High-performance transition metal–doped Pt 3 Ni octahedra for oxygen reduction reaction

• DOI: 10.1126/science.aaa8765
• Publication Date: 2015-06-11T18:57:00Z
• Authors: Xiaoqing Huang; Zipeng Zhao; Liang Cao; Yu Chen; Enbo Zhu; Zhaoyang Lin; Mufan Li; Aiming Yan; Alex Zettl; Y. Morris Wang; Xiangfeng Duan; Tim Mueller; Yu Huang
• Keywords: Bimetallic strip; Oxidizing agent

Bimetallic platinum-nickel (Pt-Ni) nanostructures represent an emerging class of electrocatalysts for oxygen reduction reaction (ORR) in fuel cells, but practical applications have been limited by catalytic activity and durability. We surface-doped Pt3Ni octahedra supported on carbon with transition metals, termed M-Pt3Ni/C, where M is vanadium, chromium, manganese, iron, cobalt, molybdenum (Mo), tungsten, or rhenium. The Mo-Pt3Ni/C showed the best ORR performance, a specific 10.3 mA/cm(2) mass 6.98 A/mg(Pt), which are 81- 73-fold enhancements compared commercial Pt/C catalyst (0.127 0.096 A/mg(Pt)). Theoretical calculations suggest that Mo prefers subsurface positions near particle edges vacuum surface vertex/edge sites oxidizing conditions, it enhances both performance stability catalyst.