文献类型：期刊文献

英文题名：Microstructure and electrochemical performance of sulfur-containing nickel based composites for supercapacitors

作者：Liang, Ying[1]; Li, Ao[1]

机构：[1] School of Physics, East China University of Science and Technology, Shanghai, 200237, China

年份：2025

外文期刊名：Ionics

收录：EI(收录号：20260119849633)

语种：英文

外文关键词：Crystallinity - Electrodes - Energy storage - Morphology - Nickel oxide - Nickel sulfates - Reaction kinetics - Stability - Sulfur - Sulfur compounds - Synthesis (chemical)

摘要：Nickel based materials, including nickel hydroxides, oxides, and sulfides, typically have significantly larger theoretical specific capacitance but poor structural stability and sluggish reaction kinetics. To explore strategies for improving their electrochemical performance, this study focuses on the microstructure and electrochemical properties of sulfur-containing nickel based composites. NiS2/Ni(OH)2 composite with a porous structure formed by ultrathin nanosheets was firstly synthesized via a facile liquid-phase method. After subsequent thermal treatment at different temperatures (150 ℃, 300 ℃, 450 ℃ and 550 ℃), the structural phase, component and morphology of the composite underwent changes, resulting in NiS1.97/NiS/Ni(OH)2, Ni3S2/NiO and Ni3S2/NiO/Ni composites with different morphologies. Among the synthesized composites, NiS2/Ni(OH)2 has the largest specific capacitance, which is 1152F g? 1 at a current density of 1A g? 1, and still reaches 321F g? 1 at 10A g? 1. This is attributed to its relatively large specific surface area and low crystallinity, which can provide more active sites and reduced path for ion diffusion, thereby improving energy storage efficiency. Ni3S2/NiO/Ni has a smaller specific capacitance but better stability, with a capacitance retention of 149.8% after 10,000 cycles at 2A g? 1. Furthermore, a fabricated hybrid supercapacitor device with NiS2/Ni(OH)2 composite as the positive electrode realizes an energy density of 12.1 Wh kg? 1 at 253.1W kg? 1, and 7.6 Wh kg? 1 at a higher power density of 1277.8W kg? 1. This work may provide a way to improve the energy storage of single metal materials. ? The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.