Premium
A Porous Pyrochlore Y 2 [Ru 1.6 Y 0.4 ]O 7– δ Electrocatalyst for Enhanced Performance towards the Oxygen Evolution Reaction in Acidic Media
Author(s) -
Kim Jaemin,
Shih PeiChieh,
Qin Yao,
AlBardan Zaid,
Sun ChengJun,
Yang Hong
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201808825
Subject(s) - electrocatalyst , pyrochlore , oxygen evolution , perchloric acid , materials science , oxide , electrochemistry , catalysis , yttrium , porosity , ruthenium oxide , oxygen , inorganic chemistry , chemical engineering , electrode , chemistry , phase (matter) , biochemistry , organic chemistry , composite material , engineering , metallurgy
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 Ru 4+/5+ through the partial substitution of Ru 4+ with Y 3+ cations, leading to the formation of mixed B‐site Y 2 [Ru 1.6 Y 0.4 ]O 7− δ . This porous Y 2 [Ru 1.6 Y 0.4 ]O 7− δ 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 RuO 2 reference catalyst (5.41 s −1 ).