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Maricite (NaMn1/3Ni1/3Co1/3PO 4)/activated carbon: Hybrid capacitor

Minakshi, M., Meyrick, D. and Appadoo, D. (2013) Maricite (NaMn1/3Ni1/3Co1/3PO 4)/activated carbon: Hybrid capacitor. Energy & Fuels, 27 (6). pp. 3516-3522.

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A hybrid capacitor comprising mixed transition-metal sodium phosphate/activated carbon (AC) with sodium hydroxide electrolyte is reported for the first time. The sodium phosphate (maricite, NaMn1/3Ni 1/3Co1/3PO4) positive material was prepared by both urea-assisted combustion and polyvinyl pyrrolidone (PVP)-assisted sol-gel syntheses. The electrochemical behavior of maricite and AC was characterized by cyclic voltammetry (CV) and charge-discharge methods. The reaction mechanism at the maricite electrode in NaOH(aq) electrolyte appears to be reversible, involving a faradaic process, while the AC shows capacitive behavior involving a non-faradaic process. The aqueous hybrid capacitor, maricite (as the cathode), and AC (as the anode) studied by galvanostatic (charge-discharge) cycling in the range of 0-1.6 V at 0.5 A g-1 exhibited a specific discharge capacitance of 45 F g-1 stable over 1000 cycles.

Publication Type: Journal Article
Murdoch Affiliation: School of Chemical and Mathematical Science
School of Veterinary and Life Sciences
Publisher: American Chemical Society
Copyright: © 2013 American Chemical Society.
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