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 |
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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
. |
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ISSN: | 2040-3364 2040-3372 |
DOI: | 10.1039/d2nr03246e |