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

Fingerprint

Microelectrodes
Electrolytes
electrolytes
Semiconductor materials
n-type semiconductors
Bias voltage
escape
high voltages
Electrostatics
solid solutions
Photons
Boundary conditions
Irradiation
electrostatics
boundary conditions
Fluxes
solid state
computer programs
irradiation
Geometry

ASJC Scopus subject areas

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

Cite this

Theoretical aspects of light-activated microelectrodes in redox electrolytes. / Zhu, Huanfeng; Miller, Barry; Scherson, Daniel Alberto.

In: Electrochemical and Solid-State Letters, Vol. 13, No. 2, 21.01.2010.

Research output: Contribution to journalArticle

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