成果归属作者：

安琪 ; 胡应模 ; 李晓薇

成果归属机构：

材料科学与工程学院

作者：

Zhuang, Jialin ; Wang, Lingchao ; Hu, Yingmo ; Wang, Yechen ; Lin, Liping ; Xiao, Jiaying ; Chen, Yunfan ; Li, Xiaowei ; Liu, Huiqiang ; Zhang, Qian ; An, Qi

单位：

China Univ Geosci Beijing, Sch Mat Sci & Technol, Natl Lab Mineral Mat, Beijing Key Lab Mat Utilizat Nonmet Minerals & Sol, Engn Res Ctr, Minist Educ Geol Carbon Storage & Low, Beijing 100083, Peoples R China;Shandong Univ Technol, Sch Resources & Environm Engn, Zibo, Peoples R China;Shandong Univ Technol, Sch Phys & Optoelect Engn, Zibo, Peoples R China

摘要：

Photopiezocatalysts can take advantage of both solar light and environmental mechanical energy, thus holding high significance in building a sustainable society. However, designing highly potent photopiezocatalysts remains challenging. In this study, we propose an asymmetric ternary heterojunction as an efficient strategy for achieving effective photopiezocatalysts. A BTO/PPy/TiO2 catalyst composed of Bi4Ti3O12 (BTO) and TiO2 nanosheets and polypyrrole (PPy) nanoparticles presents both enhanced asymmetric interfacial charge separation and deformability under mechanical stimuli, which result in appealing photopiezocatalytic capabilities. The stresses applied to the piezoelectric material lead to charge separation, and the ternary BTO/PPy/TiO2 heterojunction has a higher deformation capacity than the binary BTO/TiO2 heterojunction, which leads to higher fluctuating electric fields. Therefore, the d(33) value of BTO/PPy/TiO2 is 3.1 times higher than that of BTO/TiO2. In situ synchrotron-radiation-IR measurements indicate that electric fields excite electrons to higher energy levels and lead to larger electron densities in the heterojunction. Piezoelectric fields also enhance charge separation. Using cycled assembly, ternary BTO/PPy/TiO2 heterojunctions were facilely constructed on a copper mesh substrate, and their applications in effective photopiezocatalytic degradation reactions are demonstrated. BTO/PPy/TiO2 degraded rhodamine B (RhB) solution by 96% with a k value 2.92 times higher than that of BTO/TiO2. This study elucidates the mechanism underlying efficient energy conversion and application in photopiezocatalytically active asymmetric heterojunctions and inspires the design of efficient catalysts.

基金：

NSFC [22272152, 21922203]; Fundamental Research Funds for the Central Universities [2652022202]; Beijing Nova project [20220484155]; Open Project of State Key Laboratory of Supramolecular Structure and Materials [SKLSSM 202402]

语种：

英文

DOI：

10.1039/d4ta03759f

来源：

JOURNAL OF MATERIALS CHEMISTRY A,2024():.

出版日期：

2024-07-31

提交日期：

2024-08-21

引用参考：

Zhuang, Jialin; Wang, Lingchao; Hu, Yingmo; Wang, Yechen; Lin, Liping; Xiao, Jiaying; Chen, Yunfan; Li, Xiaowei; Liu, Huiqiang; Zhang, Qian; An, Qi. High photopiezocatalytic energy conversion via effective charge separation and deformability in the asymmetric ternary heterojunction Bi₄Ti₃O₁₂/PPy/TiO₂[J]. JOURNAL OF MATERIALS CHEMISTRY A,2024():.