Photoelectrochemical reaction behaviour of platinum disulphide with water and reducing agents

✍ Scribed by H. Tributsch; O. Gorochov

• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 665 KB
• Volume: 27
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(82)80006-6

✦ Synopsis

is a layer-type semkomiuctor (A& ?I 0.95 ev), similar to Moss or WSz, ia which photoexcitation aka produces holes in an energy band derived from transition metal d-states. There is consequently no anodic photo-corrosion leading to molecular sulphur, !&ce platinum cannot easily leave the clactroda 8urfW.e as a positive ion, the formation of metal sutpb+e is also inbibiti Tbc natin pboto oxidation product in contact with an aqueous electrolyte is therefore oxygm, anowing the formation of platinum complexes as a possible side reaction, which occurs in pfiwace of suitable compkxing agems. The investigation reveals that, during anodic pohuk~tion, the PtS, sutfpos w through &ffcmnt oxidation states which affect the potential drop ia the Hehnholtz-layer aad thus the flat band peteatiat ofGtc electrode. The photooxidation of redor systems also involves+ considerable ebsnges in the e&trode aurke which are reflected in or relativzly systematic stilt of photocurrents in depcmdareofthcledoxpotultialof the electrolvte. Valuable new scientific informations on photockztcoehcmical mechanisms can be obtained from this &tern.