Amorphous/Crystalline Interface of Bi/Bi <sub>4</sub> NbO <sub>8</sub> Cl Heterostructure for Improved Piezo‐Photocatalysis
Shangyong Wang, Yongjin Li, Zhifeng Li, Liang Xu, Zhaoyi Yin, Jianbei Qiu, Zhengwen Yang, Zhiguo Song
Abstract
Abstract Efficient separation of photogenerated charges at the surface of photocatalysts is vital for achieving high photocatalytic activity. Here, a Bi/Bi 4 NbO 8 Cl heterostructure piezo‐photocatalyst with an amorphous/crystalline interface (acBi/BNC) is prepared by in situ reduction using Bi 4 NbO 8 Cl as a self‐sacrificial template. This ingenious design synergistically utilizes the advantages of the amorphous/crystalline interface structure, localized surface plasmon resonance effect, and piezoelectric field. The formation of amorphous/crystalline interfaces induces the generation of oxygen vacancies, and subsequently lattice distortions, thus improving the piezoelectric properties. Theoretical and experimental results demonstrate that the combination of piezoelectric field and amorphous/crystalline interface promotes the effective separation and migration of photogenerated charges between the bulk and surface of the catalysts. Under simultaneous light and ultrasound, the optimal heterostructure (acBi/BNC‐3) exhibit superior photodegradation efficiency of tetracycline reached 80% within 5 min, and the reaction rate (2.78 × 10 −1 min −1 ) is 7.8 and 5.4 times that of pure Bi 4 NbO 8 Cl (BNC) and crystalline Bi/Bi 4 NbO 8 Cl (cBi/BNC), respectively. Furthermore, the piezo‐photocatalytic tetracycline degradation efficiency surpasses those under individual photocatalysis and piezocatalysis conditions. This work provides a novel rational design to improve the spatial charge separation of Bi‐based catalysts and prepare high‐performance piezo‐photocatalysts via interface engineering.