Photocatalytic proton reduction and water oxidation have been studied in a
tris(2,2’-bipyridyl)ruthenium complex-catalyst system. Pyrochlore-type oxides have been used as
proton reduction catalysts with a sacrificial electron donor (Na2EDTA) at pH 7 and as water
oxidation catalysts with a sacrificial electron acceptor (K2S2O8) at pH 3. Rate constants for the
proton reduction were estimated on the basis of photochemical processes. Yb2Ru2O7-δ was found to
be the most active catalyst for proton reduction and water oxidation catalyst in this system.
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