新型石墨烯基微型超级电容器的制备及性能研究
发布时间：2018-07-16 23:41
【摘要】：集成电子产品的快速发展增加了小型化和芯片储能单元的需求,电子工业向着微型、便携式、柔性和高度集成的电子产品方向发展。目前薄膜电池或微电池已经应用在商用小型设备中,但它们的使用寿命短、结构复杂、难以集成。而超级电容器可克服这些缺点,尤其是将正负极设计在同一个平面上的微型超级电容器易于制备并集成到芯片电子产品中。石墨烯具有特殊的结构和优异的性质,理论比电容高,是一种极具发展潜能的电极材料。石墨烯基微型超级电容器电极的制备方法有很多,本文主要对激光雕刻、丝网印刷和喷墨打印这三种方法进行研究。本论文的研究内容具体为:1、石墨烯基微型超级电容器的激光雕刻技术制备。利用改进的Hummers法制备的氧化石墨烯为原料,稀释到3.7 mg/mL,滴涂到PET上室温干燥制成氧化石墨烯薄膜。再将其贴在光雕光盘上,放入光雕驱动器按照电脑设计的叉指电极的图案进行雕刻。通过相应的测试研究了氧化石墨烯的沉积量和雕刻次数对样品的形貌和结构的影响。雕刻次数一定,沉积量为0.38 mg/cm~2时激光雕刻石墨烯微型超级电容器的比电容最高(0.885 mF/cm~2);沉积量为0.38 mg/cm~2,雕刻次数为20次时,沉积在PET上的氧化石墨烯还原程度较高,比电容可达到2.9mF/cm~2。2、石墨烯基微型超级电容器的丝网印刷技术制备。将购买的多层石墨烯与粘结剂按照一定的配比混合制备浆料,丝网印刷制备电极。通过显微镜、SEM观察到印刷效果较好。同时用自制的氧化石墨烯制备浆料进行印刷,再通过水合肼、氢碘酸和红外灯将电极还原,通过相应的表征发现采用水合肼还原的电极的电容性能最好,为4.9 mF/cm~2。3、石墨烯基微型超级电容器的喷墨打印技术制备。通过制备不同浓度的氧化石墨烯分散液并测定其粘度和表面张力,确定最佳浓度为6 mg/mL。为了高效降低氧化石墨烯的表面张力,采用全氟表面活性剂(FS-30)进行调节。将6 mg/mL氧化石墨烯与适量FS-30混合配制成浓度不同的墨水,最终制备了可通过万能打印机进行打印的墨水即6 mg/mL的氧化石墨烯和2.5 mg/mL的FS-30。先用万能打印机按照电脑设计好的叉指电极打印20次,再通过水合肼进行还原,测得比电容为1.9 mF/cm~2。
[Abstract]:The rapid development of integrated electronic products has increased the demand for miniaturization and chip energy storage units, and the electronic industry has developed towards micro, portable, flexible and highly integrated electronic products. At present, thin film batteries or microbatteries have been used in commercial small equipment, but their service life is short, the structure is complex, and it is difficult to integrate. Supercapacitors can overcome these disadvantages, especially micro-supercapacitors designed on the same plane are easy to be fabricated and integrated into chip electronic products. Graphene has special structure and excellent properties. It has high theoretical capacitance and is a potential electrode material. There are many preparation methods for graphene based micro supercapacitor electrode. In this paper, laser engraving, screen printing and inkjet printing are studied. In this paper, the laser engraving technology of graphene-based micro supercapacitors is studied. Graphene oxide films were prepared by modified Hummers method and diluted to 3.7 mg / mL and dripped onto PET at room temperature to prepare graphene oxide films. Then stick it on the optical disc and put it into the light engraving drive according to the design of the computer-designed cross-finger electrode. The effect of the amount of graphene oxide deposition and the number of engraving times on the morphology and structure of the samples were investigated. The specific capacitance of the laser engraved graphene micro-supercapacitor was the highest (0.885 MV 路cm ~ 2), and the deposition amount was 0.38 mg / cm ~ 2. When the number of engraving was 20 times, the reduction degree of graphene oxide deposited on PET was higher. The specific capacitance can reach 2.9 MV 路cm ~ (-2). The screen printing technology of graphene based micro supercapacitor is introduced. The multilayer graphene and binder were mixed to prepare the paste and the electrode was prepared by screen printing. The printing effect is better by SEM. At the same time, the slurry prepared from graphene oxide was printed, and the electrode was reduced by hydrazine hydrate, hydroiodic acid and infrared lamp. It was found that the electrode reduced by hydrazine hydrate had the best capacitance performance. For 4.9 MF / cm ~ (3), graphite based micro supercapacitors were prepared by inkjet printing technology. By preparing graphene oxide dispersions of different concentrations and measuring their viscosity and surface tension, the optimum concentration was determined to be 6 mg / mL. In order to reduce the surface tension of graphene oxide, perfluorocarbon surfactant (FS-30) was used to regulate the surface tension of graphene oxide. The ink of different concentration was prepared by mixing 6 mg / mL graphene oxide with proper amount of FS-30. The ink that could be printed by universal printer was 6 mg / mL graphene oxide and 2.5 mg / mL FS-30. The universal printer was printed 20 times according to the interDigital electrode designed by computer and then reduced by hydrazine hydrate. The measured specific capacitance was 1.9 mF / cm ~ (2).
