Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
The elemental cocktail effect of high-entropy spinel oxides on the electrocatalytic performance of zinc-air battery cathode
Date
2023-07-25
Author
Erdil, Tuncay
Toparlı, Çiğdem
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
6
views
0
downloads
Cite This
Metal-air batteries are heavily dependent on oxygen electrochemical reactions. The oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR) are the key reactions to be catalyzed for improving the energy solution systems, e.g., regenerative fuel cells, water electrolyzers, and zinc-air batteries. Especially OER is the bottleneck of the overall water-splitting reaction due to the sluggish four- electron transfer mechanism.[1-3] Therefore, it is a requirement to catalyze this reaction and upshift the reaction kinetics. However, commercially used iridium oxide (IrO2) and ruthenium oxide (RuO2) have poor long-term stabilities and are expensive and scarce.[4] Thus, new, inexpensive, and promising bifunctional electrocatalysts must be designed. High entropy oxides (HEOs) are a new class of promising electrocatalysts due to their unique single-phase and highly disordered structure related to configurational entropy. HEOs are composed of four or five elements on one side with a single-phased crystal structure. The highly disordered structure and high entropy of these compounds cause numerous defective sites and deficiencies, such as oxygen deficiencies; these deficiencies and defective sites act as active sites to catalyze the OER and ORR[5]. In this work, the tetrahedral site of spinel Fe3O4 was changed with different elemental compositions, and the cocktail effect of these elements on the electrocatalytic performance was investigated. Two different types of high entropy spinel oxides (HESOs) were synthesized via the modified Sol-Gel Pechini method; these HESOs are (MgCoCuNiZn)Fe2O4 and (MnCoCrNiFe)Fe2O4. The crystal structure of the HESOs was confirmed by X-Ray diffraction (XRD), and the morphology of the samples was observed via scanning electron microscope (SEM). Also, the effect of chemical composition and valence states was determined by X-ray photoelectron spectroscopy (XPS). Electrochemical tests were conducted using a rotating disk electrode (RDE) under an alkaline environment. Afterward, these HESOs were tested as cathodes for rechargeable zinc-air battery by incorporating a zinc-sheet anode and 6 M KOH + Zn(OAc)2 electrolyte in the homemade zinc-air battery cell.
URI
https://hdl.handle.net/11511/111656
Conference Name
The Seventh International Symposium on Materials for Energy Storage and Conversion (mESC-IS 2023)
Collections
Department of Metallurgical and Materials Engineering, Conference / Seminar
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
T. Erdil and Ç. Toparlı, “The elemental cocktail effect of high-entropy spinel oxides on the electrocatalytic performance of zinc-air battery cathode,” presented at the The Seventh International Symposium on Materials for Energy Storage and Conversion (mESC-IS 2023), Muğla, Türkiye, 2023, Accessed: 00, 2024. [Online]. Available: https://hdl.handle.net/11511/111656.