文献类型：期刊文献

英文题名：Ordered Pt3Co Intermetallic Nanoparticles Derived from Metal-Organic Frameworks for Oxygen Reduction

作者：Wang, Xiao Xia[1,2];Hwang, Sooyeon[3];Pan, Yung-Tin[4];Chen, Kate[2];He, Yanghua[2];Karakalos, Stavros[5];Zhang, Hanguang[2];Spendelow, Jacob S.[4];Su, Dong[3];Wu, Gang[2]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Univ Buffalo State Univ New York, Dept Chem & Biol Engn, Buffalo, NY 14260 USA;[3]Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA;[4]Los Alamos Natl Lab, Mat Phys & Applicat Div, Los Alamos, NM 87545 USA;[5]Univ South Carolina, Dept Chem Engn, Columbia, SC 29208 USA

年份：2018

卷号：18

期号：7

起止页码：4163

外文期刊名：NANO LETTERS

收录：;EI(收录号：20182405316862);WOS:【SCI-EXPANDED(收录号:WOS:000439008300016)】；

基金：This work is financially supported from the start-up funding from the University at Buffalo, SUNY (G.W.) and U.S. DOE-EERE Fuel Cell Technologies Office (G.W. and J.S.S.). Electron microscopy research was conducted at the Center for Functional Nanomaterials at Brookhaven National Laboratory under Contract DE-SC0012704, which is DOE Office of Science User Facilities (D.S.). X.X.W. thanks the Shanghai Natural Science Foundation of China under Contract 16ZR1408600 and the Fundamental Research Funds for the Central Universities under Grant 222201814024.

语种：英文

外文关键词：Pt3Co intermetallic; oxygen reduction reaction; electrocatalysis; metal-organic frameworks; atomically dispersed Co

摘要：Highly ordered Pt alloy structures are proven effective to improve their catalytic activity and stability for the oxygen reduction reaction (ORR) for proton exchange membrane fuel cells. Here, we report a new approach to preparing ordered Pt3Co intermetallic nanoparticles through a facile thermal treatment of Pt nanoparticles supported on Co-doped metal-organic-framework (MOF)-derived carbon. In particular, the atomically dispersed Co sites, which are originally embedded into MOF-derived carbon, diffuse into Pt nanocrystals and form ordered Pt3Co structures. It is very crucial for the formation of the ordered Pt3Co to carefully control the doping content of Co into the MOFs and the heating temperatures for Co diffusion. The optimal Pt3Co nanoparticle catalyst has achieved significantly enhanced activity and stability, exhibiting a half-wave potential up to 0.92 V vs reversible hydrogen electrode (RHE) and only losing 12 mV after 30 000 potential cycling between 0.6 and 1.0 V. The highly ordered intermetallic structure was retained after the accelerated stress tests made evident by atomic-scale elemental mapping. Fuel cell tests further verified the high intrinsic activity of the ordered Pt3Co catalysts. Unlike the direct use of MOF-derived carbon supports for depositing Pt, we utilized MOF-derived carbon containing atomically dispersed Co sites as Co sources to prepare ordered Pt3Co intermetallic catalysts. The new synthesis approach provides an effective strategy to develop active and stable Pt alloy catalysts by leveraging the unique properties of MOFs such as 3D structures, high surface areas, and controlled nitrogen and transition metal dopings.