Pulse-electrodeposited nickel phosphide for high-performance proton exchange membrane water electrolysis
- Authors
- Kim, Hoyoung; Park, Hyanjoo; Kim, Dong-Kwon; Choi, Insoo; Kim, Soo-Kil
- Issue Date
- May-2019
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Pulse electrodeposition; Hydrogen evolution reaction; Ni-P catalyst; High surface area; Composition; Proton exchange membrane water electrolysis
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v.785, pp 296 - 304
- Pages
- 9
- Journal Title
- JOURNAL OF ALLOYS AND COMPOUNDS
- Volume
- 785
- Start Page
- 296
- End Page
- 304
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/18050
- DOI
- 10.1016/j.jallcom.2019.01.192
- ISSN
- 0925-8388
1873-4669
- Abstract
- Ni-P catalysts with various compositions were fabricated by pulse electrodeposition in pursuit of highly efficient and durable hydrogen evolution via proton exchange membrane water electrolysis. Pulse electrodeposition enabled the preparation of a Ni-P catalyst with a high portion of P, thereby conferring acid-resistant properties to the catalyst. Specifically, precise control of the deposition potential made it possible to leach Ni from bulk Ni-P and thus to vary the composition. With greater P incorporation, the catalyst became amorphous. The activity of the as-prepared Ni-P catalysts for the hydrogen evolution reaction (HER) in acidic medium was evaluated by cyclic voltammetry, confirming the strong dependence of the activity on the composition. The Ni-P catalyst with a bulk composition of Ni78P22 exhibited the best HER activity with an overpotential of 105 mV at -10 mA cm(-2). The current density of the single cell with the electrodeposited Ni78P22 cathode and electrodeposited IrO2 anode was 1.31 A cm(-2) at 2.0 V-ce(ll). Compared to reported values for other non-Pt or Pt cathodes for electrolysis, the electrolyzer with the Ni78P22 cathode strongly outperforms the non-Pt cathodes, and the performance is more than a half of that of the Pt cathode. (C) 2019 Elsevier B.V. All rights reserved.
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