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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.

Co2P2O7 Microplate/Bacterial Cellulose–Derived Carbon Nanofiber Composites with Enhanced Electrochemical Performance