共查询到20条相似文献,搜索用时 202 毫秒
1.
《中国无线电电子学文摘》2005,(1)
TN6,TM53 2005010556超级离子龟容器C/Nio复合气凝胶电极材料的研究/徐榕青,李悦.陈艾,昊孟弧,陆海鹏(西南电子设备研究所)仆电子学报一2004,32(8)一1399一1401以间苯二酚‘甲醛、硝酸镍和无水碳酸钠为原料,使用溶胶一凝胶法制备碳/氧化镍复合凝胶,经CO:超临界干燥及900℃炭化处理,得到复合碳气凝胶,电化学方法证明这种材料制备的电极具有典型的电容特性.采用1 mol/L KOH电解液构成电容器单元,比电容量达263F/g,等效串联电阻小于1几.文中还对这种复合材料的结构形貌进行了探讨.分析了其对电容器性能的影响.图7参5(李)连理工大学)11电… 相似文献
2.
3.
田帆飞张果丽贾晓霞李刚王开鹰 《微纳电子技术》2023,(9):1376-1385
通过选择性溶解法制备了多孔结构的聚乙烯醇(PVA)基大分子羧甲基纤维素(CMC)复合凝胶电解质,以此提高凝胶电解质的离子电导率和柔性超级电容器的电化学性能。使用扫描电子显微镜(SEM)对凝胶电解质的形貌进行了表征。凝胶内部为多孔的网络结构,不规则的孔均匀分布在PVA基体中。同时,采用活性炭作为电极组装成柔性超级电容器。对凝胶电解质的离子电导率、吸水率和热稳定性进行了测试,实验结果表明多孔PVA-10%CMC复合凝胶电解质离子电导率最高可达64.3 mS/cm,具有130.3%的吸水率和63.8%的保水率,并且在-10、25和40℃温度梯度下可以稳定使用。此外,利用其组装的柔性超级电容器的比电容最高可达40.0 F/g,循环10 000圈后的比电容保持率为55%,并且有优异的倍率性能和弯曲性能。因此,多孔结构的构建和CMC的复合是提高凝胶电解质性能的有效方法。 相似文献
4.
5.
6.
新型材料MXene(过渡金属二维碳化物,氮化物和碳氮化物)由于其良好的电化学活性而被广泛应用于储能材料。聚吡咯因其具有稳定的导电性而常用作超级电容器材料。通过原位聚合法成功制备MXene(Ti_3C_2T_x)和聚吡咯(PPy)复合材料。利用扫描电镜(SEM)和X射线衍射仪(XRD)对Ti_3C_2T_x/PPy复合电极材料进行表征,结果表明PPy均匀地包覆在Ti_3C_2T_x表面。这种独特的复合材料展现良好的协同作用,有效提高了电子和离子的传输速率。电化学测试表明:Ti_3C_2T_x和聚吡咯质量比为2∶1时复合材料表现出最好的电化学性能,当电流密度为1 A·g~(-1)时,Ti_3C_2T_x/PPy-2的比电容达到139 F·g~(-1),并且拥有较好的倍率性能。结果表明Ti_3C_2T_x/PPy复合材料可用于制备超级电容器电极材料。 相似文献
7.
8.
9.
10.
11.
Marko J. Tadjer Michael A. Mastro José M. Rojo Alberto Boscá Mojena Fernando Calle Francis J. Kub Charles R. Eddy Jr. 《Journal of Electronic Materials》2014,43(4):1188-1193
Manganese dioxide films were grown on large area flexible carbon aerogel substrates. Characterization by x-ray diffraction confirmed α-MnO2 growth. Three types of films were compared as a function of hexamethylenetetramine (HMTA) concentration during growth. The highest concentration of HM TA produced MnO2 flower-like films, as observed by scanning electron microscopy, whose thickness and surface coverage lead to both a higher specific capacitance and higher series resistance. Specific capacitance was measured to be 64 F/g using a galvanostatic setup, compared to the 47 F/g-specific capacitance of the carbon aerogel substrate. Such supercapacitor devices can be fabricated on large area sheets of carbon aerogel to achieve high total capacitance. 相似文献
12.
