DOI: 10.1016/j.jcou.2017.12.008
Scopus记录号: 2-s2.0-85038101045
论文题名: Photoelectrocatalytic performance of nanostructured p-n junction NtTiO2/NsCuO electrode in the selective conversion of CO2 to methanol at low bias potentials
作者: Brito J.F.D. ; Hudari F.F. ; Zanoni M.V.B.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2018
卷: 24 起始页码: 81
结束页码: 88
语种: 英语
英文关键词: CO2 reduction
; Methanol formation
; Nanostructured NtTiO2/NsCuO semiconductor
; p-n junction
; Photoelectrocatalysis mechanism
Scopus关键词: Carbon dioxide
; Charge transfer
; Copper compounds
; Copper oxides
; Electrodes
; Electrolytes
; Electromagnetic wave absorption
; Heterojunctions
; Light absorption
; Methanol
; Nanostructured materials
; Potash
; Titanium compounds
; Titanium dioxide
; Yarn
; CO2 reduction
; Methanol formations
; Nano-structured
; P-n junction
; Photo-electrocatalysis
; Semiconductor junctions
英文摘要: Aiming a selective reduction of CO2 to methanol, a p-n junction semiconductor was constructed based on CuO nanospheres (NsCuO) deposited at TiO2 nanotubes (NtTiO2). The NtTiO2/NsCuO material demonstrated smaller charge transfer resistance, smaller flat band potential and wider optical absorption when compared with NtTiO2 and/or Ti/TiO2 nanoparticles coated by higher size particles of CuO (Ti/TiO2/CuO). The selective reduction of dissolved CO2 to methanol was promoted at lower potential of +0.2 V and UV–vis irradiation in 0.1 mol L−1 K2SO4 electrolyte pH 8 with 57% of faradaic efficiency. Even though the performance of the nanostructured material NtTiO2/NsCuO was similar to the non-completely nanostructured material Ti/TiO2/CuO (0.1 mmol L−1 methanol), the conversion to methanol has been significantly increased when hydroxyls (0.62 mmol L−1) and holes scavengers (0.71 mmol L−1), such as p-nitrosodimethylaniline (RNO) or glucose, respectively, were added in the supporting electrolyte. It indicates that photogenerated electron/hole pairs are spatially separated on p-n junction electrodes, which produces effective electrons and long-life holes, influencing the products formed in the reaction. A schematic representation of the heterojunction effect on the photoelectrocatalytic CO2 reduction is proposed under the semiconductor and each supporting electrolyte, which improves the knowledge about the subject. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111929
Appears in Collections: 气候减缓与适应
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作者单位: São Paulo State University (UNESP), Institute of Chemistry, R. Francisco Degni 55, Araraquara, SP 14800-060, Brazil
Recommended Citation:
Brito J.F.D.,Hudari F.F.,Zanoni M.V.B.. Photoelectrocatalytic performance of nanostructured p-n junction NtTiO2/NsCuO electrode in the selective conversion of CO2 to methanol at low bias potentials[J]. Journal of CO2 Utilization,2018-01-01,24