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学科主题: 物理化学
题名: Photochemistry of Methanol on TiO2(110)
作者: Zhou CY(周传耀) ;  Ren ZF(任泽峰) ;  Ma ZB(马志博) ;  Tan SJ(谭世倞) ;  Fan HJ(樊红军) ;  Wang B(王兵) ;  杨学明*
会议文集: Conference on Molecular Energy Transfer 2011 Book of abstracts
会议名称: 2011 Conference on molecular energy transfer
会议日期: 2011-9-11
出版日期: 2011
会议地点: 牛津
其他题名: 甲醇在TiO2(110)表面的光化学
通讯作者: 杨学明
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: University of Oxford
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 can be well described by the fractal-like kinetics model, however, the physical nature of the fractal parameters is not clear immediately. Further studies showed that the photocatalyzed dissociation rate of methanol on reduced TiO2(110) is more than an order of magnitude faster than on the stoichiometric surface, indicating the surface defects could accelerate the photocatalysis process of methanol on TiO2(110) in a significant way, probably by lowering the reaction barrier.
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 can be well described by the fractal-like kinetics model, however, the physical nature of the fractal parameters is not clear immediately. Further studies showed that the photocatalyzed dissociation rate of methanol on reduced TiO2(110) is more than an order of magnitude faster than on the stoichiometric surface, indicating the surface defects could accelerate the photocatalysis process of methanol on TiO2(110) in a significant way, probably by lowering the reaction barrier.
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/115968
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,Ma ZB,et al. Photochemistry of Methanol on TiO2(110)[C]. 见:2011 Conference on molecular energy transfer. 牛津. 2011-9-11.
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