Amorphous aluminum-oxide supercapacitors
Amorphous aluminum-oxide supercapacitors
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DOI：
10.1209/0295-5075/123/58004
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发表时间：
2018-09-01
期刊：
影响因子：
1.8
通讯作者：
Konno, Kazuya
中科院分区：
文献类型：
--
作者：
Fukuhara, Mikio;Kuroda, Tomoyuki;Konno, Kazuya
非晶态氧化铝超级电容器可以在其黑色、凹凸不平的Al2O3-x表面存储大量电荷，其凸度为21 nm，AlO6团簇，电阻率为16.5G Omega cm。电存储可以通过由量子尺寸效应和O空位处正电荷的偏移效应引起的极其增强的电子捕获来阐明。在这里，超级电容器的特点是具有类似于 2、400m(2)/g 的高表面积和大量双电层的形成，在奈奎斯特图中显示出一条垂直线，对应于快速增加的虚阻抗和 -90 度的相位角。使用分布式恒定电路，在高度绝缘的非晶铝表面上并联组装纳米尺寸的电容器，从而使伯德图中的频率降低。超级电容器对正电势（类似于+66V）和负电势（类似于-11V）表现出开关效应。因此，我们可以使用可充电干固体超级电容器来代替实际的锂离子。版权所有 (C) EPLA，2018。
An amorphous aluminium-oxide supercapacitor can store a large amount of electric charge on its blackish, uneven Al2O3-x surface, which has a convexity of 21 nm, AlO6 clusters, and a resistivity of 16.5G Omega cm. The electric storage can be elucidated by extremely enhanced electron trapping resulting from both the quantum-size effect and the offset effect of the positive charges at O-vacancy sites. Here, a supercapacitor, characterised by a high surface area of similar to 2, 400m(2)/g and the formation of large numbers of electric double layers, demonstrates a vertical line in the Nyquist diagram, corresponding to rapidly increased imaginary impedance and phase angle of -90 degrees. with decreasing frequency in the Bode diagram using a distributed constant-electric circuit with a parallel assembly of nanometer-sized capacitors on a highly insulating amorphous aluminium surface. The supercapacitor indicates a switching effect for both positive (similar to +66V) and negative (similar to -11V) potentials. Thus, we can apply rechargeable dry solid supercapacitors in place of practical Li ions. Copyright (C) EPLA, 2018.