Liu Xuechen, Wang Mingwen, Zhou Yuanyi, Li Tao, Duan Hongxu, Li Jinglei, Wang Linghang, Li Yang, Yang Shuai, Wu Jie, Wang Chao, Feng Xinya, Li Fei
Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education and State Key Laboratory for Mechanical Behavior of Materials, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
The Fifth Affiliated Hospital of Jinan University, Heyuan, 517000, China.
Small. 2023 Dec;19(49):e2303129. doi: 10.1002/smll.202303129. Epub 2023 Aug 24.
Piezocatalysis has increasingly gained prominence due to its enormous potential for addressing energy shortages and environmental pollution issues. Nonetheless, the low piezocatalytic activity of state-of-the-art materials seriously inhibits the practical applications of piezocatalysis. Here, it is proposed to greatly enhance the piezocatalytic activity for a perovskite ferroelectric, i.e., Sm-doped 0.68Pb(Mg Nb )-0.32PbTiO (Sm-PMN-PT, a solid solution with ultrahigh piezoelectricity), by introducing oxygen vacancies (OVs). The results show that the presence of OVs promotes the production of reactive oxygen species while enhancing the adsorption and activation of organic pollutants to improve piezocatalytic performance. The OV-Sm-PMN-PT is found to possess a superior piezocatalytic degradation rate constant of 0.073 min under ultrasonic vibration, which is ≈4.9 times higher than that of pristine Sm-PMN-PT. Furthermore, the OV-Sm-PMN-PT can efficiently remove RhB under 400 rpm stirring, making it a promising candidate for water purification using low-frequency mechanical energy from nature. This research sheds light on the design of piezocatalytic materials via defect engineering.
由于压电催化在解决能源短缺和环境污染问题方面具有巨大潜力，它越来越受到关注。然而，现有材料的低压电催化活性严重阻碍了压电催化的实际应用。在此，通过引入氧空位（OVs），提出大幅提高钙钛矿铁电体即Sm掺杂的0.68Pb(Mg Nb )-0.32PbTiO （Sm-PMN-PT，一种具有超高压电性的固溶体）的压电催化活性。结果表明，氧空位的存在促进了活性氧物种的产生，同时增强了对有机污染物的吸附和活化，从而提高了压电催化性能。发现OV-Sm-PMN-PT在超声振动下具有0.073 min的优异压电催化降解速率常数，约为原始Sm-PMN-PT的4.9倍。此外，OV-Sm-PMN-PT在400 rpm搅拌下能有效去除罗丹明B，使其成为利用自然界低频机械能进行水净化的有前景的候选材料。本研究为通过缺陷工程设计压电催化材料提供了思路。
