Enhanced anticorrosion mechanism of photocathodic protection coatings with zinc indium sulfide/titanium oxide Z-scheme heterojunctions

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Construction and Building Materials Pub Date : 2024-11-12 DOI:10.1016/j.conbuildmat.2024.139109

Zheng Li , Xiaoying Zhang , Zuquan Jin , Haosen Jiang , Xiaoqing Wang , Yuehua Chen , Yue Zhang , Baorong Hou

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Abstract

In order to develop novel anti-corrosion technologies of metals, the photoelectrochemical cathodic protection (PECCP) coating with zinc indium sulfide/titanium oxide (Zn₂In₂S₅/TiO₂) was successfully fabricated and its enhanced anticorrosion mechanism was explored in marine environment under light and dark condition, respectively. It found that the improvement of anticorrosion performance is due to the introduction of Zn₂In₂S₅/TiO₂ with Z-scheme heterojunctions, which has been verified systematically through theoretical calculations and electrochemical experiments. Under illumination, the photoelectrons generated by Zn₂In₂S₅/TiO₂ Z-scheme heterojunctions were accumulated on the conduction band (CB) of Zn₂In₂S₅ at an internal electric field (IEF) pointing from Zn₂In₂S₅ to TiO₂, which endowed Zn₂In₂S₅/TiO₂ with strong oxidation-reduction ability to provide PECCP for Q235CS and 304SS in 3.5 wt% NaCl. In the dark state, Zn₂In₂S₅/TiO₂ Z-scheme heterojunctions served as nanofills to enhance the maze effect, ensuring the remarkable anticorrosion performance of PECCP coating. Furthermore, the protective effect of Zn₂In₂S₅/TiO₂ coating was quantified as 74.23 % and 98.91 % for 304SS and Q235CS in 3.5 wt% NaCl for 30 days, respectively.

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硫化锌铟/氧化钛 Z 型异质结增强光阴极保护涂层的防腐机理

为开发新型金属防腐技术，成功制备了硫化锌铟/氧化钛（Zn2In2S5/TiO2）光电化学阴极保护（PECCP）涂层，并分别在海洋环境的明暗条件下探索了其增强防腐性能的机理。研究发现，防腐性能的提高得益于 Zn2In2S5/TiO2 中引入了 Z 型异质结，这一点通过理论计算和电化学实验得到了系统的验证。在光照下，Zn2In2S5/TiO2 Z 型异质结产生的光电子在 Zn2In2S5 的导带（CB）上积累，内电场（IEF）从 Zn2In2S5 指向 TiO2，这使得 Zn2In2S5/TiO2 具有很强的氧化还原能力，可在 3.5 wt% NaCl 中为 Q235CS 和 304SS 提供 PECCP。在暗态下，Zn2In2S5/TiO2 Z 型异质结作为纳米填料增强了迷宫效应，确保了 PECCP 涂层的显著防腐性能。此外，Zn2In2S5/TiO2 涂层对 304SS 和 Q235CS 在 3.5 wt% NaCl 中 30 天的保护效果分别达到 74.23% 和 98.91%。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.