.res.in/content/bimetallic-znfe2o4-nanosheets-prepared-electrodeposition-binder-free-high-performance01788nas a2200277 4500008004100000022001400041245012300055210006900178260001000247300001100257490000800268520085600276653001801132653002001150653002901170653002901199100001901228700001901247700001601266700001801282700001901300700002301319700001801342700001801360856013201378 2021 eng d a0169-433200aCotton fabric decorated with manganese oxide nanorods as a supercapacitive flexible electrode for wearable electronics0 aCotton fabric decorated with manganese oxide nanorods as a super cDEC 1 a1509680 v5683 aWe present the fabrication (using a hydrothermal process) and the properties of wearable fabrics decorated with ultrathin manganese oxide (MnO2) nanorods for supercapacitor applications. The superior mechanical durability of the supercapacitor was confirmed by cyclic voltammetry (CV) curves, which showed little change during 1000 bending cycles. The pseudocapacitive properties of the ultrathin MnO2 nanorods were confirmed by recording the CV curves at various scan rates. The galvanostatic charge-discharge curves at various specific currents confirmed the pseudocapacitance of MnO2. The ultrathin MnO2 nanorods exhibited a superior capacitance of 508 F.g(-1) and an energy density of 35.3 Wh.kg(-1). The MnO2 electrode with optimal properties demonstrated stable long-term cycling performance with 90% retention after 10,000 galvanostatic cycles.10aCotton fabric10aManganese oxide10aUltrafine nanostructures10aWearable supercapacitors1 aSamuel, Edmund1 aJoshi, Bhavana1 aKim, Yongil1 aPark, Chanwoo1 aAldalbahi, Ali1 aEl-Newehy, Mohamed1 aLee, Hae-Seok1 aYoon, Sam, S. uhttps://library.ncl.res.in/content/cotton-fabric-decorated-manganese-oxide-nanorods-supercapacitive-flexible-electrode-wearable11115nas a2200193 45000080041000002450121000412100069001622600009002313000011002404900008002515201043200259100001610691700001910707700001910726700001810745700001810763700001810781856012210799 2021 eng d00aFlexible metallized carbon nanofibers decorated with two-dimensional NiGa2S4 nanosheets as supercapacitor electrodes0 aFlexible metallized carbon nanofibers decorated with twodimensio cSEP  a1304970 v4203 a

Herein, high-power flexible supercapacitor electrodes were fabricated by decorating Ni-electroplated carbon nanofibers (Ni@CNF) with two-dimensional NiGa2S4 nanosheets. The electrical conductivity of carbon nanofibers was enhanced by the addition of nickel, and the energy storage capability was enhanced by decoration with NiGa2S4. The impact of metal (Ni/Ga) ratio on the overall electrochemical performance of the supercapacitor was studied by varying the Ga concentration. The NiGa2S4 nanosheets promoted diffusion of the electrolyte into the electrode, thereby improving the electrochemical activity. The nanosheets also intensified the charge transfer rate within the composite electrode, which contributed to the overall improvement in the electrochemical performance. The optimal Ga concentration was the concentration at which the specific capacitance was the highest at 488 F·g−1 with a potential window of 1.1 V and current rate of 0.5 A·g−1. The long-term stability test revealed that the capacitance retention of the electrode with this optimal Ni/Ga ratio was 109% after 20,000 cycles. This flexible supercapacitor electrode was subjected to 2000 bending cycles, and the corresponding cyclic voltammetry performance was assessed. In combination, the outstanding electrochemical performance and durable mechanical properties render the NiGa2S4/Ni@CNF electrode highly suitable for flexible energy storage applications.

1 aKim, Yongil1 aSamuel, Edmund1 aJoshi, Bhavana1 aPark, Chanwoo1 aLee, Hae-Seok1 aYoon, Sam, S. uhttps://library.ncl.res.in/content/flexible-metallized-carbon-nanofibers-decorated-two-dimensional-niga2s4-nanosheets02851nas a2200277 4500008004100000022001400041245009800055210006900153260000800222300001400230490000700244520195500251653002002206653001802226653002502244653002802269653001902297100001902316700001902335700001802354700001902372700002302391700001802414700001802432856012302450 2022 eng d a0363-907X00aWearable fabric supercapacitors based on CNTs and polyhedral ZnO with a wide potential window0 aWearable fabric supercapacitors based on CNTs and polyhedral ZnO cMAY a8186-82000 v463 a

Wearable electronic devices such as health monitors, sensors, and e-skin can be powered by lightweight, high-power supercapacitors. Using a binder-free and low-temperature hydrothermal method, polyhedral ZnO nanoparticles were grown on carbon nanotube (CNT)-decorated cotton fabric, which is friendly to human skin and highly wearable, inexpensive, and thus commercially viable. The concentration of the starting material, zinc acetate, was varied to optimize the electrochemical performance. The evenly spaced polyhedral ZnO facilitated efficient permeation of the electrolyte into the active material. The fabric filaments were decorated with CNTs to enhance electron transfer and the overall electrochemical processes. The symmetric cell comprised of cotton fabric decorated with ZnO polyhedron/CNT showed no discernible change in the cyclic voltammetry curves even after 500 bending cycles, demonstrating the mechanical durability of the electrode. The potential window of 1.6 V using a Na2SO4/K2SO4 aqueous dual-ion electrolyte improved the long-term electrochemical stability and increased the energy storage capacity. The capacitance retention was 94% after 5000 cycles at a current density of 1 A center dot g(-1), indicating long-term electrochemical stability. A specific capacitance of 375 F center dot g(-1) at a current density of 5 A center dot g(-1) and energy density of 33.3 Wh center dot kg(-1) at a power density of 2000 W center dot kg(-1) were recorded for the optimized electrode. Highlights Polyhedral ZnO was grown on cotton fabric using a hydrothermal process. The electrochemical performance was optimized by varying the zinc acetate concentration. The highest specific capacitance was 375 F center dot g(-1) at a current density of 5 A center dot g(-1). Under optimal conditions, the capacitance retention was 94% at N = 5000 cycles. The energy density of the electrode was as high as 33.3 Wh center dot kg(-1).

10acarbon nanotube10aCotton fabric10ahydrothermal process10awearable supercapacitor10aZnO polyhedron1 aSamuel, Edmund1 aJoshi, Bhavana1 aPark, Chanwoo1 aAldalbahi, Ali1 aEl-Newehy, Mohamed1 aLee, Hae-Seok1 aYoon, Sam, S. uhttps://library.ncl.res.in/content/wearable-fabric-supercapacitors-based-cnts-and-polyhedral-zno-wide-potential-window