Ultraporous nitrogen-doped zeolite-templated carbon for high power density aqueous-based supercapacitors

María José Mostazo-López, Ramiro Ruiz-Rosas, Alberto Castro-Muñiz, Hirotomo Nishihara, Takashi Kyotani, Emilia Morallón, Diego Cazorla-Amorós

    Research output: Contribution to journalArticlepeer-review

    52 Citations (Scopus)

    Abstract

    Two zeolite templated carbons (ZTC) with comparable structure and different surface chemistry have been synthesized by chemical vapor deposition of different precursors, producing a non-doped and a N-doped carbon material (4 at. % XPS) in which most of the functionalities are quaternary N. A larger specific capacitance (farads per surface area) has been measured in acid electrolyte for the N-doped ZTC, that can be related to an improved wettability due to the presence of nitrogen and oxygen. The capacitance of N-doped ZTC is lower in alkaline electrolyte, probably due to the loss of electrochemical activity of certain oxygen functionalities. Interestingly, the electro-oxidation process of N-ZTC implies lower irreversible currents (providing higher electrochemical stability) than for ZTC. The presence of quaternary nitrogen greatly improves the electric conductivity of N-ZTC, which shows a superior rate performance. ZTC and N-ZTC capacitors were constructed using 1 M H2SO4. Under the same conditions, N-doped ZTC based capacitor has higher energy density, 6.7 vs 5.9 W h/kg. The power density of N-ZTC is four times higher, producing an outstanding maximum power of 98 kW/kg. These results provide clear evidences of the advantages of doping advanced porous carbon materials with nitrogen functionalities.

    Original languageEnglish
    Pages (from-to)510-519
    Number of pages10
    JournalCarbon
    Volume129
    DOIs
    Publication statusPublished - 2018 Apr

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Science(all)

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