Construction and excellent photoelectric synergistic anticorrosion performance of Z-scheme carbon nitride/tungsten oxide heterojunctions

The use of heterojunctions for metal corrosion protection is a highly innovative and challenging task. Based on the composition and structure of tungsten oxide-based heterojunctions, Z-scheme heterojunctions were designed and synthesized by the electrostatic self-assembly method using energy band-ma...

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Veröffentlicht in:Nanoscale 2022-09, Vol.14 (34), p.12358-12376
Hauptverfasser: Ge, Yunxiao, Guo, Xiaojiao, Zhou, Dan, Liu, Jinku
Format: Artikel
Sprache:eng
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Zusammenfassung:The use of heterojunctions for metal corrosion protection is a highly innovative and challenging task. Based on the composition and structure of tungsten oxide-based heterojunctions, Z-scheme heterojunctions were designed and synthesized by the electrostatic self-assembly method using energy band-matched g-C 3 N 4 and WO 3 materials. Applied in the field of anticorrosion, they overcame the problems of poor reduction ability and transmission inefficiency of traditional materials. The Z-scheme heterojunctions ensured unidirectional electron transfer, while the aggregation of the retained strongly reduced electrons on the surface of the iron substrates provided a strong driving force for retarding corrosion occurrence. Meanwhile, the inherent shielding properties of the two-dimensional material g-C 3 N 4 and the confinement of chloride ions as an electroactive layer hindered the penetration of the corrosive solution. After being corroded for 72 h, the corrosion impedance of the g-C 3 N 4 /WO 3 heterojunction system was improved by 640.11% compared with the epoxy resin coating. In addition, the g-C 3 N 4 /W 18 O 49 heterojunction was synthesized by using mixed valence tungsten oxide, which overcame the problems of photogenerated electron yield and lifetime, and enhanced the anticorrosion performance compared with a single g-C 3 N 4 phase. This research provided ideas for designing efficient and environmentally friendly heterojunction anticorrosion materials. The heterojunction anticorrosion mechanism: (a) photoelectric reduction effect of CN/WO, (b) steric repulsion effect of CN/WO, (c) adsorption shielding effect of CN/WO, and (d) the possible interfacial contact process of 60CN/W 18 O 49 .
ISSN:2040-3364
2040-3372
DOI:10.1039/d2nr03246e