Interfacial polymerized polyaniline/graphite oxide nanocomposites toward electrochemical energy storage
Interfacial polymerized polyaniline/graphite oxide nanocomposites toward electrochemical energy storage
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DOI：
10.1016/j.polymer.2012.10.002
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发表时间：
2012-11
期刊：
影响因子：
4.6
通讯作者：
Jiahua Zhu;Minjiao Chen;Honglin Qu;Xi Zhang;Huige Wei;Zhiping Luo;H. Colorado;Suying Wei;Zhanhu Guo
中科院分区：
文献类型：
--
作者：
Jiahua Zhu;Minjiao Chen;Honglin Qu;Xi Zhang;Huige Wei;Zhiping Luo;H. Colorado;Suying Wei;Zhanhu Guo
采用界面聚合法制备了具有良好界面相互作用和细长纤维结构的聚苯胺纳米纤维（PANI-NFs）/氧化石墨（GO）纳米复合材料。该聚合方法有效地将GO的膨胀层结构剥离成单独的片，从而显著提高了比表面积。从TEM结果观察到PANI-NF和GO之间强相互作用的直接证据。PANI-NF/GO中PANI-NF的直径比纯PANI-NF的直径减小，可以缩短扩散距离并增强电活性位点。PANI-NF/GO杂化材料的电容和能量密度比单个GO和PANI-NF组分的电容和能量密度提高了几个数量级。复合材料中较高的PANI-NF级分在80 W/kg的功率密度下产生7.1 W h/kg的能量密度。PANI-NFs/GO纳米复合材料的电化学电容增大归因于比表面积的增加，从而提高了电极离子对电活性材料的可及性，以及由于良好的界面相互作用而提高的导电性。采用表面引发聚合法制备了聚苯胺纳米复合材料。在相同的PANI负载量下，纤维状PANI比颗粒状PANI在更高的功率密度下表现出更高的能量密度和长期稳定性。
Polyaniline nanofibers (PANI-NFs)/graphite oxide (GO) nanocomposites with excellent interfacial interaction and elongated fiber structure were synthesized via a facile interfacial polymerization method. This polymerization method efficiently exfoliated the expanded layer structure of GO into individual sheets and thus significantly enhanced the specific surface area. Direct evidence of a strong interaction between PANI-NFs and GO was observed from TEM results. The reduced diameter of PANI-NFs in PANI-NF/GO than that of pure PANI-NFs could shorten the diffusion distance and enhance the electro-active sites. The PANI-NFs/GO hybrid materials showed orders of magnitude enhancement in capacitance and energy density than that of individual GO and PANI-NF components. The higher PANI-NFs fraction in composites generated an energy density of 7.1 W h/kg at a power density of 80 W/kg. The enlarged electrochemical capacitance of the PANI-NFs/GO nanocomposites was attributed to the increased specific surface area, which improved the accessibility of ions from electrodes to electroactive materials as well as the improved conductivity due to the excellent interfacial interaction. PANI nanoparticles were observed in the nanocomposites when surface initiated polymerization method was used to prepare the polymer nanocomposites. At the same weight loading of PANI in the composites, fibrous PANI demonstrated higher energy density and long term stability than that of particle-shaped PANI at higher power density.