期刊
JOURNAL OF ENERGY STORAGE
卷 31, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.est.2020.101649
关键词
In-situ hydrolysis; 3D NiCo layered double hydroxide; Metal-organic framework; Supercapacitor
资金
- National Science Foundation [51671013]
- Beijing Natural Science Foundation [2172032]
Layered double hydroxide (LDH) is commonly employed as supercapacitor electrode due to its high theoretical and experimental capacitance, but limited by its easily agglomerated structure. Herein, a three-dimensional nickel cobalt-layered double hydroxide on carbon fiber cloth (NiCo-LDH/CFC) is synthesized via an in-situ hy-drolysis of Co-based metal organic framework array (Co-MOF) for supercapacitors. Both the metal sites and overall morphology of Co-MOF are well maintained inner NiCo-LDH/CFC, providing sufficient active sites and rapid diffusion kinetics for charge storage. Consequently, an optimal specific capacitance of 2685 F g(-1) (1074 C g-1) is achieved for NiCo-LDH/CFC electrode, higher than that of powdered NiCo-LDH (1352 F g(-1) or 540.8 C g(-1)). Moreover, a hybrid supercapacitor is assembled with NiCo-LDH/CFC as positive electrode and active carbon as negative electrode. The hybrid device exhibits a high energy density of 64.9 Wh kg-1, a maximum power density of 16.9 kW kg(-1), and long cycling stability (82.7% capacitance retention after 3000 cycles). These results indicate the great potential of in-situ hydrolysis of MOFs for high performance energy storage electrode materials.
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