Journal
SURFACES AND INTERFACES
Volume 33, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.surfin.2022.102266
Keywords
Three-dimensional; Metal-organic framework; Graphene aerogel; Battery-supercapacitor hybrid device; Paper-like electrode
Categories
Funding
- National Natural Science Foundation of China [52002039]
- Research Initiation Fund for Teacher Development of Chengdu University of Technology [10912-2019KYQD-07543]
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The electrode materials, including 3D ZnCo2O4/GA cathode and 3D N-AC/GA anode, synthesized in this study by growing Zn-Co MOF and ZIF-8 on the 3D graphene aerogel showed excellent rate capability and capacity retention. The 3D ZnCo2O4/GA//3D N-AC/GA device achieved high energy density, high power density, and good cycle stability.
The inherent electrochemical performance of the electrode material is mainly decided by its morphology and architecture. Therefore, to address the issues of metal-organic frameworks (MOFs) derived materials with low electrical conductivity and easy aggregation. Herein, we successfully in-situ grow Zn-Co MOF and zeolitic imidazolate framework-8 (ZIF-8) on the three-dimensional (3D) network structure of graphene aerogel (GA) to prepare 3D ZnCo2O4/GA cathode and 3D ZIF-8-derived N-doped active carbon/GA (N-AC/GA) anode for an alkaline battery-supercapacitor hybrid device, respectively. As a result, the 3D ZnCo2O4/GA delivers a high specific capacity of 241.1 mAh g(-1) at 0.5 A g(-1) and even retains 156 mAh g(-1) under 20 A g(-1), indicating an outstanding rate capability and capacity retention (-65%). Furthermore, the 3D N-AC/GA shows a high capacitance of 408.5 F g(-1) (corresponding to a specific capacity of 112.9 mAh g(-1)) at 0.5 A g(-1) and exhibits an excellent rate capability with -56% capacitance retention (-228 F g(-1)) even at 20 A g(-1). Then, the 3D ZnCo2O4/GA//3D N-AC/GA device achieves a maximum energy density of 30.5 Wh kg(-1), a maximum power density of 6.5 kW kg(-1), and good cycle stability with -76.9% capacity retaining capability over 10,000 cycles under 10 A g(-1). Besides, our samples can be easily coated on conductive polypyrrole-modified commercial printing paper to construct flexible electrodes.
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