Oxygen-vacancy-enhanced piezo-photocatalytic performance of AgNbO3. (1st January 2022)

• Record Type: Journal Article
• Authors: Li, Li; Ma, Yanran; Chen, Gaifang; Wang, Jingsong; Wang, Chunchang
• Is Part Of: Scripta materialia. Number 206(2022)
• Publication Date: 2022-01-01
• Subjects: Hydrothermal -- AgNbO3 -- Piezo-photocatalysis -- Oxygen vacancy -- Degradation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.114234
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Piezo-photocatalysis (implement by ultrasound vibration and UV-vis light irradiation), a new-emerging strategy, can suppress the rapid recombination of electrons and holes to enhance the catalytic performance. The modulation of interface structures (e.g., the introduction of oxygen vacancies, OVs) plays a significant role in the charge-transfer and the catalytic activity. In this paper, the AgNbO3 (ANO) powder was prepared by a facile hydrothermal method. Based on this, we introduce OVs into ANO successfully by annealing in N2 (ANO-N2 ). The ANO-N2 with OVs exhibits much better piezo-photocatalytic activity for degradation of Rhodamine B (RhB) than the ANO. The result found that OVs can narrow the band gap and improve the UV-vis light absorption, and most importantly, promote the separation of electron hole pairs under electric field to enhance the piezo-photocatalytic performance. The work thus supplies an in-depth understanding of the mechanism between OVs and piezo-photocatalytic performance. Graphical abstract: Image, graphical abstract