Co‐Dissolved Isostructural Polyoxovanadates to Construct Single‐Atom‐Site Catalysts for Efficient CO2Photoreduction

Abstract We explored a co‐dissolved strategy to embed mono‐dispersed Pt center into V 2 O 5 support via dissolving [PtV 9 O 28 ] 7− into [V 10 O 28 ] 6− aqueous solution. The uniform dispersion of [PtV 9 O 28 ] 7− in [V 10 O 28 ] 6− solution allows [PtV 9 O 28 ] 7− to be surrounded by [V 10 O 28 ] 6− clusters via a freeze‐drying process. The V centers in both [PtV 9 O 28 ] 7− and [V 10 O 28 ] 6− were converted into V 2 O 5 via a calcination process to stabilize Pt center. These double separations can effectively prevent the Pt center agglomeration during the high‐temperature conversion process, and achieve 100 % utilization of Pt in [PtV 9 O 28 ] 7− . The resulting Pt‐V 2 O 5 single‐atom‐site catalysts exhibit a CH 4 yield of 247.6 μmol g −1 h −1 , 25 times higher than that of Pt nanoparticle on the V 2 O 5 support, which was accompanied by the lactic acid photooxidation to form pyruvic acid. Systematical investigations on this unambiguous structure demonstrate an important role of Pt−O atomic pair synergy for highly efficient CO 2 photoreduction.