title: Tuning selectivity of electrochemical reactions by atomically dispersed platinum catalyst.
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.
authors.affiliation: Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.|Department of Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Strasse 1, 40237 Düsseldorf, Germany.
authors.forename: Chang Hyuck
authors.initials: CH
authors.lastname: Choi
authors.affiliation: Graduate School of EEWS, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.
authors.forename: Minho
authors.initials: M
authors.lastname: Kim
authors.affiliation: Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.
authors.forename: Han Chang
authors.initials: HC
authors.lastname: Kwon
authors.affiliation: Department of Applied Chemical Engineering, Chonnam National University, Yongbong 300, Buk-gu, Gwangju 500-757, Korea.
authors.forename: Sung June
authors.initials: SJ
authors.lastname: Cho
authors.affiliation: Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.
authors.forename: Seongho
authors.initials: S
authors.lastname: Yun
authors.affiliation: Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.
authors.forename: Hee-Tak
authors.identifier: http://orcid.org/0000-0003-4578-5422
authors.initials: HT
authors.lastname: Kim
authors.affiliation: Department of Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Strasse 1, 40237 Düsseldorf, Germany.|Forschungszentrum Jülich, 'Helmholtz-Institut Erlangen-Nürnberg' (IEK 11), Nägelsbachstrasse 49b, 91052 Erlangen, Germany.
authors.forename: Karl J J
authors.initials: KJ
authors.lastname: Mayrhofer
authors.affiliation: Graduate School of EEWS, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.
authors.forename: Hyungjun
authors.initials: H
authors.lastname: Kim
authors.affiliation: Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.
authors.forename: Minkee
authors.initials: M
authors.lastname: Choi