Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 35, Pages 22997-23005Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b05496
Keywords
monolayer; Ni-Co hydroxyl carbonate; supercapacitor; solid-state; cycling stability
Funding
- National Science Foundation of China (NSFC) [51202213, 21403188, 21336003]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars [CG2014003002]
- 973 Program of China [2014CB239703]
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The emergence of atomically thick nanolayer materials, which feature a short ion diffusion channel and provide more exposed atoms in the electrochemical reactions, offers a promising occasion to optimize the performance of supercapacitbrs on the atomic level. In this work, a novel monolayer Ni-Co hydroxyl carbonate with an average thickness of 1.07 nm is synthesized via an ordinary one-pot hydrothermal route for the first time. This unique monolayer structure can efficiently rise up the exposed electroactive sites and facilitate the surface dependent electrochemical reaction processes, and thus results in outstanding specific capacitance of 2266 F g(-1). Based on this material, an all-solid-state asymmetric supercapacitor is developed adopting alkaline PVA. (poly(vinyl alcohol)) gel (PVA/KOH) as electrolyte, which performs remarkable cycling stability (no capacitance fade after 19 000 cycles) together with promising energy density of 50 Wh kg(-1) (202 mu Wh cm(-2)) and high power density of 8.69 kW kg(-1) (35.1 mW cm(-2)). This as-assembled all-solid-state asymmetric supercapacitor (AASC) holds great potential in the field of portable energy storage devices.
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