Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 31, Pages 27735-27742Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b06309
Keywords
durability; hydrogen oxidation reaction; polymer electrolyte membrane fuel cells; reverse current; selectivity
Funding
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry, and Energy (MOTIE) of the Republic of Korea [20173010032100]
- National Research Foundation of Korea (NRF) - Korean government (MIST) [2018M1A2A206197S, 2016M3A6A7945505, 2018R1C1B6007453, 2018M1A2A2061991, 2019R1A2B5B03004854]
- KIST Institutional Program
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Performance degradation generated by reverse current flow during fuel cell shut-down/start-up is a big challenge for commercialization of polymer electrolyte membrane fuel cells in automobile applications. Under transient operating conditions, the formation of H-2/O-2 boundaries on Pt surfaces and the occurrence of undesired oxygen reduction reaction (ORR) in an anode cause severe degradation of carbon supports and Pt catalysts in a cathode because of an increase of the cathode potential up to similar to 1.5 V. Herein, to directly prevent the formation of H-2/O-2 boundaries in the anode, we propose a unique metal-carbon hybrid core-shell anode catalyst having Pt nanoparticles encapsulated in nanoporous carbon shells for selective H-2 permeation. This hybrid catalyst exhibits high hydrogen oxidation reaction (HOR) selectivity along with fully subdued ORR activity during long-term operation because of the excellent stability of the carbon molecular sieves. Furthermore, the HOR-selective catalyst effectively suppresses the reverse current flow in a single cell under shut-down/start-up conditions.
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