Cobalt oxide nanofibers elevate supercapattery capabilities

The combination of a high surface area of conductive carbon nanofibers (CNFs) consolidated with good redox property of cobalt oxide (Co3O4) resulted in a high-performance positive electrode for supercapattery. In this study, the composite was fabricated through electrospinning and carbonization of CNFs followed by electrodeposition of Co3O4. The morphology of the composite showed crosslinked CNFs decorated with randomly distributed Co3O4 nanoparticles after electrodeposition. The electrochemical evaluation of CNFs/Co3O4 demonstrated an outstanding specific capacity of 1516.97 C g−1. The outstanding supercapattery performance of CNFs/Co3O4 can be attributed to the synergistic effect arising from the abundant Faradaic reactions of Co3O4 combined with the high surface area and excellent conductivity of the CNFs. The carbon nanofibers/cobalt oxide//N-doped graphene-based supercapattery device exhibited specific energy and power values of 10.63 Wh kg−1 and 343.16 W kg−1, respectively, while maintaining 76.3% capacity retention after 3000 cycles. These findings demonstrate the potential of CNFs/Co3O4 composites as promising electrode architectures for supercapatteries.

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