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以氧化石墨为载体,采用木质素磺酸钠作为掺杂剂,氯化铁作为氧化剂,引发吡咯单体在氧化石墨层发生化学原位聚合反应,制备了聚吡咯(PPy)/氧化石墨复合材料。通过XRD、FTIR和SEM分析分别对复合材料的物相组成、结构和微观形貌进行了表征,通过TGA分析研究了复合材料的热稳定性,采用恒电流充放电、循环伏安和电化学阻抗谱等方法测试分析其电化学性能。研究表明:采用化学原位聚合的方法合成的PPy/氧化石墨复合材料具有“层-球”状的“三明治”型微观结构,以便形成良好的导电网络,其结晶度高、排列规整、缺陷少,复合材料中吡咯单体通过N—H键与氧化石墨的含氧官能团发生键合。PPy/氧化石墨复合材料新颖的微观结构和良好的化学键合状态使其表现出优异的电容性能。在电流密度分别为0.5、1.0、2.0和5.0A/g时的比电容分别为500、460、427和396F/g;经过1 000次恒电流(2.0A/g)充放电循环后,PPy/氧化石墨复合材料的比电容保持率为97.2%。
Using graphite oxide as carrier, sodium lignosulfonate as dopant and ferric chloride as oxidant, pyrrole monomer was initiated into chemical in situ polymerization in graphite oxide layer to prepare polypyrrole (PPy) / graphite oxide composite . The phase composition, microstructure and morphology of the composites were characterized by XRD, FTIR and SEM. The thermal stability of the composites was investigated by TGA analysis. The galvanostatic charge-discharge, cyclic voltammetry and electrochemical impedance Spectrum and other methods to test its electrochemical properties. The results show that the PPy / graphite oxide composites synthesized by chemical in situ polymerization have a “layer-ball ” “sandwich ” type microstructure to form a good conductive network with high crystallinity and alignment Regular, less defects, the pyrrole monomer in the composite through the N-H bond with the oxygenated functional groups of graphite oxide bonded. The novel microstructure and good chemical bonding of PPy / graphite oxide composites make them exhibit excellent capacitance performance. The specific capacitances were 500, 460, 427 and 396 F / g at the current densities of 0.5, 1.0, 2.0 and 5.0 A / g, respectively. After 1000 cycles of constant current (2.0 A / g) The specific capacitance retention of graphite oxide composites was 97.2%.