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Low‐Coordinate Iridium Oxide Confined on Graphitic Carbon Nitride for Highly Efficient Oxygen Evolution
Author(s) -
Chen Jiayi,
Cui Peixin,
Zhao Guoqiang,
Rui Kun,
Lao Mengmeng,
Chen Yaping,
Zheng Xusheng,
Jiang Yinzhu,
Pan Hongge,
Dou Shi Xue,
Sun Wenping
Publication year - 2019
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.201907017
Subject(s) - catalysis , iridium , oxygen evolution , graphitic carbon nitride , heterojunction , oxide , nitride , chemical engineering , materials science , oxygen , chemistry , superhydrophilicity , nanoparticle , nanotechnology , photocatalysis , photochemistry , electrochemistry , optoelectronics , biochemistry , organic chemistry , electrode , layer (electronics) , engineering , wetting , metallurgy
Highly active and durable electrocatalysts for the oxygen evolution reaction (OER) is greatly desired. Iridium oxide/graphitic carbon nitride (IrO 2 /GCN) heterostructures are designed with low‐coordinate IrO 2 nanoparticles (NPs) confined on superhydrophilic highly stable GCN nanosheets for efficient acidic OER. The GCN nanosheets not only ensure the homogeneous distribution and confinement of IrO 2 NPs but also endows the heterostructured catalyst system with a superhydrophilic surface, which can maximize the exposure of active sites and promotes mass diffusion. The coordination number of Ir atoms is decreased owing to the strong interaction between IrO 2 and GCN, leading to lattice strain and increment of electron density around Ir sites and hence modulating the attachment between the catalyst and reaction intermediates. The optimized IrO 2 /GCN heterostructure delivers not only by far the highest mass activity among the reported IrO 2 ‐based catalysts but also decent durability.