Tuning selectivity of electrochemical reactions by atomically dispersed platinum catalyst

Chang Hyuck Choi, Minho Kim, Han Chang Kwon, Sung June Cho, Seongho Yun, Hee-Tak Kim, Karl J. J. Mayrhofer, Hyungjun Kim () and Minkee Choi ()
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Chang Hyuck Choi: Korea Advanced Institute of Science and Technology
Minho Kim: Graduate School of EEWS, Korea Advanced Institute of Science and Technology
Han Chang Kwon: Korea Advanced Institute of Science and Technology
Sung June Cho: Chonnam National University
Seongho Yun: Korea Advanced Institute of Science and Technology
Hee-Tak Kim: Korea Advanced Institute of Science and Technology
Karl J. J. Mayrhofer: Max-Planck-Institut für Eisenforschung GmbH
Hyungjun Kim: Graduate School of EEWS, Korea Advanced Institute of Science and Technology
Minkee Choi: Korea Advanced Institute of Science and Technology

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract Maximum atom efficiency as well as distinct chemoselectivity is expected for electrocatalysis on atomically dispersed (or single site) metal centres, but its realization remains challenging so far, because carbon, as the most widely used electrocatalyst support, cannot effectively stabilize them. Here we report that a sulfur-doped zeolite-templated carbon, simultaneously exhibiting large sulfur content (17 wt% S), as well as a unique carbon structure (that is, highly curved three-dimensional networks of graphene nanoribbons), can stabilize a relatively high loading of platinum (5 wt%) in the form of highly dispersed species including site isolated atoms. In the oxygen reduction reaction, this catalyst does not follow a conventional four-electron pathway producing H2O, but selectively produces H2O2 even over extended times without significant degradation of the activity. Thus, this approach constitutes a potentially promising route for producing important fine chemical H2O2, and also offers opportunities for tuning the selectivity of other electrochemical reactions on various metal catalysts.

Date: 2016
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DOI: 10.1038/ncomms10922

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