Please use this identifier to cite or link to this item: http://cmuir.cmu.ac.th/jspui/handle/6653943832/74655
Title: Catalyst Composites of Palladium and N-Doped Carbon Quantum Dots-Decorated Silica and Reduced Graphene Oxide for Enhancement of Direct Formic Acid Fuel Cells
Authors: Surin Saipanya
Paralee Waenkaew
Suphitsara Maturost
Natthapong Pongpichayakul
Napapha Promsawan
Surasak Kuimalee
Orapim Namsar
Kamolwich Income
Budsabong Kuntalue
Suwaphid Themsirimongkon
Jaroon Jakmunee
Authors: Surin Saipanya
Paralee Waenkaew
Suphitsara Maturost
Natthapong Pongpichayakul
Napapha Promsawan
Surasak Kuimalee
Orapim Namsar
Kamolwich Income
Budsabong Kuntalue
Suwaphid Themsirimongkon
Jaroon Jakmunee
Keywords: Chemical Engineering;Chemistry
Issue Date: 31-May-2022
Abstract: Pd-based catalysts consisting of Pd nanoparticles on nitrogen-doped carbon quantum dots (N-CQDs) modified silica (SiO2) and reduced graphene oxide have been synthesized through reduction for use as catalysts for improved formic acid oxidation. The structure, morphology, chemical composition, functional groups, and porosity of the synthesized catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FT-IR) spectroscopy, Raman spectroscopy, and Brunauer-Emmett-Teller (BET) spectroscopy, respectively. Their electrocatalytic activities were also evaluated by electrochemical measurements. The differences in the average particle sizes found for Pd/N-CQDs-SiO2-rGO, Pd/N-CQDs-rGO, and Pd/rGO were 4.81, 5.56, and 6.31 nm, respectively. It was also found that the Pd/xN-CQDs-SiO2-yrGO composite catalysts (where x and y is 1 to 4) can significantly improve the activity and stability toward formic acid electrooxidation compared with Pd/rGO and commercial Pt/C. The mass activities of Pd/N-CQDs-SiO2-rGO, Pd/N-CQDs-rGO, and Pd/rGO were 951.4, 607.8, and 157.6 mA g-1, respectively, which was ca. 6-7 times compared with Pd/rGO and approximately 3-4 times compared with commercial Pt/C. With low potential for CO oxidation and high current intensity, the composites of rGO, SiO2, and N-CQDs into Pd-based catalysts improved the catalytic activity of the prepared catalyst for the oxidation of formic acid in acidic media. The value of the Tafel slope designated that the chief path of the prepared catalysts is the dehydrogenation process. These prepared catalysts exhibit promise toward the development of high-performance Pd-based electrocatalysts for formic acid oxidation.
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85131667221&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/74655
ISSN: 24701343
Appears in Collections:CMUL: Journal Articles

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