Jingxin Zhao Yan Zhang Xiaoxin Zhao Rutao Wang Jixun Xie Chengfeng Yang Juanjuan Wang Qichong Zhang Lele Li Conghua Lu Yagang Yao 《Advanced functional materials》2019,29(26)
3D printing graphene aerogel with periodic microlattices has great prospects for various practical applications due to their low density, large surface area, high porosity, excellent electrical conductivity, good elasticity, and designed lattice structures. However, the low specific capacitance limits their development in energy storage fields due to the stacking of graphene. Therefore, constructing a graphene‐based 2D materials hybridization aerogel that consists of the pseduocapacitive substance and graphene material is necessary for enhancing electrochemical performance. Herein, 3D printing periodic graphene‐based composite hybrid aerogel microlattices (HAMs) are reported via 3D printing direct ink writing technology. The rich porous structure, high electrical conductivity, and highly interconnected networks of the HAMs aid electron and ion transport, further enabling excellent capacitive performance for supercapacitors. An asymmetric supercapacitor device is assembled by two different 4‐mm‐thick electrodes, which can yield high gravimetric specific capacitance (Cg) of 149.71 F g?1 at a current density of 0.5 A g?1 and gravimetric energy density (Eg) of 52.64 Wh kg?1, and retains a capacitance retention of 95.5% after 10 000 cycles. This work provides a general strategy for designing the graphene‐based mixed‐dimensional hybrid architectures, which can be utilized in energy storage fields. 相似文献
13.
14.
15.
有机双电层电容器用活性炭电极的修饰 总被引:5,自引:2,他引:3
利用石墨、炭黑、碳纳米管三种导电碳材料,对高比表面积活性炭进行掺杂修饰,制备有机电解液双电层电容器用薄膜电极。经电化学测试发现,在 1 mol/L 的 LiPF6/EC-DEC(体积比 1∶1)溶液中,经不同导电材料修饰后的活性炭电极,其单电极比容量和大电流充放电性能均有较大改善。其中,掺杂 10%(质量分数)碳纳米管的活性炭电极,在 330 mA/g 电流密度下的单电极比容量可达 81 F/g,比未掺杂活性炭电极 60 F/g 的比容量提高了 35%;电流密度从 60 mA/g 增至 330 mA/g,该电极的容量保持率为 79.4%。 相似文献
16.
17.
Cheng C.H. Pan H.C. Huang C.C. Chou C.P. Hsiao C.N. Hu J. Hwang M. Arikado T. McAlister S.P. Chin A. 《Electron Device Letters, IEEE》2008,29(10):1105-1107
We show that a conventional nitrogen plasma treatment is insufficient to suppress the formation of an interfacial layer at the bottom electrode of TiHfO metal-insulator-metal (MIM) capacitors. However, the capacitance density and leakage current of TaN/TiHfO/TaN MIM capacitors monotonically improve by exposing the lower TaN electrode to an additional oxygen plasma treatment. By performing dual oxygen and nitrogen plasma treatments on the lower electrode, the leakage current was 4.8 times 10-6 A/cm2 (at -1 V) at a 28 fF/ mum2 capacitance density. 相似文献
18.
19.
超电容器活性炭/炭黑复合电极电容特性研究 总被引:3,自引:0,他引:3
为制备实用化的超电容器,对活性炭材料进行了表征,详细描述了活性炭/炭黑复合电极的制备工艺。通过循环伏安法和恒电流充电法,对活性炭/炭黑复合电极在水系电解液中的电容行为进行了研究。结果表明:活性炭的BET比表面积达1 654 m2/g,具有合理的孔径分布,主要在2 nm附近。添加高比表面积、高导电性纳米级炭黑制备的活性炭/炭黑复合电极具有优良的电容行为和较好的功率特性,复合电极的比容量达到102.4 F/g。此外还对孔径分布与电容的关系进行了阐述。 相似文献
20.
Guoge Zhang Wenfang Li Keyu Xie Fei Yu Haitao Huang 《Advanced functional materials》2013,23(29):3675-3681
Research is currently being carried out in the search for alternative electrode materials to replace the expensive and toxic RuO2‐based electrode. As a typical example, nickel oxide or hydroxide has been widely studied but the results are far from satisfactory. Here, using a facile one‐step anodization method, a hierarchical nickel compound (HNC) film with an interconnecting 3D nanoflake structure is obtained, providing large electrochemically active surface area and interconnecting nanoscale pore channels for ion transport. The HNC electrode demonstrates significantly improved capacitance, 70 times higher than the reported NiO‐TiO2 nanotube array electrode with similar thickness. The charge/discharge kinetics are also superior, showing only a 24% capacitance reduction when the scan rate is increased by 50 times, as compared with the typical 70% capacitance reduction for pseudocapacitor electrodes under the same conditions. HNC exhibits an extraordinary excellent cycle life; capacitance increases to 115% after 4500 test cycles. Furthermore, because HNC is in intimate contact with the current collector, it is not necessary to use conducting agents or binders, which reduces the electrode weight and facilitates the electrode preparation process. The method is low cost, facile, scalable, additive free, and is promising for fabricating supercapacitor electrode with excellent performance. 相似文献