Study on Catalytic Water Oxidation Properties of Polynuclear Manganese Containing Polyoxometalates

Splitting of water to produce hydrogen and oxygen is a green effective method clean energy. Finding an efficient decomposition catalyst the key step realize decomposition. In this work, by choosing from literature, six polynuclear manganese (Mn) containing polyoxometalates (Mn-POMs) with different Mn-O clusters oxidation states Mn, [MnIIMnIIISiW10O37(OH)(H2O)]6? (Mn2-POM), [MnII3MnIII(H2O)2(PW9O34)2]9? (Mn4-POM), [MnII4MnIII2Ge3W24O94(H2O)2]18? (Mn6-POM-1), [MnIII2MnII4(?3-O)2(H2O)4(B-?-SiW8O31)(B-?-SiW9O34)(?-SiW10O36)]18? (Mn6-POM-4), [{MnIII3MnIV4O4(OH)2(OH2)}2(W6O22)(H2W8O32)2(H4W13O46)2]26? (Mn14-POM), [MnII19 (OH)12(SiW10O37)6]34? (Mn19-POM) were prepared. First, catalytic performance towards Mn-POMs was investigated in solution for first time. Second, fabricated on surface ITO electrode using layer-by-layer self-assembly (LBL) form composite films, which characterized UV-vis spectroscopy cyclic voltammetry, then films studied compared that via series controlled experiments, results indicate three-dimensional structures, contain variable valence cluster similar structure photocatalytic active center (PSII) exhibit better performance.