Construction of Self‐Healing Internal Electric Field for Sustainably Enhanced Photocatalysis. (11th January 2019)

• Record Type: Journal Article
• Authors: Dai, Baoying; Yu, Yunru; Chen, Yukai; Huang, Hengming; Lu, Chunhua; Kou, Jiahui; Zhao, Yuanjin; Xu, Zhongzi
• Is Part Of: Advanced functional materials. Volume 29:Number 16(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-01-11
• Subjects: bioinspired -- charge separation -- microfluidics -- photocatalysis -- self‐healing; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201807934
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: The construction of internal electric field is generally considered an effective strategy to enhance photocatalytic performance due to its significant role in charge separation. However, static internal electric field is prone to be saturated either by inner or outer shield effect, and thus its effect on the improvement of photocatalysis can easily vanish. Here, the self‐healing internal electric field is proposed and successfully endowed to a designed helical structural composite microfiber polyvinylidene fluoride/g‐C3 N4 (PVDF/g‐C3 N4 ) based on the bioinspired simple harmonic vibration. Importantly, the saturation and recovery of internal electric field are characterized by transient photovoltage and photoluminescence. The results indicate that the internal electric field could be saturated within about 10 min and refreshed with the assistance of rebuilt piezoelectric potential. The lifetime of photogenerated carriers is about 10 −4 s and the number of effective carriers is greatly increased in the presence of self‐healing internal electric field. The results provide direct experimental evidence on the role of self‐healing internal electric field in charge transfer behavior. This work represents a new design strategy of photocatalysts, and it may open up new horizons for solving energy shortage and environmental issues. Abstract : Inspired by the spontaneous self‐healing system of natural creatures, the self‐healing ability of an internal electric field is endowed with a helical structural composite microfiber based on bioinspired simple harmonic vibration. The saturation and recovery of the piezoelectric‐potential‐driven internal electric field and their effect on charge transfer behavior are investigated.