Journal
ELECTROCHIMICA ACTA
Volume 354, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.136738
Keywords
Ternary metal borides; Hydrogen evolution reaction; Earth-abundant electrocatalysts; Neutral water electrolysis; H-adsorption energy
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Funding
- WOS-A scheme under DST [SR/WOS-A/PM-115/2016]
- SERB-DST [EMR/2016/003028]
- UGC
- UK Commonwealth Scholarship Commission through Commonwealth Rutherford Fellowship [INRF-2017-139]
- DST-SERB [YSS/2015/001315]
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Amorphous ternary metal borides in the form of Co-M-B (where, M = Fe, Ni, Cu, Mo, Mn, W or Cr) were developed for electrocatalytic hydrogen evolution in neutral and alkaline solutions. Except for Co-Cr-B, all the Co-M-B catalysts showed better hydrogen evolution rate than Co-B, with the lowest overpotential of 95 mV and 67 mV (at 10 mA/cm(2)) recorded for optimized Co-Mo-B catalyst, in pH 7 and pH 14, respectively. The reasons for enhancement in electrocatalytic rate, with inclusion of a second metal in CoB, were investigated by considering several material related factors, such as, physical and electrochemical surface area, turn-over frequency, surface elemental states & composition and charge-transfer resistance. These experimental results were complemented with computational investigations to identify the most suitable sites for hydrogen adsorption and determine their H-adsorption energies. In the end, industrial feasibility of the developed Co-M-B catalysts was illustrated by performing stability and recycling tests. (C) 2020 Elsevier Ltd. All rights reserved.
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