RGO-modified CoWO4 nanoparticles as new high-performance electrode materials for sodium-ion storage
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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.
KeywordsSodium-ion storage CoWO4/RGO nanocomposites Sodium-ion batteries Sodium-ion capacitors
This work was supported by the National Natural Science Foundation of China (No. 21403099), the Natural Science Funds for Distinguished Young Scholars of Gansu Province (No. 1606RJDA320), and the Natural Science Foundation of Hainan Province (No. 517301).
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