A purely inorganic germanium–molybdenum–oxo cluster with ruthenium participation for visible-light-driven CO2 reduction
Photocatalytic carbon dioxide reduction is considered an important strategy to solve environmental problems, such as greenhouse gases, but designing and synthesizing effective photocatalysts is a challenge. In recent years, photocatalytic carbon dioxide reduction by polyoxometalates (POMs) has attracted increasing research interest. Herein, the first purely inorganic ruthenium–germanium–molybdenum–oxygen cluster, Na12Rb2[Ru2O2(GeMo10O36)2]·44H2O (Ru2Ge2Mo20), was synthesized by hydrothermal and volatilization methods and applied to photocatalytic carbon dioxide reduction. The yield of CH4 reached 547.84 μmol g−1 in the heterogeneous photocatalytic reaction system with an electron selectivity of 96.86% with respect to CO (71.08 μmol g−1) after 6 h. The reaction mechanism was confirmed by UV-Vis diffuse reflection spectroscopy, ultraviolet photoelectron spectroscopy (UPS), electrochemical measurements, and steady-state fluorescence quenching experiments. This work provides a reference for the design of Ru-containing polyoxometalates for photocatalytic CO2 reduction.
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