Preparation Of Molybdenum-Based Nanomaterials For Electrochemical Applications

Molybdenum（Mo）based nanomaterials possesses attracting attention in the fields of electrocatalysis,electrochemical sensing and energy storage due to their unique electrochemical properties.In this thesis,two classes of molybdenum-based nanoparticles were synthesized by in-situ initiation of pyrrole polymerization confined by molybdenum ions,and the application of different nano-composites in electrochemical sensing and electrocatalytic acid oxygen evolution was studied.The main contents are as follows:（1）The first chapter developed an in-situ polymerization confined Mo precursor strategy,which can be used for the synthesis of nitrogen doped carbon loading monodisperse ultrasmall molybdenum telluride nanoparticles（MoTe₂/NC）.The application in the electrochemical detection of dopamine（DA）has been explored.The obtained MoTe₂/NC exhibits abundant active sites and good catalytic activity,which has the characteristics of wide detection range,low detection limit and high sensitivity for DA detection.At the same time,it has high selectivity and stability.Therefore,ultra-small MoTe₂ NPs have the potential to be used as dopamine biosensors.（2）Based on the above synthesis strategy,three metal ions,Ru,Mo and Ni,were introduced in the preparation process,the limited growth of Ru,Mo and Ni metal oxides results in the formation of ultra-small molybdenum nickel co-doped Ru O₂ nanoparticles on the nitrogen doped carbon（Mo Ni-Ru O₂/NC）.The as-prepared Mo Ni-Ru O₂/NC exhibited electrocatalytic acid oxygen evolution with an overpotential of 217 m V at current density of 10 m A cm^-2 and the Tafel slope was 47 m V dec^-1.This thesis puts forward the in-situ confining polymerization precursor for the synthesis of a series of molybdenum nanomaterials.Therefore,it provides important theoretical and application value for the investigation and discussion of Mo-based nanoparticles in detection and catalysis.