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Surface Engineering of Perovskite Oxide for Bifunctional Oxygen Electrocatalysis
Author(s) -
Ou Gang,
Yang Cheng,
Liang Yuwei,
Hussain Naveed,
Ge Binghui,
Huang Kai,
Xu Yushuai,
Wei Hehe,
Zhang Ruoyu,
Wu Hui
Publication year - 2019
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.201800279
Subject(s) - bifunctional , electrocatalyst , oxygen evolution , materials science , perovskite (structure) , oxide , lithium (medication) , catalysis , nanoparticle , chemical engineering , oxygen , nanotechnology , surface engineering , inorganic chemistry , chemistry , electrochemistry , electrode , metallurgy , organic chemistry , medicine , engineering , endocrinology
Perovskite oxide, a low‐cost bifunctional oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) electrocatalyst, has acquired a rapidly growing research interest in the areas of energy conversion and storage, owing to its significant surface structure‐induced catalytic performance. Here, recent progress on the electrocatalytic performance of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3– δ (LSCF) is built by engineering its surface defect structure through a versatile, effective, and controllable lithium reduction strategy. It is established that the lithium reduction treatment causes the formation of a structurally disordered layer at the surface of LSCF nanoparticles. The treated nanoparticles demonstrate significantly enhanced OER and ORR performance, especially for 5 wt% lithium‐reduced LSCF, whose OER potential decreases from 1.66 to 1.55 V at current density of 10 mA cm −2 , and ORR onset potential increases from 0.70 to 0.84 V. This work provides the foundation for the optimization of catalytic performance of perovskite oxide (LSCF). Moreover, such defective materials are promising candidates for energy conversion and storage applications.