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Fundamental problems of water splitting at cadmium sulfide

✍ Scribed by D. Meissner; R. Memming; B. Kastening; D. Bahnemann

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
420 KB
Volume
127
Category
Article
ISSN
0009-2614

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✦ Synopsis

Oxygen is directly involved in the anodic photocorrosion of CdS leading to sulfate formation according to the overall reaction CdS + 4hf + 2H,O + 0, -B Cd2+ + SOi-+4H+. Sulfate formation leads to cleaning of the CdS surface from elemental sulfur and therefore improves the electrode behaviour dramatically. Removal of sulfur from the surface shifts the flatband potential of CdS to about -1.7 V(SCE) and the valence-band edge to -0.6 V(SCE). Accordingly holes lose their thermodynamic capability to oxidise water.

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✍ J. Kuczynski; J.K. Thomas πŸ“‚ Article πŸ“… 1982 πŸ› Elsevier Science 🌐 English βš– 212 KB

Pulsed laser studlcs of surhctant stablbzcd CdS coUolds mdlcate a rapld (< 10sg s) c-transfer from CdS to mctbyl-v~ologcn adsorbed on the collolds A rapId (== 10m6 s) subscqucnt back rcnction of some of the reduced methylvtologcn IS observed. PH. solute concentnt~on. etc., affect tbc reactron.