•  
  •  
 

Corresponding Author

Wen-hua LENG(lengwh@zju.edu.cn)

Abstract

Semiconductor photocatalysis plays a critical role in the environment protection and future energy development. (Photo)electrochemical measurements are powerful tools for studying the kinetics and mechanism of photocatalytic reactions, since photo-carriers, as reactants of photocatalytic reactions, are involved in the interfacial transfer and recombination of semiconductor/electrolyte interface. This review describes the part of our recent results regarding aqueous photocatalytic decontamination obtained by these methods, and the focus of future work in this field is suggested.

Graphical Abstract

Keywords

photocatalysis, reaction kinetics and mechanism, electrochemical impedance spectroscopy, photoelectrochemistry

Publication Date

2013-10-28

Online Available Date

2013-03-18

Revised Date

2013-03-18

Received Date

2012-12-25

References

[1] Fujishima A, Honda K. Electrochemical photolysis of water at a semiconductor electrode[J]. Nature, 1972, 238(5358): 37-38.

[2] Chen C, Ma W, Zhao J. Semiconductor-mediated photodegradation of pollutants under visible-light irradiation[J]. Chemical Society Reviews, 2010, 39(11): 4206-4219.

[3] Hoffmann M R, Martin S T, Choi W, et al. Environmental applications of semiconductor photocatalysis[J]. Chemical Reviews, 1995, 95(1): 69-96.

[4] Leng W H, Zhang Z, Zhang J Q, et al. Investigation of the kinetics of a TiO2 photoelectrocatalytic reaction involving charge transfer and recombination through surface states by electrochemical impedance spectroscopy[J]. Journal of Physical Chemistry B, 2005, 109(31): 15008-15023.

[5] Cowan A J, Tang J, Leng W, et al. Water splitting by nanocrystalline TiO2 in a complete photoelectrochemical cell exhibits efficiencies limited by charge recombination[J]. Journal of Physical Chemistry C, 2010, 114(9): 4208-4214.

[6] Leng W H, Barnes P R F, Juozapavicius M, et al. Electron diffusion length in mesoporous nanocrystalline TiO2 photoelectrodes during water oxidation[J]. Journal of Physical Chemistry Letters, 2010, 1(6): 967-972.

[7] Hagfeldt A, Graetzel M. Light-induced redox reactions in nanocrystalline systems[J]. Chemical Reviews, 1995, 95(1): 49-68.

[8] Cheng X F, Leng W H, Liu D P, et al. Electrochemical preparation and characterization of surface-fluorinated TiO2 nanoporous film and its enhanced photoelectrochemical and photocatalytic properties[J]. Journal of Physical Chemistry C, 2008, 112(23): 8725-8734.

[9] Barnes P R F, Anderson A Y, Durrant J R, et al. Simulation and measurement of complete dye sensitised solar cells: Including the influence of trapping, electrolyte, oxidised dyes and light intensity on steady state and transient device behaviour[J]. Physical Chemistry Chemical Physics, 2011, 13(13): 5798-5816.

[10] Leng W H, Zhang Z, Cheng S A, et al. Estimation of photoelectrocatalytic activity of titanium oxide film electrodes by ac impedance[J]. Chinese Chemical Letters, 2001, 12(11): 1019-1022.

[11] Fei H, Leng W, Li X, et al. Photocatalytic oxidation of arsenite over TiO2: Is superoxide the main oxidant in normal air-saturated aqueous solutions?[J]. Environmental Science & Technology, 2011, 45(10): 4532-4539.

[12] Leng W, Fei H, Zhang J. Response to comment on "photocatalytic oxidation of arsenite over TiO2: Is superoxide the main oxidant in normal air-saturated aqueous solutions?"[J]. Environmental Science & Technology, 2011, 45(22): 9818-9819.

[13] Leng W H, Li X, Fei H, et al. Comment on "photocatalytic oxidation mechanism of as(III) on TiO2: Unique role of as(iii) as a charge recombinant species"[J]. Environmental Science & Technology, 2011, 45(5): 2028-2029.

[14] Leng W H, Cheng X F, Zhang J Q, et al. Comment on "photocatalytic oxidation of arsenite on TiO2: Understanding the controversial oxidation mechanism involving superoxides and the effect of alternative electron acceptors"[J]. Environmental Science & Technology, 2007, 41(17): 6311-6312.

[15] Li X, Leng W. Highly enhanced dye sensitized photocatalytic oxidation of arsenite over TiO2 under visible light by I? as an electron relay[J]. Electrochemistry Communictions, 2012, 22(0): 185-188.

[16] Li X, Leng W. Regenerated dye-sensitized photocatalytic oxidation of arsenite over nanostructured TiO2 films under visible light in normal aqueous solutions: An insight into the mechanism by simultaneous (photo)electrochemical measurements[J]. Journal of Physical Chemistry C, 2013, 117(2): 750-762.

Share

COinS
 
 

To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.