Interface-modified Two-dimensional Palladium-based Nanomaterials And Their Catalytic Properties

To solve the growingly serious energy shortage and environmental issue,it is of great importance to develop efficient and eco-friendly nanomaterials for energyconversion.Among these nanomaterials,inorganic nanomaterials have attracted extensive attention because of their unique performance.Although the regulation and synthesis of inorganic nanomaterials have made great progress in recent decades,there is plenty of room on the interfacial modification of inorganic nanomaterials to improve their catalytic activity and selectivity.In view of this,this thesis focuses on the interfacial modification of inorganic nanomaterials and their application in energy conversion.The major contents are summarized as follows:Chapter 1:We first introduce the basic properties of inorganic nanomaterials and then summary their applications in energy conversion.The important roles the interfaces of nanomaterials play in energy conversion are also mentioned.The significance and content of this thesis are given at last.Chapter 2:Electrochemical reduction of carbon dioxide to methanol on hierarchical Pd/SnO2 nanosheets with abundant Pd-O-Sn interfaces.In this chapter,we partially modified the ultrathin Pd nanosheets with SnO2 nanoparticles.With this treatment,Pd nanosheets not only overcame the poison effect of CO,but also enhanced both the physical and chemical adsorption of CO2.More importantly,we built interfacial electron channel by fabricating the metal-oxide interface of Pd-O-Sn to realize the CO2 multi-electron transfer to produce CH3OH effectively.Chapter 3:Electrochemical reduction of nitrogen to ammonia on active and superhydrophobic electrode of Pd-Mo3S13 nanosheets supported on HPGR.In this chapter,we modified the Pd nanosheets with the(NHa)ZMo3Sis clusters.With the reaction of polysulfide ion and palladium,we introduced Mo sites for activating N2 successfully to get the Pd-Mo3S13 nanosheets.Meanwhile,we supported the Pd-Mo3S13 nanosheets on superhydrophobic HPGR to further improve the activity of N2 reduction by suppressing the hydrogen evolution in solution.Finally,we realized efficient N2 electroreduction to ammonia by the synergistic effect of active sites and superhydrophobic interface.Chapter 4:Finally,we draw a conclusion for this thesis and point out a new and rational route to realize efficient energy conversion by creating active interface based on inorganic nanomaterials.Furthermore,an outlook for the design and synthesis of next generation inorganic nanomaterials was provided.