Boosting hydrogen evolution on NiFeZn electrocatalyst by defect surface modulation using alkali etching
- Authors
- Guo, W.; Kim, J.; Kim, H.; Kim, S.Y.; Ahn, Sang Hyun
- Issue Date
- Jan-2023
- Publisher
- Elsevier Ltd
- Keywords
- Alkali etching; Cation defect; Electrodeposition; Hydrogen evolution reaction; NiFeZn
- Citation
- International Journal of Hydrogen Energy, v.48, no.6, pp 2090 - 2100
- Pages
- 11
- Journal Title
- International Journal of Hydrogen Energy
- Volume
- 48
- Number
- 6
- Start Page
- 2090
- End Page
- 2100
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/59971
- DOI
- 10.1016/j.ijhydene.2022.10.115
- ISSN
- 0360-3199
1879-3487
- Abstract
- Developing highly efficient catalysts using facile approaches is important for accelerating the slow reaction kinetics of the alkaline hydrogen evolution reaction (HER) and ensuring cost-effective hydrogen production. In this study, we reported a facile alkali etching method to boost the HER activity immediately after electrodeposition of a NiFeZn catalyst on Ti paper. During etching, (oxy)hydroxides were formed on the surface, and Zn species were etched from the deposits, which resulted in a roughened surface with more valleys generated between grains, facilitating a faster mass transport during the electrochemical reaction. The etched catalyst exhibited a boosted HER overpotential of 57 mV at −10 mA/cm2 and accelerated HER kinetic with Tafel slope of 97 mV/dec compared with that of the pristine catalyst. Our results demonstrated an efficient approach for boosting the catalyst activity in the alkaline HER. © 2022 Hydrogen Energy Publications LLC
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Collections - College of Engineering > School of Chemical Engineering and Material Science > 1. Journal Articles
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