Liu Xuechen, Wang Mingwen, Li Yang, Li Xuexin, Zhang Jinjing, Yang Shuai, Wu Jie, Wang Linghang, Li Jinglei, 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.
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.
J Colloid Interface Sci. 2025 Jan 15;678(Pt B):246-255. doi: 10.1016/j.jcis.2024.09.025. Epub 2024 Sep 3.
Piezocatalysis offers an encouraging alternative for the sustainable, on-demand, and decentralized production of hydrogen peroxide (HO), underscoring the importance of enhancing piezocatalytic efficiency. Enhancing piezocatalysts through defect engineering has shown considerable potential in boosting HO production efficiency. However, the impact of oxygen vacancies on piezocatalytic activity remains unclear. Herein, we used a chemical probe method to quantify negative charges (q) and superoxide radicals (O) to explore the relation between the oxygen vacancy concentration and piezocatalytic performance of bismuth titanate (BiTiO) based catalysts. Results indicate that piezocatalytic HO production in pure water demonstrates a volcanic trend with increasing oxygen vacancy concentration. This trend is attributed to the dual role of oxygen vacancies, which reduce the piezoelectric property of the piezocatalyst while simultaneously increasing the concentration of O, which is crucial for HO formation through the O reduction pathway. This study provides insights into the interplay between oxygen vacancies, piezoelectric properties, and piezocatalytic activity, offering valuable guidance for the design of piezocatalysts for sustainable HO production.
压电催化为可持续、按需且分散地生产过氧化氢（H₂O₂）提供了一种令人鼓舞的替代方法，凸显了提高压电催化效率的重要性。通过缺陷工程增强压电催化剂在提高H₂O₂生产效率方面已显示出巨大潜力。然而，氧空位对压电催化活性的影响仍不明确。在此，我们使用化学探针方法来量化负电荷（q）和超氧自由基（O₂⁻），以探究钛酸铋（BiTiO）基催化剂的氧空位浓度与压电催化性能之间的关系。结果表明，在纯水中，压电催化H₂O₂的产生随着氧空位浓度的增加呈现出火山形趋势。这种趋势归因于氧空位的双重作用，它降低了压电催化剂的压电性能，同时增加了O₂⁻的浓度，而O₂⁻对于通过O₂⁻还原途径形成H₂O₂至关重要。本研究深入了解了氧空位、压电性能和压电催化活性之间的相互作用，为设计用于可持续H₂O₂生产的压电催化剂提供了有价值的指导。
