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

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.7b06808· OSTI ID:1375508
 [1];  [1];  [1];  [1];  [1];  [2]; ORCiD logo [1]
  1. Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana−Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
  2. X-ray Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States

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.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1375508
Alternate ID(s):
OSTI ID: 1421364
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 237 works
Citation information provided by
Web of Science

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