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Eliminating dissolution of platinum-based electrocatalysts at the atomic scale

Authorized Users Only
2020
Authors
Lopes, Pietro
Li, Dongguo
Lv, Haifeng
Wang, Chao
Tripković, Dušan
Zhu, Yisi
Schimmenti, Roberto
Daimon, Hideo
Kang, Yijin
Snyder, Joshua
Becknell, Nigel
More, Karren
Strmcnik, Dusan
Marković, Nenad M.
Mavrikakis, Manos
Stamenković, Vojislav
Article (Published version)
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Abstract
A remaining challenge for deployment of proton-exchange membrane fuel cells is thelimited durability of Pt-nanoscale materials that operate at high voltages during thecathodic oxygen reduction reaction. In this work, atomic-scale insight into well-definedsingle crystalline, thin-film, and nanoscale surfaces exposed Pt dissolution trends thatgoverned the design and synthesis of durable materials. A newly defined metric, intrinsicdissolution, is essential to understanding the correlation between the measured Pt loss,surface structure, size and ratio of Pt-nanoparticles in carbon support. It was found that utilization of Au underlayer promotes ordering of Pt surface atoms towards (111)- structure, while Au on the surface selectively protects low-coordinated Pt sites. Thismitigation strategy was applied towards 3 nm Pt3Au/C nanoparticles, resulting inelimination of Pt dissolution in liquid electrolyte, including 30-fold durability improvementvs. 3 nm Pt/C over extended potential range up t...o 1.2 V.

Keywords:
Electrocatalysis / Fuel cells / Materials for energy and catalysis
Source:
Nature Materials, 2020, 19, 1207-1214
Publisher:
  • Nature Publishing Group
Projects:
  • US Department of Energy (DOE), contract no. DE-AC02-06CH11357
  • US Department of Energy (DOE), grantant DE-FG02-05ER15731
  • US Department of Energy (DOE), contract no. DE-AC02-05CH11231
Note:
  • The peer-reviewed version of the article: https://cer.ihtm.bg.ac.rs/handle/123456789/3698

DOI: 10.1038/s41563-020-0735-3

ISSN: 1476-1122

PubMed: 32724187

WoS: 000550625800004

Scopus: 2-s2.0-85088264549
[ Google Scholar ]
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URI
https://cer.ihtm.bg.ac.rs/handle/123456789/3699
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