The superior electrochemical performance (a 2.5-fold improvement in the capacitance compared with previous results24) of the as-prepared electrode in H2SO4 (top inset of Fig. 3a) can be explained by the following two characteristics: (1) the binder-free interfaces of the PCMSs and (2) the surface oxygen groups. The binder-free attachment of the PCMSs improved the electrical conductivity and allowed the electrolyte ions to diffuse easily through the open pore channels of the PCMS13. The polarized carbon-oxygen surface groups attract water molecules, increase the wettability of the PCMSs and fully utilize the surface of the PCMS32. These groups also provide active sites for reactions24 and contribute to pseudocapacitance33,34,35, which leads to the observed quasi-rectangular cyclic voltammetric curves27 (top inset of Fig. 3a).
Redox Titration Curve Pdf Free
In summary, we define an electrolyte for surface-functionalized, porous and binder-free carbon-based electrode that was prepared by a facile dip and dry method. We demonstrate that this design exhibits ultrahigh voltammetric capacitance and energy density resulting from redox reactions between surface oxygen groups and CuCl2 in acidic media. The electrode has a long cycle life that is attributed to the stability of the oxygen surface groups and the binder-free contact between the active material and the microwires. The outstanding electrochemical performance demonstrates the effectiveness of this strategy to enhance the capacitance and cycle lifetime. This strategy has great potential for the development and large-scale applications of high-performance supercapacitors.
How to cite this article: Mai, L.-Q. et al. Synergistic interaction between redox-active electrolyte and binder-free functionalized carbon for ultrahigh supercapacitor performance. Nat. Commun. 4:2923 doi: 10.1038/ncomms3923 (2013).
If the redox reaction does not produce a well-defined colour change at the equivalence point, an indicator should be used in the titration.Starch can be used as an indicator for redox titrations using iodine as the titrant (iodine is a weak oxidising agent) because starch forms a blue complex with iodine.
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