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Phase Engineering of Atomically Thin Perovskite Oxide for Highly Active Oxygen Evolution
Author(s) -
Li Qun,
Wu Jiabin,
Wu Tao,
Jin Hongrun,
Zhang Nian,
Li Jia,
Liang Wenxi,
Liu Meilin,
Huang Liang,
Zhou Jun
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202102002
Subject(s) - materials science , overpotential , perovskite (structure) , oxygen evolution , orthorhombic crystal system , oxide , tetragonal crystal system , phase (matter) , calcination , chemical engineering , nanotechnology , catalysis , graphene , density functional theory , electrochemistry , crystal structure , chemistry , crystallography , computational chemistry , organic chemistry , electrode , engineering , metallurgy
Ultrathin perovskite oxides with tailored crystal structures are promising catalysts for oxygen evolution reaction (OER) owing to their high intrinsic catalytic activity and large exposed active surface area. However, the synthesis of phase‐controllable perovskite oxide nanosheets with thickness down to a few nanometers remains a challenge since the formation of a perovskite phase often requires long‐time calcination at high temperatures. Here, a salt‐templated strategy for fabrication of atomically thin perovskite oxide of LaMnO 3 with tailored phase structure for highly active OER catalysts is reported. The orthorhombic structure of LaMnO 3 nanosheets demonstrates much higher electrochemical activity than the tetragonal or hexagonal phase and the benchmark IrO 2 catalyst, exhibiting extremely small onset overpotential (≈70 mV) and a low overpotential (≈324 mV at 10 mAcm − 2disk ) in alkaline solution. The remarkable OER activity of this catalyst is attributed to the desired surface binding energetics (or the unique electronic structures) inherent to the orthorhombic phase, as predicted by density functional theory calculations and confirmed by experimental measurements. Further, it is believed that this study paves a new path toward rational the design of perovskite oxide nanosheets with desired phase structures for many applications.