Electrodeposition of Ni-Co-S Electrocatalyst Using 2,5-dimercapto-1,3,4-thiadiazole as S Precursor for Hydrogen Evolution Reaction at Neutral pH
- Authors
- Yoon, Yeosol; Yoo, Sehyun; Lim, Taeho
- Issue Date
- Sep-2023
- Publisher
- SPRINGER
- Keywords
- Hydrogen Evolution Reaction; Electrodeposition; Bimetal Sulfide; Nickel Cobalt Sulfide; Neutral pH
- Citation
- ELECTROCATALYSIS, v.14, no.5, pp.800 - 809
- Journal Title
- ELECTROCATALYSIS
- Volume
- 14
- Number
- 5
- Start Page
- 800
- End Page
- 809
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/44217
- DOI
- 10.1007/s12678-023-00837-8
- ISSN
- 1868-2529
- Abstract
- Among various chalcogenide materials, transition metal sulfides are known to be effective catalysts for the electrochemical hydrogen evolution reaction (HER). In particular, Ni-Co-S is a promising material for the next generation of non-precious metal HER catalysts due to its excellent HER activity in neutral pH solutions. Ni-Co-S is also advantageous in large-scale applications, as it enables relatively simple catalytic synthesis through electrodeposition. In this study, we employed a new S precursor, 2,5-dimercapto-1,3,4-thiadiazole (DMTD), for the electrodeposition of Ni-Co-S, instead of the conventional S precursor, thiourea (TU). Ni-Co-S synthesized with DMTD (Ni-Co-S-DMTD) showed enhanced HER activity at neutral pH compared to that synthesized with TU (Ni-Co-S-TU). It has been found that this improvement in activity is due to the large surface area and high S content of Ni-Co-S-DMTD. The S content and HER activity of Ni-Co-S-DMTD depend on the concentration of DMTD. At the optimal DMTD concentration (12 mM), Ni-Co-S-DMTD exhibited an overpotential of 303 mV at a current density of 10 mA cm(-2) and a Tafel slope of 99 mV dec(-1) in a phosphate buffer solution (pH 7.4).
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