Harvesting the Vibration Energy of BiFeO3 Nanosheets for Hydrogen Evolution

Huilin You, Zheng Wu, Luohong Zhang, Yiran Ying, Yan Liu, Linfeng Fei, Xinxin Chen, Yanmin Jia, Yaojin Wang, Feifei Wang, Sheng Ju, Jinli Qiao, Chi Hang Lam, Haitao Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

52 Citations (Scopus)

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/H2O redox potential (0 V) for hydrogen generation.

Original languageEnglish
Pages (from-to)11779-11784
Number of pages6
JournalAngewandte Chemie - International Edition
Volume58
Issue number34
DOIs
Publication statusPublished - 1 Jan 2019

Keywords

  • BiFeO
  • energy conversion
  • hydrogen
  • piezocatalysis

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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