共存牺牲剂对染料敏化TiO2纳米晶体系电子传输的影响

doi:10.7503/cjcu20130843

高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (2): 351.doi: 10.7503/cjcu20130843

共存牺牲剂对染料敏化TiO₂纳米晶体系电子传输的影响

成荣敏¹, 李娜², 詹从红¹()

1. 吉林大学化学学院, 长春 130012
2. 材料科学与工程学院, 长春 130012

收稿日期:2013-08-30 出版日期:2014-02-10 发布日期:2013-12-05
作者简介:联系人简介: 詹从红, 男, 博士, 讲师, 主要从事染料敏化半导体催化剂研究. E-mail:zhanch@jlu.edu.cn
基金资助:
教育部留学回国人员科研启动基金资助

Influence of Co-existing Species on Charge Transfer in Dye-sensitized TiO₂ Nanocrystalline System^†

CHENG Rongmin¹, LI Na², ZHAN Conghong^1,^*()

1.College of Chemistry, Changchun 130012, China
2. College of Materials Science and Engineering, Jilin University, Changchun 130012, China

Received:2013-08-30 Online:2014-02-10 Published:2013-12-05
Contact: ZHAN Conghong E-mail:zhanch@jlu.edu.cn
Supported by:
† Supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry

摘要/Abstract

摘要：

采用卟啉染料敏化TiO₂纳米晶在可见光条件下(λ>390 nm)进行水分解制氢. 考察了不同牺牲剂——甲醇(MeOH)、三乙醇胺(TEOA)及其混合物对体系析氢效率的影响. 通过荧光猝灭及光电化学性能分析发现, 激发态染料与TiO₂之间的电子转移极大地受到添加的牺牲剂的影响, 而体系的pH值对其影响不大.

关键词: 光催化, 染料敏化, TiO2, 电子转移

Abstract:

Dye-sensitized nanocrystalline TiO₂ colloidal suspensions in aqueous system were applied for H₂ evolution under visible light(>390 nm). In these suspension systems, the efficiency of H₂ evolution is strongly influenced by the dye-sensitizers, a ruthenium complex, (n-Bu₄N)₂-cis-[Ru(dcbpy)(SCN)₂](N719, dcbpy=4,4'-dicarboxy-2,2'-bipyridine) and porphyrin derivatives 5,10,15,20-tetra(4-carboxyphenyl)porphyrin(TCPP) and tetra-(p-sulfonato phenyl) porphyrin(TPPS), and the combination with co-existing electron donor species, methanol(MeOH) and triethanolamine(TEOA). The analysis of fluorescence quenching and photoelectrochemical studies reveal that the charge transfer between the excited dye-sensitizers and TiO₂ is strongly influenced by the surroundings, especially the concentration of co-existing donor species rather than the pH values of the surrounding solution. It is benefit for achieving higher conversion efficiency for not only the photocatalysts but also the photovoltaics using dye-sensitized of TiO₂ nanoparticles.

Key words: Photocatalysis, Dye-sensitization, TiO2, Charge transfer

中图分类号:

O644

TrendMD:

成荣敏, 李娜, 詹从红. 共存牺牲剂对染料敏化TiO₂纳米晶体系电子传输的影响. 高等学校化学学报, 2014, 35(2): 351.

CHENG Rongmin, LI Na, ZHAN Conghong. Influence of Co-existing Species on Charge Transfer in Dye-sensitized TiO₂ Nanocrystalline System^†. Chem. J. Chinese Universities, 2014, 35(2): 351.

图/表 4

Fig.1 H2 evolution of dye-sensitized TiO2 nanoparticles in TEOA or MeOH aqueous solution under visible light(>390 nm)

Fig.2 Stern-Volmer plots of photoluminescence of TCPP and TPPS quenched by addition of TiO2 nanoparticles in TEOA and MeOH aqueous solutions(A) and relationship between I0/(I0-I) and [TiO2]-1 with linear fitting lines(B)

Fig.3 Influence of TEOA in solution on hydrogen evolution and quantum efficiency, Isurf/I0 of fluorescence of dye on TiO2 nanoparticles

Fig.4 Photocurrent-dark current response of N719 and TCPP on TiO2 in either TEOA(0.3 mol/L) or MeOH(6.2 mol/L) aqueous solutions revealing constant photocurrent(A) and photocu-rrent and photo-open-circuit potential of TCPP on TiO2 as a function of TEOA concentration revealing drastic change in the range of ca.0.001 mol/L of TEOA concentration(B)

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共存牺牲剂对染料敏化TiO₂纳米晶体系电子传输的影响

Influence of Co-existing Species on Charge Transfer in Dye-sensitized TiO₂ Nanocrystalline System^†

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