Direct anodic exfoliation of graphite onto high-density aligned graphene for large capacity supercapacitors
Direct anodic exfoliation of graphite onto high-density aligned graphene for large capacity supercapacitors
复制标题
将石墨直接阳极剥离到高密度定向石墨烯上，用于大容量超级电容器
DOI：
10.1016/j.nanoen.2017.03.007
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发表时间：
2017-04
期刊：
影响因子：
17.6
通讯作者：
Chu Paul K.
中科院分区：
文献类型：
--
作者：
Hu Liangsheng;Peng Xiang;Li Yong;Wang Lei;Huo Kaifu;Lee Lawrence Yoon Suk;Wong K. Y.;Chu Paul K.
在具有大量边缘平面和开放通道的导电基底上制备的垂直取向的石墨烯纳米片（VOGN）是电化学双层（EDL）电容器电极的理想材料。然而，制备具有高密度石墨烯纳米片的这种结构是具有挑战性的。在此，描述了一种简单、环境友好且经济的直接在具有高质量负载的导电石墨板上制备高质量VOGN的技术。通过石墨的电化学阳极氧化获得VOGN，并且产生大量的对齐的还原氧化石墨烯（rGO）并牢固地粘附到石墨基底（G@rGO）。由G@rGO电极组成的对称超级电容器在6 M KOH中在7.5 mA cm-3的电流密度下表现出3.9 F cm-3的高体积电容和0.66 Wh L-1的能量密度（基于整个电极的体积）。速率性能和长期循环稳定性非常好。出色的电容性能可以归因于G@rGO电极的独特结构，其促进电解质和石墨烯表面之间的离子传输，最小化电荷存储的分布性质，加速EDL的形成，并通过避免石墨烯纳米片的重新堆叠和聚集来增强石墨烯的电化学利用和稳定性。
Vertically oriented graphene nanosheets (VOGNs) fabricated on conductive substrates with a large amount of edge planes and open channels are ideal for electrochemical double-layer (EDL) capacitor electrodes. However, preparation of such a structure with high-density of graphene nanosheets is challenging. Herein, a facile, environment-friendly, and economical technique to prepare high-quality VOGNs directly on conductive graphite plates with a high mass loading is described. The VOGNs are obtained by electrochemical anodization of graphite and a large amount of aligned reduced graphene oxide (rGO) is produced and adheres strongly to the graphite substrate (G@rGO). The symmetrical supercapacitors composed of the G@rGO electrodes exhibit a high volumetric capacitance of 3.9 F cm−3and energy density of 0.66 Wh L−1(based on the volume of the whole electrode) at a current density of 7.5 mA cm−3in 6 M KOH. The rate performance and long-term cycling stability are very good. The outstanding capacitive performance can be attributed to the unique structure of the G@rGO electrode which facilitates transportation of ions between the electrolyte and graphene surface, minimizes the distributive nature of charge storage, expedites the formation of EDL, and enhances the electrochemical utilization of graphene and stability by avoiding restacking and aggregation of graphene nanosheets.
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影响因子：
29.4
作者：
Lee, Jong Hak;Shin, Dong Wook;Yoo, Ji-Beom
通讯作者：
Yoo, Ji-Beom
影响因子：
15
作者：
Wei Wei-Wei;Gang Wang;Sheng Yang;Xinliang Feng;K. Müllen
通讯作者：
Wei Wei-Wei;Gang Wang;Sheng Yang;Xinliang Feng;K. Müllen
DOI：
--
发表时间：
1995-02
期刊：
--
影响因子：
--
作者：
J. Moulder;J. Chastain;R. C. King
通讯作者：
J. Moulder;J. Chastain;R. C. King
影响因子：
29.4
作者：
Bo, Zheng;Zhu, Weiguang;Feng, Xinliang
通讯作者：
Feng, Xinliang
影响因子：
29.4
作者：
Beguin, Francois;Presser, Volker;Frackowiak, Elzbieta
通讯作者：
Frackowiak, Elzbieta