In this work, a hierarchical 2D polyaniline (PANI)/Ni₃S₂ nanosheet arrays on Ni foam (NF) with open network was successfully developed by the growth of Ni₃S₂ nanosheet arrays derived from 2D Ni−MOF templates followed by the electrodeposition of a layer of PANI nanoflakes. The as‐prepared PANI/Ni₃S₂/NF was served as self‐standing supercapacitor electrode. The optimized PANI/Ni₃S₂/NF‐100 electrode exhibits a high areal capacity of 1.56 mA h cm⁻² (487.5 mA h g⁻¹) at 5 mA cm⁻² and good rate capability (57.7 % retention at 50 mA cm⁻²), which significantly outperforms individual PANI/NF or Ni₃S₂/NF. Furthermore, an asymmetric supercapacitor fabricated by PANI/Ni₃S₂/NF‐100 and activated carbon electrodes can deliver a high energy density of 48.3 W h kg⁻¹ at a power density of 799.8 W kg⁻¹ with outstanding durability (85.7 % retention of the initial capacity) during 15000 consecutive charge‐discharge cycles. The superior electrochemical performance of PANI/Ni₃S₂/NF‐100 is attributed to the unique hierarchical PANI/Ni₃S₂ nanosheet arrays structure. Firstly, the hierarchical open network facilitates the electrolyte ions transport. Secondly, the ultrathin 2D Ni₃S₂ nanosheets lead to abundant electroactive sites for the Faradaic process, and the conductive PANI layer builds superb highway for fast electron transfer. Thirdly, the free‐standing electrode enables fast redox reaction and low interfacial resistance. Finally, the synergetic effect of Ni₃S₂ and PANI also contributes to the enhanced capacity.

中文翻译：

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用于高性能非对称超级电容器的泡沫镍上二维二维PANI / Ni3S2纳米片阵列的构建

在这项工作中，通过从二维Ni-MOF模板衍生的Ni ₃ S ₂纳米片阵列的生长，成功开发了具有开放网络的Ni泡沫（NF）上的分层2D聚苯胺（PANI）/ Ni ₃ S ₂纳米片阵列。电沉积一层PANI纳米薄片。所制备的PANI / Ni ₃ S ₂ / NF用作自立式超级电容器电极。优化的PANI / Ni ₃ S ₂ / NF‐100电极在5 mA cm ^-2时具有1.56 mA h cm ^-2（487.5 mA h g ^-1）的高面积容量，并具有良好的倍率能力（在50 mA cm时保留57.7％）⁻²），其性能明显优于单个PANI / NF或Ni ₃ S ₂ / NF。此外，由PANI / Ni ₃ S ₂ / NF‐100和活性炭电极制成的不对称超级电容器可以以799.8 W kg ^-1的功率密度提供48.3 W h kg ^-1的高能量密度，并具有出色的耐久性（85.7％在15000个连续的充放电循环中保持初始容量）。PANI / Ni ₃ S ₂ / NF‐100的优异电化学性能归因于独特的分层PANI / Ni ₃ S ₂纳米片阵列结构。首先，分层的开放网络促进了电解质离子的传输。其次，超薄的2D Ni ₃ S ₂纳米片为法拉第过程带来了丰富的电活性位，而导电的PANI层则为快速的电子转移建立了极好的通道。第三，独立式电极可实现快速的氧化还原反应和较低的界面电阻。最后，Ni ₃ S ₂和PANI的协同作用也有助于提高容量。