In-Situ Fabrication of MOF-Derived Co−Co Layered Double Hydroxide Hollow Nanocages/Graphene Composite: A Novel Electrode Material with Superior Electrochemical Performance
Document Type
Article
Publication Date
10-20-2017
Abstract
Rational design of a transition metal layered double hydroxide (LDH) and graphene composite is vitally important for designing high-performance supercapacitor electrodes. Although various methods are performed, the realization of high-performance is still impeded by the agglomeration of graphene and layered double hydroxide. Here, metal–organic framework derived cobalt–cobalt layered double hydroxide (Co−Co LDH) hollow nanocages, uniformly deposited on graphene nanosheets, are fabricated through facile in situ co-deposition and thermal ion-exchange reaction. Electrochemical investigation reveals that Co−Co LDH/15 mg graphene is rather outstanding, which delivers high specific capacitance of 1205 F g−1, excellent rate capability (60.3 % capacitance retention is obtained after the current density increased 6.67 times), and cycling stability. The excellent performance of electrode is also confirmed by assembling an asymmetric supercapacitor, which delivers high energy density of 49.5 Wh kg−1 as well as the maximum power density of 7000 W kg−1. The Co−Co LDH/graphene composite proves a promising concept for constructing hierarchical structure materials in the future.
Publication Source (Journal or Book title)
Chemistry - A European Journal
First Page
14839
Last Page
14847
Recommended Citation
Bai, X., Liu, J., Liu, Q., Chen, R., Jing, X., Li, B., & Wang, J. (2017). In-Situ Fabrication of MOF-Derived Co−Co Layered Double Hydroxide Hollow Nanocages/Graphene Composite: A Novel Electrode Material with Superior Electrochemical Performance. Chemistry - A European Journal, 23 (59), 14839-14847. https://doi.org/10.1002/chem.201702676