电催化剂
超级电容器
材料科学
纳米技术
化学工程
碳纳米纤维
异质结
电极
纳米纤维
碳纤维
碳纳米管
光电子学
化学
电化学
复合材料
复合数
物理化学
工程类
作者
Hao Niu,Zhengguang Zou,Qian Wang,Kai Zhu,Ke Ye,Guiling Wang,Dianxue Cao,Jun Yan
标识
DOI:10.1016/j.cej.2020.125672
摘要
Abstract Metallic 1T MoS2 is a promising anode candidate for supercapacitors due to its intrinsically excellent electrical conductivity and high electrochemical activity. However, it is quite unstable and hard to be massively synthesized through common methods. Herein, structurally stable ultrathin (1–3 layers) in-plane 1T-2H MoS2 heterostructures have been rationally modulated and coaxially aligned on three-dimensional carbon nanofibers (MoS2/CF) through a facile hydrothermal approach for supercapacitors and electrocatalysis. Benefiting from the unique heterostructure, the MoS2/CF composite shows amazing stability with no obvious change after being stored in air for over 36 months. In addition, it presents high specific capacitance of 310 F g−1 and remarkable rate capability of 78% at 100 mV s−1. The fabricated asymmetric supercapacitor delivers an impressive energy density of 81.4 Wh kg−1 in 1 M Na2SO4 solution attributed to the high specific capacitance and large operating voltage range of 2 V. Moreover, the MoS2/CF composite also demonstrates enhanced electrocatalytic activity for hydrogen evolution reaction with a low overpotential of 194 mV at 10 mA cm−2. The work may promote the developments of high-performance bifunctional energy conversion and storage systems in future.
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