4.6 Article

The Specific Capacitive Performances of the Manganese Oxyhydroxide/Carbon microcoil Electrodes for Supercapacitors

期刊

ELECTROCHIMICA ACTA
卷 151, 期 -, 页码 134-139

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.11.007

关键词

Carbon microcoils; Manganese Oxyhydroxide; Capacitance; Supercapacitor

资金

  1. Fundamental Research Funds for the Central Universities [2013XK07]
  2. Natural Science Foundation of Jiangsu Province for Youth in China [BK2012134]

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Manganese oxyhydroxide (MnOOH)/carbon microcoil (CMC) composites are fabricated by micro-wave deposition. Then, their structures are characterized by scanning, transmission electron microscopy and X-ray diffraction. This work presents an extensive study of the pseudocapacitive performances of the as-prepared MnOOH@CMC electrodes in mild Na2SO4 electrolyte. It shows a specific capacitance of 396 F g(-1) at a scan rate of 2 mV s(-1). Moreover, these binary composites exhibit a good rate capability and cycling stability, retaining 137.6 F g(-1) at current density of 2 A g(-1) after 10,000 cycles. The good electrochemical performances of the composites are attributed to the ions from the electrolyte can easily diffusing into almost all pores of the electrode, leading to a complete insertion reaction. (C) 2014 Elsevier Ltd. All rights reserved.

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