2D/2DMXene/ TiO₂-MoS₂异质结构的构建及其高效析氧反应

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中图分类号：0643.36 文献标志码：A

Abstract：A 2D/2D MXene/ TiO2 MoS2 heterostructure was fabricated via wet etching. The structure was characterized using X-raydiffraction（XRD），X-rayphotoelectronspectroscopy（XPS），scannng electronmicroscopy（SEM），transmissionelectron microscopy（TEM），andhigh-resolution transmission electronmicroscopy（HRTEM）.Andthe electrochemicalpropertiesoftheheterostructure were investigatedaswellItisfoundthat wet-etching yieldsfewlayerof2DMXene nanosheets， which could provide a larger surface area for the growth of ultrathin 2D MoS2 nanosheets.The MoS2 nanosheets tend to grow verticallyonthe MXene nanoshets，therebyofferingagreatersurfaceareaandmoreexposedactivesites.Some MXene nanosheets are in-situ derived into TiO2 nanoparticles，forming a rich heterogeneous interface between MXene， TiO2 and （20 MoS2 ．And these interfaces modulatetheelectronic structureofthe heterostructure，effectivelyimproving itscharge transfer efficiency，thereby improving thecatalytic activityand stability of the material.The2D/2D MXene/ Δ′TiO2 ⋅MoS2 heterostructure exhibits remarkable oxygen evolution reaction（OER）performance，with an overpotential of only 376mV at a current density of 50mA/cm2 .Aftera 40h constant voltage stability test，the voltage retention rate reaches 99.2% ：

Keywords：MXene material；2D/2D heterostructure；in situ derivatization；oxygen evolution reaction

氢能被视作构建未来可持续能源体系的核心要素[1-3]，电化学水分解技术中阳极端的析氧反应（OER）涉及复杂的四电子转移过程，这一过程制约了整体水裂解系统的能量转换效率[4-5]。（剩余10220字）