4.7 Article

Dynamic Internal Field Engineering in BaTiO3-TiO2 Nanostructures for Photocatalytic Dye Degradation

Journal

ACS APPLIED NANO MATERIALS
Volume 4, Issue 4, Pages 3742-3749

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c00205

Keywords

ferroelectric-semiconductor heterojunction photocatalyst; polarization-induced electric field; thermal-variation-driven pyroelectric effect; dynamic internal field; charge separation and transport

Funding

  1. National Natural Science Foundation of China [51472037]
  2. Foundation from the Shenzhen Science and Technology Innovation Committee [JCYJ20170818160815002]
  3. Natural Science Foundation of Chongqing [cstc2020jcyj-msxmX0930]
  4. Program for Creative Research Groups in the University of Chongqing [CXQT19031]

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By utilizing the pyroelectric effect of BaTiO3 and introducing consecutive periodic thermal variation into BaTiO3-TiO2 nanostructures, this study achieved dynamic internal field engineering, leading to significantly enhanced photocatalytic activity.
Ferroelectric-semiconductor nanostructures can exhibit enhanced photocatalytic activity benefiting from charge separation and transport facilitated by a spontaneous polarization-induced electric field. However, this static electric field can be easily compensated, thus hindering enhancement of photocatalysis. In this study, we propose to introduce a consecutive periodic thermal variation into BaTiO3-TiO2 nanostructures to achieve excellent photocatalysis via dynamic internal field engineering based on the pyroelectric effect of BaTiO3. The theoretical simulation reveals that spontaneous polarization of BaTiO3 can be changed with temperature, which in consequence varies strength and distribution of the polarization-induced electric field, leading to the formation of a dynamic internal field in the BaTiO3-TiO2 nanostructures. Experimental evidence proved that the dynamic internal field facilitated by the consecutive thermal variation can function for incessant charge separation and transport as well as accelerated catalytic reactions over the BaTiO3-TiO2 nanostructures, thereby resulting in significantly improved degradation efficiency with a remarkable cyclic ability.

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