RGO-modified CoWO4 nanoparticles as new high-performance electrode materials for sodium-ion storage

Abstract

In this work, the RGO-modified CoWO4 nanoparticles are synthesized by a feasible hydrothermal approach and studied as the high-performance sodium-ion storage materials. RGO can effectively improve overall electrical conductivity and maintain the stability of the composite structure. The composites exhibit a stabilized reversible capacity of 160 mAh g−1 at the current density of 100 mA g−1 after 100 cycles when tested as the anode materials of sodium-ion batteries (SIBs). The sodium-ion capacitors (SICs) were assembled using CoWO4/RGO nanocomposites as the negative electrode materials and the active carbon (AC) as the positive electrode materials. It could deliver a capacitance about 31 F g−1 at the current density of 100 mA g−1 and display a specific energy of 87.2 Wh kg−1 at the power density of 224.6 W kg−1. The outstanding electrochemical properties and high energy density of CoWO4/RGO anode materials indicate the huge potential for its application to sodium-ion storage devices.