Carbon Monoxide as a Promoter of Atomically Dispersed Platinum Catalyst in Electrochemical Hydrogen Evolution Reaction

Title
Carbon Monoxide as a Promoter of Atomically Dispersed Platinum Catalyst in Electrochemical Hydrogen Evolution Reaction
Authors
원다혜권한창김민호조성준정민욱김한솔Aleksandar R. ZeradjaninKarl J. J. Mayrhofer최민기김형준최창혁Jan-Philipp Grote
Keywords
Hydrogen evolution reaction; Platinum; single atom
Issue Date
2018-11
Publisher
Journal of the American Chemical Society
Citation
VOL 140, NO 47-16205
Abstract
Carbon monoxide is widely known to poison Pt during heterogeneous catalysis owing to its strong donor-acceptor binding ability. Herein, we report a counterintuitive phenomenon of this general paradigm when the size of Pt decreases to an atomic level, namely, the CO-promoting Pt electrocatalysis toward hydrogen evolution reactions (HER). Compared to pristine atomic Pt catalyst, reduction current on a CO-modified catalyst increases significantly. Operando mass spectroscopy and electrochemical analyses demonstrate that the increased current arises due to enhanced H-2 evolution, not additional CO reduction. Through structural identification of catalytic sites and computational analysis, we conclude that CO-ligation on the atomic Pt facilitates H-ads formation via water dissociation. This counterintuitive effect exemplifies the fully distinct characteristics of atomic Pt catalysts from those of bulk Pt, and offers new insights for tuning the activity of similar classes of catalysts.
URI
http://pubs.kist.re.kr/handle/201004/69339
ISSN
0002-7863
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KIST Publication > Article
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