Piezo-photocatalytic interfacial charge regulation in batch-produced PVDF@MOF/Pt core-sheath nanofibrous membranes

● Core-sheath nanofibers fabricated via batch coaxial electrospinning. ● Polarization-induced band bending regulates MOF/Pt interface. ● PVDF piezopotential drives directional interfacial charge separation. ● Photo-piezo coupling enhances H 2 O 2 production. ● Multiscale evidence supports polarization-mediated charge regulation. Regulating interfacial charge separation and oxygen reduction process in heterogeneous nanostructures remains a fundamental challenge for photocatalytic hydrogen peroxide (H 2 O 2 ) generation. Herein, we construct a spatially organized core-sheath nanofibrous architecture composed of a piezoelectric poly(vinylidene fluoride) (PVDF) core and a UiO-66-NH 2 (Hf)/platinum (Pt) functionalized sheath, enabling dynamic modulation of interfacial band alignment under coupled mechanical and photoexcitation. Strain-induced polarization within the PVDF core generates a transient internal electric field that cooperates with photogenerated charge carriers in the metal-organic framework (MOF)/Pt sheath, thereby favoring interfacial charge separation and Pt-assisted electron trapping while suppressing charge recombination. Comprehensive electrochemical analysis, valence band spectroscopy, piezoresponse force microscopy, electron spin resonance, and finite element simulations consistently reveal that polarization-mediated band bending facilitates electron extraction across the MOF/Pt interface and promotes a hydrogen-peroxide-oriented oxygen reduction process. Under simultaneous light irradiation and mechanical stimulation, the optimized membrane achieves enhanced hydrogen peroxide production of approximately 90 μM within 120 min, together with efficient degradation of representative organic pollutants. By coupling batch-controllable structural fabrication with polarization-mediated interfacial electronic regulation, this study provides a reproducible core-sheath platform and mechanistic insight into polarization-regulated oxygen reduction in composite nanofibrous membranes. Download: Download high-res image (237KB) Download: Download full-size image