DEVELOPMENT AND CHARACTERIZATION OF SULFIDE BASED ACTIVE MATERIALS FOR ELECTROCHEMICAL APPLICATIONS

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SavaşUygur_Cansu_Ph.D.Thesis.pdf

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2022-6-20

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SAVAŞ UYGUR, CANSU

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Next-generation electrochemical applications have faced a challenge to be improved in terms of performance with the increasing demand for new technologies. Although oxide-based active materials are widely used material groups in the electrochemical applications, including batteries, electrolyzers, capacitors and electrochemical catalysis, research in nitride/ phosphide/ boride/ sulfide-based active materials are increasing trend topic to overcome the shortcomings of the metal oxide groups. Sulfide-based active materials show remarkable capacitive and electrocatalytic behavior, which has the potential to be replaced with their commercial counterparts. However, the reaction mechanism behind the capacitive and electrocatalytic performance of certain parts of this group either has not been understood completely or even studied/published. In this study, sulfide-based active materials and/or their composites were synthesized and compounds that were not reported in the literature before were used to improve the electrochemical behavior, including reaction mechanisms and performance. Structural and morphological characterization of synthesized active materials was carried out by using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and particle size analysis (PSA). Energy dispersive spectroscopy (EDS) and Rietveld analysis were used for the chemical analysis. Electrochemical characterization was performed by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and constant current/voltage tests focusing on the capacitive and electrocatalytic performance of the active materials.

Subject Keywords

Microwave-Assisted Synthesis; Metal Sulfides; Oxygen Evolution Reaction; Electrocatalysts

URI

https://hdl.handle.net/11511/98092

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

C. SAVAŞ UYGUR, “DEVELOPMENT AND CHARACTERIZATION OF SULFIDE BASED ACTIVE MATERIALS FOR ELECTROCHEMICAL APPLICATIONS,” Ph.D. - Doctoral Program, Middle East Technical University, 2022.