Self-assembly of free-standing surface-oxidized multilayer graphene film for high volumetric supercapacitors

To maximize the performance of a supercapacitor at a device level, it is essential to increase the volumetric capacitance of electrodes and decrease the fraction of inactive components. However, it is still a challenge to achieve these two goals. Here, we prepared surface-oxidized multi-layer graphe...

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Bibliographic Details
Published inCarbon (New York) Vol. 213; p. 118286
Main Authors Fu, Yongzhong, Xu, Lei, Tian, Wensheng, Liu, Yuan, Cao, Dawei, Wang, Quan
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.09.2023
Subjects
Electrochemical
Free-standing
Graphene
Supercapacitor device
Volumetric performance
Volumetric performance
Graphene
Free-standing
Supercapacitor device
Electrochemical
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Summary:To maximize the performance of a supercapacitor at a device level, it is essential to increase the volumetric capacitance of electrodes and decrease the fraction of inactive components. However, it is still a challenge to achieve these two goals. Here, we prepared surface-oxidized multi-layer graphene (SMG) by a facile electrochemical method. The unique thickness and oxygen groups facilitate the balance of the porosity and density and benefit the preparation of free-standing graphene electrodes. The preparation method of free-standing SMG electrode exhibits all-sided superiorities, including simple, environmental, energy-saving, high-stability, etc. Furthermore, SMG can achieve a high capacitance of 217.6 F cm−3 and landmark energy density of 120.27 Wh L−1, which provides a potential perspective for practical applications in energy storage.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2023.118286