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Spontaneous polarization of ferroelectric heterostructured nanorod arrays for high-performance photoelectrochemical cathodic protection

Liu, Yunpeng, Wang, Zhenyu, Lin, Changzheng, Zhang, Juantao, Feng, Jiangtao, Hou, Bo ORCID: https://orcid.org/0000-0001-9918-8223, Yan, Wei, Li, Mingtao and Ren, Zijun 2023. Spontaneous polarization of ferroelectric heterostructured nanorod arrays for high-performance photoelectrochemical cathodic protection. Applied Surface Science 609 , 155345. 10.1016/j.apsusc.2022.155345
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Abstract

Corrosion is a critical global problem for the steel industry and a grand challenge toward Net-Zero clean growth. TiO2 nanorods (TNRs) have been developed for photoelectrochemical cathodic protection (PCP) of coupled metal. However, the performance was hindered by their wide bandgap, weak visible-light response, and low separation efficiency of photocarriers. In this work, a unique multilayered coaxial nanorod array (TNRs/BTO/Ag NPs) structure has been proposed to enhance ‘hot’ electrons injection via inserting a ferroelectric semiconductor BaTiO3 (BTO) nanolayer between TNRs and Ag nanoparticles (Ag NPs). The spontaneous ferroelectric BTO nanolayer built a polar charge-induced electric field (PEF), resulting in a strong spontaneous polarization. Furthermore, the as-proposed structure can negatively shift the surface potential of the coupling 304 stainless steel by 0.80 V relative to its corrosion potential under simulated solar light illumination which is the record PCP potential among reported works. Based on comprehensive electrochemical and theoretical studies, the origin of the enhanced photo-generated carriers’ separation and depletion to the coupled metals is attributed to a synergic effect between PEF (the spontaneous polarization of BTO) and internal electric field (IEF) resulting from the cascade energy band alignment. Various promising applications can be envisioned from as-proposed multilayered coaxial nanorod array photoelectrodes.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Elsevier
ISSN: 0169-4332
Date of First Compliant Deposit: 28 October 2022
Date of Acceptance: 14 October 2022
Last Modified: 08 Nov 2022 17:43
URI: https://orca.cardiff.ac.uk/id/eprint/153848

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