Theoretical aspects of light-activated microelectrodes in redox electrolytes

Huanfeng Zhu, Barry Miller, Daniel Alberto Scherson

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The behavior of semiconductor-based, light-activated microelectrodes in redox electrolytes has been examined theoretically using commercial software to self-consistently solve the transport equations for solid-state and solution-phase species and the electrostatic potential within the semiconductor phase, subject to the appropriate boundary conditions under steady state. The light-limited currents for such spatially localized microelectrodes, observed for a high voltage bias, φbias, under normal irradiation and a strict axisymmetric geometry, were proportional to the photon flux intensity. The results of these simulations afforded strong evidence that under high φbias, holes generated by the light on an n-type semiconductor escape beyond the edge of the illuminated disk, leading to a net increase in the predicted current and thus in the effective area of the light-activated microelectrode.

Original languageEnglish
JournalElectrochemical and Solid-State Letters
Volume13
Issue number2
DOIs
Publication statusPublished - 2010 Jan 21
Externally publishedYes

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

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