Abstract
A ternary composite of polypyrrole (PPy), Prussian blue (PB), and graphene oxide (GO), PPyPBGO, was successfully prepared through spontaneous polymerization of pyrrole and formation of PB nanocubes on GO. The obtained nanocomposite was characterized by transmission electron microscopy, scanning electron microscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy. The results indicate that the PPy-protected PB nanocubes were well dispersed on the GO. Electrochemical testing showed a specific capacitance of 525.4Fg1 at a current density of 5Ag1 in the potential range from 0.2 to 0.6V, obtained in an electrolyte of 1molL1 KNO3 during the galvanostatic chargedischarge cycles, which is superior to the performance of binary cathode materials, including PPyPB and PPyGO nanocomposites. The as-prepared supercapacitor could retain a specific capacitance of 96% after 2000 cycles. It was confirmed that the three componentsPPy, PB, and GOled to the display of integrated electrochemical behavior and a resulting capacitor with enhanced performance. The significant enhancement in electrochemical performance of the ternary nanocomposite can be attributed to the synergistic effect of PPy-protected PB nanocubes dispersed on GO sheets with the pseudocapacitance from PB and PPy on the double-layer capacitance from GO.
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