Dongwoo Kim, Hojoon Lim, Minsik Seo, Hyunsuk Shin, Kyungmin Kim, Moonjung Jung, Subin Jang, Byunghyun Chae, Buseung Park, Jungwoo Lee, Yongseok Choi, Ki-Jeong Kim, Jeongjin Kim, Xiao Tong, Adrian Hunt, Iradwikanari Waluyo, Bongjin Simon Mun
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The adsorbed CO<sub>3</sub> species on the Nb-doped SrTiO<sub>3</sub> surface increases continuously as the pressure increases but starts to leave the surface as the surface temperature increases, which occurs at approximately 373 K on the defect-free surface. On the undoped TiO<sub>2</sub>-enriched (1 × 1) SrTiO<sub>3</sub> surface, CO<sub>2</sub> adsorption also occurs first at the lattice oxygen sites. Both the doped and undoped SrTiO<sub>3</sub> surfaces exhibit an enhancement of the CO<sub>3</sub> species with the presence of oxygen vacancies, thus indicating the important role of oxygen vacancies in CO<sub>2</sub> dissociation. When OH species are removed from the undoped SrTiO<sub>3</sub> surface, the CO<sub>3</sub> species begin to form under 10<sup>-6</sup> mbar at 573 K, thus indicating the critical role of OH in preventing CO<sub>2</sub> adsorption. The observed CO<sub>2</sub> adsorption properties of the various SrTiO<sub>3</sub> surfaces provide valuable information for designing SrTiO<sub>3</sub>-based CO<sub>2</sub> catalysts.</p>","PeriodicalId":5,"journal":{"name":"ACS Applied Materials & Interfaces","volume":null,"pages":null},"PeriodicalIF":8.3000,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Study of CO<sub>2</sub> Adsorption Properties on the SrTiO<sub>3</sub>(001) Surface with Ambient Pressure XPS.\",\"authors\":\"Dongwoo Kim, Hojoon Lim, Minsik Seo, Hyunsuk Shin, Kyungmin Kim, Moonjung Jung, Subin Jang, Byunghyun Chae, Buseung Park, Jungwoo Lee, Yongseok Choi, Ki-Jeong Kim, Jeongjin Kim, Xiao Tong, Adrian Hunt, Iradwikanari Waluyo, Bongjin Simon Mun\",\"doi\":\"10.1021/acsami.4c04729\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>The adsorption properties of CO<sub>2</sub> on the SrTiO<sub>3</sub>(001) surface were investigated using ambient pressure X-ray photoelectron spectroscopy under elevated pressure and temperature conditions. 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Both the doped and undoped SrTiO<sub>3</sub> surfaces exhibit an enhancement of the CO<sub>3</sub> species with the presence of oxygen vacancies, thus indicating the important role of oxygen vacancies in CO<sub>2</sub> dissociation. When OH species are removed from the undoped SrTiO<sub>3</sub> surface, the CO<sub>3</sub> species begin to form under 10<sup>-6</sup> mbar at 573 K, thus indicating the critical role of OH in preventing CO<sub>2</sub> adsorption. 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引用次数: 0
摘要
在高压和高温条件下,使用常压 X 射线光电子能谱研究了 SrTiO3(001)表面的二氧化碳吸附特性。在室温下 10-6 毫巴 CO2 条件下,掺铌 TiO2 富集(1 × 1)的 SrTiO3 表面首先在氧晶格位点吸附 CO2,即形成 CO3 表面物种。当二氧化碳压力增加到 0.25 毫巴时,二氧化碳分子开始与氧空位相互作用。掺杂铌的 SrTiO3 表面上吸附的 CO3 物种随着压力的增加而不断增加,但随着表面温度的升高开始离开表面,这发生在无缺陷表面约 373 K 时。在未掺杂 TiO2 富集(1 × 1)的 SrTiO3 表面上,二氧化碳吸附也首先发生在晶格氧位点上。随着氧空位的存在,掺杂和未掺杂的 SrTiO3 表面都显示出 CO3 物种的增强,从而表明氧空位在 CO2 解离中的重要作用。当从未掺杂的 SrTiO3 表面去除 OH 物种时,CO3 物种开始在 573 K 时的 10-6 毫巴条件下形成,从而表明 OH 在阻止 CO2 吸附中的关键作用。观察到的各种 SrTiO3 表面的二氧化碳吸附特性为设计基于 SrTiO3 的二氧化碳催化剂提供了宝贵的信息。
Study of CO2 Adsorption Properties on the SrTiO3(001) Surface with Ambient Pressure XPS.
The adsorption properties of CO2 on the SrTiO3(001) surface were investigated using ambient pressure X-ray photoelectron spectroscopy under elevated pressure and temperature conditions. On the Nb-doped TiO2-enriched (1 × 1) SrTiO3 surface, CO2 adsorption, i.e., the formation of CO3 surface species, occurs first at the oxygen lattice site under 10-6 mbar CO2 at room temperature. The interaction of CO2 molecules with oxygen vacancies begins when the CO2 pressure increases to 0.25 mbar. The adsorbed CO3 species on the Nb-doped SrTiO3 surface increases continuously as the pressure increases but starts to leave the surface as the surface temperature increases, which occurs at approximately 373 K on the defect-free surface. On the undoped TiO2-enriched (1 × 1) SrTiO3 surface, CO2 adsorption also occurs first at the lattice oxygen sites. Both the doped and undoped SrTiO3 surfaces exhibit an enhancement of the CO3 species with the presence of oxygen vacancies, thus indicating the important role of oxygen vacancies in CO2 dissociation. When OH species are removed from the undoped SrTiO3 surface, the CO3 species begin to form under 10-6 mbar at 573 K, thus indicating the critical role of OH in preventing CO2 adsorption. The observed CO2 adsorption properties of the various SrTiO3 surfaces provide valuable information for designing SrTiO3-based CO2 catalysts.
期刊介绍:
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