Electron-Induced Dissociation of CO2 on TiO2(110)
Electron-Induced Dissociation of CO2 on TiO2(110)
复制标题
DOI：
10.1021/ja204077e
复制
发表时间：
2011-07-06
影响因子：
15
通讯作者：
Deng, Xingyi
中科院分区：
文献类型：
--
作者：
Lee, Junseok;Sorescu, Dan C.;Deng, Xingyi
利用扫描隧道显微镜（STM）在单分子水平上研究了TiO2（110）表面氧空位缺陷处吸附CO2的电子诱导解离过程。电子从STM尖端注入到吸附的CO2中，诱导CO2的解离。发现在解离过程中释放的氧原子可以治愈氧空位缺陷。统计分析表明，CO2的解离是一个单电子过程。偏置相关的离解产率表明，CO2的电子诱导离解的阈值能量比TiO2的导带最小值高1.4 eV。注入的电子形成一个瞬态负离子被认为是CO2解离的关键过程。
The electron-induced dissociation of CO2 adsorbed at the oxygen vacancy defect on the TiO2(110) surface has been investigated at the single-molecular level using scanning tunneling microscopy (STM). Electron injection from the STM tip into the adsorbed CO2 induces the dissociation of CO2. The oxygen vacancy defect is found to be healed by the oxygen atom released during the dissociation process. Statistical analysis shows that the dissociation of CO2 is one-electron process. The bias-dependent dissociation yield reveals that the threshold energy for electron-induced dissociation of CO2 is 1.4 eV above the conduction-band minimum of TiO2. The formation of a transient negative ion by the injected electron is considered to be the key process in CO2 dissociation.