LaCoO3 acting as an efficient and robust catalyst for photocatalytic water oxidation with persulfate
Literature Information
Yusuke Yamada, Kentaro Yano, Dachao Hong
Cobalt-containing metal oxides [perovskites (LaCoO3, NdCoO3, YCoO3, La0.7Sr0.3CoO3), spinel (Co3O4) and wolframite (CoWO4)] have been examined as catalysts for photocatalytic water oxidation with Na2S2O8 and [Ru(bpy)3]2+ as an electron acceptor and a photosensitizer, respectively. Catalysts with the perovskite structure exhibited higher catalytic activity as compared with the catalysts with the spinel and wolframite structures. LaCoO3, which stabilizes Co(III) species in the perovskite structure, exhibited the highest catalytic activity in the photocatalytic water oxidation compared with CoWO4, Co3O4 and La0.7Sr0.3CoO3 which contain Co(II) or Co(IV) species in the matrices. The high catalytic reactivity of LaCoO3 possessing perovskite structure was maintained in NdCoO3 and YCoO3 which exclusively contain Co(III) species. Thus, the catalytic activity of Co ions can be controlled by the additional metal ions, which leads to development of highly reactive and robust catalysts for the photocatalytic water oxidation.
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