Co, Ni-Doped MoS<sub>2</sub> Nanosheet Composites for Electrocatalytic Hydrogen Evolution
Denglin Zhu, Jiani Wang, Ling Qian, Sizhan Shu, Lihong Chen, Jincheng Li, Yuxiang Yao, Wenyue Dou, Yi Fu, Qiwen Huang, Xuejun Wang, Yujia Chen, Zile Zhou, Pingfan Wu
Abstract
Developing low-cost, highly active, and stable electrocatalysts is crucial for large-scale hydrogen production. Here, we utilized Anderson-type polyoxometalate (NH 4 ) 4 [NiMo 6 O 24 H 6 ]·5H 2 O (NiMo 6 ) as the precursor, [Co(NH 3 ) 6 ]Cl 3 as the cobalt source, and thiourea as the sulfur source to synthesize MoS 2 -based nanomaterials doped with Co and Ni, forming MoS 2 –Co 4 S 3 –NiS 2 . The catalyst exhibited a low overpotential of only 32 mV at 10 mA cm –2 with a Tafel slope of 33.46 mV dec –1 for hydrogen evolution. Moreover, they demonstrated excellent long-term stability in alkaline solutions. This controlled synthesis approach not only achieved superior hydrogen evolution reaction (HER) properties but also extended the application of polyoxometalates (POMs) in electrocatalysis.