| Affiliation: | 1. College of Materials Science and Engineering, Sichuan University, Chengdu, 610065 China College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066 China;2. College of Materials Science and Engineering, Sichuan University, Chengdu, 610065 China;3. Institute for Advanced Study, Chengdu University, Chengdu, 610106 China;4. Department of Orthopedics, West China Hospital, Sichuan University, Chengdu, 610041 China;5. College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066 China |
| Abstract: | Although the piezo-catalysis is promising for the environmental remediation and biomedicine, the piezo-catalytic properties of various piezoelectric materials are limited by low carrier concentrations and mobility, and rapid electron-hole pair recombination, and reported regulating strategies are quite complex and difficult. Herein, a new and simple strategy, integrating phase boundary engineering and defect engineering, to boost the piezo-catalytic activity of potassium sodium niobate ((K, Na)NbO3, KNN) based materials is innovatively proposed. Tur strategy is validated by exampling 0.96(K0.48Na0.52)Nb0.955Sb0.045O3-0.04(BixNa4-3x)0.5ZrO3-0.3%Fe2O3 material having phase boundary engineering and conducted the defect engineering via the high-energy sand-grinding. A high reaction rate constant k of 92.49 × 10−3 min−1 in the sand-grinding sample is obtained, which is 2.40 times than that of non-sand-grinding one and superior to those of other representative lead-free perovskite piezoelectric materials. Meanwhile, the sand-grinding sample has remarkable bactericidal properties against Escherichia coli and Staphylococcus aureus. Superior piezo-catalytic activities originate from the enhanced electron-hole pair separation and the increased carrier concentration. This study provides a novel method for improving the piezo-catalytic activities of lead-free piezoelectric materials and holds great promise for harnessing natural energy and disease treatment. |
