文献类型：期刊文献

英文题名：Locally-ordered PtNiPb ternary nano-pompons as efficient bifunctional oxygen reduction and methanol oxidation catalysts

作者：Cheng, Na[1];Zhang, Ling[1];Jiang, Hao[1];Zhou, Yingjie[1];Yu, Shengwei[1];Chen, Liyuan[1];Jiang, Haibo[1];Li, Chunzhong[1]

机构：[1]East China Univ Sci & Technol, Key Lab Ultrafine Mat, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn,Minist Educ, Shanghai 200237, Peoples R China

年份：2019

卷号：11

期号：36

起止页码：16945

外文期刊名：NANOSCALE

收录：;EI(收录号：20193907475364);WOS:【SCI-EXPANDED(收录号:WOS:000496763600025)】；

基金：This work was supported by the National Natural Science Foundation of China (21838003 and 91834301), the Shanghai Scientific and Technological Innovation Project (18JC1410600), the Social Development Program of Shanghai (17DZ1200900 and 18DZ2252400), the Innovation Program of Shanghai Municipal Education Commission, and the Fundamental Research Funds for the Central Universities (222201718002).

语种：英文

外文关键词：Density functional theory - Ternary alloys - Catalysts - Catalytic oxidation - Methanol - Binary alloys - Oxygen - Gas adsorption - Electrolytic reduction

摘要：To accurately control the composition and structure of Pt-based alloys is essential for engineering highly active and stable catalysts, yet challenging. Here, ternary PtNiPb nano pompons (NPs) combining the features of a highly open structure, local-ordering and the introduction of Pb have been synthesized via a seed-mediated growth method. Taking advantage of the reduction potential differences, gradient distribution of Pb and Ni throughout the NPs is realized, and both the elemental composition and distribution can be facilely regulated by reaction time. The PtNiPb NPs exhibit much enhanced catalytic performance for both the oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR), of which the ORR specific activity is 7.4- and 2.3-fold larger than those of the commercial Pt/C catalyst and binary PtNi NPs. Density functional theory (DFT) calculations reveal that the weak coupling between Pb-p and Pt-d orbitals together with the regulation of the over-compressed Pt surface by the local-ordering structure and embedded Pb atoms optimize the surface oxygen adsorption character and eventually boost the ORR.