CoMoO4·0.9H2O nanorods grown on reduced graphene oxide as advanced electrochemical pseudocapacitor materials

Abstract

In this work, one-dimensional CoMoO₄·0.9H₂O nanorods grown on reduced graphene oxide hybrid composites (CoMoO₄·0.9H₂O–rGO) with good electrochemical properties have been synthesized by a simple and environmentally friendly hydrothermal synthesis procedure. The conductive graphene not only improves the electron conductivity of the overall electrode but also provides strong synergistic effects with Faradaic pseudo-capacitance (CoMoO₄·0.9H₂O). Meanwhile, rGO can act as a buffer for the volume change, which can provide an assurance for better cycling performance of the CoMoO₄·0.9H₂O–rGO hybrid composites. An exceptionally high specific capacitance of 802.2 F g⁻¹ at a current density of 1 A g⁻¹ and good cycle stability with capacitance retention of ∼86.3% after 5000 cycles is obtained for the CoMoO₄·0.9H₂O–rGO composites. The remarkable electrochemical performance can make the CoMoO₄·0.9H₂O–rGO composites one of the most competitive electrode materials for electrochemical energy storage.