过电位
材料科学
塔菲尔方程
超级电容器
密度泛函理论
过渡金属
二硫化钨
石墨烯
硫化物
化学工程
纳米技术
交换电流密度
电化学
催化作用
电极
物理化学
化学
复合材料
冶金
计算化学
工程类
生物化学
作者
Sajjad Hussain,Dhanasekaran Vikraman,Maria Sarfraz,Muhammad Faizan,Supriya A. Patil,Khalid Mujasam Batoo,Kyung‐Wan Nam,Hyun‐Seok Kim,Jongwan Jung
出处
期刊:Small
[Wiley]
日期:2022-12-11
卷期号:19 (8)
被引量:6
标识
DOI:10.1002/smll.202205881
摘要
Two-dimensional layered transition metal dichalcogenides have emerged as promising materials for supercapacitors and hydrogen evolution reaction (HER) applications. Herein, the molybdenum sulfide (MoS2 )@vanadium sulfide (VS2 ) and tungsten sulfide (WS2 )@VS2 hybrid nano-architectures prepared via a facile one-step hydrothermal approach is reported. Hierarchical hybrids lead to rich exposed active edge sites, tuned porous nanopetals-decorated morphologies, and high intrinsic activity owing to the strong interfacial interaction between the two materials. Fabricated supercapacitors using MoS2 @VS2 and WS2 @VS2 electrodes exhibit high specific capacitances of 513 and 615 F g-1 , respectively, at an applied current of 2.5 A g-1 by the three-electrode configuration. The asymmetric device fabricated using WS2 @VS2 electrode exhibits a high specific capacitance of 222 F g-1 at an applied current of 2.5 A g-1 with the specific energy of 52 Wh kg-1 at a specific power of 1 kW kg-1 . For HER, the WS2 @VS2 catalyst shows noble characteristics with an overpotential of 56 mV to yield 10 mA cm-2 , a Tafel slope of 39 mV dec-1 , and an exchange current density of 1.73 mA cm-2 . In addition, density functional theory calculations are used to evaluate the durable heterostructure formation and adsorption of hydrogen atom on the various accessible sites of MoS2 @VS2 and WS2 @VS2 heterostructures.
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