Co-SrTiO_3上光催化分解水制氢的性能研究  

Performance of Photocatalytic Decomposition of Water into Hydrogen over Co-SrTiO_3

作　　者：王桂[1] 王延吉[1] 宋宝俊[1] 许永权[1] 

机构地区：[1]河北工业大学化工学院,天津300130

出　　处：《无机化学学报》2003年第9期988-992,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金资助项目(No.20176008)。

摘　　要：The activity of Co-SrTiO3 for photocatalytic decomposition of water into hydr ogen was studied, and the reason for improvement of activity of supported cataly sts by first reduction in H2 at a higher temperature and then reoxidation in oxy gen at a lower temperature was analyzed. The mechanism of the photocatalysis of Co-SrTiO3-R-O and Ni-SrTiO3-R-O catalyst was investigated. The metal, Ni o r Co deposited at the interface between the P-type semiconductor, NiO or CoO, a nd the N-type semiconductor, SiTiO3, which may act as the trapped site of elect ron and hole from the N-type semiconductor and the P-type semiconductor respec tively, suppresses the recombination of electron and hole in the bulk of semicon ductor, and furthermore increase the catalytic activity of the catalyst. A highe r activity of Co-SrTiO3-R-O for water decomposition than that of Ni-SrTiO3- R-O is mainly due to CoO having a narrower band gap and a wider range of light absorbance, compared with NiO.The activity of Co-SrTiO3 for photocatalytic decomposition of water into hydrogen was studied, and the reason for improvement of activity of supported catalysts by first reduction in H-2 at a higher temperature and then reoxidation in oxygen at a lower temperature was analyzed. The mechanism of the photocatalysis of Co-SrTiO3-R-O and Ni-SrTiO3-R-O catalyst was investigated. The metal, Ni or Co deposited at the interface between the P-type semiconductor, NiO or CoO, and the N-type semiconductor, SiTiO3, which may act as the trapped site of electron and hole from the N-type semiconductor and the P-type semiconductor respectively, suppresses the recombination of electron and hole in the bulk of semiconductor, and furthermore increase the catalytic activity of the catalyst. A higher activity of Co-SrTiO3-R-O for water decomposition than that of Ni-SrTiO3-R-O is mainly due to CoO having a narrower band gap and a wider range of light absorbance, compared with NiO.

关 键 词：氢气 清洁生产 半导体氧化物 催化剂 光催化分解 水 钛酸锶 氧化钴 氢能 

分 类 号：TQ116.2[化学工程—无机化工]