Wang Xuzong, Lyu Jing, Wang Xin, Zou Anqi, Chen Qiang, Lv Xiang, Wu Jiagang
College of Materials Science and Engineering, Sichuan University, Chengdu 610065, P. R. China.
National University of Singapore (Chongqing) Research Institute, Chongqing 401123, P. R. China.
ACS Appl Mater Interfaces. 2024 Oct 2;16(39):52624-52632. doi: 10.1021/acsami.4c10108. Epub 2024 Sep 22.
Reducing the level of annihilation of electrons and holes is considered to be a feasible strategy to promote piezocatalytic activities. But this strategy is only achieved through cumbersome sample preparation technologies, hindering its practical applications. Herein, we introduce a simple and efficient technique, the conventional solid-state method, to engineer a composite interfacial electric field to solve this problem, and validate it in a composite piezocatalysis composed of potassium sodium niobate ((K, Na)NbO, KNN) and multiwalled carbon nanotubes (MWCNTs). The KNN-1CNT sample, a piezocatalyst doped with 1 wt % MWCNTs, shows a degradation rate () of 127 × 10 min for Rhodamine B (RhB) dye and a hydrogen peroxide (HO) production rate of 36 μmol/h, about 27 times more than a reported ferroelectric composite piezocatalyst. The excellent piezocatalytic activities are attributed to the good crystallinity, slightly increased oxygen vacancies, and especially the optimal composite interface electric field. Therefore, our proposed method provides a paradigm for obtaining large-scale perovskite piezocatalysts with high piezocatalytic activities.
降低电子和空穴的湮灭水平被认为是提高压电催化活性的一种可行策略。但这种策略只能通过繁琐的样品制备技术来实现，这阻碍了其实际应用。在此，我们引入一种简单高效的技术——传统固态法，来构建复合界面电场以解决这一问题，并在由铌酸钾钠（(K, Na)NbO₃，KNN）和多壁碳纳米管（MWCNTs）组成的复合压电催化体系中进行了验证。KNN-1CNT样品是一种掺杂了1 wt% MWCNTs的压电催化剂，对罗丹明B（RhB）染料的降解速率（）为127×10⁻³ min⁻¹，过氧化氢（H₂O₂）产率为36 μmol/h，约为已报道的铁电复合压电催化剂的27倍。优异的压电催化活性归因于良好的结晶度、略有增加的氧空位，尤其是最佳的复合界面电场。因此，我们提出的方法为获得具有高压电催化活性的大规模钙钛矿压电催化剂提供了一种范例。
