Interface engineering via temperature-dependent self-transformation on SnS2/SnS for enhanced piezocatalysis
Heterojunction has been widely used in vibration-driven piezocatalysis for enhanced charges sepa-ration,while the weak interfaces seriously affect the efficiency during mechanical deformations due to prepared by traditional step-by-step methods.Herein,the intimate contact interfaces with shared S atoms are ingeniously constructed in SnS2/SnS anchored on porous carbon by effective interface engineering,which is in-situ derived from temperature-dependent self-transformation of SnS2.Ben-efiting from intimate contact interfaces,the piezoelectricity is remarkably improved due to the larger interfacial dipole moment caused by uneven distribution of charges.Importantly,vibra-tion-induced piezoelectric polarization field strengthens the interfacial electric field to further pro-mote the separation and migration of charges.The dynamic charges then transfer in porous carbon with high conductivity and adsorption for significantly improved piezocatalytic activity.The degra-dation efficiency of bisphenol A(BPA)is 6.3 times higher than SnS2 and H2 evolution rate is in-creased by 3.8 times.Compared with SnS2/SnS prepared by two-step solvothermal method,the degradation efficiency of BPA and H2 evolution activity are increased by 3 and 2 times,respectively.It provides a theoretical guidance for developing various multiphase structural piezocatalyst with strong interface interactions to improve the piezocatalytic efficiency.
PiezocatalysisSelf-transformationPhase junctionInterfacial fieldPolarized field
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