The role of metal deposits (e.g., Co and Pt) on p-InP photocathodes in the photoevolution of hydrogen from alkaline solutions was studied. The deposition of Co or Pt on a p-InP photocathode was found to increase the solar-to-chemical efficiency by more than an order of magnitude. Photocurrent-voltage curves before and after metal deposition have shown that the open-circuit voltage remains nearly constant at 0.65-0.77 V. Under a reverse bias of 0.1-0.6 V the presence of metal islands has a large effect on cell performance by improving the short-circuit current and fill factor. This indicates that the deposited metals act as classical catalysts on photocathodes in alkaline hydrogen generating photoelectrochemical cells.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)