Question

The bandgap of a single material photocatalyst,being greater than the potential window sufficient condition for it to be used for electrolysis of water. true or false ​

Answer 1

Answer:

Yes, Its true.

For photo catalytic water splitting by the use of photo catalyst, the bandgap of semiconductor should be aligned to make the reaction more favorable which is oxidation and reduction reaction of water and this reaction depends on pH. Oxidation and reduction potential of water are +1.23ev and +0. For a reaction to proceed, the potential value should be high. Therefore, a bandgap should be greater than the 1.23V potential value.