Abstract
A strong piezo-electrochemical effect is realized in hydrothermally synthesized multiferroic BiFeO3 micro-sheets via the product of the piezoelectric effect and the electrochemical redox effect. A novel mechanocatalysis originating from the piezo-electrochemical effect is designed to decompose dye wastewater under vibration condition on the basis of the following mechanism: When subjected to mechanical vibration, the BiFeO3 micro-sheets' surfaces will generate a large number of positive and negative electrical charges due to the piezoelectric effect of multiferroic materials, which further induces the chemical redox decomposition reaction in dye wastewater. A~95% mechanocatalytic decomposition ratio of BiFeO3 is achieved for a Rhodamine B wastewater (~10mg/L) and there is almost no decrease of mechanocatalytic performance after recycling BiFeO3 catalysts for five times. Strong oxidation middle active species, such as OH•, were also observed, which suggested the strong piezo-electrochemical coupling in BiFeO3 micro-sheets. Piezo-electrochemical mechanocatalysis of BiFeO3 micro-sheets has potential in developing a non-toxic, highly efficient and reusable technology for chemical catalysis by using environmental vibration waste energy.
Published Version
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