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On-chip micro-supercapacitors for operation in a wide temperature range

Abstract : Onion-like carbon (OLC) based micro-supercapacitor electrodes prepared by electrophoretic deposition (EPD) were combined with a eutectic mixture of ionic liquids (IL), producing a micro-supercapacitor which is able to function from −50 °C to 80 °C. This device was electrochemically characterized by cyclic voltammetry and electrochemical impedance spectroscopy at different scan rates and different temperatures. At 20 °C, a capacitance of 1.1−2 per footprint area of device at 200 mV.s−1 within 3.7 V was measured, hence a specific energy of 15−2 and a specific power of 240−2. At−50 °C, 76% of the capacitance wasmaintained at 10 mV.s−1 within 3.7 V. By integrating with IL, this micro-supercapacitor can be potentially used in portable electronic devices that are required to work under temperature extremes.
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Submitted on : Friday, April 11, 2014 - 8:29:07 AM
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Peihua Huang, David Pech, Rongying Lin, John K. Mcdonough, Magali Brunet, et al.. On-chip micro-supercapacitors for operation in a wide temperature range. Electrochemistry Communications, Elsevier, 2013, vol. 36, pp. 53-56. ⟨10.1016/j.elecom.2013.09.003⟩. ⟨hal-00977350⟩



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