4.7 Article

Interfacial interaction-dependent in situ restructure of NiO/TiO2 photocatalysts

Journal

APPLIED SURFACE SCIENCE
Volume 596, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.apsusc.2022.153606

Keywords

Photocatalytic water reduction; Co-catalyst; Heterojunction; Nickel oxide; Titania

Funding

  1. National Natural Science Foundation of China [21703001, 21525313]
  2. Chinese Academy of Sciences [KJ2021A0537]
  3. Changjiang Scholars Program of Ministry of Education of China
  4. Key Project of Anhui Province Department of Education

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Composite photocatalysts undergo in situ restructure during photocatalytic reactions, and the NiO-TiO2 interfacial interaction strongly influences this process. Different structures of the photocatalysts are acquired with increasing Ni loading, and they have varying effects on the photocatalytic activity.
Composite photocatalysts often undergo in situ restructure during photocatalytic reactions. Herein we report that the NiO-TiO2 interfacial interaction of NiO/TiO2 photocatalysts prepared via an ion exchange method strongly influences in situ restructure processes. With the Ni loading increasing, TiO2 supported NiO nanoparticles, TiO2 (core)-NiO (ultrathin shell) and TiO2 (core)-NiO (ultrathin shell) supported NiO nanoparticles are acquired sequentially. During photocatalytic water reduction reaction, TiO2 supported NiO nanoparticles and TiO2 (core)NiO (ultrathin shell) are stable due to strong NiO-TiO2 interfacial interaction, whereas NiO nanoparticles supported on TiO2 (core)-NiO (ultrathin shell) are reduced to Ni nanoparticles, resulting enhanced photocatalytic activity. These findings bridge heterogeneous thermocatalysis and photocatalysis with the phenomenon of interfacial interaction-dependent in situ restructure.

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