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

doi:10.7503/cjcu20130843

Abstract

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

CLC Number:

O644

TrendMD:

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

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

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