Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 876, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2020.114489
Keywords
Graphene hydrogel; cZIF-8; N-doped graphene quantum dots; Areal energy density; Volumetric energy density
Categories
Funding
- National Natural Science Foundation of China [11975148, 11775138]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13078]
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Graphene hydrogel (GH) has been widely explored as electrode material for supercapacitors due to its threedimensional porous network structure. However, poor conductivity and low capacitance activity have limited practical application. Herein, we design and fabricate a hierarchical all-carbon GH-based electrode material decorated with MOF-derived porous carbon (cZIF-8) and highly N-doped graphene quantum dots. In this N-GQD@cZIF-8/GHcomposite, GH constructs an interconnected porous structure which benefits rapid electron/ion transport, and cZIF-8 provides a large specific surface area and enhances electrical conductivity, while N-GQDs contribute pseudo-capacitance and improve the wettability. The supercapacitor based on N-GQD@cZIF-8/GH shows a high areal capacitance (617.1 mF cm(-2)) and areal energy density (85.7 mu Wh cm(-2)) at 1 mA cm(-2). It also has good rate capability (81.5% at 20 mA cm(-2)) and excellent cycling stability (93.1% after 10,000 cycles). Moreover, the assembled all-solid-state flexible supercapacitor can deliver a high energy density of 18.1 mWh cm(-3) at high power density of 4907.3 mW cm(-3). This rational-designed all-carbon electrode opens up opportunities in the fabrication of next-generation wearable electronic equipments.
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