High-Performance Pyrochlore-Type Yttrium Ruthenate Electrocatalyst for Oxygen Evolution Reaction in Acidic Media | Zendy

Jaemin Kim | Zendy; Pei-Chieh Shih | Zendy; KaiChieh Tsao | Zendy; YungTin Pan | Zendy; Xi Yin | Zendy; Cheng-Jun Sun | Zendy; Hong Yang | Zendy

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

Author(s) -

Jaemin Kim,

Pei-Chieh Shih,

KaiChieh Tsao,

YungTin Pan,

Xi Yin,

Cheng-Jun Sun,

Hong Yang

Publication year - 2017

Publication title -

journal of the american chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 7.115

H-Index - 612

eISSN - 1520-5126

pISSN - 0002-7863

DOI - 10.1021/jacs.7b06808

Subject(s) - overpotential , chemistry , electrocatalyst , pyrochlore , oxygen evolution , yttrium , inorganic chemistry , water splitting , xanes , catalysis , electrochemistry , oxide , electrode , biochemistry , photocatalysis , physics , organic chemistry , quantum mechanics , spectroscopy , phase (matter)

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 2 Ru 2 O 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 2 Ru 2 O 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. The Y 2 Ru 2 O 7-δ pyrochlore is also free of expensive iridium metal and thus is a cost-effective candidate for practical applications.

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