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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
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Asymmetric All-Metal-Oxide Supercapacitor with Superb Cycle Performance
Chongyang Yang1, Minqiang Sun1, Hongbin Lu1
1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Collaborative Innovation Center of Polymers and Polymer Composites, Fudan University, 2005 Songhu Road, Shanghai, 200438, P. R. China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|February 25, 2018
Summary
This study introduces novel all-metal-oxide asymmetric supercapacitors (ASCs) using tin dioxide (SnO2) and molybdenum trioxide (MoO3) on reduced graphene oxide (RGO). These ASCs achieve high energy density and excellent cycling stability for advanced energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Metal oxides offer high specific capacitances for supercapacitors but face challenges in balancing energy density, rate capability, and cycle life.
- Developing high-performance supercapacitors requires innovative electrode materials and device architectures.
- Asymmetric supercapacitors (ASCs) present a promising avenue for enhanced energy and power density.
Purpose of the Study:
- To design and fabricate all-metal-oxide asymmetric supercapacitors (ASCs) with improved electrochemical performance.
- To investigate the synergistic effects of SnO2 nanoparticles anchored on reduced graphene oxide (RGO) as a cathode and RGO/MoO3 nanosheets as an anode.
- To demonstrate the potential of these ASCs for high-energy and long-lasting energy storage applications.
Main Methods:
- Synthesized SnO2 nanoparticles anchored on reduced graphene oxide (RGO) via Sn-O-C bonds for the cathode.
- Prepared low-crystalline RGO/MoO3 nanosheets for use as the anode, leveraging the work function difference between SnO2 and MoO3.
- Assembled and tested the performance of the all-metal-oxide ASC in a neutral aqueous electrolyte.
Main Results:
- The fabricated ASC operates stably at 1.8 V in a neutral aqueous electrolyte.
- Achieved a high energy density of up to 33 Wh kg-1, retaining 13.8 Wh kg-1 at a high power density of 37.5 kW kg-1.
- Demonstrated excellent cycling stability with 92.5% capacitance retention after 20,000 cycles.
Conclusions:
- The proposed all-metal-oxide ASC strategy effectively addresses the limitations of traditional supercapacitors.
- The combination of SnO2/RGO and RGO/MoO3 nanosheets offers a synergistic approach for high-performance energy storage.
- These findings pave the way for the development of next-generation supercapacitors with superior energy density and cycle life.
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