Multi-Interface polarization engineering constructed 1T-2H MoS2 QDs/Y-NaBi(MoO4)2 multiple heterostructure for high-efficient piezoelectric-photoelectrocatalysis PDE-5i degradation

The rational application of piezoelectric polarization properties in non-centrosymmetric heterojunctions to improve charge separation efficiency is a novel approach for enhancing their photoelectrocatalytic capabilities for environmental purification. Herein, a noval 1T-2H MoS2 QDs/Y-NaBi(MoO4)2 multiple heterostructures with two types S-scheme heterojunctions was formed by multi-functional materials NaBi(MoO4)2 with Y3+ ion-doping and multi-phase state (1T, 2H and 1T-2H) MoS2 quantum dots multi-interface polarization engineering. Material characterization and DFT calculations revealed that 1T-2H MoS2 QDs/Y-NaBi(MoO4)2 multiple heterostructures produce highly-efficient Bi-S-Mo(IV) and Mo(IV)-S-Mo(VI) charge-transfer channels induced by multi-interface polarization engineering. 1T-2H MoS2 QDs/Y-NaBi(MoO4)2 heterostructures were developed as photoanodes using the pressed tablet stainless-steel mesh (PT-SSM) method, and demonstrated conspicuous piezoelectric-photoelectrocatalytic (PZ-PEC) efficiency (99.88% removal within 40 min) for the degradation of organic pollutant phosphodiesterase-5 inhibitor (PDE-5i) under visible light illumination, direct-current external bias and mechanical force. This work provides new insight for synergy and mechanism between piezoelectric effect and photoelectrocatalysis for environmental clean-up.