50-100 μm-thick pseudocapacitive electrodes of MnO2 nanoparticles uniformly electrodeposited in carbon nanotube papers

Misato Narubayashi, Zhongming Chen, Kei Hasegawa, Suguru Noda

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    To overcome the tradeoff between the gravimetric capacitance and loading density of pseudocapacitive MnO2, we electrodeposited MnO2 nanoparticles on the carbon nanotube (CNT) surfaces in 18-37 μm-thick self-supporting CNT papers. We examined the electrodeposition conditions including constant potential, constant current, and potential pulses, and obtained MnO2-CNT hybrid electrodes containing MnO2 nanoparticles uniformly deposited at 60-90 wt% with an expanded CNT matrix. The MnO2-CNT hybrid electrode with a thickness of 62 μm, density of 1.09 g cm-3, areal mass of 6.75 mg cm-2, and 82 wt% MnO2 load showed a total gravimetric capacitance of 120 and 51 Ftotal gelectrode -1, volumetric capacitance of 131 and 56 Ftotal cm-3 and areal capacitance of 0.81 and 0.34 Ftotal cm-2 at scan rates of 2 and 200 mV s-1, respectively. The large thickness, moderately high mass density, and fairly conductive CNT matrix realized such high values of gravimetric, areal and volumetric capacitances that are important for practical devices.

    Original languageEnglish
    Pages (from-to)41496-41505
    Number of pages10
    JournalRSC Advances
    Volume6
    Issue number47
    DOIs
    Publication statusPublished - 2016

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Chemistry(all)

    Fingerprint Dive into the research topics of '50-100 μm-thick pseudocapacitive electrodes of MnO<sub>2</sub> nanoparticles uniformly electrodeposited in carbon nanotube papers'. Together they form a unique fingerprint.

  • Cite this