Abstract
In this paper, Raman spectra, photocurrent and the UV-VIS reflectance aremeasured for studying the α-Fe2O3 ultrafine particles adsorbed on Pt electrode. The blue shifts of Raman peaks demonstrate the size quantization effect for the particles of 50 nm in diameter ascompared with the bulk material. With the changing of the potential, the photocurrent decrcases as the UV-VIS reflectance increases, and vice-versa. Therefore, the potential not only affects the hargetransfer direcdtion in the interface of electrode/redox couple, but also influences the light absortion onthe surface of particles. According to the results of photoelectrochemistry, we suggest that the cathodic photocurrent in the potential range of more than negative 270 mV, and arises from a reduction process of the photo-induced oxidation product on the platinum substrate electrixle and the anodic one in the rangeof more than positive 270 mV, and arises from a directly photo-induced oxidation process on thesurface of partiles.
Keywords
Ultrafine particle, lron oxide, Photocurrent, Raman spectre, UV-VIS reflectance
Publication Date
1995-05-28
Online Available Date
1995-05-28
Revised Date
1994-11-21
Received Date
1994-06-27
Recommended Citation
Maizhi Yang, Yongjun Ji, Wen Zhang, Shengmin Cai, Xiaojiang Lu, Zhongqun Tian, Jin Luo.
Photoelectrochemical and Spectroelectrochemical Studies onIron Oxide Ultrafine Particles[J]. Journal of Electrochemistry,
1995
,
1(2): 146-151.
DOI: 10.61558/2993-074X.1275
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol1/iss2/3
Included in
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