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Citation: Zhang Guo-Dong. Photoelectrochemical Investigation of Passive film on Iron[J]. Acta Physico-Chimica Sinica, ;1991, 7(03): 366-370. doi: 10.3866/PKU.WHXB19910322 shu

Photoelectrochemical Investigation of Passive film on Iron

Zhang Guo-Dong

1.
Department of Chemical Engineering, East China Institute of Metallurgy, Maanshan 243002

Received Date: 24 October 1989
Available Online: 15 June 1991

The photoelectrochemical behavior of the passive film on iron in pH=8.4 borate buffer solution was investigated. The mechanism considered for the generation of the photocurrent in the passive film, and the principle of the measurement of photocurrent were discussed. The band model of noncrytalline semiconductor was used to demonstrate the depedence of photocurrent on electrode potential and light wavelength. Results indicate that the passive film formed on iron in pH=8.4 borate solution is a noncrystalline semiconductor, its flatband potential (φ_(fb)) is -0.30 V(SCE), band gap energy (E_g) is affected by measuring potential (φ_m), When +0.30 V<φ_m<+0.80 V (SCE), E_g is 1.9 eV.
- Passive film on iron; Semiconductor; Photoelectrochemical behavior; Photocurrent; Flatband potential
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