Study on Synthesis and Electrochemical Performance of PMo-PDDA-GO Composite
首发时间:2017-04-01
Abstract:A 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.
keywords: Graphene oxide Polyoxometalate Cycling stability
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PMo-PDDA-GO复合材料的制备及电化学性能的研究
摘要:本文采用两步合成法制备了一系列磷钼酸,PDDA及不同氧化度氧化石墨烯的复合材料。通过原子力显微镜(AFM)、X射线衍射谱(XRD)以及红外光谱(FTIR)对PMo-PDDA-GOx和前驱体PDDA-GOx (x=1, 2, 3 ,4, 5)进行了表征分析。本文图示了PMo-PDDA-GOx复合材料两步自组装的过程。实验结果表明,随着PPGx中GOx氧化度的增加,PPGx的层间距随之增大,电导率快速下降。当氧化度足够高时(x > 3),PDDA完全插入PPGx中的氧化石墨烯的层间。PDDA作为一个连接磷钼酸与氧化石墨烯的媒介,将大量磷钼酸离子固定在氧化石墨烯片层上,使得PPGx复合材料在比电容和循环稳定性方面可以得到大幅度提升。
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No.4723025534661149****
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