Prussian blue based vertical graphene 3D structures for high frequency electrochemical capacitors
Prussian blue based vertical graphene 3D structures for high frequency electrochemical capacitors
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DOI：
10.1016/j.ensm.2020.07.016
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发表时间：
2020-11-01
影响因子：
20.4
通讯作者：
Fan, Zhaoyang
中科院分区：
文献类型：
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作者：
Li, Wenyue;Azam, Sakibul;Fan, Zhaoyang
千赫高频电化学电容器(HF-EC)具有体积小、体积小等优点，目前正被广泛研究，主要应用于线频纹波电流滤波等领域。然而，已报道的由电极结构直接决定的性能，特别是可实现的电容密度、频率响应和相角仍远远不能令人满意，这阻碍了它的实际应用前景。在这项工作中，引入金属有机骨架(普鲁士蓝，PB)作为结构介体，通过5分钟的快速等离子体碳化和沉积过程，在集流器上形成三维垂直石墨烯结构或边缘取向石墨烯(EOG)。将几个突出的优点集成在所得到的EOG电极结构中，HF-ECS表现出非常低的等效串联电阻(ESR)(40m Omega cm(-2))和1.02 mF cm(-2)的吸引电池电容，以及-85.9度或2.34 mF cm(-2)和-80.6度的相角，这是迄今为止报道的最好的整体性能。还组装了集成单元，以工作在更高的电压下，用于行频纹波滤波，表现出良好的性能。本研究为研制高性能HF-ECS提供了一种新的方法和结构。
Kilohertz high frequency electrochemical capacitors (HF-ECs), with a compact size, are being actively investigated with the aim for line-frequency ripple current filtering and other applications. However, the reported performance, particularly achievable capacitance density, the frequency response, and the phase angle that are directly determined by the electrode structure is still far from satisfactory that hinders its practical application prospect. In this work, metal organic framework (Prussian Blue, PB) is introduced as a structural mediator to develop three-dimensional vertical graphene architecture, or edge-oriented graphene (EOG) on a current collector via a 5-min rapid plasma carbonization and deposition process. With several prominent merits integrated together in the resulted EOG electrode structure, HF-ECs exhibit very low equivalent series resistance (ESR) of 40 m Omega cm(-2) and attractive cell capacitance of 1.02 mF cm(-2) and phase angle of -85.9 degrees or 2.34 mF cm(-2) and -80.6 degrees at 120 Hz, which are the best reported overall performances thus far. Integrated cell is also assembled to work higher voltage for line-frequency ripple filtering, with demonstrated excellent performance. This study provides a new method and structure for developing high-performance HF-ECs.