In this work, NiSe@Ni₃S₂ core-shell composite material was prepared with Ni foam as a substrate. Due to their unique structure, the NiSe@Ni₃S₂ composite shows a superior specific capacitance of 1215 F g⁻¹, which is better than pure NiSe. Meanwhile, the NiSe@Ni₃S₂ electrode demonstrates a wonderful cycling performance with 91.25% retention after 5000 cycles. The positive electrode materials and the negative electrode materials were designed employing the asymmetric supercapacitor (ASC) and the activated carbon (AC), respectively (ASC was created using NiSe@Ni₃S₂ composite).When the optimal potential window of 1.8 V and the power density of 839 W kg⁻¹, the maximum energy density of 38 W h kg⁻¹ was reached. In addition, after 5000 charge-discharge cycles, the NiSe@Ni₃S₂/NF//AC ASC devices exhibit a favorable cycling performance of 81.8% capacitance retention. These outstanding electrochemical performances demonstrate feasible testimony to verify that the NiSe@Ni₃S₂ composite shows unlimited latent force at the research field of energy storage devices in the future.

中文翻译：

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Ni泡沫上的自支撑NiSe @ Ni 3 S 2核壳复合材料，用于高性能非对称超级电容器

在这项工作中，以Ni泡沫为基材制备了NiSe @ Ni ₃ S ₂核壳复合材料。由于其独特的结构，NiSe @ Ni ₃ S ₂复合材料显示出优异的比电容1215 F g ^-1，比纯NiSe更好。同时，NiSe @ Ni ₃ S ₂电极表现出出色的循环性能，在5000次循环后保留率为91.25％。正电极材料和负电极材料分别采用不对称超级电容器（ASC）和活性炭（AC）设计（ASC使用NiSe @ Ni ₃ S _2创建当最佳电位窗口为1.8 V，功率密度为839 W kg ^-1时，最大能量密度达到38 W h kg ^-1。另外，经过5000次充放电循环，NiSe @ Ni ₃ S ₂ / NF // AC ASC器件表现出良好的循环性能，电容保持率为81.8％。这些优异的电化学性能证明了可行的证词，以证明NiSe @ Ni ₃ S ₂复合材料在未来的储能器件研究领域显示出无限的潜能。