In this work, we develop hierarchical NiCo₂S₄@NiMoO₄ nanosheet arrays directly anchored on nickel foam by a hydrothermal method. The self‐supported core‐shell architecture take advantage of high electroactive surface area, rapid channels for ion diffusion and electron transport, and the synergistic contributions from both the NiCo₂S₄ core and NiMoO₄ shell. Remarkably, the NiCo₂S₄@NiMoO₄ electrode showed high specific capacitance of 1487.6 F g⁻¹ at a current density of 1 A g⁻¹ and superior cycling stability (89.7 % capacitance retention after 8000 charge‐discharge cycles). An asymmetric supercapacitor (ASC) with an optimized cell voltage of 1.6 V was assembled by using activated carbon (AC) as the negative electrode and NiCo₂S₄@NiMoO₄ electrode as the positive electrode, achieving an extraordinary energy density of 53.2 Wh kg⁻¹ at a power density of 560 W kg⁻¹, and remained 34.8 Wh kg⁻¹ at a maximum power density of 11.2 kW kg⁻¹. The outstanding electrochemical behavior indicate that the NiCo₂S₄@NiMoO₄ nanosheet arrays hold great promise for high‐performance energy storage devices.

中文翻译：

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具有优异电化学性能的不对称超级电容器NiCo2S4 @ NiMoO4核壳纳米片阵列的构建

在这项工作中，我们开发了通过水热法直接锚固在泡沫镍上的分层NiCo ₂ S ₄ @NiMoO ₄纳米片阵列。自支撑的核壳结构利用了高电活性表面积，快速的离子扩散和电子传输通道以及NiCo ₂ S ₄核和NiMoO ₄壳的协同作用。值得注意的是，NiCo ₂ S ₄ @NiMoO ₄电极在电流密度为1 A g ^-1时显示出1487.6 F g ^-1的高比电容。以及出色的循环稳定性（8000次充放电循环后，电容保持率为89.7％）。通过使用活性炭（AC）作为负电极和NiCo ₂ S ₄ @NiMoO ₄电极作为正电极，组装了优化电池电压为1.6 V的不对称超级电容器（ASC），实现了53.2 Wh kg的非凡能量密度^-1在560公斤w ^的功率密度^-1，并保持34.8瓦千克^-1在11.2千瓦公斤的最大功率密度^-1。出色的电化学行为表明，NiCo ₂ S ₄ @NiMoO ₄ 纳米片阵列对高性能储能设备具有广阔的前景。