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Hollow carbon nanospheres decorated with CoxNi1−xMoO4 nanosheets showed extraordinary rate performance and cycling stability as electrodes in supercapacitors.

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The enhancement of electrochemical capacitance of biomass-carbon by pyrolysis of extracted nanofibers, Electrochimica Acta http://dx.doi.org/10. 1016/j.electacta.2017.01.099 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. extracted from an inexpensive natural fungus using a hydrothermal method and were converted to porous carbon nanofibers (CNFs) by potassium hydroxide activation.The porous carbons were assembled into symmetric supercapacitors using both potassium hydroxide and an ionic liquid (IL) as electrolytes. Solid state nuclear magnetic resonance characterization showed that the micropores of the as-prepared carbons are accessible to the IL electrolyte when uncharged and thus high capacitance is expected. It is found in both electrolytes the electrochemical capacitances of CNFs are significantly higher than those of the porous carbon derived directly from the crude fungus. Furthermore, the CNFs delivered an extraordinary energy density of 92.3 Wh kg -1 in the IL electrolyte, making it a promising candidate for electrode materials for supercapacitors.