High-Performance 3D Nanostructured Silver Electrode for Micro-Supercapacitor Application

Description

In the current energy crisis scenario, the development ofrenewable energy forms such as energy storage systems among the super-capacitors is an urgent need as a tool for environmental protection againstincreasing pollution. In this work, we have designed a novel 3D nanostructuredsilver electrode through an antireplica/replica template-assisted procedure. Thechemical surface and electrochemical properties of this novel 3D electrode havebeen studied in a 5 M KOH electrolyte. Microstructural characterization andcompositional analysis were studied by SEM, energy-dispersive X-ray spectros-copy, XRD technique, and Kripton adsorption at −198 °C, together with cyclicvoltammetry and galvanostatic charge−discharge cycling measurements,Coulombic efficiency, cycle stability, and their leakage current drops, in additionto the self-discharge and electrochromoactive behavior, were performed to fullycharacterize the 3D nanostructured electrode. Large areal capacitance value of 0.5F/cm2 and Coulombic efficiency of 97.5% are obtained at a current density of 6.4 mA/cm2 for a voltage window of 1.2 V (between−0.5 and 0.8 V). The 3D nanostructured silver electrode exhibits excellent capacitance retention (95%) during more than 2600cycles, indicating a good cyclic stability. Additionally, the electrode delivers a high energy density of around 385.87 μWh/cm2 and apower density value of 3.82 μW/cm2 and also displays an electrochromoactive behavior. These experimental results strongly supportthat this versatile combined fabrication procedure is a suitable strategy for improving the electrochemical performances of 3Dnanostructured silver electrodes for applications as micro-supercapacitors or in electrochemical devices

Abstract

Ministerio de Ciencia, Innovación y Universidades (MICINN). España PID2019-108075RB-C32/AEI/10.13039/501100011033

Abstract

Principado de Asturias SV-PA-21-AYUD/2021/51399

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