CaMoO₄ Nanoparticle-Doped Graphene Oxide as Electrodes for High-Performance Supercapacitors

Abstract

CaMoO 4 nanoparticles/graphene oxide (CaMoO 4 /GO) composites are prepared by a facile hydrothermal method. CaMoO 4 nanoparticles are adsorbed on the GO sheets by in situ reduction. Along with the synergistic effect between the CaMoO 4 and GO sheets, the CaMoO 4 /GO nanocomposites exhibited high performances as electrodes for supercapacitors. The specific capacity ([Formula: see text] of the CaMoO 4 /GO electrodes could be up to 571.82[Formula: see text]F[Formula: see text][Formula: see text][Formula: see text]g[Formula: see text] at 0.5[Formula: see text]A[Formula: see text][Formula: see text][Formula: see text]g[Formula: see text]. Furthermore, asymmetric supercapacitors (ASCs) are mainly composed of CaMoO 4 /GO composite and activated carbon (AC), respectively. The fabricated CaMoO 4 /GO//AC devices display an energy density of 25.18[Formula: see text]W[Formula: see text][Formula: see text][Formula: see text]h[Formula: see text][Formula: see text][Formula: see text]kg[Formula: see text] at 1710.3[Formula: see text]W[Formula: see text][Formula: see text][Formula: see text]kg[Formula: see text]. A blue LED is powered using two series-connected two ASC devices. These results indicate the considerable potential of CaMoO 4 /GO for use in high-performance energy storage devices.