MnO₂ Nanosheets Grown on Multichannel Carbon Nanofibers Containing Amorphous Cobalt Oxide as a Flexible Electrode for Supercapacitors

Abstract

In this study, MnO2 nanosheets grown on the multichannel carbon nanofibers containing amorphous cobalt oxide (CoMCNFs@MnO2) are prepared via electrospinning technology followed by carbonization and a facile chemical bath deposition process. The as-obtained CoMCNFs@MnO2 shows flexible features, which could serve as freestanding electrodes applied in supercapacitors. As a result, CoMCNFs@MnO2-2.5 exhibits the specific capacitance of 265 F g–1 at 0.5 A g–1, which surpasses those of their individual counterparts (135 and 143 F g–1 at 0.5 A g–1 for MCNFs@MnO2 and CoMCNFs, respectively). Moreover, After 10000 cycles, the specific capacitance of CoMCNFs@MnO2-2.5 also maintained 98.7%. Most importantly, the asymmetric supercapacitor (ASC) is assembled with CoMCNFs@MnO2-2.5 and the electrospinning carbon nanofibers (CNFs), which exhibit a high E of 19.27 Wh kg–1 with a P of 217.51 W kg–1 at 0.3 A g–1 and outstanding cycle ability of capacitance retention of 94.9% after 10000 cycles. This work paves a way to develop high-performance wearable asymmetric supercapacitors.

CoMnO2-Decorated Polyimide-Based Carbon Fiber Electrodes for Wire-Type Asymmetric Supercapacitor Applications

“…43-1003, respectively. These results demonstrated the successful coating of CoMnO 2 with amorphous phase onto the PICF [ 36 ].…”

A smart flexible supercapacitor enabled by a transparent electrochromic electrode composed of W18O49 nanowires/rGO composite films

“…However, the stability of electrodes is a major issue and stability is always desired to deliver high energy density. 20,21 As compared to these pseudocapacitive materials tungsten oxide (WO x ) nanostructures have been reported for charge storage via ion intercalation into the crystalline network with no compromise on structural integrity. 22,23 Among the various WO x nanostructures, the monoclinic W 18 O 49 nanostructure is recognized as a viable electrode material for the future energy storage device, due to its availability of oxygen-vacancies for electrical conductivity.…”

Calcination Strategy for Scalable Synthesis of Pithecellobium-Type Hierarchical Dual-Phase Nanostructured CuxO to Columnar Self-Assembled CuO and Its Electrochemical Performances

“…The rational design of energy storage devices or platforms that shows excellent performance greatly depends on the electrode materials. Therefore, top priority has given to explore widely acceptable electrode materials for the development of cost-effective, safe, and high-capacitive, multidimensional mode of energy storage devices, which is desperately warranted for sustainable and green technology. , Among all the energy storage devices, the electrochemical supercapacitors, either electrical double-layer capacitors (EDLCs) or pseudocapacitors are promising devices in the field of energy storage as they have a high power density, energy density, a rapid charge–discharge rate, and an excellent cyclic stability. − For these advantages, emphasis has given to pure/binary or ternary oxides based on transition metals as one of the best candidate material. − In this context, mostly ongoing R&D is focused on engineering an effective preparation method for manipulating surface activities, the crystal structure, and the morphology to obtain optimal electrochemical properties. − Again, scalable synthesis and wide availability of the precursor metal ions along with their consistency in the supply chain are the major challenges for establishing the future emerging technology. Among them, copper-based oxides are significantly addressing most of the issues because of their worldwide available resources, being environmentally friendly, and possessing manipulative specific capacitance. − To achieve its theoretical capacity, the pseudocapacitance of CuO is 1800 F/g and that of Cu 2 O is up to 2247 F/g .…”