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学科主题: 物理化学
题名: Site-specific Photocatalytic Splitting of Methanol on TiO2(110)
作者: Zhou CY(周传耀) ;  Ren ZF(任泽峰) ;  Tan SJ(谭世倞) ;  Ma ZB(马志博) ;  Fan HJ(樊红军) ;  AlecM.Wodtke ;  Wang B(王兵) ;  Yang XM(杨学明)
会议文集: 2011 Spring Meeting Program and Exhibit Guide
会议名称: Materials Research Society 2011 Spring Meeting
会议日期: 2011-4-25
出版日期: 2011
会议地点: San Francisco
通讯作者: XuemingYang
出版者: 待补充
出版地: 待补充
合作性质: 分会口头报告
部门归属: 1102
主办者: Materials Research Society
摘要: Titanium dioxide is one of the most important materials for real world applications in chemical catalysis.[1-4] Photocatalysis by TiO2, especially its application in water splitting,[1] has attracted much attention. It has been reported that pure TiO2 is minimally active for water splitting to produce hydrogen,[5] while the same catalyst is much more active for hydrogen production from water-methanol mixture.[6]Clearly, the chemistry of methanol on TiO2 has played a crucial role in this process. Therefore, it is essential to understand the photocatalytic chemistry of methanol on TiO2, which could potentially provide clues for developing new efficient photocatalysts for water splitting. Here, we report the first clear evidence of photocatalyzed splitting of methanol on TiO2 derived from time-dependent two-photon photoemission (TD-2PPE) results in combination with scanning tunneling microscopy (STM). STM tip induced molecular manipulation before and after UV light irradiation clearly reveals photocatalytic bond cleavage, which occurs only at Ti4+ surface sites. TD-2PPE reveals that the kinetics of methanol photodissociation is clearly not of single exponential, an important characteristic of this intrinsically heterogeneous photoreaction. [1] A. Fujishima and K. Honda, Nature, 1972, 238, 37. [2] M. A. Fox and M. T. Dulay, Chem. Rev., 1993, 93, 341. [3] P. V. Kamat, Chem. Rev., 1993, 93, 267. [4] A. L. Linsebigler, G. Lu and J. T. Yates, Jr, Chem. Rev., 1995, 95, 735. [5] S. Sato and J. M. White, Chem. Phys. Lett., 1980, 72, 83. [6] T. Kawai and T. Sakata, J. Chem. Soc., Chem. Commun., 1980, 694.
英文摘要: Titanium dioxide is one of the most important materials for real world applications in chemical catalysis.[1-4] Photocatalysis by TiO2, especially its application in water splitting,[1] has attracted much attention. It has been reported that pure TiO2 is minimally active for water splitting to produce hydrogen,[5] while the same catalyst is much more active for hydrogen production from water-methanol mixture.[6]Clearly, the chemistry of methanol on TiO2 has played a crucial role in this process. Therefore, it is essential to understand the photocatalytic chemistry of methanol on TiO2, which could potentially provide clues for developing new efficient photocatalysts for water splitting. Here, we report the first clear evidence of photocatalyzed splitting of methanol on TiO2 derived from time-dependent two-photon photoemission (TD-2PPE) results in combination with scanning tunneling microscopy (STM). STM tip induced molecular manipulation before and after UV light irradiation clearly reveals photocatalytic bond cleavage, which occurs only at Ti4+ surface sites. TD-2PPE reveals that the kinetics of methanol photodissociation is clearly not of single exponential, an important characteristic of this intrinsically heterogeneous photoreaction. [1] A. Fujishima and K. Honda, Nature, 1972, 238, 37. [2] M. A. Fox and M. T. Dulay, Chem. Rev., 1993, 93, 341. [3] P. V. Kamat, Chem. Rev., 1993, 93, 267. [4] A. L. Linsebigler, G. Lu and J. T. Yates, Jr, Chem. Rev., 1995, 95, 735. [5] S. Sato and J. M. White, Chem. Phys. Lett., 1980, 72, 83. [6] T. Kawai and T. Sakata, J. Chem. Soc., Chem. Commun., 1980, 694.
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/115948
Appears in Collections:中国科学院大连化学物理研究所_会议论文

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Recommended Citation:
Zhou CY,Ren ZF,Tan SJ,et al. Site-specific Photocatalytic Splitting of Methanol on TiO2(110)[C]. 见:Materials Research Society 2011 Spring Meeting. San Francisco. 2011-4-25.
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