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学科主题: 物理化学
题名: Photochemistry of Methanol on TiO2(110) Studied by Two-photon Photoemission and Scanning Tunneling Microscopy Method
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 MRS 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: Methanol can act as a strong enhancement agent for the photocatalytic H2 production in water/methanol mixture over TiO2.[1] The detailed physics for such strong enhancement in photocatalysis on TiO2, however, has not been clarified thus far.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). Methanol adsorbed on the Ti4+ sites was dissociated through the cleavage of O-H bond, and the proton was transferred to the nearby bridge bonded oxygen(BBO). Isotope effect has been found in this photoinduced proton transfer process. TD-2PPE reveals that the kinetics of methanol photodissociation is clearly not of single exponential, an important characteristic of this intrinsically heterogeneous photoreaction. This photocatalytic process is also found to be excitation wavelength dependent. [1] T. Kawai and T. Sakata, J. Chem. Soc., Chem. Commun., 1980, 694.
英文摘要: Methanol can act as a strong enhancement agent for the photocatalytic H2 production in water/methanol mixture over TiO2.[1] The detailed physics for such strong enhancement in photocatalysis on TiO2, however, has not been clarified thus far.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). Methanol adsorbed on the Ti4+ sites was dissociated through the cleavage of O-H bond, and the proton was transferred to the nearby bridge bonded oxygen(BBO). Isotope effect has been found in this photoinduced proton transfer process. TD-2PPE reveals that the kinetics of methanol photodissociation is clearly not of single exponential, an important characteristic of this intrinsically heterogeneous photoreaction. This photocatalytic process is also found to be excitation wavelength dependent. [1] 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/321008/115947
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. Photochemistry of Methanol on TiO2(110) Studied by Two-photon Photoemission and Scanning Tunneling Microscopy Method[C]. 见:Materials Research Society 2011 Spring Meeting. San Francisco. 2011-4-25.
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