Dense Reduced Graphene Oxide Films Obtained by Pressing Create Stable and Compact Capacitive Energy Storage,ChemElectroChem

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Dense Reduced Graphene Oxide Films Obtained by Pressing Create Stable and Compact Capacitive Energy Storage
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-04-14 , DOI: 10.1002/celc.202000246
Dou Lin _{1,

2} , Zihui Tang _{2,

3} , Qijun Pan _{2,

3} , Shiping Zhang _{2,

3} , Dexian Huo _{2,

3} , Sisi Yan _{2,

3} , Fangming Han ₂

Affiliation

It is generally believed that the re‐stacking of reduced graphene oxide (rGO) sheets limits the electrochemical energy storage. Therefore, rGO based electrodes are usually designed to be non‐compact porous and fluffy structures. However, fluffy structures could reduce the conductance, structure stability, and cycling stability of electrodes. Here, to balance the contradiction, three electrodes with different compactness were studied. Amazingly, dense rGO hydrogel films (DrGO‐HF) achieved by simply pressing filtrated rGO films, show highly stable (92 % capacitance retention after 250 000 cycles) and high‐performance compact capacitive energy storage, which can be attributed to the structural stability and electrical conductivity enhanced by the close contact between graphene sheets. This study clarifies the scientific fact that the re‐stacking of rGO sheets would not degrade the electrochemical energy storage performances, which is of great significance for the design and preparation of supercapacitor electrodes with high volumetric energy density.

中文翻译：

通过压制获得致密还原的氧化石墨烯薄膜可产生稳定而紧凑的电容储能

人们普遍认为，还原氧化石墨烯（rGO）片的重新堆叠会限制电化学能量的存储。因此，基于rGO的电极通常设计为非紧凑的多孔蓬松结构。但是，蓬松的结构会降低电极的电导率，结构稳定性和循环稳定性。在这里，为了平衡矛盾，研究了三个具有不同紧密度的电极。令人惊讶的是，通过简单地压制已过滤的rGO膜可得到致密的rGO水凝胶膜（DrGO-HF），具有很高的稳定性（在25万次循环后92％的电容保持率）和高性能的紧凑型电容储能，这归因于其结构稳定性和稳定性。石墨烯片之间的紧密接触增强了导电性。

更新日期：2020-04-14

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