Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 3, Pages 1992-2000Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b10280
Keywords
ultrathin; nanolayer; Ni-Co hydroxide; supercapacitor; cycling stability
Funding
- NSFC [51202213]
- CPSF [2013M530889, 2014T70230]
- EYSFHP [Y2012005]
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Nanolayered structures present significantly enhanced electrochemical performance by facilitating the surface -dependent electrochemical reaction processes for super capacitors, which, however, causes capacitance fade upon cycling due to their poor chemical stability. In this work, we report a simple and effective approach to develop a stable, high performance electrode material by integrating 2D transition metal hydroxide and reduced graphene oxide sheets at nanometer scale. Specifically, a hybrid nanolayer of Ni-Co hydroxide @reduced graphene oxide (Ni,Co OH/rGO) with an average thickness of 1.37 nm is synthesized through an easy one -pot hydrothermal method. Benefiting from the face to face contact model between Ni-Co hydroxide and rGO sheets, such unique structure presents superior specific capacitance and cycling performance as compared to the pure Ni-Co hydroxide nanolayers. An asymmetric supercapacitor based on Ni,Co-OH/rGO and three-dimensional (3D) hierarchical porous carbon is developed, exhibiting a high energy density of 56.1 Wh kg(-1) along with remarkable cycling stability (80% retention after 17 000 cycles), which holds great promise for practical applications in energy storage devices.
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