Abstract Transition metal oxides and sulfides exhibit excellent electrochemical properties owing to their various valence states, high electrical conductivities, large number of active sites, and superior electrochemical activities. In this study, core-shell structured CuCo2S4@CoMoO4 nanorods were prepared on nickel foam via the combination of the hydrothermal method and calcination. The CuCo2S4@CoMoO4 heterostructure shows improved electrochemical performance. The CuCo2S4 nanorods provided channels for rapid electron transport and effectively dispersed CoMoO4 particles, while the outer CoMoO4 shell inhibited the expansion of the inner CuCo2S4 nanorods during the redox reaction and increased the stability of the produced composite. The electrode fabricated from the CuCo2S4@CoMoO4 nanorod array grown on nickel foam possessed a high specific capacitance of 2058 F g−1 (5557 mF cm−2) at 1 mA cm−2. The asymmetrical supercapacitor formed after the addition of an activated carbon negative electrode demonstrated a high energy density of 45.73 W h kg−1 at a power density of 198.8 W kg−1. Further, it exhibited an outstanding cycling stability that corresponded to 83% specific capacitance retention after 3000 charge-discharge cycles.

中文翻译：

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用于先进电极材料的核壳结构的 CuCo2S4@CoMoO4 纳米棒

摘要 过渡金属氧化物和硫化物由于其价态多样、电导率高、活性位点多、电化学活性高而表现出优异的电化学性能。在这项研究中，通过水热法和煅烧相结合，在泡沫镍上制备了核壳结构的 CuCo2S4@CoMoO4 纳米棒。CuCo2S4@CoMoO4 异质结构显示出改进的电化学性能。CuCo2S4 纳米棒为快速电子传输提供了通道并有效分散了 CoMoO4 颗粒，而外层的 CoMoO4 壳层在氧化还原反应过程中抑制了内层的 CuCo2S4 纳米棒的膨胀，提高了复合材料的稳定性。由生长在泡沫镍上的 CuCo2S4@CoMoO4 纳米棒阵列制成的电极在 1 mA cm-2 下具有 2058 F g-1 (5557 mF cm-2) 的高比电容。添加活性炭负极后形成的不对称超级电容器在198.8 W kg-1的功率密度下表现出45.73 W h kg-1的高能量密度。此外，它表现出出色的循环稳定性，在 3000 次充放电循环后可保持 83% 的比电容。