Abstract
A hybrid electrochemical energy storage device was fabricated in aqueous NaOH with the 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) nitroxide radical as the active material, hydroquinone as the counter electrode active material, and an OH−-selective separating membrane. The working principle of this device was investigated and it can be considered as a supercapacitor-battery hybrid energy storage system. Device performance was characterized by cyclic voltammetry and galvanostatic charge-discharge testing. When using multi-walled carbon nanotubes (MWCNTs) as electrode support materials, a high pseudo-capacitance of 1280 F g−1 was obtained with the TEMPO nitroxide radical as the active material at a 1 mV s−1 scan rate. This was ∼33 times larger than the inherent double layer capacitance of MWCNTs. The electrode material and active material dissolved in solution could potentially be substituted with similar materials. This simple design provides a new approach for fabricating high performance supercapacitor-battery hybrid energy storage devices.
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Guo, W., Xin, S., Ji, M. et al. Supercapacitor-battery hybrid energy storage devices from an aqueous nitroxide radical active material. Chin. Sci. Bull. 56, 2433–2436 (2011). https://doi.org/10.1007/s11434-011-4575-z
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DOI: https://doi.org/10.1007/s11434-011-4575-z