Low‐Coordinate Iridium Oxide Confined on Graphitic Carbon Nitride for Highly Efficient Oxygen Evolution. (7th August 2019)

• Record Type: Journal Article
• Authors: Chen, Jiayi; Cui, Peixin; Zhao, Guoqiang; Rui, Kun; Lao, Mengmeng; Chen, Yaping; Zheng, Xusheng; Jiang, Yinzhu; Pan, Hongge; Dou, Shi Xue; Sun, Wenping
• Is Part Of: Angewandte Chemie. Volume 131:Number 36(2019)
• Page Start: 12670
• Page End: 12674
• Publication Date: 2019-08-07
• Subjects: Elektrokatalyse -- Graphitisches Kohlenstoffnitrid -- Heterostrukturen -- Iridiumoxid -- Sauerstoffentwicklungsreaktion; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201907017
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Highly active and durable electrocatalysts for the oxygen evolution reaction (OER) is greatly desired. Iridium oxide/graphitic carbon nitride (IrO2 /GCN) heterostructures are designed with low‐coordinate IrO2 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 IrO2 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 IrO2 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 IrO2 /GCN heterostructure delivers not only by far the highest mass activity among the reported IrO2 ‐based catalysts but also decent durability. Abstract : IrO2 /GCN‐Heterostrukturen (GCN=graphitisches Kohlenstoffnitrid) mit einer Vielzahl unterkoordinierter Ir‐Zentren und superhydrophilen Oberflächen wurden für die schnelle und langlebige Sauerstoffentwicklung hergestellt. Das Ergebnis stellt eine effektive GCN‐basierte Heterostruktur‐Entwicklungsstrategie dar, mit der hoch aktive Elektrokatalysatoren hergestellt werden können.