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最小的大容量电容器--Evans混合电容器 总被引:2,自引:0,他引:2
介绍了一种由钽阳极、Ta2O5介质、液体电解质和RuO2阴极组成的高能量密度电容器——Evans混合电容器 (Evans Hybrid capacitors)。它具有与电化学电容器相当的能量密度和比电解电容器更完善的交流特性。单元工作电压达215 V。目前已实现了用改进封装技术将若干个该类电容器并联封装在同一外壳内。给出了50 V,18 mF混合电容的性能数据。 相似文献
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Yuanzhe Li Naixiang Wang Anneng Yang Haifeng Ling Feng Yan 《Advanced Electronic Materials》2019,5(10)
Stretchable organic electrochemical transistors (OECTs) can find applications in wearable electronics for biosensing. However, the existing fabrication methods are either inconvenient or expensive. Here, a novel method to fabricate stretchable OECTs based on biomimicking polydimethylsiloxane substrates is reported. The substrate pattern is transferred from the bract of Bougainvillea glabra, demonstrating a 2D wavy structure. To further enhance the stretchability of the Au electrodes of the devices on the wavy surface, a highly conductive polymer film is coated on the Au surface by inkjet printing to bridge disconnected parts separated by cracks. The obtained OECTs demonstrate omnidirectional stretchability up to 30% and a bending radius down to 15 mm with stable performance. Stretchable glucose sensors with a detection limit around 1 µm are developed based on the biomimicking stretchable OECTs, which are sensitive enough for detecting glucose levels in body fluids. 相似文献
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用导电聚合物电极的超电容器研究概况 总被引:6,自引:2,他引:4
导电聚合物制备电极的超电容器(Supercapacitors) 有两种类型: 导电聚合物直接制备电极和导电聚合物高温热解为硬碳(Hard carbon)制备电极的电容器。导电聚合物超电容器基于法拉第准电容(Faradaicpseu-docapacitance) 原理, 进出正极的是阴离子, 进出负极的是阳离子。该电容器结构中一个电极是n 型掺杂, 另一个是p 型掺杂。聚合物超电容器的能量密度比活性碳作电极的双电层电容器大2~3倍, 作为电容性储能装置应用前景诱人 相似文献
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Fang Zhang Changzhou Yuan Jiajia Zhu Jie Wang Xiaogang Zhang Xiong Wen Lou 《Advanced functional materials》2013,23(31):3944-3944
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Fang Zhang Changzhou Yuan Jiajia Zhu Jie Wang Xiaogang Zhang Xiong Wen Lou 《Advanced functional materials》2013,23(31):3909-3915
Flexible porous films are prepared from electrospun carbon nanofibers (CNFs) embedded with Co3O4 hollow nanoparticles (NPs) and are directly applied as self‐supported electrodes for high‐performance electrochemical capacitors. Uniform Co3O4 hollow NPs are well dispersed and/or embedded into each CNF with desirable electrical conductivity. These Co3O4‐CNFs intercross each other and form 3D hierarchical porous hybrid films. Benefiting from intriguing structural features, the unique binder‐free Co3O4 hollow NPs/CNF hybrid film electrodes exhibit high specific capacitance (SC), excellent rate capability and cycling stability. As an example, the flexible hybrid film with loading of 35.9 wt% Co3O4 delivers a SC of 556 F g?1 at a current density of 1 A g?1, and 403 F g?1 even at a very high current density of 12 A g?1. Remarkably, almost no decay in SC is found after continuous charge/discharge cycling for 2000 cycles at 4 A g?1. This exceptional electrochemical performance makes such novel self‐supported Co3O4‐CNFs hybrid films attractive for high‐performance electrochemical capacitors. 相似文献
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Reshma R. Rao Michał Tułodziecki Binghong Han Marcel Risch Artem Abakumov Yang Yu Pinar Karayaylali Magali Gauthier María Escudero-Escribano Yuki Orikasa Yang Shao-Horn 《Advanced functional materials》2021,31(2):2002249
The reactivity of water with Li-rich layered Li2RuO3 and partial exchange of Li2O with H2O within the structure is studied under aqueous (electro)chemical conditions. Upon slow delithiation in water over long time periods, micron-sized Li2RuO3 particles structurally transform from an O3 structure to an O1 structure with a corresponding loss of 1.25 Li ions per formula unit. The O1 stacking of the honeycomb Ru layers is imaged using high-resolution high-angle annular dark-field scanning transmission electron microscopy, and the resulting structure is solved by X-ray powder diffraction and electron diffraction. In situ X-ray absorption spectroscopy suggests that reversible oxidation/reduction of bulk Ru sites is realized on potential cycling between 0.4 and 1.25 VRHE in basic solutions. In addition to surface redox pseudocapacitance, the partially delithiated phase of Li2RuO3 shows high capacity, which can be attributed to bulk Ru redox in the structure. This work demonstrates that the interaction of aqueous electrolytes with Li-rich layered oxides can result in the formation of new phases with (electro)chemical properties that are distinct from the parent material. This understanding is important for the design of aqueous batteries, electrochemical capacitors, and chemically stable cathode materials for Li-ion batteries. 相似文献
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应用纳米微晶TiO2为原料,通过高温固相反应合成了具有尖晶石结构的锂钛复合氧化物Li4Ti5O12,该材料的首次嵌脱锂效率可达91.9%,10 mA/g电流密度下的可逆嵌锂容量为102 mAh/g。将其制成嵌锂电极后与活性炭电极构成新型的Li4Ti5O12/AC非对称电容体系。测试结果表明:在80 mA/g条件下,其双电极比电容为41.6 F/g,能量密度为采用相同电解液体系的AC/AC双电层电容的4.6倍,充放电效率达95.8%,且大电流性能及循环性能良好。 相似文献
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