Striking capacitance of carbon/iodide interface
TP-AAB-AABC_2009_20
06/10/2009
- Content
- Exceptional electrochemical behaviour of carbon/iodide interface has been demonstrated and successfully used in supercapacitor application. This efficient charge storage is based on specific sorption of iodide ions as well as stable reversible redox reactions connected with various possible oxidation states of iodine from –1 to +5. An intriguing effect of iodide ions has been observed for positive electrode operating in a narrow range of potential and giving extremely high capacitance values exceeding 1840 F/g. KI plays a useful dual role, i.e. electrolytic solution with a good ionic conductivity as well as a source of pseudo-capacitive effects. As opposed to typical pseudocapacitance effects, which are often characterized by some diffusion limitations and observed only at moderate regimes, our innovative two-electrode system can be loaded until 50 A/g supplying still 125 F/g. Amazing capacitance of carbon/iodide interface has also been confirmed during long-term cycling (over 10 000 cycles).
- Citation
- Frackowiak, E., and Lota, G., "Striking capacitance of carbon/iodide interface," SAE Technical Paper TP-AAB-AABC_2009_20, 2009, .