物理化学学报 >> 1987, Vol. 3 >> Issue (02): 123-128.doi: 10.3866/PKU.WHXB19870204

研究论文 上一篇    下一篇

CO3O4/SrTiO3光催化分解水制氢的研究

刘旺; 王德军; 李铁津   

  1. 吉林大学化学系
  • 收稿日期:1985-10-28 修回日期:1986-03-27 发布日期:1987-04-15

A STUDY OF HYDROGEN PRODUCTION BY PHOTOCATALYTIC DECOMPOSITION OF LIQUID WATER ON Co3O4/SrTiO3

Liu Wang; Wang Dejun; Li Tiejin   

  1. Department of Chemistry; Jilin University; Changchun
  • Received:1985-10-28 Revised:1986-03-27 Published:1987-04-15

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摘要： 本文报道了利用掺有Co_3O_4的SrTiO_3多晶粉末进行光催化分解水制氢的研究结果。其中着重考察了光催化剂的预处理和反应液OH~-浓度等因素对催化活性的影响; 同时利用表面光电压谱(SPV)技术和ESR对光催化剂的表面光-伏性质、电子性质进行了研究。并注意从SrTiO_3的能带结构考虑, 借助于表面态的概念, 对光催化机制进行了初步的探讨。

Abstract: This paper reports the results of a study devoted to the hydrogen production from liquid water on Co_3O_4/SrTiO_3 powders under UV irradiation. The results indi- cated that the photocatalysts behave rather actively in alkali solution. A strong con- centration dependence of OH~- for the rate of H_2 formation was observed. Reduction pretreatment of the photocatalysts by H_2 is unfavourable for the H_2 production, but an oxidation pretreatment by O_2 may improve remarkably the catalytic effi- ciency. By using SPV technique and ESR, it is found that near and above valence band of SrTiO_3 the photocatalysts have band-gap surface states, which may associate with surface cobalt ions. We believe that the surface states play a key role in the charge separation and transfer processes. Finally, a mechanism model is proposed.