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM53
本文编号：2128076
[Abstract]:The rapid development of integrated electronic products has increased the demand for miniaturization and chip energy storage units, and the electronic industry has developed towards micro, portable, flexible and highly integrated electronic products. At present, thin film batteries or microbatteries have been used in commercial small equipment, but their service life is short, the structure is complex, and it is difficult to integrate. Supercapacitors can overcome these disadvantages, especially micro-supercapacitors designed on the same plane are easy to be fabricated and integrated into chip electronic products. Graphene has special structure and excellent properties. It has high theoretical capacitance and is a potential electrode material. There are many preparation methods for graphene based micro supercapacitor electrode. In this paper, laser engraving, screen printing and inkjet printing are studied. In this paper, the laser engraving technology of graphene-based micro supercapacitors is studied. Graphene oxide films were prepared by modified Hummers method and diluted to 3.7 mg / mL and dripped onto PET at room temperature to prepare graphene oxide films. Then stick it on the optical disc and put it into the light engraving drive according to the design of the computer-designed cross-finger electrode. The effect of the amount of graphene oxide deposition and the number of engraving times on the morphology and structure of the samples were investigated. The specific capacitance of the laser engraved graphene micro-supercapacitor was the highest (0.885 MV 路cm ~ 2), and the deposition amount was 0.38 mg / cm ~ 2. When the number of engraving was 20 times, the reduction degree of graphene oxide deposited on PET was higher. The specific capacitance can reach 2.9 MV 路cm ~ (-2). The screen printing technology of graphene based micro supercapacitor is introduced. The multilayer graphene and binder were mixed to prepare the paste and the electrode was prepared by screen printing. The printing effect is better by SEM. At the same time, the slurry prepared from graphene oxide was printed, and the electrode was reduced by hydrazine hydrate, hydroiodic acid and infrared lamp. It was found that the electrode reduced by hydrazine hydrate had the best capacitance performance. For 4.9 MF / cm ~ (3), graphite based micro supercapacitors were prepared by inkjet printing technology. By preparing graphene oxide dispersions of different concentrations and measuring their viscosity and surface tension, the optimum concentration was determined to be 6 mg / mL. In order to reduce the surface tension of graphene oxide, perfluorocarbon surfactant (FS-30) was used to regulate the surface tension of graphene oxide. The ink of different concentration was prepared by mixing 6 mg / mL graphene oxide with proper amount of FS-30. The ink that could be printed by universal printer was 6 mg / mL graphene oxide and 2.5 mg / mL FS-30. The universal printer was printed 20 times according to the interDigital electrode designed by computer and then reduced by hydrazine hydrate. The measured specific capacitance was 1.9 mF / cm ~ (2).
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM53
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