Construction of energy storage heterojunction and enhancement mechanism of dark and full-spectrum energy storage piezoelectric catalysis
Bixin Zhang, Guoqiang Tan, Wenlong Liu, Xiongtao Wu, Linxin Guo, Zeqiong Wang, Chunyan Zeng, Ying Liu, Tian Liu, Qian Yang, Ao Xia, Huijun Ren, Yuanting Wu, Min Wang, Kai Qi, Sizhe Fan, Liaona She, Yaxiong Yang, Fan Gao
Abstract
BiOBr/BiO(IO 3 ) 1-x-y (I 3 ) x I y energy storage heterojunction crystals are prepared by heterophase nucleation hydrothermal crystallization using piezoelectric and pyroelectric effects. Charge migration and drift formed by piezoelectric and pyroelectricity are stored into BiO(IO 3 ) 1-x-y (I 3 ) x I y and BiOBr crystals, storing 91.55 and 127.08 μmol⋅g −1 of electrons and holes. The formation of the built-in electric field at the interface enhances the polarization electric field of the energy storage heterojunction, and its piezoelectric d 33 value increases to 3.68 nm⋅V −1 . FEM simulations verify that the heterojunction interface to the crystal generates a piezoelectric potential difference and reverse piezoelectric current, charge migration and drift storage to the crystal. Applying mechanical stress under darkness the heterojunction can release the stored charge to form high-energy radicals and form piezoelectric charges to degrade pollutants, which has good dark cycle stability, dark broad-spectrum degradation and dark catalytic ability to be repairable. The stored charge piezoelectric photocatalysis, piezoelectric photocatalysis and piezoelectric catalytic synergy of heterojunctions under simulated solar/near-infrared light resulted in the formation of piezoelectric high-energy thermo radicals h + , ⋅OH, ⋅O 2 – , and 1 O 2 for the rapid degradation of pollutants. The present work provides new ideas for the structural design of piezoelectric crystals to build energy storage heterojunction catalysts and to realize efficient dark-full-spectrum catalytic applications.