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Binder-free novel Cu<sub>4</sub>SnS<sub>4</sub> electrode for high-performance supercapacitors
Lokhande, A.C.,Patil, Amar,Shelke, A.,Babar, P.T.,Gang, M.G.,Lokhande, V.C.,Dhawale, Dattatray S.,Lokhande, C.D.,Kim, Jin Hyeok Elsevier 2018 ELECTROCHIMICA ACTA Vol.284 No.-
<P><B>Abstract</B></P> <P>In this work, for the first time, we report the direct coating of ternary chalcogenide-based nanostructured Cu<SUB>4</SUB>SnS<SUB>4</SUB> (CTS) thin film electrodes for the energy storage application. The phase purity, composition, microstructure, optical and electrical properties of the synthesized electrode are validated through comprehensive characterization techniques. In the supercapacitive application, the CTS electrode delivers an excellent performance with the maximum specific capacitance of 704 F/g, an energy density of 27.77 Wh/kg and a power density of 7.14 kW/kg in 1 M NaOH electrolyte solution. The intrinsic electrode properties such as the electronic conductivity, crystal structure and film hydrophilicity are found to be influential parameters for the obtained high performance and are studied in detail. Furthermore, the solid-state supercapacitive device fabricated using CTS electrodes and polymer gel electrolyte (PVA/NaOH) in a symmetric configuration, demonstrated the highest specific capacitance of 34.9 F/g with an energy density of 2.4 Wh/kg, a power density of 0.291 kW/kg and more than 89.9% capacitive retention. The presented work reports a simple, cost-effective, scalable and replicable approach for electrode application in supercapacitor industry.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Specific capacitance of 704 F/g, an energy density of 27.77 Wh/kg and a power density of 7.14 kW/kg. </LI> <LI> The intrinsic electrode properties, such as the electronic conductivity, crystal structure and hydrophilicity are found to be influential parameters. </LI> <LI> Symmetric device: specific capacitance of 34.9 F/g, an energy density of 2.4 Wh/kg, a power density of 0.291 kW/kg with 89.9% capacitive retention for 1000 cycles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The obtained porous microstructure of the CTS thin film electrode using SILAR method and its electrochemical characterization in solid-state symmetric configuration. The CV and GCD curves are accomplished in the potential window range of 0–1.2 V. The device exhibited 89.9% stability retention after 1000 CV cycles.</P> <P>[DISPLAY OMISSION]</P>
Babar, P.T.,Lokhande, A.C.,Pawar, B.S.,Gang, M.G.,Jo, Eunjin,Go, Changsik,Suryawanshi, M.P.,Pawar, S.M.,Kim, Jin Hyeok Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.427 No.1
<P><B>Abstract</B></P> <P>The development of an inexpensive, stable, and highly active electrocatalyst for oxygen evolution reaction (OER) is essential for the practical application of water splitting. Herein, we have synthesized an electrodeposited cobalt hydroxide on nickel foam and subsequently annealed in an air atmosphere at 400°C for 2h. In-depth characterization of all the films using X-ray diffraction (XRD), X-ray photoelectron emission spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), electrochemical impedance spectroscopy (EIS) and linear sweep voltammetry (LSV) techniques, which reveals major changes for their structural, morphological, compositional and electrochemical properties, respectively. The cobalt hydroxide nanosheet film shows high catalytic activity with 290mV overpotential at 10mAcm<SUP>−2</SUP> and 91mVdec<SUP>−1</SUP> Tafel slope and robust stability (24h) for OER in 1M KOH electrolyte compared to cobalt oxide (340mV). The better OER activity of cobalt hydroxide in comparison to cobalt oxide originated from high active sites, enhanced surface, and charge transport capability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Simple and highly efficient method for deposition of Cobalt based electrode. </LI> <LI> Efficient OER performance of Co(OH)<SUB>2</SUB>. </LI> <LI> Co(OH)<SUB>2</SUB> exhibits low overpotential (290mV) over Co<SUB>3</SUB>O<SUB>4</SUB> (340mV) at current density of 10mAcm<SUP>−2</SUP>. </LI> <LI> Superior performance of Co(OH)<SUB>2</SUB> mainly due to large surface and active sites compare to Co<SUB>3</SUB>O<SUB>4</SUB>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>