DOI: 10.1016/j.jcou.2016.04.002
Scopus记录号: 2-s2.0-84990855474
论文题名: Hierarchical TiO2 nanofibres as photocatalyst for CO2 reduction: Influence of morphology and phase composition on catalytic activity
作者: Reñones P. ; Moya A. ; Fresno F. ; Collado L. ; Vilatela J.J. ; De La Peña O'Shea V.A.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2016
卷: 15 语种: 英语
英文关键词: Artificial photosynthesis
; CO2 photoreduction
; Electrospinning
; Hierarchical TiO2 fibres
; Sol-gel
Scopus关键词: Carbon dioxide
; Catalyst activity
; Electrochemical impedance spectroscopy
; Electrospinning
; Fibers
; Grain boundaries
; Nanofibers
; Oxide minerals
; Oxygen vacancies
; Photocatalysts
; Reduction
; Sol-gel process
; Sol-gels
; Spinning (fibers)
; Annealing condition
; Artificial photosynthesis
; Electron hole recombination rate
; Hierarchical assemblies
; Photo-reduction
; Photocatalytic reduction
; Photoluminescence measurements
; Reduction activity
; Titanium dioxide
英文摘要: In this research work, the gas phase CO2 photocatalytic reduction using water as electron donor has been performed using hierarchical assemblies of mesoporous TiO2 1-D nanofibres synthesised by a combination of electrospinning and sol-gel methods. In order to compare the effect of the crystallisation step on oxygen vacancies and conductivity, two different annealing conditions have been undertaken: under a high Ar flow ("TiO2 Fibres-A" sample) and under static Ar ("TiO2 Fibres B" sample). Moreover, these materials have been compared with individualised TiO2 nanoparticles prepared by a sol-gel procedure. CO and H2 are detected as major products with all photocatalysts, with lower amounts of CH4 and CH3OH. The TiO2 nanofibres exhibit better results than the sol-gel photocatalyst, behaviour that may be ascribed to an improved nanocrystals connection, which favours a fast charge transport along the grain boundaries, as measured by electrochemical impedance spectroscopy (EIS). The highest CO2 reduction activity is achieved with the TiO2 Fibres B catalyst, which gives rise to ca. 4 and 2.5 times higher H2 and CO production, respectively, than the TiO2 Fibres-A one. This sample is composed of a mixture of anatase and rutile crystalline phases (80:20), leading to a decrease in the electron-hole recombination rate observed by photoluminescence (PL) measurements. © 2016 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52893
Appears in Collections: 影响、适应和脆弱性
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Recommended Citation:
Reñones P.,Moya A.,Fresno F.,et al. Hierarchical TiO2 nanofibres as photocatalyst for CO2 reduction: Influence of morphology and phase composition on catalytic activity[J]. Journal of CO2 Utilization,2016-01-01,15