Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 42, Pages 13877-13881Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201808825
Keywords
electrocatalysis; oxygen evolution reaction; porous metal oxides; pyrochlore; water splitting
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Funding
- University of Illinois
- U.S. DOE [DE-AC02-06CH11357]
- Canadian Light Source
- China Scholarship Council
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A robust porous structure is often needed for practical applications in electrochemical devices, such as fuel cells, batteries, and electrolyzers. While templating approach is useful for the preparation of porous materials in general, it is not effective for the synthesis of oxide-based electrocatalysts owing to the chemical instability of disordered porous materials thus created. Now the synthesis of phase-pure porous yttrium ruthenate pyrochlore oxide using an unconventional porogen of perchloric acid is presented. The lattice oxygen defects are formed by the mixed-valence state of Ru4+/5+ through the partial substitution of Ru4+ with Y3+ cations, leading to the formation of mixed B-site Y-2[Ru1.6Y0.4]O7-delta. This porous Y-2[Ru1.6Y0.4]O7-delta electrocatalyst exhibits a turnover frequency (TOF) of 560 s(-1) (at 1.5 V versus RHE) for the oxygen evolution reaction, which is two orders of magnitude higher than that of the RuO2 reference catalyst (5.41 s(-1)).
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