Preparation Of NiSe And CoP Modified Conductive Polymer Electrode For Electrocatalytic Hydrogen Evolution Research

The development of carbon nanomaterials doped conductive polymer electrodes is of great scientific significance and potential application in sustainable energy-based materials owing to their excellent surface activity,high flexibility,good resistances to strong acidic and basic solutions,high stability and so on.In this dissertation,the graphene/carbonnanotube/polymide（RGO/CNT/PI）andgraphene/carbon nanotube/polyphenylene sulfide/graphene（RGO/CNT/PPS/RGO）conductive polymer films have been prepared and employed as two novel electrodes to substitute traditionally electrodes.NiSe and CoP nanoparticles have been modified on the surface of RGO/CNT/PI and RGO/CNT/PPS/RGO electrodes by electrodeposition method,respectively.The structure and morphology of nanomaterials modified electrodes have been investigated by scanning electron microscope（SEM）,transmission electron microscopy（TEM）,X-ray powder diffraction（XRD）and X-ray photoelectron spectroscopy（XPS）.The electrocatalytic performances towards the hydrogen evolution reaction（HER）have been investigated by cyclic voltammetry（CV）,current-time curve（i-t）and linear sweep voltammetry（LSV）.The detailed dissertation is as follows:1.Preparation of NiSe decorated RGO/CNT/PI film for electrocatalytic HER in acidic solution.The surface of CNT/PI electrode has been modified by RGO using electrochemical reduction of graphene oxide,obtaining RGO/CNT/PI electrode that exhibites an enhanced electrical conductivity.NiSe nanoparticles decorated RGO/CNT/PI（NiSe-RGO/CNT/PI）electrode has been prepared by i-t method operated at a deposition potential of-0.50 V vs.SCE in a solution of 0.1 M Na₂SO₄,5.0 mM NiSO₄ and 10.0 mM SeO₂ aqueous solution.LSV has been used to investigate the HER electrocatalytic behaviors of NiSe-RGO/CNT/PI electrode in 0.5M H₂SO₄ solution.Electrochemical measurements have demonstrated RGO improves the electrochemical active surface area and electrocatalytic activities of NiSe-RGO/CNT/PI electrode.The tafel slpoe of NiSe-RGO/CNT/PI electrode is 61mV/dec,suggesting the mechanism of this HER is Volmer-Heyrovsky mechanism.2.In situ electrodeposition CoP on the surface of RGO/CNT/PPS/RGO electrode for electrocatalytic HER in all-pH condition.The CNT and RGO have been added in PPS to construct the CNT/PPS/RGO electrode.The RGO/CNT/PPS/RGO electrode has been prepared by i-t method.The in-situ electrochemical deposition has been proposed to obtain CoP nanoparticles modified RGO/CNT/PPS/RGO（CoP-RGO/CNT/PPS/RGO）electrode by CV in a precursor solution consisted of 10 mM CoSO₄,100 mM NaH₂PO₂ and 0.2 M HAc-NaAc（pH=3.6）at a potential window between 0.1 and-1.05 V vs.SCE at a scan rate of 10 mV s^-1.The electrocatalytic performance of the CoP-RGO/CNT/PPS/RGO electrode has been measured by LSV in different-pH electrolytes（0.5 M H₂SO₄,1 M PBS and 1M KOH）,revealing that CoP-RGO/CNT/PPS/RGO electrode exhibits good electrocatalytic performances towards HER in all pH values.