论文标题
石墨烯纳米球员介电层的大量储能效率
Large energy storage efficiency of the dielectric layer of graphene nanocapacitors
论文作者
论文摘要
电容器通常用于电子电路中，用于短期存储少量能量。但是，希望使用电容器存储更大的能量来替代可充电电池。不幸的是，现有的电容器无法存储足够的能量来替代常见的电化学能源储能系统。在这里，我们检查了石墨烯纳米能力的储能能力，这些储能能力是涉及Al膜，Al2O3介电层和单层碳原子的试层，即石墨烯。这是一个纯粹的电子电容器，因此可以在较宽的温度间隔内起作用。电容器显示高介电击穿电场强度，其级数为1000 kV/mm（即1GV/m），其比AL2O3介电强度的表值大得多。相应的能量密度比公共电解电容器的能量密度大10至100倍。此外，我们发现介电层中存储的电荷量可以相等，甚至可以超过存储在电容器板上的电荷量。介电排放电流遵循幂律时间依赖性。我们建议一个模型来解释这种行为。
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.
