| Deep eutectic solvents(DESs)have been considered to be promising green solvents in many application fields due to their advantages such as non-toxic,biodegradable,low cost,high purity,etc.This thesis put emphasis upon preparation of multi-walled carbon nanotubes(MWCNTs)supporting Pt-based composite catalysts in choline chloride/ethylene glycol DESs by chemical reduction method,and the prepared catalysts were used for the methanol oxidation reaction.The subject presents a frontier of multidiscipline covering electro-catalysis,materials science and energy science.The main original results are as follows:(1)With choline chloride/ethylene glycol DESs as medium,the MWCNTs supporting PtCu alloy catalyst(PtCu/MWCNTs-D)was synthesized by solvothermal method.The prepared composites were characterized by using X-ray diffraction(XRD),transmission electron microscopy(TEM)and X-ray photoelectron spectroscopy(XPS).Electrochemical cyclic voltammetry and chronoamperometry tests show that as-prepared PtCu/MWCNTs-D composite exhibits higher electrocatalytic activity and stability for methanol oxidation.(2)The MWCNTs supporting Co nanoparticles were first prepared,and then the MWCNTs supporting PtCo nanoparticles catalyst(PtCo/MWCNTs)was synthesized in choline chloride/ethylene glycol DESs by solvothermal method.The prepared nanocomposites were characterized by using X-ray diffraction(XRD),transmission electron microscopy(TEM)and X-ray photoelectron spectroscopy(XPS).The electrocatalytic properties were tested by cyclic voltammetry and chronoamperometry.The results indicate that the electrocatalytic activity and stability of the PtCo/MWCNTs for methanol oxidation were obviously enhanced.This thesis studied the chemical reduction synthesis of Pt-based catalysts on MWCNTs in DESs and their application in the methanol oxidation reaction,which provides a new way for further improving the performance of DMFC anode catalyst. |
