二硫化钼
塔菲尔方程
材料科学
过电位
纳米片
石墨烯
钴
催化作用
化学工程
电化学
制氢
钼
分解水
纳米技术
光催化
电极
复合材料
化学
冶金
有机化学
工程类
物理化学
作者
Shatila Sarwar,Mao-Chia Lin,Md Robayet Ahasan,Yifan Wang,Ruigang Wang,Xinyu Zhang
标识
DOI:10.1007/s42114-022-00424-3
摘要
Molybdenum disulfide (MoS2) nanosheets are promising candidates as electrode materials for the efficient hydrogen production through water splitting. However, their activities are only governed by the edge sites, and their charge transfer efficiencies are still unsatisfactory. Defect generation and hybridization are two very effective ways to tune the nanostructures of MoS2 and enhance their electrocatalytic properties. Herein, cobalt-doped molybdenum disulfide (Co-MoS2) nanosheets have been synthesized on graphene network (Co-MoS2/G) by an ultrafast, facile, and reliable microwave irradiation technique. The structural, morphological, and compositional properties were characterized for these Co-MoS2/G composites. The compositionally optimized catalyst of as-produced Co-MoS2/G delivers excellent hydrogen evolution reaction (HER) performance in acidic medium with the best combination of three major parameters, resulting in a low overpotential of 78.1 mV, a small Tafel slope of 40.0 mV per decade, and a high exchange current density of 0.0917 mA cm−2, which also exhibits excellent electrochemical stability for 5000 cycles with negligible loss of the cathodic current and long-term durability for 94 h. Co-doping greatly enhanced the intrinsic activity of MoS2 nanosheet catalyst by creating abundant defects, and in addition, the integration of graphene notably promoted the electrical conductivity and mechanical properties of Co-MoS2/G composites. This study would supply an ultrafast, simple, and efficient strategy for developing excellent metal-doped electrocatalysts for HER.Graphical abstract
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