Study of photoelectrochemical corrosion of lead oxide in alkaline solution by the rotating ring-disk electrode technique |
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Authors: | Maheshwar Sharon Susanta Ghosh |
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Institution: | (1) Department of Chemistry, Indian Institute of Technology, Bombay, Powai, Mumbai-400 076, India e-mail: sharon@chem.iitb.ernet.in, IN |
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Abstract: | Photoelectrochemical corrosion of n-type α-PbO electrodes in aqueous Fe(CN)6
3−/4− and I−/I3
− electrolytes using the rotating ring-disk electrode technique has been investigated. The α-PbO thin film is found to be more
stable in I−/I3
− (48%) than in Fe(CN)6
3−/4− electrolyte (10%). Preferential adsorption of iodide ions decreases the photocorrosion reaction of holes with α-PbO. Addition
of CsI (0.4 mM) to the I−/I3
− electrolyte decreases the photocorrosion from 48% to less than 10%. Cs+ ions perhaps nullify the effect of negatively charged surface states of α-PbO, thus minimizing the trapping of holes at the
surface of α-PbO and hence decrease the possibility of photocorrosion of lead oxide with holes.
Received: 30 June 1998 / Accepted: 20 April 1999 |
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Keywords: | Photoelectrochemistry Lead oxide photocorrosion Rotating ring-disk electrode Supporting electrolyte Cesium iodide |
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