Elizaveta Kozyr, Sara Martí-Sánchez, Alina Skorynina, Jordi Arbiol, Carlos Escudero, Lorenzo Mino, Aram Bugaev
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引用次数: 0
摘要
光催化剂的原位和操作研究在了解活性相形成过程和催化反应机理方面发挥着基础性作用,这对于合理设计更高效的材料至关重要。利用定制的操作光催化池,提出了一种通过同步辐射 X 射线吸收光谱(XAS)跟踪 Pd/TiO2 光催化剂形成步骤的原位程序。与传统的间歇式反应器中生成的样品相比,该程序生成的 Pd 颗粒大小分布窄得多,且均匀地分布在 TiO2 载体上。原位 XAS 光谱法与高角度环形暗场扫描透射电子显微镜相结合,证明了单原子 Pd(0) 位点在二氧化钛上的形成是光沉积过程的第一步。所有研究样品在接触甲酸溶液后都观察到了氢化钯颗粒。
In situ photodeposition of ultra-small palladium particles on TiO2.
In situ and operando investigation of photocatalysts plays a fundamental role in understanding the processes of active phase formation and the mechanisms of catalytic reactions, which is crucial for the rational design of more efficient materials. Using a custom-made operando photocatalytic cell, an in situ procedure to follow the formation steps of Pd/TiO2 photocatalyst by synchrotron-based X-ray absorption spectroscopy (XAS) is proposed. The procedure resulted in the formation of ∼1 nm Pd particles with a much narrower size distribution and homogeneous spreading over TiO2 support compared with the samples generated in a conventional batch reactor. The combination of in situ XAS spectroscopy with high-angle annular dark-field scanning transmission electron microscopy demonstrated the formation of single-atom Pd(0) sites on TiO2 as the initial step of the photodeposition process. Palladium hydride particles were observed for all investigated samples upon exposure to formic acid solutions.
期刊介绍:
Synchrotron radiation research is rapidly expanding with many new sources of radiation being created globally. Synchrotron radiation plays a leading role in pure science and in emerging technologies. The Journal of Synchrotron Radiation provides comprehensive coverage of the entire field of synchrotron radiation and free-electron laser research including instrumentation, theory, computing and scientific applications in areas such as biology, nanoscience and materials science. Rapid publication ensures an up-to-date information resource for scientists and engineers in the field.