Synthesis and Demonstration of Subnanometric iridium Oxide as Highly Efficient and Robust Water Oxidation Catalyst

doi:10.1021/acscatal.7b02082

	Synthesis and Demonstration of Subnanometric iridium Oxide as Highly Efficient and Robust Water Oxidation Catalyst
	Guan, Jingqi 1; Li, Deng 1; Si, Rui 2; Miao, Shu 1; Zhang, Fuxiang 1; Li, Can 1
刊名	ACS CATALYSIS
	2017-09-01
卷号	7 期号:9 页码:5983-5986
关键词	Water Oxidation Electrocatalysis Density Functional Calculations Iridium Oxide Subnanometer
ISSN号	2155-5435
DOI	10.1021/acscatal.7b02082
文献子类	Article
英文摘要	Development of a highly efficient and robust water oxidation catalyst (WOC) with reduced usage of noble metals is extremely crucial for water splitting and CO, reduction by photocatalysis or electrolysis. Herein, we synthesized subnanometric iridium dioxide clusters supported on multiwalled carbon nanotubes (MWCNTs) by a chemical vapor deposition method (nominated as IrO2/CNT). Benefiting from a mild oxidation process in air at 303 K, the deposited iridium clusters can be controlled to have a narrow size distribution from several atoms to 2 nm, having an average size of ca. 1.1 nm. The subnanometric iridium-containing sample is demonstrated to be highly efficient and robust for water oxidation. The optimal turnover frequency (TOF) of chemical water oxidation on the as-obtained sample can reach 11.2 s(-1), and the overpotential of electrochemical water oxidation is 249, and 293 mV at 10 mA cm(-2) in 1.0 M KOH (pH: 13.6), and 0.5 M H2SO4 (pH: 0), respectively. On the basis of the structural characterizations and theory simulation, the extraordinary performances of the ultrasmall iridium dioxide are proposed to mainly originate from enhanced number of unsaturated surface Ir atoms and change of local coordination environment. Our work highlights the importance of subnanometric size of iridium dioxide in water oxidation.
WOS关键词	OXYGEN EVOLUTION REACTION ; METAL-OXIDES ; THIN-FILMS ; IRO2 FILMS ; DEPOSITION ; ELECTROCATALYSTS
WOS研究方向	Chemistry
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000410005700046
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/168316]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
通讯作者	Zhang, Fuxiang; Li, Can
作者单位	1.Chinese Acad Sci, Dalian Natl Lab Clean Energy, State Key Lab Catalysis, iChEM,Dalian Inst Chem Phys, Dalian 116023, Peoples R China 2.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201204, Peoples R China
推荐引用方式 GB/T 7714	Guan, Jingqi,Li, Deng,Si, Rui,et al. Synthesis and Demonstration of Subnanometric iridium Oxide as Highly Efficient and Robust Water Oxidation Catalyst[J]. ACS CATALYSIS,2017,7(9):5983-5986.
APA	Guan, Jingqi,Li, Deng,Si, Rui,Miao, Shu,Zhang, Fuxiang,&Li, Can.(2017).Synthesis and Demonstration of Subnanometric iridium Oxide as Highly Efficient and Robust Water Oxidation Catalyst.ACS CATALYSIS,7(9),5983-5986.
MLA	Guan, Jingqi,et al."Synthesis and Demonstration of Subnanometric iridium Oxide as Highly Efficient and Robust Water Oxidation Catalyst".ACS CATALYSIS 7.9(2017):5983-5986.