Theoretical aspects of light activated semiconductor microelectrodes: A generalized analysis

Huanfeng Zhu, Barry Miller, Daniel Alberto Scherson

研究成果: Article査読

1 被引用数 (Scopus)

抄録

Theoretical aspects of light activated semiconductor (SC) microdisk electrodes in redox electrolytes have been examined as a function of the dimensionless photon flux σ and dimensionless bias potential ωbias. Dimensionless steady-state profiles for solid-state and solution phase species were obtained by solving self-consistently the transport equations and the electrostatic potential within the SC subject to the appropriate boundary conditions using COMSOL. Analyses of the results obtained revealed that for fixed σ and small ωbias, the local dimensionless flux at the interface normal to the SC surface, J Z(R,0), where R is the dimensionless radius normal to the axis of symmetry, is dominated by the oxidation process in the illuminated region (R≤1) and by the reduction process in the dark area near the edge of the illuminated region. For large ωbias, however, the oxidation process dominates JZ (R,0) everywhere along the interface. Agreeing with the phenomenon described in our earlier publication, the holes escape beyond R=1, yielding, for very large values of ωbias and σ, a total current flowing through the dark area that can exceed that collected within the illuminated disk.

本文言語English
ジャーナルJournal of the Electrochemical Society
157
10
DOI
出版ステータスPublished - 2010 9 7
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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