In this paper, we report a high-performance self-supported supercapacitor electrode composed of a cracked bark-shaped Ni-Co-Mn ternary metallic sulfide (NiCoMnS₄) nanostructure on carbon cloth prepared by a simple one-step hydrothermal process and subsequent electrochemical treatment. The electrode delivers a high specific discharge capacity of up to 2470.4 F g⁻¹ at 1 A g⁻¹ and high rate performances of 1635.6 F g⁻¹ at 10 A g⁻¹ and 910.2 F g⁻¹ even at 32 A g⁻¹. Cycling tests indicate that NiCoMnS₄ could maintain >91.1% of its initial capacity and nearly 100% Coulombic efficiency over 10,000 cycles at 8 A g⁻¹. An aqueous asymmetric supercapacitor assembled with NiCoMnS₄ as the cathode, activated carbon as the anode, and 1 mol L⁻¹ KOH as the electrolyte delivers an energy density of 68.2 W h kg⁻¹ at 850.1 W kg⁻¹ and capacity retention of 92.5% after 10,000 cycles at 4 A g⁻¹. Given the excellent performance and simple material preparation of our proposed device, this study provides a valuable foundation for the development of self-supported metallic sulfide based electrodes with high electrochemical properties for potential application in aqueous asymmetric super-capacitors.

在本文中，我们报告了一种高性能的自支撑超级电容器电极，该电极由开裂的树皮状Ni-Co-Mn三元金属硫化物（NiCoMnS ₄）纳米结构组成，该电极通过简单的一步水热法和随后的电化学方法制备治疗。电极提供高达2470.4 F G高比放电容量^-1 1 A G ^-1和1635.6 F G高倍率特性^-1以10 A G ^-1和910.2 F G ^-1甚至在32 A G ^{- 1}。循环测试表明，在8 A g ^-1的10,000个循环中，NiCoMnS ₄可以保持> 91.1％的初始容量和近100％的库仑效率。水性非对称超电容器与NiCoMnS组装₄作为阴极，活性炭作为阳极，和1mol大号^-1 KOH作为电解质提供68.2 W时千克的能量密度^-1在850.1千克w ^ ^-1的92.5和容量保持在4 A g ^-1下进行10,000次循环后的％。鉴于我们提出的设备的优异性能和简单的材料制备，这项研究为开发具有高电化学性能的自支撑金属硫化物基电极提供了宝贵的基础，可用于水性不对称超级电容器。