Impact of ionomer adsorption on alkaline hydrogen oxidation activity and fuel cell performance

•Catalyst-ionomer interaction plays a critical role in the alkaline HOR.•The co-adsorption of cation-hydroxide-water causes the H2 diffusion issue.•The phenyl group adsorption blocks the active catalyst sites.•The proper design of catalysts and ionomers can mitigate catalyst poisoning. The adsorptio...

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Bibliographic Details
Published in:Current opinion in electrochemistry 2018-12, Vol.12, p.189-195
Main Authors: Li, Dongguo, Chung, Hoon T., Maurya, Sandip, Matanovic, Ivana, Kim, Yu Seung
Format: Article
Language:English
Subjects:
Energy Sciences
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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Summary:•Catalyst-ionomer interaction plays a critical role in the alkaline HOR.•The co-adsorption of cation-hydroxide-water causes the H2 diffusion issue.•The phenyl group adsorption blocks the active catalyst sites.•The proper design of catalysts and ionomers can mitigate catalyst poisoning. The adsorption of the ionomer components significantly impacts the activity of hydrogen oxidation reaction (HOR) catalysts under high pH conditions. Two specific adsorptions, i.e., (i) cation-hydroxide-water co-adsorption and (ii) phenyl group adsorption, on the surface of platinum group metal HOR catalysts were identified as the performance-limiting factors for anion-exchange membrane fuel cells (AEMFCs). Here, we review the main characteristics of the surface adsorptions, their impact on the performance of HOR half-cell and AEMFC, and the mitigation strategies. This review emphasizes important aspects in the design of electrocatalysts and ionomers for improved AEMFC performance.
ISSN:2451-9103
2451-9111
DOI:10.1016/j.coelec.2018.11.012