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Effect of Co3O4/TiO2 heterojunction photoanode with enhanced photocathodic protection on 304 stainless steel under visible light by Xinran Li; Xiutong Wang; Youbo Nan; Yanan Sun; Hui Xu; Lifeng Chi; Yanliang Huang; Jizhou Duan; Baorong Hou is a Materials Science article available to read on EtoBox.

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The Co3O4/TiO2 compound photoanodes were prepared by anodization and low-temperature hydrothermal method for the photocathodic protection of 304 stainless steel (304SS). The effect of Co3O4 loading on corrosion resistance of 304SS in 3.5 wt% NaCl was studied by changing the cobalt nitrate concentration of hydrothermal solutions, where the photoanodes were immersed in 0.1 M Na2S+ 0.2 M NaOH solution during tests. Compared with pure TiO2, Co3O4/TiO2 shows stronger visible-light absorption, higher separation efficiency of photocarriers, and better corrosion protection in dark. When cobalt nitrate concentration is 1 mM in the reaction solution, the compound exhibits the best protection performance with a coupled potential under illumination/dark of –0.69/–0.45 VSCE. This enhanced corrosion resistance is not only due to the staggered p-n heterojunction at Co3O4/TiO2 interface but also due to the excellent optical absorption activity and electronic storage capacity of Co3O4. Specifically, the p-n internal electric field drives the photoelectrons to flow to the 304SS under illumination. Meanwhile, it triggers the reverse flow once the light is removed. The latter electrons are stored by C

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Author

Xinran Li; Xiutong Wang; Youbo Nan; Yanan Sun; Hui Xu; Lifeng Chi; Yanliang Huang; Jizhou Duan; Baorong Hou

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)