Supercapacitors are important renewable and sustainable electrochemical energy storage devices with significant advantages including rapid charge/discharge rates, long cycle lifetimes, and high power densities. Herein, to achieve high-performance supercapacitors, Ni_3-xFe_xS₂ nanosheet arrays were synthesized on Ni foam with different Ni/Fe ratios. The incorporation of Fe atoms allows the adjustment of the electron configuration of the Ni–Fe bimetal sulfides and thus significantly influenced their electrochemical activity in a supercapacitor system. As expected, compared with the monometal sulfide Ni₃S₂, the Ni₂FeS₂-based supercapacitor delivered a superior capacitive performance and rate capability owing to its unique nanosheet array structure and bimetallic composition.

中文翻译：

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在泡沫镍上合理设计Ni 3-x Fe x S 2纳米片阵列，以增强超级电容器性能

超级电容器是重要的可再生和可持续的电化学储能设备，具有明显的优势，包括快速的充电/放电速率，长的循环寿命和高功率密度。在此，为了获得高性能的超级电容器，在具有不同Ni / Fe比的Ni泡沫上合成了Ni _{3- x} Fe _x S ₂纳米片阵列。Fe原子的掺入可以调节Ni-Fe双金属硫化物的电子构型，因此极大地影响了它们在超级电容器系统中的电化学活性。不出所料，与单金属硫化物Ni ₃ S _2相比，Ni ₂ FeS ₂超级电容器由于其独特的纳米片阵列结构和双金属成分而具有出色的电容性能和速率性能。