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Cited by 339

The DOI matches its Crossref record; 28 of the 28 references it cites were found in a registry or an index.

Hydrogen Peroxide Synthesis via Enhanced Two-Electron Oxygen Reduction Pathway on Carbon-Coated Pt Surface

Choi, Chang Hyuck, Kwon, Han Chang, Yook, Sunwoo, Shin, Hyeyoung, Kim, Hyungjun, Choi, Minkee·2014·The Journal of Physical Chemistry C

Abstract

Continuous on-site electrochemical production of hydrogen peroxide (H 2 O 2 ) can provide an attractive alternative to the present anthraquinone-based H 2 O 2 production technology. A major challenge in the electrocatalyst design for H 2 O 2 production is that O 2 adsorption on the Pt surface thermodynamically favors “side-on” configuration over “end-on” configuration, which leads to a dissociation of O–O bond via dominant 4-electron pathway. This prefers H 2 O production rather than H 2 O 2 production during the electrochemical oxygen reduction reaction (ORR). In the present work, we demonstrate that controlled coating of Pt catalysts with amorphous carbon layers can induce selective end-on adsorption of O 2 on the Pt surface by eliminating accessible Pt ensemble sites, which allows significantly enhanced H 2 O 2 production selectivity in the ORR. Experimental results and theoretical modeling reveal that 4-electron pathway is strongly suppressed in the course of ORR due to a thermodynamically unfavored end-on adsorption of O 2 (the first electron transfer step) with 0.54 V overpotential. As a result, the carbon-coated Pt catalysts show an onset potential of ∼0.7 V for ORR and remarkably enhanced H 2 O 2 selectivity up to 41%. Notably, the produced H 2 O 2 cannot access the Pt surface due to the steric hindrance of the coated carbon layers, and thus no significant H 2 O 2 decomposition via disproportionation/reduction reactions is observed. Furthermore, the catalyst shows superior stability without considerable performance degradation because the amorphous carbon layers protect Pt catalysts against the leaching and ripening in acidic operating conditions.

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Metadata

Authors
Choi, C. H., Kwon, H. C., Yook, S., Shin, H., Kim, H., & Choi, M.
Venue
The Journal of Physical Chemistry C
Published
2014-12-15
Volume
118
Issue
51
Pages
30063-30070
ISSN
  • 1932-7447 (ISSN-L)
  • 1932-7455
OpenAlex
W2320907518
Cited by
339
References
28
FWCI
2.95
Type
journal article
Language
en
Open access
closed

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