Acid-durable, high-performance cobalt phosphide catalysts for hydrogen evolution in proton exchange membrane water electrolysis
- Authors
- Yoon, Young; Kim, Hoyoung; Kim, Soo-Kil; Kim, Jae Jeong
- Issue Date
- Sep-2021
- Publisher
- WILEY
- Keywords
- cobalt phosphide; hydrogen economy; hydrogen evolution reaction; non-platinum group-metal catalyst; proton exchange membrane water electrolyzers
- Citation
- INTERNATIONAL JOURNAL OF ENERGY RESEARCH, v.45, no.11, pp 16842 - 16855
- Pages
- 14
- Journal Title
- INTERNATIONAL JOURNAL OF ENERGY RESEARCH
- Volume
- 45
- Number
- 11
- Start Page
- 16842
- End Page
- 16855
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/48592
- DOI
- 10.1002/er.6936
- ISSN
- 0363-907X
1099-114X
- Abstract
- The cost of platinum group metal (PGM) catalysts is one of the major obstacles in commercializing proton exchange membrane water electrolyzers (PEMWEs). The non-PGM substituents are often more financially beneficial but low in activity and durability in the acidic environment. In this study, cobalt phosphide catalysts, which are promising non-PGM alternatives for the hydrogen evolution reaction (HER) and have enhanced durability and single-cell performance, were fabricated directly on carbon paper using the pulse electrodeposition method. As the dissolution potential (reported as -x vs saturated calomel electrode) of the pulse electrodeposition shifted in the positive direction, the P/Co ratio of the Co-P-x catalysts increased because of severe Co dissolution. Among the catalysts, Co-P-0.6, Co-P-0.5, and Co-P-0.4 (where the number indicates the negative dissolution potential) were rapidly degraded in acid, whereas Co-P-0.3, Co-P-0.2, and Co-P-0.1 showed high stability because of the relative amounts of CoP and Co2P phases. The acid-dissolved Co-P-0.3 catalyst showed the best half-cell performance (an overpotential of 143.85 mV at 10 mA/cm(2)) and durability, and the P-Co and Co delta+ surface states are critical for its performance. Single-cell tests using the Co-P-0.3 cathode revealed its remarkable performance of 1.89 A/cm(2) at 2.0 V-cell, indicating its promise as a non-PGM cathode material for PEMWEs.
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