Effect of cathode ink formulation on the hydrogen crossover and cell performance of proton exchange membrane water electrolyzersopen access
- Authors
- Kang, Inku; Choi, Won-Jong; Jeong, Hwan Yeop; Lee, Chang Jin; So, Soonyong; Yu, Duk Man; Yoon, Sang Jun; Kang, Hongsuk; Kim, Dong-Won; Oh, Keun-Hwan
- Issue Date
- Sep-2024
- Publisher
- Elsevier B.V.
- Keywords
- Cathode catalyst layer; Hydrogen permeation rate; Hydrogen supersaturation concentration; Ionomer; Polytetrafluoroethylene; Proton exchange membrane water electrolyzer
- Citation
- Journal of Power Sources, v.614, pp 1 - 9
- Pages
- 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- Journal of Power Sources
- Volume
- 614
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/194938
- DOI
- 10.1016/j.jpowsour.2024.234978
- ISSN
- 0378-7753
1873-2755
- Abstract
- The permeation of H2 through the membranes of proton exchange membrane water electrolyzers (PEMWEs) is a critical safety concern because of the risk of explosion when H2 mixes with O2 at the anode and increases in concentration. In this study, we investigated the modification of the cathode catalyst layer in the membrane electrode assembly as a strategy for achieving the safe operation of PEMWEs. The effects of the polytetrafluoroethylene (PTFE) content and type of ionomer in the cathode catalyst layer on the dissolved H2 concentration, H2 crossover, and electrochemical performance were investigated. The lowest dissolved H2 concentration and H2 permeation rate were achieved when 8 wt% PTFE was used. Consequently, the H2 volume fraction in O2 at the anode was less than 0.88 %. Additionally, using the Nafion ionomer (D520, ion exchange capacity: 1 mmol g−1), H2 volume fractions of 1.27 % and 1.34 % were obtained at 0.08 and 5 A cm−2, respectively. These values are below the lower explosion limit of H2 in O2 (4 %), implying that the PEMWE can be safely operated in the low-to-high current density range under ambient pressure. These results provide key guidelines for the design of high-safety cathode catalyst layers for PEMWEs.
- Files in This Item
-
- Appears in
Collections - 서울 공과대학 > 서울 화학공학과 > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.