助催化剂工程减弱Au-Bi4Ti3O12上的电荷屏蔽效应，用于压电催化纯水分解,Catalysis Science & Technology

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助催化剂工程减弱Au-Bi4Ti3O12上的电荷屏蔽效应，用于压电催化纯水分解
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2022-11-08 , DOI: 10.1039/d2cy01422j
Rui Lei ₁ , Xianzhi Fu ₁ , Naxin Chen ₂ , Yifeng Chen ₂ , Wenhui Feng ₃ , Ping Liu ₁

Affiliation

微弱的驱动力和快速的载流子复合严重制约了压电催化的开发和利用，但重要的原因是电荷屏蔽效应。在此，根据Au纳米颗粒在BTO不同晶面上的沉积构建了双电场驱动的压电催化系统。由于Au和BTO之间不匹配的功函数，可以在界面处形成肖特基结，导致BTO表面的耗尽区具有降低的电荷密度。因此，由于不平衡的电荷分布，建立了从 BTO 表面到内部的内置电场。在压电催化过程中，内置电场可以辅助压电场分离载流子，增加了载流子迁移路径，削弱了屏蔽作用，减少了载流子的复合。同时，Au还可以为电子还原反应提供活性位点。在 BTO 压电场和 Au 纳米粒子的协同作用下，Au-BTO 实现了高 H₂产率为194.67 μmol h^-1 g^-1，伴随着高添加的H₂ O₂的产生。这项工作为设计高效的压电催化剂提供了一条新途径。

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Cocatalyst engineering to weaken the charge screening effect over Au–Bi4Ti3O12 for piezocatalytic pure water splitting

The weak driving force and rapid carrier recombination severely restrict the development and utilization of piezocatalysis, but the important reason is the charge screening effect. Herein, a dual electric field driven piezoelectric catalytic system was constructed according to deposition of Au nanoparticles on the different crystal planes of BTO. Owing to the unmatched work function between Au and BTO, a Schottky junction at the interface could be formed, resulting in a depletion region at the BTO surface with a reduced charge density. Thus, a built-in electric field from the surface of BTO to the inside is established due to the unbalanced charge distribution. In the process of piezocatalysis, the built-in electric field could assist the piezoelectric field to separate carriers, which increases the carrier migration path, weakens the shielding effect and reduces the recombination of carrier. Meanwhile, Au could also supply the active site for the electron reduction reaction. Under the cooperation of the piezoelectric field of BTO and Au nanoparticles, Au–BTO achieved an elevated H₂ production rate of 194.67 μmol h⁻¹ g⁻¹, accompanied by high-added H₂O₂ production. This work provides a new route for designing efficient piezocatalysts.

更新日期：2022-11-08

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