Supercapattery based on binder-free Co3 (PO4)2·8H2O multilayer nano/microflakes on nickel foam

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Shao, Han
Padmanathan, Narayanasamy
McNulty, David
O'Dwyer, Colm
Razeeb, Kafil M.
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American Chemical Society Publications
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A binder-free cobalt phosphate hydrate (Co3(PO4)2·8H2O) multilayer nano/microflake structure is synthesized on nickel foam (NF) via a facile hydrothermal process. Four different concentrations (2.5, 5, 10, and 20 mM) of Co2+ and PO4–3 were used to obtain different mass loading of cobalt phosphate on the nickel foam. The Co3(PO4)2·8H2O modified NF electrode (2.5 mM) shows a maximum specific capacity of 868.3 C g–1 (capacitance of 1578.7 F g–1) at a current density of 5 mA cm–2 and remains as high as 566.3 C g–1 (1029.5 F g–1) at 50 mA cm–2 in 1 M NaOH. A supercapattery assembled using Co3(PO4)2·8H2O/NF as the positive electrode and activated carbon/NF as the negative electrode delivers a gravimetric capacitance of 111.2 F g–1 (volumetric capacitance of 4.44 F cm–3). Furthermore, the device offers a high specific energy of 29.29 Wh kg–1 (energy density of 1.17 mWh cm–3) and a specific power of 4687 W kg–1 (power density of 187.5 mW cm–3).
Cobalt phosphate hydrate , Electrochemical , Energy storage device , Nanomaterial , Supercapacitor , Supercapattery
Shao, H., Padmanathan, N., McNulty, D., O'Dwyer, C. and Razeeb, K. M. (2016) 'Supercapattery based on binder-free Co3 (PO4) 2· 8H2O multilayer nano/microflakes on nickel foam', ACS Applied Materials and Interfaces, 8(42), pp. 28592-28598. doi:10.1021/acsami.6b08354
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© 2016, American Chemical Society. This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in ACS Applied Materials and Interfaces, copyright © American Chemical Society, after peer review. To access the final edited and published work see