Charge carrier trapping, recombination and transfer during TiO2 photocatalysis: An overview
2018; Elsevier BV; Volume: 335; Linguagem: Inglês
10.1016/j.cattod.2018.10.053
ISSN1873-4308
AutoresRuifeng Qian, Huixin Zong, Jenny Schneider, Guanda Zhou, Ting Zhao, Yongli Li, Jing Yang, Detlef W. Bahnemann, Jia Hong Pan,
Tópico(s)Copper-based nanomaterials and applications
ResumoHeterogeneous photocatalysis mediated by semiconducting TiO2 has attracted continuous interest during the past decades and has shown great potentials in environmental remediation and solar energy conversion. Basically, photocatalysis is initiated by the TiO2 excitation. The generated charge carriers undergo trapping, recombination, and interfacial transfer before proceeding the redox reaction at TiO2 surface. Monitoring the charge carrier dynamics is of particulate importance for understanding the underlying mechanism and designing efficient photocatalysts. This review overviews the recent progress in characterization of charge carrier dynamics. We will present the analytic techniques for monitoring the fate of charge carriers at each elementary photocatalytic step, including charge carrier generation, trapping and recombination inside the photocatalyst, as well as the interfacial charge transfer. The charge carrier dynamics at TiO2/H2O interface, hole transfer reactions for O2 production, and photocatalytic oxidation of organic compounds and nitric oxides, and electron transfer reactions for photocatalytic reduction of viologens and metal ions are addressed, aiming at a deeper understanding of photocatalytic process.
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