TY  - JOUR
AU  - Han, Jun
AU  - Tian, Wenrou
AU  - Miao, Ye
AU  - Li, Najun
AU  - Chen, Dongyun
AU  - Xu, Qingfeng
AU  - Li, Hua
AU  - Lu, Jianmei
PY  - 2024
TI  - Flexoelectricity in hydroxyapatite for the enhanced piezocatalytic degradation of phenanthrene in soil
JO  - Industrial Chemistry & Materials
SN  - 2755-2608
SP  - 300
EP  - 308
VL  - 2
IS  - 2
AB  - Coupling the effects of flexoelectricity with piezoelectricity has been proved to effectively harvest mechanical energy. In this study, a composition-graded core–shell structure (HAP@FAP) was prepared by surface-gradient F-doping in hydroxyapatite, which could introduce flexoelectricity by a built-in strain gradient. A flexoelectric-boosted piezoelectric response was demonstrated by piezoresponse force microscopy (PFM) characterization, showing that the piezoelectric constant of HAP@FAP was increased by 2.25 times via a lattice strain gradient induced by chemical heterogeneities derived from the unique composition-graded core–shell structure. Thus, the piezocatalytic activity of HAP@FAP for phenanthrene (PHE) degradation in soil was enhanced. This work provides a new strategy for the modification of piezoelectric catalysts for the remediation of organics-contaminated soils on industrial land.
UR  - https://doi.org/10.1039/d3im00093a
DO  - 10.1039/d3im00093a