Nanomaterials (Oct 2021)

Extended Graphite Supported Flower-like MnO<sub>2</sub> as Bifunctional Materials for Supercapacitors and Glucose Sensing

  • Han-Wei Chang,
  • Chung-Li Dong,
  • Yan-Hua Chen,
  • Yuan-Zhang Xu,
  • Tzu-Chi Huang,
  • Song-Chi Chen,
  • Feng-Jiin Liu,
  • Yin-Hung Lai,
  • Yu-Chen Tsai

DOI
https://doi.org/10.3390/nano11112881
Journal volume & issue
Vol. 11, no. 11
p. 2881

Abstract

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A simple, efficient, and cost-effective extended graphite as a supporting platform further supported the MnO2 growth for the construction of hierarchical flower-like MnO2/extended graphite. MnO2/extended graphite exhibited an increase in sp2 carbon bonds in comparison with that of extended graphite. It can be expected to display better electrical conductivity and further promote electron/ion transport kinetics for boosting the electrochemical performance in supercapacitors and glucose sensing. In supercapacitors, MnO2/extended graphite delivered an areal capacitance value of 20.4 mF cm−2 at 0.25 mA cm−2 current densities and great cycling stability (capacitance retention of 83% after 1000 cycles). In glucose sensing, MnO2/extended graphite exhibited a good linear relationship in glucose concentration up to about 5 mM, sensitivity of 43 μA mM−1cm−2, and the limit of detection of 0.081 mM. It is further concluded that MnO2/extended graphite could be a good candidate for the future design of synergistic multifunctional materials in electrochemical techniques.

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