新型石墨烯基微型超級(jí)電容器的制備及性能研究
發(fā)布時(shí)間：2018-07-16 23:41
【摘要】：集成電子產(chǎn)品的快速發(fā)展增加了小型化和芯片儲(chǔ)能單元的需求,電子工業(yè)向著微型、便攜式、柔性和高度集成的電子產(chǎn)品方向發(fā)展。目前薄膜電池或微電池已經(jīng)應(yīng)用在商用小型設(shè)備中,但它們的使用壽命短、結(jié)構(gòu)復(fù)雜、難以集成。而超級(jí)電容器可克服這些缺點(diǎn),尤其是將正負(fù)極設(shè)計(jì)在同一個(gè)平面上的微型超級(jí)電容器易于制備并集成到芯片電子產(chǎn)品中。石墨烯具有特殊的結(jié)構(gòu)和優(yōu)異的性質(zhì),理論比電容高,是一種極具發(fā)展?jié)撃艿碾姌O材料。石墨烯基微型超級(jí)電容器電極的制備方法有很多,本文主要對(duì)激光雕刻、絲網(wǎng)印刷和噴墨打印這三種方法進(jìn)行研究。本論文的研究?jī)?nèi)容具體為:1、石墨烯基微型超級(jí)電容器的激光雕刻技術(shù)制備。利用改進(jìn)的Hummers法制備的氧化石墨烯為原料,稀釋到3.7 mg/mL,滴涂到PET上室溫干燥制成氧化石墨烯薄膜。再將其貼在光雕光盤(pán)上,放入光雕驅(qū)動(dòng)器按照電腦設(shè)計(jì)的叉指電極的圖案進(jìn)行雕刻。通過(guò)相應(yīng)的測(cè)試研究了氧化石墨烯的沉積量和雕刻次數(shù)對(duì)樣品的形貌和結(jié)構(gòu)的影響。雕刻次數(shù)一定,沉積量為0.38 mg/cm~2時(shí)激光雕刻石墨烯微型超級(jí)電容器的比電容最高(0.885 mF/cm~2);沉積量為0.38 mg/cm~2,雕刻次數(shù)為20次時(shí),沉積在PET上的氧化石墨烯還原程度較高,比電容可達(dá)到2.9mF/cm~2。2、石墨烯基微型超級(jí)電容器的絲網(wǎng)印刷技術(shù)制備。將購(gòu)買(mǎi)的多層石墨烯與粘結(jié)劑按照一定的配比混合制備漿料,絲網(wǎng)印刷制備電極。通過(guò)顯微鏡、SEM觀察到印刷效果較好。同時(shí)用自制的氧化石墨烯制備漿料進(jìn)行印刷,再通過(guò)水合肼、氫碘酸和紅外燈將電極還原,通過(guò)相應(yīng)的表征發(fā)現(xiàn)采用水合肼還原的電極的電容性能最好,為4.9 mF/cm~2。3、石墨烯基微型超級(jí)電容器的噴墨打印技術(shù)制備。通過(guò)制備不同濃度的氧化石墨烯分散液并測(cè)定其粘度和表面張力,確定最佳濃度為6 mg/mL。為了高效降低氧化石墨烯的表面張力,采用全氟表面活性劑(FS-30)進(jìn)行調(diào)節(jié)。將6 mg/mL氧化石墨烯與適量FS-30混合配制成濃度不同的墨水,最終制備了可通過(guò)萬(wàn)能打印機(jī)進(jìn)行打印的墨水即6 mg/mL的氧化石墨烯和2.5 mg/mL的FS-30。先用萬(wàn)能打印機(jī)按照電腦設(shè)計(jì)好的叉指電極打印20次,再通過(guò)水合肼進(jìn)行還原,測(cè)得比電容為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).
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM53
本文編號(hào)：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).
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM53
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