Enhancement mechanism of electrochemical capacitance in nitrogen-boron-doped carbons with uniform straight nanochannels

Taeri Kwon, Hirotomo Nishihara, Hiroyuki Itoi, Quan Hong Yang, Takashi Kyotani

    Research output: Contribution to journalArticlepeer-review

    178 Citations (Scopus)

    Abstract

    Anodic aluminum oxide (AAO) with uniform straight nanochannels was completely coated with pure, N-doped, or B-doped carbon layer. Their electric double layer capacitances are measured in aqueous (1Msulfuric acid) and organic (1 M Et4NBF4/polypropylene carbonate) electrolyte solutions in order to investigate the capacitance enhancement mechanisms caused by N-or B-doping. Since the three types of carbon-coated AAOs (pure, N-doped, or B-doped) have exactly the same pore structure, the observed capacitance enhancement was ascribable to only the following factors: (i) better wettability, (ii) the decrease of equivalent series resistance, (iii) the contribution of space-charge-layer capacitance, and (iv) the occurrence of pseudocapacitance. From the measurements of the wettability and the electrical resistance of the coated AAOs together with the electrochemical investigation (the cyclic voltammetry, the galvanostatic charge/discharge cycling, and the impedance analysis), it is concluded that the pseudocapacitance through faradic charge transfer (factor iv) is the most important factor to enhance the capacitance by N-or B-doping. This can be applied to not only the present carbon-coated AAOs but also any other porous carbons.

    Original languageEnglish
    Pages (from-to)11961-11968
    Number of pages8
    JournalLangmuir
    Volume25
    Issue number19
    DOIs
    Publication statusPublished - 2009 Oct 6

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Surfaces and Interfaces
    • Spectroscopy
    • Electrochemistry

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