Self‐Assembled LaFeO3/ZnFe2O4/La2O3 Ultracompact Hybrids with Enhanced Piezo‐Phototronic Effect for Oxygen Activation in Ambient Conditions

Abstract Piezoelectric polarization portrays a promising technology to regulate the photogenerated charge carrier separation and transfer behaviors, and the design of multifunctional catalysts with piezo‐phototronic effect is a key step. One strategy is to prepare a composite catalyst combining the ideal properties from each individual component. Herein, a facial dopant‐induced self‐assembling strategy is reported to fabricate an ultracompact nanocomposite (LaFeO 3 /ZnFe 2 O 4 /La 2 O 3 ) with enhanced efficiency for piezo‐photocatalysis. The composite is synthesized at 800 °C from the one‐pot method, thus the self‐constructed interface is created during multi‐phase formation, providing the intimate grain‐to‐grain contact between the semiconductive LaFeO 3 and piezoelectric ZnFe 2 O 4 /La 2 O 3 phases. In such a composite, a synergistic effect for oxygen activation is realized via the effective manipulation of the photogenerated charge carrier separation and spatial transportation through the vibration‐created piezopotential. A high piezoelectric coefficient (d 33 ) up to 826 pm V −1 and a superior H 2 O 2 yield of 403 µmol g −1 h −1 (in open air and pure water) are achieved on the optimized composite, outperforming most of the reported lead‐free piezo‐photocatalyst. The ultracompact composite is very robust without any decay in H 2 O 2 ‐delivering capability after many cyclic tests. This study provides a universal strategy for the rational design of high‐performance piezo‐photocatalysts.