石墨烯纳米电容器介质层的高储能效率
Large energy storage efficiency of the dielectric layer of graphene nanocapacitors
摘要：
电容器通常用于电子电路中，用于短期存储少量能量。然而，期望使用电容器来存储大得多的能量以代替可再充电电池。不幸的是，现有的电容器不能存储足够的能量以能够替代普通的电化学能量存储系统。在这里，我们研究了石墨烯纳米电容器的储能能力，石墨烯纳米电容器是涉及Al膜、Al 2 O3介电层和单层碳原子的尝试层，即，石墨烯。这是一个纯电子电容器，因此它可以在很宽的温度区间内工作。该电容器显示出高介电击穿电场强度，约为1000 kV/mm（即，1GV/m），远大于表中Al 2 O3介电强度值。相应的能量密度比普通电解电容器的能量密度大10至100倍。此外，我们发现存储在介电层中的电荷量可以等于或甚至可以超过存储在电容器板上的电荷量。介质放电电流遵循幂律时间依赖性。我们提出了一个模型来解释这种行为。
英文摘要：
Electric capacitors are commonly used in electronic circuits for short-term storage of small amounts of energy. It is desirable however to use capacitors to store much larger energy amounts to replace rechargeable batteries. Unfortunately, the existing capacitors cannot store a sufficient energy to be able to replace common electrochemical energy storage systems. Here we examine energy storage capabilities of graphene nanocapacitors, which are try-layers involving an Al film, Al2O3 dielectric layer, and a single layer of carbon atoms, i.e., graphene. This is a purely electronic capacitor and therefore it can function in a wide temperature interval. The capacitor shows a high dielectric breakdown electric field strength, of the order of 1000 kV/mm (i.e., 1GV/m), which is much larger than the table value of the Al2O3 dielectric strength. The corresponding energy density is 10 to 100 times larger than the energy density of a common electrolytic capacitor. Moreover, we discover that the amount of charge stored in the dielectric layer can be equal or can even exceed the amount of charge stored on the capacitor plates. The dielectric discharge current follows a power-law time dependence. We suggest a model to explain this behavior.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
