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The authors report the electrochemistry of a macropourous carbon/Co3O4 material. The electrochemistry shows more of a battery type behaviour rather than capicitive, so the relevence of the high capacitance numbers quoted is misleading. Ni and Co oxides have uses in hybrid devices as the battery type electrode (battery/supercaps). Authors need to clarify the technology their material is suited for. What is also missing is the more relevent volumetric measure of charge or capacity stored the thin nature of the electrode (low loading) and its large porosity probably results in a impractical electrode for real world devices. Though the material and electrochemical charactisation has been carried out competitantly the analysis needs improving and clarification to avoid confusing batteries with supercapacitors.
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where do batteries end and supercapacitors begin? Science; 2014; Vol 343; 1210-1211; DOI:10.1126/science.1249625
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