Browsing by Author "Erunal, Ebru"

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Activity and Structure Analysis of Highly Functional Ru-Pt-Ni/AC Nanocatalysts for Efficient Glucose Electrooxidation
(Springer, 2025) Ulas, Berdan; Yilmaz, Yonca; Demir Kivrak, Hilal; Najri, Bassam A.; Erunal, Ebru
A promising Ru-Pt-Ni/AC catalyst for direct glucose fuel cells was developed via the supercritical carbon dioxide deposition method which enabled a uniform distribution of metals, with an average particle size of 3.85 nm. The electrocatalytic activity and stability of the nanocatalysts for glucose electrooxidation were evaluated using chronoamperometry (CA), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) in alkaline media. Under these conditions, the catalyst exhibited a notably high specific activity of 3.98 mAcm(-)(2) for glucose electrooxidation, significantly surpassing the performance of conventional catalysts. Electrochemical impedance spectroscopy further confirmed the kinetic improvement, showing a clear reduction in charge transfer resistance with increasing potential. Complementary DFT calculations supported the experimental findings by evidencing modifications in surface electrophilicity and their role in activity enhancement.
Development of Effective Bimetallic Electrocatalysts for Glucose Electrooxidation
(Electrochemical Soc inc, 2022) Ulas, Berdan; Yilmaz, Yonca; Kivrak, Hilal; Erunal, Ebru
Vulcan XC-72 supported PdCo and PtCo electrocatalysts were synthesized via supercritical deposition method and designed as anode catalyst for direct glucose fuel cells (DGFCs). As-prepared electrocatalysts were characterized by using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), inductively coupled plasma-mass spectrometer (ICP-MS), scanning electron microscopy energy-dispersive X-ray spectroscopy (SEM-EDX), and transmission electron microscopy (TEM) while electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and chronoamperometry (CA) methods were used for the electrochemical characterization of PdCo/Vulcan XC-72 and PtCo/Vulcan XC-72 catalysts. PdCo/Vulcan XC-72 anode catalyst showed higher electrocatalytic activity for glucose electrooxidation than PtCo/Vulcan XC-72. In addition, chronoamperometry results showed that PdCo/Vulcan XC-72 possessed better stability within 1000 s than PtCo/Vulcan XC-72. The improvement in electrocatalytic activity and stability has been attributed to the alteration of the electronic properties of Pd with the addition of Co. The PdCo/Vulcan XC-72 catalyst is a good candidate for use as an anode catalyst in DGFCs. (C) 2022 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.