LaCoO₃ acting as an efficient and robust catalyst for photocatalytic water oxidation with persulfate

다국어 초록 (Multilingual Abstract)

<P>Cobalt-containing metal oxides [perovskites (LaCoO<SUB>3</SUB>, NdCoO<SUB>3</SUB>, YCoO<SUB>3</SUB>, La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>CoO<SUB>3</SUB>), spinel (Co<SUB>3</SUB>O<SUB>4</SUB>) and wolframite (CoWO<SUB>4</SUB>)] have been examined as catalysts for photocatalytic water oxidation with Na<SUB>2</SUB>S<SUB>2</SUB>O<SUB>8</SUB> and [Ru(bpy)<SUB>3</SUB>]<SUP>2+</SUP> 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. LaCoO<SUB>3</SUB>, which stabilizes Co(<SMALL>III</SMALL>) species in the perovskite structure, exhibited the highest catalytic activity in the photocatalytic water oxidation compared with CoWO<SUB>4</SUB>, Co<SUB>3</SUB>O<SUB>4</SUB> and La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>CoO<SUB>3</SUB> which contain Co(<SMALL>II</SMALL>) or Co(<SMALL>IV</SMALL>) species in the matrices. The high catalytic reactivity of LaCoO<SUB>3</SUB> possessing perovskite structure was maintained in NdCoO<SUB>3</SUB> and YCoO<SUB>3</SUB> which exclusively contain Co(<SMALL>III</SMALL>) 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.</P>

<P>Graphic Abstract</P><P>Co-containing metal oxides were used as catalysts for photocatalytic water oxidation. Among them LaCoO<SUB>3</SUB> exhibited the highest catalytic activity, upon being used repeatedly without losing the catalytic activity.
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