期刊
APPLIED SURFACE SCIENCE
卷 566, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2021.150694
关键词
ZnO; Nanowire; Oxygen vacancy; Photoelectrochemical; Cathodic protection
类别
资金
- Hundred Talent Program from Sun Yat-sen University
Engineering oxygen vacancies in metal oxides can improve their photoelectrochemical performances. A ZnO nanowire photoanode with oxygen vacancies demonstrated superior photocathodic protection performance, with the protection potential stabilizing at a high level under continuous illumination.
Oxygen vacancy engineering of metal oxides is an effective strategy to modulate electronic structures and regulate active sites for improving their photoelectrochemical performances. Herein, a robust ZnO nanowire photoanode with an appropriate amount of oxygen vacancies was synthesized through a seed-assistant hydro thermal approach. Under intermittent sunlight illumination, the as-prepared ZnO nanowire photoanode shifts the open circuit potential of the coupled 304 stainless steel to 770 mV with a potential drop of 503 mV relative to steel's corrosion potential (-267 mV), suggesting a superior photocathodic protection performance. In a durability test, the photocathodic protection potential further drops and stabilizes at 930 mV for hours under continuous illumination, which is attributed to the formation of ZnO/ZnS core/shell heterostructures as well as the in-situ creation of anionic vacancies. This work demonstrates an advantageous effect of oxygen vacancies on the metal oxide photoanodes during photocathodic protection process.
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