ULTRAPOROUS NITROGEN-DOPED ZEOLITE-TEMPLATED CARBON FOR HIGH ENERGY DENSITY AQUEOUS-BASED SUPERCAPACITORS

摘要

The development of the greener, safer and cheaper aqueous-based supercapacitors is severely limited by their low operational voltage. In consequence, their energy density is lower than those supercapacitors that use organic-based electrolytes. One of the common strategies envisaged for overcoming that constraint are the development of ultraporous carbon materials in order to maximize the capacitance and the introduction of electroactive surface groups for improving the the pseudocapacitance. For the later strategy, nitrogen functional groups have been found to enhance the electrochemical performance of carbon materials [1,2], while in the case of the former one, zeolite-templated carbons (ZTC) with a unique 3 D-ordered microporous structure that shows extremely profitable properties for the intended application can be synthesized [3]. Unfortunately, the most common nitrogen-doping strategies compromise the structural integrity of this material, and in consequence, alternative methodologies are necessary for the introduction of heteroatoms in their surface.