Abstract A facile, controllable and low cost hydrothermal method has been used to fabricate CuCo2O4 nanorods (CCN) CuCo2O4 nanorods@PPy nanowires (CCNP) arrays on Ni foam. The impressive heterostructures are favorable to shortening the paths ion/electron diffusion, giving a superior specific surface area and revealing richer electroactive sites. The electrochemical properties are tested in three-and two-electrode configurations, signifying a better specific capacitance and a long-term cycling stability. Remarkably, the CCNP heterostructure electrode exhibits an excellent value of 2272 Fg−1 at 2 Ag−1. The specific capacitance retention is almost 91 and 96 % for CCN and CCNP electrodes at 20 Ag−1 after 5000 cycle. Extremely, the optimized CuCo2O4@PPy//AC ASC cell is cycled reversibly in a wide voltage region as high as 1.4 V and exhibits a specific capacitance of 91 Fg-1 even at a high current density of 20 Ag-1 with a maximum energy density of 52 Wh kg-1.

中文翻译：

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具有超高电容和有吸引力的循环性能的分层异质结构CuCo2O4@PPy基不对称器件的设计和制造

摘要 一种简便、可控且低成本的水热法已被用于在泡沫镍上制备 CuCo2O4 纳米棒 (CCN) CuCo2O4 纳米棒@PPy 纳米线 (CCNP) 阵列。令人印象深刻的异质结构有利于缩短离子/电子扩散的路径，提供优异的比表面积并揭示更丰富的电活性位点。电化学性能在三电极和两电极配置中进行测试，表明具有更好的比电容和长期循环稳定性。值得注意的是，CCNP 异质结构电极在 2 Ag-1 时表现出优异的 2272 Fg-1 值。在 5000 次循环后，CCN 和 CCNP 电极在 20 Ag-1 下的比电容保持率几乎为 91% 和 96%。极端情况下，优化的 CuCo2O4@PPy//AC ASC 电池在高达 1 的宽电压范围内可逆循环。