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Ultrahigh Piezocatalytic Performance of Perovskite Ferroelectric Powder via Oxygen Vacancy Engineering
Small ( IF 13.0 ) Pub Date : 2023-08-24 , DOI: 10.1002/smll.202303129
Xuechen Liu 1 , Mingwen Wang 1 , Yuanyi Zhou 2 , Tao Li 3 , Hongxu Duan 3 , Jinglei Li 1 , Linghang Wang 1 , Yang Li 1 , Shuai Yang 1 , Jie Wu 1 , Chao Wang 1 , Xinya Feng 1 , Fei Li 1
Small ( IF 13.0 ) Pub Date : 2023-08-24 , DOI: 10.1002/smll.202303129
Xuechen Liu 1 , Mingwen Wang 1 , Yuanyi Zhou 2 , Tao Li 3 , Hongxu Duan 3 , Jinglei Li 1 , Linghang Wang 1 , Yang Li 1 , Shuai Yang 1 , Jie Wu 1 , Chao Wang 1 , Xinya Feng 1 , Fei Li 1
Affiliation
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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(Mg1/3Nb2/3)-0.32PbTiO3 (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−1 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.
中文翻译：
通过氧空位工程实现钙钛矿铁电粉末的超高压电催化性能
压电催化由于其解决能源短缺和环境污染问题的巨大潜力而日益受到重视。然而，最先进材料的低压电催化活性严重抑制了压电催化的实际应用。在此，提出大大提高钙钛矿铁电体的压电催化活性，即Sm掺杂0.68Pb(Mg 1/3 Nb 2/3 )-0.32PbTiO 3 (Sm-PMN-PT，一种具有超高压的固溶体) ），通过引入氧空位（OV）。结果表明，OVs的存在促进了活性氧的产生，同时增强了有机污染物的吸附和活化，从而提高了压电催化性能。 OV-Sm-PMN-PT被发现在超声波振动下具有0.073 min -1的优异压电催化降解速率常数，比原始Sm-PMN-PT高约4.9倍。此外，OV-Sm-PMN-PT 可以在 400 rpm 搅拌下有效去除 RhB，使其成为利用自然界低频机械能净化水的有前途的候选者。这项研究揭示了通过缺陷工程设计压电催化材料。
更新日期：2023-08-24
中文翻译：
通过氧空位工程实现钙钛矿铁电粉末的超高压电催化性能
压电催化由于其解决能源短缺和环境污染问题的巨大潜力而日益受到重视。然而，最先进材料的低压电催化活性严重抑制了压电催化的实际应用。在此，提出大大提高钙钛矿铁电体的压电催化活性，即Sm掺杂0.68Pb(Mg 1/3 Nb 2/3 )-0.32PbTiO 3 (Sm-PMN-PT，一种具有超高压的固溶体) ），通过引入氧空位（OV）。结果表明，OVs的存在促进了活性氧的产生，同时增强了有机污染物的吸附和活化，从而提高了压电催化性能。 OV-Sm-PMN-PT被发现在超声波振动下具有0.073 min -1的优异压电催化降解速率常数，比原始Sm-PMN-PT高约4.9倍。此外，OV-Sm-PMN-PT 可以在 400 rpm 搅拌下有效去除 RhB，使其成为利用自然界低频机械能净化水的有前途的候选者。这项研究揭示了通过缺陷工程设计压电催化材料。
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