Fabrication,Electrochemical And Electrochromic Study Of Multilayer Films Based On Preyssler-Type Polyoxometalates

In this paper,the multilayer films based on the Preyssler-type polyoxometalates was fabricated.The first of all,we use the [NaP₅W₃₀O₁₁₀]14-(noted as {P₅W₃₀})or [KS₅W₃₀O₁₁₀]^9-(noted as {S₅W₃₀})?oxide graphene and the cationic polyethyleneimine to construct the multilayer films via layer-by-layer?LBL?self-assembly technique.Secondly,the modified GC with films was further treated by electrochemical deposition.The multilayer film was characterized reliably by UV-vis spectroscopy,scanning electron microscopy?SEM?,transmission electro microscopy?TEM?and X-ray photoelectron spectroscopy?XPS?.The cyclic voltammetry?CV?and the linear sweep voltammetry?LSV?measurement shows the multilayer film with further treat has good performance for hydrogen evolution reaction?HER?in 0.5 M H₂SO₄ electrolyte.In addition,the probable electrochromic activity and the reducation for H₂O₂ of the(PEI-P₅W₃₀-GO)n and(PEI-S₅W₃₀-GO)n multilayer films were studied via cyclic voltammetry?CV?and chronoamperometry measurement.