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Tungsten‐Doped L1 0 ‐PtCo Ultrasmall Nanoparticles as a High‐Performance Fuel Cell Cathode
Author(s) -
Liang Jiashun,
Li Na,
Zhao Zhonglong,
Ma Liang,
Wang Xiaoming,
Li Shenzhou,
Liu Xuan,
Wang Tanyuan,
Du Yaping,
Lu Gang,
Han Jiantao,
Huang Yunhui,
Su Dong,
Li Qing
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201908824
Subject(s) - catalysis , proton exchange membrane fuel cell , materials science , cathode , tungsten , nanoparticle , chemical engineering , intermetallic , doping , alloy , oxygen reduction reaction , sintering , nanotechnology , electrode , electrochemistry , chemistry , metallurgy , optoelectronics , organic chemistry , engineering
The commercialization of proton exchange membrane fuel cells (PEMFCs) relies on highly active and stable electrocatalysts for oxygen reduction reaction (ORR) in acid media. The most successful catalysts for this reaction are nanostructured Pt‐alloy with a Pt‐skin. The synthesis of ultrasmall and ordered L1 0 ‐PtCo nanoparticle ORR catalysts further doped with a few percent of metals (W, Ga, Zn) is reported. Compared to commercial Pt/C catalyst, the L1 0 ‐W‐PtCo/C catalyst shows significant improvement in both initial activity and high‐temperature stability. The L1 0 ‐W‐PtCo/C catalyst achieves high activity and stability in the PEMFC after 50 000 voltage cycles at 80 °C, which is superior to the DOE 2020 targets. EXAFS analysis and density functional theory calculations reveal that W doping not only stabilizes the ordered intermetallic structure, but also tunes the Pt‐Pt distances in such a way to optimize the binding energy between Pt and O intermediates on the surface.