PMo-PDDA-GO复合材料的制备及电化学性能的研究

series of composites containing polyoxometalate (PMo), poly (diallyldimethylammonium chloride) (PDDA), and graphene oxide (GO) with different oxidation degrees were prepared in a two-step self-assembly process. The resulting polyoxometalate-poly (diallyldimethylammonium chloride)-graphene oxide (PPGx, x = 1 to 5) composites and their precursors (PDDA-GOx, x = 1 to 5) were analyzed with AFM, XRD, and FTIR spectroscopy. The self-assembly process was schematically summarized. The interspace distance between GO sheets in PPGx increased when the oxidation degree of GO increased. This increase in interspace distance was accompanied by a rapid decrease in the electrical conductivity of PPGx. At a sufficient high oxidation degree (x > 3), PDDA was completely inserted into the interspace of the laminated structure of the GO sheets in PPGx. The experimental results indicated that PDDA acted as a bridge, increasing electrostatic interaction between PMo anions and the GO sheets and causing many PMo anions to become anchored on the GO sheets. The electrochemical performances of the PPGx composites were greatly enhanced by the immobilization of PMo anions on GO sheets via PDDA, resulting in a much larger specific capacitance and a remarkably enhanced cycling stabilityIn this paper.