物理化学学报 >> 2007, Vol. 23 >> Issue (04): 601-604.doi: 10.3866/PKU.WHXB20070429

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Cu/Sr3Ti2O7的制备及其光催化分解水制氢活性

方舒玫; 欧延; 林敬东; 廖代伟   

  1. 厦门大学化学系, 固体表面物理化学国家重点实验室, 物理化学研究所, 福建 厦门 361005
  • 收稿日期:2006-10-10 修回日期:2006-11-21 发布日期:2007-04-05
  • 通讯作者: 廖代伟 E-mail:dwliao@xmu.edu.cn

Preparation of Cu/Sr3Ti2O7 and Its Photocatalytic Activity of Watersplitting for Hydrogen Evolution

FANG Shu-Mei; OU Yan; LIN Jing-Dong; LIAO Dai-Wei   

  1. Department of Chemistry, State Key Laboratory of Physical Chemistry of Solid Surfaces, Institute of Physical Chemistry, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
  • Received:2006-10-10 Revised:2006-11-21 Published:2007-04-05
  • Contact: LIAO Dai-Wei E-mail:dwliao@xmu.edu.cn

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摘要： 采用聚合合成法(PCM)合成出层状钙钛矿结构的Sr3Ti2O7, 进而负载Cu 离子, 制成Cu/Sr3Ti2O7催化剂. 以超纯水和甲醇牺牲剂体系的光催化分解反应为探针, 通过检测氢气生成速率评价了催化剂的光催化性能, 并借助光电子能谱(XPS)、X 射线衍射(XRD)分析、紫外-可见漫反射光谱(UV-Vis DRS)等手段对催化剂进行了表征. 实验结果表明, Cu 在催化剂中以多价态存在, Cu+和吸附氧有利于光生电子的转移. Cu/Sr3Ti2O7催化剂较之纯Sr3Ti2O7催化剂活性大大提高, Cu 最佳负载量为1.5%(w). 产氢速率可稳定在550-600 μmol·h-1. 还原过的Cu/Sr3Ti2O7催化剂产氢速率最高可达1140.8 μmol·h-1.

关键词: 钙钛矿, 分解水, 氢气, 光催化剂, Sr3Ti2O7

Abstract: Sr3Ti2O7 photocatalyst with perovskite-layered structure was synthesized by polymerized complex method (PCM). Cu ion as an effective dopant was loaded onto Sr3Ti2O7 catalyst. Cu/Sr3Ti2O7 catalyst was applied in the mixture of water and methanol, methanol was used as a sacrificial agent under ultra-violet irradiation, and the catalyst was characterized by XPS, XRD, and UV-Vis DRS. The results showed that Cu existed in several kinds of valence and the photocatalytic activity of Cu/Sr3Ti2O7 was superior to that of pure Sr3Ti2O7. Cu+ and adsorbed oxygen can accelerate the interfacial electron transfer. When the amount of Cu was 1.5%(w), the best catalytic effect was obtained and the stable average hydrogen evolution rate was about 550-600 μmol·h-1. The Cu/Sr3Ti2O7 after reduction attained the highest hydrogen evolution rate that was close to 1140.8 μmol·h-1.

Key words: Perovskite, Water splitting, Hydrogen, Photocatalysts, Sr3Ti2O7