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Syafei, Hilman
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Biochemistry, Genetics & Molecular Biology Chemistry Materials Science & Nanotechnology

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Journal : Chemistry and Materials

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Square-Wave Pulse Deposition of Pt Nanoparticles for Ethanol Electrooxidation Syafei, Devi Indrawati; Syafei, Hilman
Chemistry and Materials Vol. 3 No. 1 (2024)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v3i1.70

Abstract

Platinum (Pt) is often used as an electrocatalyst in the electrooxidation of ethanol. There have been many attempts to improve the catalytic properties of platinum-based catalysts to achieve satisfactory results. The solutions are manipulating the size and shape of Pt. In this study, Pt will be deposited using the square wave pulse deposition method at upper potential variations. The Pt samples were characterized by scanning electron microscopy (SEM), X-ray diffraction, energy dispersive X-ray, and electrochemical impedance spectroscopy. The results of SEM show that the morphology of Pt at potentials of 0.3 V, 0.5 V, and 1.0 V produces a dendritic nanothorn morphology, while 1.25 V and 1.50 V produce a nanoleaf morphology. The lowest charge transfer resistance value is at Pt1.0V with the smallest size. The highest yield of ethanol electrooxidation was at Pt1.0V reaching 8.82 mA/cm2.
PtSnNi Trimetallic and Their Catalytic Activities in Ethanol Electrooxidation Syafei, Hilman; Raudhatul Hadawiyah; Mulya Muhammad Nur
Chemistry and Materials Vol. 4 No. 1 (2025)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v4i1.90

Abstract

The declining availability of fossil fuels and their environmental impacts have driven the search for cleaner, renewable energy alternatives, such as direct ethanol fuel cells (DEFCs). However, the widespread application of DEFCs faces challenges due to the complex kinetics of ethanol electrooxidation, necessitating the development of effective catalysts. Platinum (Pt) is widely regarded as the most effective catalyst for this process. However, its use is hindered by high costs and susceptibility to poisoning by intermediates formed during the ethanol electrooxidation reaction. To address these issues, the addition of Sn and Ni to the Pt catalyst is expected to enhance its performance. In this study, PtSnNi trimetallics were synthesized using the electrodeposition method. The samples were then characterized using scanning electron microscopy-energy dispersive spectroscopy (SEM-EDX) and electrochemical tests to evaluate their catalytic activity and stability. The SEM image reveals that PtSnNi2 has the smallest particle size compared to other PtSnNi samples. Additionally, the results indicate that PtSnNi2, with a composition of 73% Pt, 26% Sn, and 1% Ni, exhibits the optimal electrolyte concentration, leading to the highest catalytic activity and stability. This is evidenced by the lowest Rct, lowest Ib/If ratio, and highest current density in the ethanol oxidation reaction.
Co-Authors Mulya Muhammad Nur Raudhatul Hadawiyah Syafei, Devi Indrawati