The Constructions Of Heterogeneous Interfaceofordered Molybdenum Compounds And The Effects On Electrochemical Performance

The role of the interface is particularly important for two-phase compounds and heterogeneous compounds.In many cases,due to the interaction between the interfaces,composites will exhibit better physical and chemical property,compare with single components.It has become an important task for catalyst preparation to design the structure of heterogeneous interface rationally and control it precisely.In this thesis,one-dimensional self-ordered molybdenum oxides were prepared by electrochemical anodization method.Through surface precious metal modification and non-precious metal doping,a variety of molybdenum-based heterogeneous interfaces were constructed to regulate the electrochemical performance of composites.The main research contents are as follows:A one-dimensional molybdenum oxide?nitride?/Pt nanoporous heterointerface was constructed by electrochemical anodization method and electrodeposition techniques.The effects of the number of pulse electrodeposition and the number of cyclic voltammetry on the electrochemical properties of the composites were studied.The electrocatalytic hydrogen production kinetics and hydrogen evolution reaction?HER?mechanism of the composites were also discussed.One-dimensional ordered MoO₃/TiO₂ nanopore structure was successfully grown on a Ti-Mo?35mass%?alloy by adjusting the voltage and time of the anodization.Combining the morphologies obtained from scanning electron microscopy?SEM?,the effect of anodization voltage and time on the morphology of porous titanium molybdenum oxides was analyzed.By changing the heat treatment temperatures and comparing with pure TiO₂ and MoO₃,the influence of the heterointerface formation on the electrochemical performance of the composite was discussed.One-dimensional self-ordered MoO₃/TiO₂ nanopores were nitrided and phosphatized.The effects of nitridation temperatures and time on the capacitance and electrocatalytic hydrogen production performance of composites were studied,and the optimal nitridation conditions were determined.In addition,the appropriate phosphating method was confirmed and the effects of phosphating temperature and protective atmosphere on the morphology,element distribution and structure of the composite were discussed.the HRE performance before and after phosphating were investigated to further analyzethe role of MoP/TiO₂ heterointerfaces in composites.