Nanostructured transition metal oxide synthesis possessing high energy density and stability is desirable for supercapacitors. Herein, we synthesize three‐dimensional NiCo₂O₄ (NCO) nanosheets with oxygen vacancies induced by sustainable and environmentally benign electrodeposition assisted chemical reduction process. Oxygen vacancies increase the conductivity, adsorptivity, and the active surface area, thereby enhancing the charge storage capabilities. The binder‐free NCO delivers the highest specific capacitance (C_sp) of 2065 F g⁻¹ at 1 A g⁻¹, retaining 89.30 % of its initial value at 10 A g⁻¹ after 10,000 continuous charge‐discharge (CD) cycles. An asymmetric supercapacitor (ASC) fabricated shows remarkable electrochemical properties with high energy density (E_max) of 28.6 Wh kg⁻¹ and power density (P_max) of 7.5 kW kg⁻¹. The assembled ASC reports exceptional cyclic retention of 90.6 % for 10,000 CD cycles with practical demonstration. The approach used herein is suitable for eco‐friendly supercapacitor electrode fabrication with large scale manufacturing capability and less capital investment.

中文翻译：

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具有诱导氧空位的电沉积NiCo2O4纳米片的经济有效合成：一种用于混合超级电容器的高效电极材料

具有高能量密度和稳定性的纳米结构过渡金属氧化物合成是超级电容器所需要的。在本文中，我们合成了具有可持续性和环境良性电沉积辅助化学还原过程引起的氧空位的三维NiCo ₂ O ₄（NCO）纳米片。氧空位增加了电导率，吸附性和活性表面积，从而增强了电荷存储能力。无粘接剂的NCO提供最高的比电容（C ^ _SP 2065 F G）^-1 1个A G ^-1，在10A克保持其初始值的89.30％^-1经过10,000次连续充放电（CD）循环后。所制造的不对称超级电容器（ASC）具有出色的电化学性能，具有28.6 Wh kg ^-1的高能量密度（E _max）和7.5 kW kg ^-1的功率密度（P _max）。组装的ASC报告了10,000个CD循环的90.6％的出色循环保持力，并进行了实际演示。本文使用的方法适用于具有大规模制造能力且投资成本较低的环保超级电容器电极的制造。