Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 119, Issue 22, Pages 12165-12173Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b02335
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Funding
- Israel Science Foundation (ISF) in the framework of the Israel National Research Center for Electrochemical Propulsion (INREP)
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In this study, we present the positive effect of 1,10-phenanthroline as an electrolyte additive that is strongly adsorbed on activated carbon electrodes, thereby adding effective redox activity to their initially capacitive interactions with electrolyte solutions. We obtain a stable capacitance of 320 F/g for the negative electrode and 190 F/g(electrode) for full symmetric supercapacitor cells, operating up to 3.4 V in nonaqueous media, during many thousands of cycles. This corresponds to a specific capacity of 180 (mA h)/g(electrode). The high voltage and capacity of these systems can pave the way for developing high-energy-density pseudocapacitors that may be able to compete with battery systems. We explored the mechanisms of the electrode interactions using electrochemical tools, including impedance spectroscopy.
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