Effect of Mo content on hydrogen evolution reaction activity of Mo2C/C electrocatalysts |
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| Affiliation: | 1. Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India;2. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India;3. Materials Science Division, Bhabha Atomic Research Centre, Mumbai, 400085, India;4. Water and Steam Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India;5. Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India;1. Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India;2. Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India;3. Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, 400005, India;4. Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai, 400094, India;1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, PR China;2. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, 610059, PR China;1. College of Life Science, Jiangxi Normal University, Nanchang, 330022, China;2. Institute for Clean Energy & Advanced Materials, Faculty of Materials and Energy, Southwest University, Chongqing, 400715, China;3. Panxi Science and Technology Innovation Center & Panzhihua Engineering Center for Graphene, Panzhihua University, Panzhihua, 617000, China;1. Center of Excellence in Nanotechnology (CENT), King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;2. Department of Chemistry, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;3. Researcher at K.A.CARE Energy Research & Innovation Center, Dhahran, Saudi Arabia;1. College of Environment Science and Engineering, Taiyuan University of Technology, No.209 University Street, Jinzhong 030600, Shanxi, PR China;2. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, No.79 Yingze West Street, Taiyuan 030024, Shanxi, PR China;3. Shanxi Kunming Tobacco Co. Ltd., 21 Dachang South Road, Taiyuan 030032, Shanxi, PR China;4. Department of Nuclear Environment Science, China Institute for Radiation Protection, No.102 Xuefu Street, Taiyuan 030006, Shanxi, PR China;5. Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, No.79 Yingze West Street, Taiyuan 030024, Shanxi, PR China |
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| Abstract: | Recent research suggests that molybdenum carbide (β-Mo2C) has the potential to be a cheap and active substitute for Pt-based electrocatalyst for hydrogen evolution reaction. In this article molybdenum carbide (Mo2C) electrocatalysts immobilized on carbon support were synthesized and evaluated for hydrogen evolution reaction (HER). The quantity of Mo in the samples was varied to understand the effect of Mo content in Mo2C/C electrocatalyst on the structure, morphology, electrochemical properties and HER. The Mo weight percentages determined by ICP-OES technique in four Mo2C/C samples prepared were found as ~9.3, 15.8, 20.4 and 28.0. SAXS studies revealed that the pore size of the carbon increased with an increase in Mo content, most probably to accommodate the Mo2C motifs. X-ray photoelectron spectra showed that the amount of low valent Mo increased as we increased the Mo content up to 20 wt % but decreased in the 28 wt % sample. All the samples were active for electrochemical HER with the sample having ~20 wt % Mo showing the highest activity and exhibited a Tafel slope of 69 mVdec−1. Among all samples the 20 wt% Mo sample exhibited the highest electrochemical surface area (ECSA) of ~2.92 mFcm−2 and minimum charge transfer resistance for the HER. Thus, it is concluded that 20 wt% Mo in Mo2C/C electrocatalyst evolves with ideal pore size, highest ECSA, smooth charge transfer and thus exhibits the best electrochemical properties for HER. |
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| Keywords: | Hydrogen evolution reaction Electrocatalyst Molybdenum carbide Tafel slope Small angle X-ray scattering |
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