Green preparation of CoMoO4 nanoparticles through a mechanochemical method for energy storage applications†
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Abstract
In this study, a mechanochemical method was used to synthesize the α- and β-phases of CoMoO4, and the performances of the synthesized CoMoO4 for energy storage applications were studied. Among the synthesized samples, β-CoMoO4 nanoparticles showed a high specific capacitance/capacity of 182.6 F g−1 (73.0 C g−1) at a current density of 1 A g−1 owing to their large specific surface area. After 8000 cycles, a capacitance retention rate of approximately 86.3% was achieved. The asymmetric supercapacitor β-CoMoO4//AC prepared with β-CoMoO4 as the positive electrode and activated carbon as the negative electrode exhibited a specific energy density of 8.66 W h kg−1 at a power density of 755 W kg−1. Additionally, the effects of the ball-milling speed on the electrochemical performance of the samples calcined at different temperatures were intensively studied. This work highlights the green, facile, and low-cost features of the mechanochemical method for the preparation of bimetal oxides, providing a reference for the mechanochemical synthesis of other new materials.
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