Unique hierarchical cyclic voltammetry oxidation (CVO) Cu@CuO nanorod arrays were obtained by an in situ oxidation reaction with the combination of calcination and cyclic voltammetry oxidation strategies. The areal capacitance of this CVO Cu@CuO electrode reaches 1.674 F cm⁻² (594.27 F g⁻¹) at a current density of 2 mA cm⁻², which is significantly higher than those of Cu@Cu(OH)₂ (0.207 F cm⁻²) and Cu@CuO (1.307 F cm⁻²) electrodes. In addition, an excellent rate capacity (1.085 F cm⁻² at a current density of 30 mA cm⁻²) and remarkable cycling stability (96.45% after 4000 cycles) were observed. Additionally, the CVO Cu@CuO nanorod arrays can also be utilized as the positive electrode to manufacture asymmetric supercapacitor (ASC) devices, realizing a high cell voltage of 1.5 V and an outstanding energy density of up to 35.43 W h kg⁻¹ at a power density of 520.99 W kg⁻¹. The excellent electrochemical properties can be credited to the unique hierarchical structures. This work makes it attractive in that the CVO Cu@CuO can be utilized as a potential electrode material for supercapacitors.

中文翻译：

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分层的CuO纳米棒阵列原位上三维铜泡沫生成通过循环伏安法的氧化用于高性能超级电容器†

通过原位氧化反应并结合煅烧和循环伏安法氧化策略获得了独特的分级循环伏安法氧化（CVO）Cu @ CuO纳米棒阵列。在2 mA cm ^-2的电流密度下，此CVO Cu @ CuO电极的面电容达到1.674 F cm ^-2（594.27 F g ^-1），明显高于Cu @ Cu（OH）₂（0.207 F cm ^-2）和Cu @ CuO（1.307 F cm ^-2）电极。此外，极好的速率容量（1.085˚F厘米^-2在30毫安cm 2的电流密度^-2）和显着的循环稳定性（4000次循环后为96.45％）。另外，所述铜CVO @ CuO的纳米棒的阵列也可以利用作为正极制造非对称超电容器（ASC）的设备，实现了1.5伏的高电池电压和向上的杰出能量密度35.43 W时千克^-1以功率密度为520.99 W kg ^-1。优异的电化学性能可归因于独特的分层结构。这项工作之所以吸引人，是因为CVO Cu @ CuO可用作超级电容器的电位电极材料。