Abstract

A combinatorial approach has been carried out to systematically investigate visible-light responsiveness of Fe-Ti-M (M: various metal elements) oxides for photoelectrochemical water splitting. Among the 25 elements tested, strontium was the most effective. A ternary metal oxide with the composition Fe(86.1)Ti(9.6)Sr(4.3)O(x) has been identified as a new lead structure for a visible-light responsive, n-type semiconductor. We have conducted various kinds of characterization of the Fe-Ti-Sr oxide semiconductor and discussed the reason why Sr in the Fe-Ti oxide gave the highest photocurrent.

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