Platinum Multicubes Prepared by Ni2+-Mediated Shape Evolution Exhibit High Electrocatalytic Activity for Oxygen Reduction

Liang Ma, Chengming Wang, Bao Yu Xia, Keke Mao, Jiawei He, Xiaojun Wu, Yujie Xiong, Xiong Wen David Lou
2015 Angewandte Chemie  
Pt(100) facets are generally considered less active for the oxygen reduction reaction (ORR). Reported herein is au nique Pt-brancheds tructure,amulticube,w hose surface is mostly enclosed by {100} facets but contains high-index facets at the small junction area between the adjacent cubic components.T he synthesis is accomplished by aN i 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
more » ... t impressive ORR activity in terms of halfwave 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 as et of samples with tunable ratios of high-index to low-index facets.T he results reveal that the excellent ORR performance of Pt multicubes is ac ombined result of active sites by high-index facets and lowr esistance by flat surface.I ti sa nticipated that this work will offer an ew approach to facet-controlled synthesis and ORR catalysts design. Angewandte Chemie 5667
doi:10.1002/ange.201500947 fatcat:zu45hcvccrfwtevcap6wru6r2y