Abstract
The preparation of nanoparticulate RuO2 supported on mesoporous silica SBA-15 was optimized to achieve a uniform dispersion and confinement of RuO2. The supported RuO2 (NP2) has been used as the catalyst for photoinduced water oxidation with Ru(bpy)32+ as the photosensitizer and S2O82– as the sacrificial oxidant. Both NP2 and the previously prepared NP1 achieved O2 yields (based on S2O82–) of 95% and 88% and overall quantum efficiencies of 11.3% and 10.0%, respectively. These benchmark numbers far exceed those of many other metal oxide-based catalysts and previously reported RuO2 catalysts. In addition, NP2 has been recycled up to five times with minimal loss of activity.
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