Supercapattery Based on Binder-Free Co3(PO4)2·8H2O Multilayer Nano/Microflakes on Nickel Foam.
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 PO4-3were 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-2and remains as high as 566.3 C g-1(1029.5 F g-1) at 50 mA cm-2in 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).
Micro-Nano Systems Centre, Tyndall National Institute, University College Cork , Dyke Parade, Lee Maltings, Cork T12 R5CP, Ireland.|Department of Chemistry, University College Cork , Cork T12 YN60, Ireland.
Han
H
Shao
Micro-Nano Systems Centre, Tyndall National Institute, University College Cork , Dyke Parade, Lee Maltings, Cork T12 R5CP, Ireland.
N
N
Padmanathan
Department of Chemistry, University College Cork , Cork T12 YN60, Ireland.
David
D
McNulty
Micro-Nano Systems Centre, Tyndall National Institute, University College Cork , Dyke Parade, Lee Maltings, Cork T12 R5CP, Ireland.|Department of Chemistry, University College Cork , Cork T12 YN60, Ireland.
Colm
C
O Dwyer
Micro-Nano Systems Centre, Tyndall National Institute, University College Cork , Dyke Parade, Lee Maltings, Cork T12 R5CP, Ireland.
Kafil M
KM
Razeeb
cobalt phosphate hydrate; electrochemical; energy storage device; nanomaterial; supercapacitor; supercapattery