Two-Dimensional Cadmium Hydroxide Nanosheets for Electrochemical Capacitors Under High Operating Voltage

Abstract

Abstract: Electrochemical capacitors are deemed to be the most prospective energy storage devices in the field of alternative energy sources. Here, cadmium hydroxide (Cd(OH)<inf>2</inf>) nanosheets are hydrothermally synthesized and used as electrodes for supercapacitors. Physiochemical properties of the as-synthesized materials are examined using powder x-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy and energy-dispersive x-ray spectroscopy measurements. Electrochemical investigations reveal an excellent operating potential window of 1.5 V, with the specific capacitance of ? 71 F g?1 at a scan rate of 2 mV s?1. In addition, the Cd(OH)<inf>2</inf> electrodes are complemented by good cyclic retention for 2000 cycles. Further, the analysis of the type of charge-storage mechanism reveals prominent contributions from the diffusion-controlled processes. Graphic Abstract: [Figure not available: see fulltext.]. © 2019, The Minerals, Metals & Materials Society.