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Platinum Multicubes Prepared by Ni 2+ ‐Mediated Shape Evolution Exhibit High Electrocatalytic Activity for Oxygen Reduction
Author(s) -
Ma Liang,
Wang Chengming,
Xia Bao Yu,
Mao Keke,
He Jiawei,
Wu Xiaojun,
Xiong Yujie,
Lou Xiong Wen David
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201500947
Subject(s) - facet (psychology) , catalysis , oxygen reduction , platinum , oxygen reduction reaction , oxygen , materials science , chemical engineering , electrocatalyst , chemistry , nanotechnology , electrode , electrochemistry , organic chemistry , psychology , social psychology , personality , engineering , big five personality traits
Pt(100) facets are generally considered less active for the oxygen reduction reaction (ORR). Reported herein is a unique Pt‐branched structure, a multicube, whose surface is mostly enclosed by {100} facets but contains high‐index facets at the small junction area between the adjacent cubic components. The synthesis is accomplished by a Ni 2+ ‐mediated facet evolution from high‐index {311} to {100} facets on the frameworks of multipods. Despite the high {100} facet coverage, the Pt multicubes exhibit impressive ORR activity in terms of half‐wave potential and current density nearly to the level of the most active Pt‐based catalysts, while the durability of catalysts is well retained. The facet evolution creates a set of samples with tunable ratios of high‐index to low‐index facets. The results reveal that the excellent ORR performance of Pt multicubes is a combined result of active sites by high‐index facets and low resistance by flat surface. It is anticipated that this work will offer a new approach to facet‐controlled synthesis and ORR catalysts design.