电容器
材料科学
纳米孔
离子
电容感应
电解质
电化学
锂(药物)
电极
纳米技术
纳米孔
图层(电子)
超级电容器
光电子学
计算机科学
化学
电压
物理
物理化学
医学
内分泌学
操作系统
有机化学
量子力学
作者
Andrew J. Ilott,Nicole M. Trease,Clare P. Grey,Alexej Jerschow
摘要
The last decade has seen an intensified interest in the development and use of electrochemical double-layer capacitors, fuelled by the availability of new electrode materials. The use of nanoporous carbons, in particular, with extremely high surface areas for ion adsorption has enabled the development of working devices with significantly increased capacitances that have become viable alternatives to lithium-ion batteries in certain applications. An understanding of the charge storage mechanism and the ion dynamics inside the nanopores is only just emerging, with the most compelling evidence coming from simulation. Here we present the first in situ magnetic resonance imaging experiments of electrochemical double-layer capacitors. These experiments overcome the limitations of other techniques and give spatially resolved chemical information about the electrolyte ions in real time for a working capacitor of standard geometry. The results provide insight into the predominant capacitive processes occurring at different states of charge and discharge. Electric double-layer capacitors are promising energy storage devices with high-power density. Here, the authors report in situmagnetic resonance imaging experiments on a working electric double-layer capacitor, revealing insights into the charge storage mechanism and cell-aging effects.
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