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Smart Control of Composition for Double Perovskite Electrocatalysts toward Enhanced Oxygen Evolution Reaction
Author(s) -
Sun Hainan,
Xu Xiaomin,
Chen Gao,
Zhou Yupeng,
Lin HongJi,
Chen ChienTe,
Ran Ran,
Zhou Wei,
Shao Zongping
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201902138
Subject(s) - overpotential , oxygen evolution , electrochemistry , perovskite (structure) , cathode , catalysis , materials science , chemical engineering , anode , water splitting , oxygen , inorganic chemistry , chemistry , electrode , biochemistry , organic chemistry , photocatalysis , engineering
Abstract Double perovskites have emerged as efficient candidates for catalyzing the electrochemical oxygen evolution reaction (OER). Smart control of the composition of a B‐site ordered double perovskite can lead to improved catalytic performance. By adopting a facile co‐doping strategy, the OER‐active elements are simultaneously introduced into the B‐site and B′‐site of a B‐site‐ordered double perovskite (A 2 BB′O 6 ), leading to an enhancement of the exposed reactive sites and an optimum surface chemical state. As a result, a model system built from the substitution of Co for Mo and Fe in the Sr 2 FeMoO 6− δ double perovskite (with a composition of Sr 2 Fe 0.8 Co 0.2 Mo 0.6 Co 0.4 O 6− δ ) shows significantly enhanced OER activity in alkaline media compared with the host material, requiring an overpotential of 345 mV to reach a 10 mA cm −2 current density (catalyst loading≈0.232 mg cat cm −2 GEO ) and a cell voltage of 1.57 V to afford the same current density for the overall water splitting when coupled with a Pt/C cathode (catalyst loading≈2 mg cm −2 ). It also demonstrates excellent electrochemical stability. The generalizability of the compositional control methodology has also been demonstrated in double perovskites incorporating transition metals other than Co (e.g., Ni).