Harvesting the Vibration Energy of BiFeO3 Nanosheets for Hydrogen Evolution. (18th July 2019)

• Record Type: Journal Article
• Authors: You, Huilin; Wu, Zheng; Zhang, Luohong; Ying, Yiran; Liu, Yan; Fei, Linfeng; Chen, Xinxin; Jia, Yanmin; Wang, Yaojin; Wang, Feifei; Ju, Sheng; Qiao, Jinli; Lam, Chi‐Hang; Huang, Haitao
• Is Part Of: Angewandte Chemie. Volume 131:Number 34(2019)
• Page Start: 11905
• Page End: 11910
• Publication Date: 2019-07-18
• Subjects: BiFeO3 -- Energieumwandlung -- Piezokatalyse -- Wasserstoff; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201906181
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: In this study, mechanical vibration is used for hydrogen generation and decomposition of dye molecules, with the help of BiFeO3 (BFO) square nanosheets. A high hydrogen production rate of ≈124.1 μmol g −1 is achieved under mechanical vibration (100 W) for 1 h at the resonant frequency of the BFO nanosheets. The decomposition ratio of Rhodamine B dye reaches up to ≈94.1 % after mechanical vibration of the BFO catalyst for 50 min. The vibration‐induced catalysis of the BFO square nanosheets may be attributed to the piezocatalytic properties of BFO and the high specific surface area of the nanosheets. The uncompensated piezoelectric charges on the surfaces of BFO nanosheets induced by mechanical vibration result in a built‐in electric field across the nanosheets. Unlike a photocatalyst for water splitting, which requires a proper band edge position for hydrogen evolution, such a requirement is not needed in piezocatalytic water splitting, where the band tilting under the induced piezoelectric field will make the conduction band of BFO more negative than the H2 /H2 O redox potential (0 V) for hydrogen generation. Abstract : Schwingt im richtigen Takt : BiFeO3 kann als Piezokatalysator für die Wasserstoffproduktion dienen, indem Schwingungsenergie aus der Umgebung aufgenommen wird. Das starke, durch mechanische Schwingungen induzierte piezoelektrische Feld verschiebt das Leitungsband von BiFeO3, womit es negativer als das H2 /H2 O‐Redoxpotential wird und die Wasserstoffentwicklung ermöglicht.