Abstract
Nanocrystalline Co
2
P
2
O
7
and carbon nanofiber (Co
2
P
2
O
7
/CNFs) composites with enhanced electrochemical performance were obtained by calcination after a hydrothermal process with NH
4
CoPO
4
∙H
2
O/bacterial cellulose precursors under an argon atmosphere. SEM images showed that the CNFs were highly dispersed on the surfaces of Co
2
P
2
O
7
microplates. The diagonal size of the Co
2
P
2
O
7
plates ranged from 5 to 25 µm with thicknesses on a nanometer scale. Notably, with the optimal calcining temperature, the Co
2
P
2
O
7
/CNFs@600 material has higher specific micropore and mesopore surface areas than other samples, and a maximal specific capacitance of 209.9 F g
−1
, at a current density of 0.5 A g
−1
. Interestingly, CNF composite electrodes can enhance electrochemical properties, and contribute to better electrical conductivity and electron transfer. EIS measurements showed that the charge–transfer resistance (R
ct
) of the CNF composite electrodes decreased with increasing calcination temperature. Furthermore, the Co
2
P
2
O
7
/CNF electrodes exhibited higher energy and power densities than Co
2
P
2
O
7
electrodes.