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Controlled Synthesis of Ni-Doped MoS2 Hybrid Electrode for Synergistically Enhanced Water-Splitting Process |
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| Authors: | Dr Ying Wang Dr Wenming Sun Xiaofei Ling Xiangkai Shi Dr Lanlan Li Prof Yida Deng Dr Cuihua An Dr Xiaopeng Han |
| Institution: | 1. School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry, for Functional Materials, Jiangsu Normal University, Xuzhou, P. R. China
These authors contributed equally to this work.;2. Department of Applied Chemistry, China Agricultural University, Beijing, 100193 P. R. China These authors contributed equally to this work.;3. School of Materials Science and Engineering, Tianjin University, Tianjin, 300350 P. R. China;4. School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300132 P. R. China;5. School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384 P. R. China |
| Abstract: | The development of high-efficiency, low-cost, and earth-abundant electrocatalysts for overall water splitting remains a challenge. In this work, Ni-modified MoS2 hybrid catalysts are grown on carbon cloth (Ni-Mo-S@CC) through a one-step hydrothermal treatment. The optimized Ni-Mo-S@CC catalyst shows excellent hydrogen evolution reaction (HER) activity with a low overpotential of 168 mV at a current density of 10 mA cm?2 in 1.0 m KOH, which is lower than those of Ni-Mo-S@CC (1:1), Ni-Mo-S@CC (3:1), and pure MoS2. Significantly, the Ni-Mo-S@CC hybrid catalyst also displays outstanding oxygen evolution reaction (OER) activity with a low overpotential of 320 mV at a current density of 10 mA cm?2, and remarkable long-term stability for 30 h at a constant current density of 10 mA cm?2. Experimental results and theoretical analysis based on density functional theory demonstrate that the excellent electrocatalytic performance can be attributed mainly to the remarkable conductivity, abundant active sites, and synergistic effect of the Ni-doped MoS2. This work sheds light on a unique strategy for the design of high-performance and stable electrocatalysts for water-splitting electrolyzers. |
| Keywords: | doping electrocatalysis HER MoS2 nanocomposite OER water splitting |