Binary d-MnO2/Co3O4 metal oxides wrapped on super-aligned electrospun carbon nanofibers: energy storage and electrocatalytic studies
- UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
- Kokougan Allado Yawovi (Creator)
- Institution
- The University of North Carolina at Greensboro (UNCG )
- Web Site: http://library.uncg.edu/
- Advisor
- Wei Jianjun
Abstract: This work depicts the design of a binary metal oxide-based electrode for the best performance in energy storage and electrocatalytic system. An electrodeposition procedure has been used to obtain uniform binary metal oxide films. The morphology of the binary metal oxide was examined by Scanning electron microscopy (SEM). Energy Dispersive X-ray (EDX) spectroscopy, X-ray photoelectron spectroscopy (XPS), and X-ray diffraction spectroscopy (XRD) were performed to study the elemental composition of the composite samples. Cyclic voltammetry, electrochemical impedance spectroscopy (EIS), and galvanostatic charge/discharging techniques were used to identify the binary metal oxide on super-aligned electrospun carbon nanofibers (SA-ECNFs) for the performance in energy storage as supercapacitor electrode and a better understanding of the reaction mechanism have been achieved. Cyclic voltammetry was used to study the electrocatalytic properties of the binary metal oxides on SA-ECNFs for oxygen reduction reaction (ORR) catalytic activity. The characterization results suggest that the synthesized binary metal oxides were uniformly dispersed around the fibers to form a 3D nanostructure with a thickness of ~2.3 µm. The electrochemical study shows the binary composite with a satisfactory capacity retention of 82% over 1400 cycles and an electrochemical activity with a capacitance of 728 F/g. The galvanic charge discharge performance of the binary metal oxides also shows the binary metal oxide electrode with the 726 F/g for capacitance, 64.5 Wh/kg for energy density and 1276 W/kg for power density at current density of 2 A/g. Results from the electrocatalytic properties studies show that the sharp synergistic effect between the three components Co3O4, MnO2 and SA-AECNFs increases the number of electron pathway of ORR at the catalytic system. The outcomes in this dissertation work presents some advances in knowledge of the synergistical compatibility within coupled metal oxides and carbonaceous material which should accelerate the development and design of the next generation high performance energy storage devices such as supercapacitors and fuel cells. [This abstract has been edited to remove characters that will not display in this system. Please see the PDF for the full abstract.]
Binary d-MnO2/Co3O4 metal oxides wrapped on super-aligned electrospun carbon nanofibers: energy storage and electrocatalytic studies
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Created on 5/1/2021
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Additional Information
- Publication
- Dissertation
- Language: English
- Date: 2021
- Keywords
- Binary metal oxide-based electrode, Carbon nanofibers
- Subjects
- Carbon nanofibers
- Electrodes, Oxide
- Electrocatalysis
- Supercapacitors
- Energy storage