Preparation Of Conductive Polyimide And Polyphenylene Sulfide Flexible Thin Film Electrodes And The Nano MoTe₂,Cu₂O For Hydrogen Evolution On Electrodes

Conductive polyimide and polyphenylene sulfide composite materials exhibit good corrosion resistance,flexibility,and the wide temperature stability interval.So these materials are attracting more and more attention in new modified electrode study.In this master thesis,Mo powder doped reduced graphene oxide/polyimide conductive film?RGO/PI/Mo?and carbon nanotube,reduced graphene oxide collaborative doped polyphenylene sulfide?RGO-CNT/RGO/PPS?have been employed as the substrate electrodes,and then the MoTe₂ and Cu₂O were modified on electrodes by electrodeposition methods.The composition,morphology and structure of the modified electrodes were studied by X-ray diffraction?XRD?,scanning electron microscope?SEM?,transmission electron microscopy?TEM?.The electrocatalytic activities of modified electrodes were analyzed by cyclic voltammeter?CV?,linear sweep voltammetry?LSV?and open circuit potential^time?OCP^t?and so on.The main contents include:1.Electrodeposition of MoTe₂ nanodendrites on the RGO/PI/Mo film and theinvestigation of its photoelectrocatalytic hydrogen evolution in neutral solution.In 5 mM Na₂MoO₄+1.5 mM TeO₂?H⁺?+0.2 M PBS?pH=6?solution at-0.7 V?vs.SCE?deposition potential,semi-conductive MoTe₂ nanodendrites are deposited on RGO/PI/Mo composite substrate by i-t electrochemical deposition method,thus the MoTe₂-RGO/PI/Mo modified electrode have been prepared.The photoelectrocatalytic activities of MoTe₂-RGO/PI/Mo in neutral solution has been studied.Under illumination condition,it exhibits a greater current density at more positive potential.MoTe₂ nanodendrites have excellent photo-responsive property,and the potential difference could reach 100 mV.Raman spectroscopy reveals that prepared MoTe₂belongs to 1T'crystalline phase.Compared to other non-noble-metal catalysts,MoTe₂-RGO/PI/Mo modified electrode has a greater performance for HER in neutral solution.2.Preparation of Cu₂O-RGO-CNT/RGO/PPS modified electrode and the electrocatalytichydrogen evolution study.Through complex heat treatment,double modified graphene and electrochemical reduction methods,the base electrode material RGO-CNT/RGO/PPS has been prepared.In 0.15 M Na₂SO₄+50 mM CuSO₄ solution at-0.3 V?vs.SCE?potential,Truncated octahedral and cuboctahedral Cu₂O nanocrystals are synthesized on RGO-CNT/RGO/PPS composite substrate by i-t electrochemical deposition method.The experiment found that the second modified RGO on RGO-CNT/RGO/PPS film can facilitate the formation of Cu₂O morphology.The Cu₂O-RGO-CNT/RGO/PPS composite film shows a superior ability for the hydrogen evolution reaction?HER?compared with other Cu₂O electrocatalysts.With a smaller loading less than 0.04mg cm^-2 on the composite film,its onset potential is merely 0.05 V?vs.RHE?.