Electron transfer behavior and water photodecomposition ability of calcined material from a cerium-S-phenylene-O-holmium-O-phenylene-S hybrid copolymer

摘要

Calcination of a cerium-S-phenylene-O-holmium-O-phenylene-S hybrid copolymer under a vacuum gave cerium oxide-carbon cluster-holmium oxide composite material.The material calcined at 600 deg C loaded with Pt particles could decompose water to H_2 and O_2 with a H_2/O_2 ratio of 2 under visible light irradiation.ESR spectral examinations of the calcined materials revealed the possibility of a two-step electron transfer in the process of CeO_2 -> carbon cluster -> Ho_2O_3 -> Pt with an oxidation site at CeO_2 particles and a reduction site at Pt particles.