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Coplanar Pt/C Nanomeshes with Ultrastable Oxygen Reduction Performance in Fuel Cells
Author(s) -
Hu Yanmin,
Zhu Mengzhao,
Luo Xuan,
Wu Geng,
Chao Tingting,
Qu Yunteng,
Zhou Fangyao,
Sun Rongbo,
Han Xiao,
Li Hai,
Jiang Bin,
Wu Yuen,
Hong Xun
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202014857
Subject(s) - proton exchange membrane fuel cell , dissolution , catalysis , x ray photoelectron spectroscopy , materials science , current density , oxygen , density functional theory , carbon fibers , power density , electrode , analytical chemistry (journal) , chemistry , chemical engineering , organic chemistry , computational chemistry , power (physics) , physics , quantum mechanics , composite number , engineering , composite material
Developing highly stable and efficient catalysts toward the oxygen reduction reaction is important for the long‐term operation in proton exchange membrane fuel cells. Reported herein is a facile synthesis of two‐dimensional coplanar Pt‐carbon nanomeshes (NMs) that are composed of highly distorted Pt networks (neck width of 2.05±0.72 nm) and carbon. X‐ray absorption fine structure spectroscopy demonstrated the metallic state of Pt in the coplanar Pt/C NMs. Fuel cell tests verified the excellent activity of the coplanar Pt/C NM catalyst with the peak power density of 1.21 W cm −2 and current density of 0.360 A cm −2 at 0.80 V in the H 2 /O 2 cell. Moreover, the coplanar Pt/C NM electrocatalysts showed superior stability against aggregation, with NM structures preserved intact for a long‐term operation of over 30 000 cycles for electrode measurement, and the working voltage loss was negligible after 120 h in the H 2 /O 2 single cell operation. Density‐functional theory analysis indicates the increased vacancy formation energy of Pt atoms for coplanar Pt/C NMs, restraining the tendency of Pt dissolution and aggregation.