DEVELOPMENT AND CHARACTERIZATION OF TRANSITION METAL PHOSPHIDE MATERIALS FOR ELECTROCHEMICAL CAPACITORS AND OER CATALYSIS

Date

2024-5-17

Author

Köse, Kadir Özgün

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The pursuit of optimal energy utilization necessitates the exploration of new storage mechanisms and the enhancement of existing ones, driven by dwindling energy resources. Consequently, both academic and industrial efforts have intensified to refine electrochemical energy storage tools such as fuel cells, metal-air batteries, and electrochemical capacitors (EC). While electrochemical capacitors are typically recognized as low-energy high-power devices, fuel cells and metal-air batteries boast exceptional energy densities. Active material development plays a pivotal role in all these systems. Transition metal phosphides (TMPs) have emerged as a promising class of materials for above-mentioned electrochemical energy storage systems. Electrochemical capacitors primarily rely on the electrostatic accumulation of ions at electrode surfaces during charging. Scientists have struggled to increase their energy density by exploring alternative materials, including phosphides known for their high electrical conductivity. This study focuses on decorating activated carbon (AC) surfaces with TMP particles to create composite structures, aiming to boost both specific capacitance and power density. Investigating the effects of bimetallic TMP composites further expands the understanding of their potential in EC applications. The Oxygen Evolution Reaction (OER) is crucial in fuel cells and metal-air batteries, directly influencing their performance by controlling over oxygen generation at the cathode. Efficient OER catalysts are pivotal for energy conversion efficiency and durability enhancement. Transition metal phosphides demonstrate promising catalytic activity, stability, and conductivity in OER-based systems, highlighting their potential for widespread implementation in renewable energy technologies, particularly in conjunction with AC/TMP composites In this study, this promising class of materials synthesized and utilized as OER catalysts.

Subject Keywords

Electrochemical capacitors, OER catalysis, AC/TMP composite synthesis

URI

https://hdl.handle.net/11511/109859

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Graduate School of Natural and Applied Sciences, Thesis