Rising global warming concern demands the need for a rapid transition to renewable energy sources. The intermittent nature of these sources emphasizes the requirement of developing highly efficient electrochemical energy storage devices like supercapacitors and batteries. Supercapacitors are at the forefront of powering various devices spanning from electric cars to aircraft. Here, we have engineered the electrode material properties for developing supercapacitors with high capacitance, energy density and cycle life. Among the electrode materials, we have focused on improving the energy storage performance of 2D materials like graphene oxide (GO) and tungsten disulfide (WS2), in addition to metal oxides such as manganese oxide and molybdenum oxide. A simple electrophoretic deposition technique is developed to vertically attach and align 2D materials like GO sheets on the carbon fibers to achieve unprecedented 100,000 charge-discharge cycles. The flexible nature displayed by the manufactured device demonstrated its application for powering next-generation wearable electronics. An all 2D asymmetric supercapacitor developed by combining GO and WS2 electrodes delivered an output voltage beyond the thermodynamic breakdown potential of the aqueous electrolyte. Investigating the structural evolution of these 2D materials using tools such as kelvin probe force microscope (KPFM) and Raman spectroscopy provided an understanding of the surface level chemical and structural changes undergone by the electrodes during cycling. The KPFM is also utilized to successfully engineer the electrode work function to enhance the voltage and energy density in a supercapacitor. This work opened up a new route to obtaining high energy density from supercapacitors which are already exhibiting high power density and cycle life.
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Doctor of Philosophy (Ph.D.)
College of Engineering and Computer Science
Materials Science and Engineering
Materials Science & Engineering
Length of Campus-only Access
Doctoral Dissertation (Open Access)
Sambath Kumar, Kowsik, "Engineering the Electrode Properties for Developing High Performance Supercapacitors" (2022). Electronic Theses and Dissertations, 2020-. 1281.