Ahmet Muhtar Önal

Department of Chemistry
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Side chain effect on the electrochemical and optical properties of thieno[3,4-c]pyrrole-4,6-dione based donor-acceptor donor type monomers and polymers
Çakal, Deniz; Demir Arabacı, Elif; Yıldırım, Erol; CİHANER, ATİLLA; Önal, Ahmet Muhtar (2022-09-01)
In organic pi-conjugated materials, side chains play great roles that impact far beyond solubility. In this work, we mainly focused on the synthesis of new donor-acceptor-donor (D-A-D) type conjugated monomers and their co...
The Utilization of Iridium Nanoparticles Impregnated on Metal Oxides (Ceria, Titania, and Zirconia) with a Simple and Ecologically Safe Synthesis Approach in Oxygen Evolution Reactions
Akbayrak, Merve; Önal, Ahmet Muhtar (2022-07-01)
© 2022 The Electrochemical Society (“ECS”). Published on behalf of ECS by IOP Publishing Limited.Oxygen evolution reactions (OERs) have sluggish kinetics, which limits the hydrogen generation from the electrolysis of water...
Synthesis and electropolymerization of donor-acceptor-donor type monomers based on azobenzene-substituted thieno[3,4-c]pyrrole-4,6-dione acceptors
Çakal, Deniz; Önal, Ahmet Muhtar (2021-12-01)
By using donor-acceptor-donor approach, a new series of photo responsive and electroactive trimeric monomers, namely (E)-5-(4-(phenyldiazenyl)phenyl)-1,3-di(thiophen-2-yl)-4H-thieno[3,4- c]pyrrole-4,6(5H)-dione (T-2-AB ), ...
Polyhedral oligomeric silsesquioxanes appended conjugated soluble polymers based on thieno[3,4-c]pyrrole-4,6,dione acceptor unit
Çakal, Deniz; Önal, Ahmet Muhtar (2021-05-01)
A series of new donor-acceptor-donor type fluorescent molecules incorporating thieno[3,4-c]pyrrole-4,6-dione (TPD) as the acceptor unit were synthesized. TPD acceptor unit was modified with polyhedral oligomeric silsesquio...
Effect of fluorine substituted benzothiadiazole on electro-optical properties of donor-acceptor-donor type monomers and their polymers
Çakal, Deniz; Önal, Ahmet Muhtar (Elsevier BV, 2020-11-01)
A series of trimeric monomers bearing thiophene donor units and fluorinated analogues of benzothiadiazole acceptor units was synthesized via donor-acceptor-donor approach and polymerized electrochemically in order to inves...
High Durability and Electrocatalytic Activity Toward Hydrogen Evolution Reaction with Ultralow Rhodium Loading on Titania
Akbayrak, Merve; Önal, Ahmet Muhtar (2020-10-01)
Herein, we report the synthesis of titania supported Rh(0) nanoparticles (Rh0/TiO2) as electrocatalyst for hydrogen evolution reaction (HER) in acidic medium. Rhodium nanoparticles with an average particle size of 2.54 nm ...
Effect of the donor units on the properties of fluorinated acceptor based systems
Önal, Ahmet Muhtar; Akdağ, Akın; Çakal, Deniz (Elsevier BV, 2020-10-01)
A new series of monomers in the donor-acceptor-donor array, namely 5-fluoro-4,7-di(furan-2-yl)benzo[c][1,2,5]thiadiazole (F2BT-F), and 5-fluoro-4,7-di(selenophen-2-yl)benzo[c][1,2,5] thiadiazole (S2BT-F), bearing 5-fluorob...
Binder- free iridium based electrocatalysts: Facile preparation, high activity and outstanding stability for hydrogen evolution reaction in acidic medium
Akbayrak, Merve; Önal, Ahmet Muhtar (Elsevier BV, 2020-07-01)
Herein, we develop various iridium based catalysts using titania, zirconia and ceria as asupporting material(Ir/MO2; M=Ce, Ti, Zr) for hydrogen evolution reaction (HER). To investigate their electrocatalytic activities, gl...
Ceria Supported Nickel(0) Nanoparticles: A Highly Active and Low Cost Electrocatalyst for Hydrogen Evolution Reaction
Demir Arabacı, Elif; Önal, Ahmet Muhtar; Özkar, Saim (2020-06-01)
Herein, we report the development of a nickel-based catalyst obtained by reduction of Ni(2+)ions on the surface of ceria nanopowder using aqueous solution of NaBH4. The catalyst was characterized by X-ray diffraction (XRD)...
Cross-exchange of donor units in donor-acceptor-donor type conjugated molecules: Effect of symmetrical and unsymmetrical linkage on the electrochemical and optical properties
Eroglu, Deniz; ERGÜN, EMİNE GÜL CANSU; Önal, Ahmet Muhtar (Elsevier BV, 2020-05-08)
A series of donor-acceptor-donor type molecules were synthesized using carbazole (C) and thiophene (T) as donor units. The donors were connected symmetrically and unsymmetrically to the acceptor unit of benzothiadiazole (B...
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