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Title: High-Performance Pyrochlore-Type Yttrium Ruthenate Electrocatalyst for Oxygen Evolution Reaction in Acidic Media

Development of acid-stable electrocatalysts with low overpotential for oxygen evolution reaction (OER) is a major challenge to produce hydrogen directly from water. We report in this paper a pyrochlore yttrium ruthenate (Y 2Ru 2O 7-δ) electrocatalyst that has significantly enhanced performance toward OER in acid media over the best-known catalysts, with an onset overpotential of 190 mV and high stability in 0.1 M perchloric acid solution. X-ray absorption near-edge structure (XANES) indicates Y 2Ru 2O 7-δ electrocatalyst had a low valence state that favors the high OER activity. Density functional theory (DFT) calculation shows this pyrochlore has lower band center energy for the overlap between Ru 4d and O 2p orbitals and is therefore more stable Ru–O bond than RuO 2, highlighting the effect of yttrium on the enhancement in stability. Finally, the Y 2Ru 2O 7-δ pyrochlore is also free of expensive iridium metal and thus is a cost-effective candidate for practical applications.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ; ORCiD logo [1]
  1. Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Chemical and Biomolecular Engineering
  2. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Published Article
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 139; Journal Issue: 34; Journal ID: ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Research Org:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1375508
Alternate Identifier(s):
OSTI ID: 1421364

Kim, Jaemin, Shih, Pei-Chieh, Tsao, Kai-Chieh, Pan, Yung-Tin, Yin, Xi, Sun, Cheng-Jun, and Yang, Hong. High-Performance Pyrochlore-Type Yttrium Ruthenate Electrocatalyst for Oxygen Evolution Reaction in Acidic Media. United States: N. p., Web. doi:10.1021/jacs.7b06808.
Kim, Jaemin, Shih, Pei-Chieh, Tsao, Kai-Chieh, Pan, Yung-Tin, Yin, Xi, Sun, Cheng-Jun, & Yang, Hong. High-Performance Pyrochlore-Type Yttrium Ruthenate Electrocatalyst for Oxygen Evolution Reaction in Acidic Media. United States. doi:10.1021/jacs.7b06808.
Kim, Jaemin, Shih, Pei-Chieh, Tsao, Kai-Chieh, Pan, Yung-Tin, Yin, Xi, Sun, Cheng-Jun, and Yang, Hong. 2017. "High-Performance Pyrochlore-Type Yttrium Ruthenate Electrocatalyst for Oxygen Evolution Reaction in Acidic Media". United States. doi:10.1021/jacs.7b06808.
@article{osti_1375508,
title = {High-Performance Pyrochlore-Type Yttrium Ruthenate Electrocatalyst for Oxygen Evolution Reaction in Acidic Media},
author = {Kim, Jaemin and Shih, Pei-Chieh and Tsao, Kai-Chieh and Pan, Yung-Tin and Yin, Xi and Sun, Cheng-Jun and Yang, Hong},
abstractNote = {Development of acid-stable electrocatalysts with low overpotential for oxygen evolution reaction (OER) is a major challenge to produce hydrogen directly from water. We report in this paper a pyrochlore yttrium ruthenate (Y2Ru2O7-δ) electrocatalyst that has significantly enhanced performance toward OER in acid media over the best-known catalysts, with an onset overpotential of 190 mV and high stability in 0.1 M perchloric acid solution. X-ray absorption near-edge structure (XANES) indicates Y2Ru2O7-δ electrocatalyst had a low valence state that favors the high OER activity. Density functional theory (DFT) calculation shows this pyrochlore has lower band center energy for the overlap between Ru 4d and O 2p orbitals and is therefore more stable Ru–O bond than RuO2, highlighting the effect of yttrium on the enhancement in stability. Finally, the Y2Ru2O7-δ pyrochlore is also free of expensive iridium metal and thus is a cost-effective candidate for practical applications.},
doi = {10.1021/jacs.7b06808},
journal = {Journal of the American Chemical Society},
number = 34,
volume = 139,
place = {United States},
year = {2017},
month = {7}
}