Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 40, Pages 22364-22371Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b06187
Keywords
hybrid film; graphene; metal oxide; microwave; supercapacitor
Funding
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning of Korea [2014R1A5A2010008, 2015R1C1A1A02036556]
- Research and Development Program of Korea Institute of Energy Research [B5-2414]
- Dongguk University
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Carbon-based electrochemical double-layer capacitors and pseudocapacitors, consisting of a symmetric configuration of electrodes, can deliver much higher power densities than batteries, but they suffer from low energy densities. Herein, we report the development of high energy and power density supercapacitors using an asymmetric configuration of Fe2O3 and MnO2 nanoparticles incorporated into 3D macroporous graphene film electrodes that can be operated in a safe and low-cost aqueous electrolyte. The gap in working potential windows of Fe2O3 and MnO2 enables the stable expansion of the cell voltage up to 1.8 V, which is responsible for the high energy density (41.7 Wh kg(-1)). We employ a household microwave oven to simultaneously create conductivity, porosity, and the deposition of metal oxides on graphene films toward 3D hybrid architectures, which lead to a high power density (13.5 kW kg(-1)). Such high energy and power densities are maintained for over 5000 cycles, even during cycling at a high current density of 16.9 A g(-1).
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