Date of Award
2024-12-01
Degree Name
Master of Science
Department
Mechanical Engineering
Advisor(s)
Ramana Chintalapalle V
Abstract
Designing materials having novel multi metal oxide electrodes with controlled structure and composition is a critical technological challenge for high performance supercapacitor applications. Quaternary metal oxides have attracted considerable attention in this field, where many methods have been used to improve their performance. In the present work, the nickel cobalt molybdenum copper oxide (NCMCuO2) has been synthesized using a hydrothermal method. The effect of different concentrations of Cu doping (0.5%,1.0% and 2.0%) on the NCM frame and structural and electrochemical properties of the quaternary metal oxide (NCMCuO2) are studied thoroughly. The XRD pattern of synthesized NCMCuO2 exhibited predominant (002) orientation confirms the successful formation of NCMCuO2 phase with an average crystallite size of 30 nm. NCMCu1.0O2 demonstrates vertically aligned nano tubes with an average tube size of 90 nm and a length of 3 µm are observed from both FESEM and TEM analyses. With unique morphology of the vertical aligned nanotubes, the NCMCu1.0O2 contains reliable 3D-conductive channels that help rapid transport throughout the electrode as well as synergistic effects. The BET analyses reveal that the NCMCu0.1O2 provides a high surface area of 42.71 m2g-1 and high mesoporosity with nanotube morphology. The XPS analysis reveals that all Ni, Co, Mo, Cu and O elements existence and maintain their chemical homogeneity in NCMCu1.0O2. Chemical-composition tuning, and optimization yields NCMCu1.0O2 to deliver the superior specific capacitance of 2510 Fg-1 at 1 Ag-1 and retain ~95% capacitance after 5000 cycles. The NCMCu1.0O2//AC asymmetric supercapacitor (ASC) device demonstrates excellent energy density and power density values of 110.93 Wh kg-1 and 1279.84 W kg-1, respectively. The breakthrough stems from the deliberate incorporation of multiple metal oxides, meticulously tailored in their compositions. Such an approach heralds a paradigm shift in the quest for superior energy storage solutions, paving the way for transformative developments in the realm of high-performance energy storage devices.
Language
en
Provenance
Recieved from ProQuest
Copyright Date
2024-12-01
File Size
70 p.
File Format
application/pdf
Rights Holder
Ricardo Herrera Aguirre
Recommended Citation
Herrera Aguirre, Ricardo, "Vertically Aligned Nickel Cobalt Molybdenum Copper oxide Nanotubes for High performance Asymmetric Supercapacitors" (2024). Open Access Theses & Dissertations. 4256.
https://scholarworks.utep.edu/open_etd/4256