Function of cobalt and platinum on p-InP in the photoevolution of hydrogen from alkaline solutions

Goodman, C. E.; Wessels, B. W.
September 1986
Applied Physics Letters;9/29/1986, Vol. 49 Issue 13, p829
Academic Journal
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.


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