Light-Driven Water Oxidation with Metal Hexacyanometallate
Heterogeneous Catalysts
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Abstract
The catalytic activity of metal hexacyanometallates
(Prussian blue-type
coordination polymers) was tested in photoactivated water oxidation
by [Ru(2-2′-bpy)<sub>3</sub>]<sup>2+</sup>/persulfate system
at pH close to neutrality. This screening shows that manganese and
cobalt N-coordinated compounds are able to catalyze the oxygen evolution
reaction. Mn hexacyanometalates show low activity. Co hexacyanometalates,
in contrast, appear highly active and promote robust catalysis with
excellent quantum yield (≤88%), even in acidic media. Our results
indicate that these catalysts are viable candidates for a photoactivated
water oxidation process as part of an artificial photosynthesis scheme