Cobalt‐Doping in Molybdenum‐Carbide Nanowires Toward Efficient Electrocatalytic Hydrogen Evolution |
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| Authors: | Huanlei Lin Ning Liu Zhangping Shi Yulin Guo Yi Tang Qingsheng Gao |
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| Affiliation: | 1. Department of Chemistry, Jinan University, Guangzhou, P.R China;2. Guangdong Provincial Key Laboratory of Emergency Test for Dangerous Chemicals, China National Analytical Center, Guangzhou, China;3. Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Laboratory of Advanced Materials and Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, P.R. China |
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| Abstract: | Efficient hydrogen evolution reaction (HER) over noble‐metal‐free electrocatalysts provides one of the most promising pathways to face the energy crisis. Herein, facile cobalt‐doping based on Co‐modified MoOx–amine precursors is developed to optimize the electrochemical HER over Mo2C nanowires. The effective Co‐doping into Mo2C crystal structure increases the electron density around Fermi level, resulting in the reduced strength of Mo–H for facilitated HER kinetics. As expected, the Co‐Mo2C nanowires with an optimal Co/Mo ratio of 0.020 display a low overpotential (η10 = 140 and 118 mV for reaching a current density of –10 mA cm?2; η100 = 200 and 195 mV for reaching a current density of –100 mA cm?2), a small Tafel slope (39 and 44 mV dec?1), and a low onset overpotential (40 and 25 mV) in 0.5 m H2SO4 and 1.0 m KOH, respectively. This work highlights a feasible strategy to explore efficient electrocatalysts via engineering on composition and nanostructure. |
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| Keywords: | cobalt‐doping electronic density hydrogen molybdenum carbide nanowires |
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