Boosting Fuel Cell Durability under Shut-Down/Start-Up Conditions using Hydrogen Oxidation-Selective Metal-Carbon Hybrid Core-Shell Catalyst

Title
Boosting Fuel Cell Durability under Shut-Down/Start-Up Conditions using Hydrogen Oxidation-Selective Metal-Carbon Hybrid Core-Shell Catalyst
Authors
유성종최대일장정희Monika Sharma강윤식김용진민지호성후광정남기
Issue Date
2019-08
Publisher
ACS Applied Materials & Interfaces
Citation
VOL 11, NO 31-27742
Abstract
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 H2/O2 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 ∼1.5 V. Herein, to directly prevent the formation of H2/O2 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 H2 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.
URI
http://pubs.kist.re.kr/handle/201004/70866
ISSN
1944-8244
Appears in Collections:
KIST Publication > Article
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