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.