Journal
ELECTROCHIMICA ACTA
Volume 327, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.135014
Keywords
High-rate supercapacitor; 3D graphene sponge; Ionic liquid/aqueous dual electrolyte; In situ gas analysis; Differential electrochemical mass spectrometry
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Funding
- Thailand Research Fund
- Vidyasirimedhi Institute of Science and Technology [RSA6180031]
- Energy Policy and Planning Office (EPPO), Ministry of Energy, Thailand
- Vidyasirimedhi Institute of Science and Technology (VISTEC)
- Frontier Research Centre at VISTEC
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Non-traditional electrolytes like water-in-salt and dual electrolyte are emerging as promising electrolytes for next-generation energy storage devices. However, their low rate capability is a major obstacle for their extensive employment. Here, we achieve a high-rate aqueous/ionic liquid dual electrolyte supercapacitor using 3D interconnected graphene sponge with a high pore volume of 5.6 cm(3) g(-1). It delivers a high rate of 30 A g(-1) and the maximum cell potential of 2.0 V. The maximum specific energy of 9.1 Wh kg(-1) at 0.5 A g(-1) and the specific power of 16.3 kW kg(-1) at 30 A g(-1) are achieved for the dual electrolyte. Excellent long-term stability of 85% is estimated for the applied cell potential of 2.0 V after 50,000 cycles at 5 A g(-1). In situ gas analysis using differential electrochemical mass spectrometry identifies three gases (H-2, CO2 and CO) at the critical cell potentials. The possible cell potential-limiting electrode in the full cell is identified by the type of gas evolved at the maximum cell potentials. This high-rate supercapacitor may be useful for high-power applications. (C) 2019 Elsevier Ltd. All rights reserved.
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