A Blinking Mesoporous TiO(2-x)Composed of Nanosized Anatase with Unusually Long-Lived Trapped Charge Carriers

0532376 - ÚPT 2021 RIV DE eng J - Článek v odborném periodiku
Zhang, T. - Low, J. - Yu, J. - Tyryshkin, A.M. - Mikmeková, Eliška - Asefa, T.
A Blinking Mesoporous TiO(2-x)Composed of Nanosized Anatase with Unusually Long-Lived Trapped Charge Carriers.
Angewandte Chemie - International Edition. Roč. 59, č. 35 (2020), s. 15000-15007. ISSN 1433-7851. E-ISSN 1521-3773
Institucionální podpora: RVO:68081731
Klíčová slova: electron-paramagnetic-res * nanostructured materials * photocatalytic activity * oxygen vacancy * doped tio2 * nanoparticles * nanomaterials
Obor OECD: Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
Impakt faktor: 15.336, rok: 2020
Způsob publikování: Omezený přístup
https://onlinelibrary.wiley.com/doi/abs/10.1002/anie.202005143

A mesoporous TiO(2-x)material comprised of small, crystalline, vacancy-rich anatase nanoparticles (NPs) shows unique optical, thermal, and electronic properties. It is synthesized using polymer-derived mesoporous carbon (PDMC) as a template. The PDMC pores serve as physical barriers during the condensation and pyrolysis of a titania precursor, preventing the titania NPs from growing beyond 10 nm in size. Unlike most titania nanomaterials, during pyrolysis the NPs undergo no transition from the anatase to rutile phase and they become catalytically active reduced TiO2-x. When exposed to a slow electron beam, the NPs exhibit a charge/discharge behavior, lighting up and fading away for an average period of 15 s for an extended period of time. The NPs also show a 50 nm red-shift in their UV/Vis absorption and long-lived charge carriers (electrons and holes) at room temperature in the dark, even long after UV irradiation. The NPs as photocatalysts show a good activity for CO(2)reduction.
Trvalý link: http://hdl.handle.net/11104/0310878