A kinetic study of CdS photocorrosion by intensity modulated photocurrent and photoelectrochemical impedance spectroscopy

DJ Fermin, EA Ponomarev, LM Peter*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

Abstract

The steady state and dynamic photoelectrochemical behaviour of single crystal cadmium sulfide in non-stabilising electrolytes has been compared with the response of the same electrode in the hole scavenging electrolyte Na,SO,. The kinetics of the elementary steps involved in photo-dissolution have been investigated by intensity modulated photocurrent spectroscopy (IMPS) and photoelectrochemical impedance spectroscopy (PEIS). The theoretical PEIS responses for a two hole transfer process have been derived and related to the corresponding theoretical IMPS responses. PEIS and IMPS data as well as the steady state photocurrent characteristics have been analysed within the framework of a model involving hole capture to form a surface bound intermediate species. The effects of the accumulation of this species on the steady state and dynamic response of the electrode are discussed. (C) 1999 Elsevier Science S.A. All rights reserved.

Original languageEnglish
Pages (from-to)192-203
Number of pages12
JournalJournal of Electroanalytical Chemistry
Volume473
Issue number1-2
Publication statusPublished - 8 Sep 1999
EventInternational Symposium on Electrochemistry of Ordered Interfaces, A Pre-Symposium of the 49th Annual Meeting of the ISE - SAPPORO, Japan
Duration: 11 Sep 199812 Sep 1998

Keywords

  • cadmium sulfide
  • impedance
  • intensity modulated photocurrent spectroscopy
  • photocorrosion
  • photoelectrochemistry
  • SEMICONDUCTOR ELECTRODES
  • SURFACE RECOMBINATION
  • CADMIUM-SULFIDE
  • HYDROGEN EVOLUTION
  • STEADY-STATE
  • DISSOLUTION
  • COMPETITION
  • INTERFACE
  • INP

Cite this