Influence of Electrolytes on the Photocathodic Protection Effect of TiO2 Nanotube Films for Stainless Steel

doi:10.7503/cjcu20130080

Abstract

Abstract:

The effect of the concentration and the variety of electrolytes(NaNO₃, NaCl, Na₂SO₄, Na₂S, NaOH) in a photoelectrolytic cell on photoelectrochemical properties of a TiO₂ nanotube film prepared by an anodic oxidation method was studied by photoelectrochemical measurements. The results show that the trend of different electrolytes for capturing photogenerated holes is Na₂S>NaOH>Na₂SO₄>NaCl>NaNO₃. Due to the synergistic effect of Na₂S and NaOH in a solution, when the concentrations of Na₂S and NaOH were both 0.5 mol/L, the photogenerated electron-hole pairs could be more effectively separated. The potential of 403 stainless steel in a 0.5 mol/L NaCl solution coupled with the TiO₂ film electrode in a 0.5 mol/L Na₂S+0.5 mol/L NaOH solution decreased by 650 mV under white-light irradiation, indicating the film could provide a good photocathodic protection effect on the steel by the assistance of the electrolyte solution. After the light was cut off, the 403 stainless steel also could be protected to a certain extent by the TiO₂ film.

Key words: TiO₂ nanotube film, Electrolyte, Hole scavenger, Photocathodic protection

CLC Number:

O646

TrendMD:

ZHANG Juan, ZHU Yan-Feng, GUO Ya, XU Lu, QI Hai-Qing, ZHOU Jian-Zhang, DU Rong-Gui, LIN Chang-Jian. Influence of Electrolytes on the Photocathodic Protection Effect of TiO₂ Nanotube Films for Stainless Steel[J]. Chem. J. Chinese Universities, 2013, 34(10): 2408.

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Influence of Electrolytes on the Photocathodic Protection Effect of TiO₂ Nanotube Films for Stainless Steel

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