气候变化领域集成服务门户(CCPortal): W-Doped TiO2for photothermocatalytic CO2reduction

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DOI	10.1039/d0nr03393f
	W-Doped TiO2for photothermocatalytic CO2reduction
	Li Y.; Walsh A.G.; Li D.; Do D.; Ma H.; Wang C.; Zhang P.; Zhang X.
发表日期	2020
ISSN	20403364
起始页码	17245
结束页码	17252
卷号	12 期号:33
英文摘要	TiO2 is one of the most widely used photocatalysts and photothermocatalysts. Tailoring their structure and electronic properties is crucial for the design of high-performance TiO2 catalysts. Herein, we report a strategy to significantly enhance the performance of TiO2 in the photothermocatalytic reduction of CO2 by doping high crystalline nano-TiO2 with tungsten. A variety of tungsten doping concentrations ranging from 2% to 10% were tested and they all showed enhanced catalytic activities. The 4% W-doped TiO2 exhibited the highest activity, which was 3.5 times greater than that of the undoped TiO2 reference. Structural characterization of these W-doped TiO2 catalysts indicated that W was successfully doped into the TiO2 lattice at relatively low dopant concentration. Synchrotron X-ray absorption spectroscopy at both the W L3- and Ti K-edges was further used to provide insight into the local structure and bonding properties of the catalysts. It was found that the replacement of Ti with W led to the formation of Ti vacancies in order to maintain the charge neutrality. Consequently, dangling oxygen and oxygen vacancies were produced that acted as catalytically active sites for the CO2 reduction. As the W doping concentration increased from 2% to 4%, more such active sites were generated which thus resulted in the enhancement of the catalytic activity. When the W doping concentration was further increased to 10%, the extra W species that cannot replace the Ti in the lattice aggregated to form WO3. Due to the lower conduction band of WO3, the catalytic O sites were deactivated and CO2 reduction was inhibited. This work presents a useful strategy for the development of highly efficient catalysts for CO2 reduction as well as new insights into the catalytic mechanism in cation-doped TiO2 photothermocatalysis. © The Royal Society of Chemistry.
scopus关键词	Carbon dioxide; Catalyst activity; Electronic properties; Oxide minerals; Titanium dioxide; Titanium metallography; Tungsten; Tungsten compounds; X ray absorption spectroscopy; Bonding property; Catalytic mechanisms; Charge neutrality; Dopant concentrations; Efficient catalysts; Enhanced catalytic activity; Structural characterization; Synchrotron x ray absorption spectroscopy; Titanium
来源期刊	Nanoscale
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176603
作者单位	Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, 130024, China; Department of Chemistry, Dalhousie University, Halifax, NS, Canada
推荐引用方式 GB/T 7714	Li Y.,Walsh A.G.,Li D.,et al. W-Doped TiO2for photothermocatalytic CO2reduction[J],2020,12(33).
APA	Li Y..,Walsh A.G..,Li D..,Do D..,Ma H..,...&Zhang X..(2020).W-Doped TiO2for photothermocatalytic CO2reduction.Nanoscale,12(33).
MLA	Li Y.,et al."W-Doped TiO2for photothermocatalytic CO2reduction".Nanoscale 12.33(2020).