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Photoelectrochemical characteristics of metal-modified epitaxial n-Si anodes:Part I. NiO(OH)-coated n +/p-Si and n +/n-Si electrodes for catalytic oxygen evolution

Authors
Journal
Journal of Electroanalytical Chemistry
0022-0728
Publisher
Elsevier
Publication Date
Volume
227
Identifiers
DOI: 10.1016/0022-0728(87)80076-1
Disciplines
  • Chemistry

Abstract

Abstract The photoelectrochemical characteristics of nickel-modified epitaxial n-Si anodes in KOH solution were investigated. The results of XPS and Auger spectra and cyclic voltammetric curves show that the nickel-modified film was converted into amorphous Ni(OH) when the nickel-modified epitaxial n-Si anodes had been polarized. The photoelectrocatalytic oxygen evolution rate at n-Si with p/n or n +/n junction electrodes coated with NiO(OH) reached 160 mA/cm 2 under a light intensity of 80 mW/cm 2, and the photocurrent at constant potential was quite stable. These results could be attributed to an n +/p or n +/n structure and a Si/NiO(OH) hetero-junction, intensifying the separation of electron-hole pairs.

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