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Super‐Exchange Interaction Induced Overall Optimization in Ferromagnetic Perovskite Oxides Enables Ultrafast Water Oxidation
Author(s) -
Dai Jie,
Zhu Yinlong,
Yin Yichun,
Tahini Hassan A.,
Guan Daqin,
Dong Feifei,
Lu Qian,
Smith Sean C.,
Zhang Xiwang,
Wang Huanting,
Zhou Wei,
Shao Zongping
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201903120
Subject(s) - overpotential , oxygen evolution , perovskite (structure) , electrocatalyst , materials science , oxide , water splitting , catalysis , chemical engineering , electrochemistry , inorganic chemistry , nanotechnology , chemistry , electrode , metallurgy , biochemistry , photocatalysis , engineering
Oxygen evolution reaction (OER) is crucial in many renewable electrochemical technologies including regenerative fuel cells, rechargeable metal–air batteries, and water splitting. It is found that abundant active sites with favorable electronic structure and high electrical conductivity play a dominant role in achieving high electrocatalytic efficiency of perovskites, thus efficient strategies need to be designed to generate multiple beneficial factors for OER. Here, highlighted is an unusual super‐exchange effect in ferromagnetic perovskite oxide to optimize active sites and enhance electrical conductivity. A systematic exploration about the composition‐dependent OER activity in SrCo 1 x Ru x O 3− δ (denoted as SCR x ) ( x = 0.0–1.0) perovskite is displayed with special attention on the role of super‐exchange interaction between high spin (HS) Co 3+ and Ru 5+ ions. Induced by the unique Co 3+ –O–Ru 5+ super‐exchange interactions, the SCR0.1 is endowed with abundant OER active species including Co 3+ /Co 4+ , Ru 5+ , and O 2 2− /O − , high electrical conductivity, and metal–oxygen covalency. Benefiting from these advantageous factors for OER electrocatalysis, the optimized SCR0.1 catalyst exhibits a remarkable activity with a low overpotential of 360 mV at 10 mA cm −2 , which exceeds the benchmark RuO 2 and most well‐known perovskite oxides reported so far, while maintaining excellent durability. This work provides a new pathway in developing perovskite catalysts for efficient catalysis.