Choi, Baeck Nam, Woo-Hyun Chung, Dong Young Park, In-Su Yoo, Sung Jong Song, Jae Chun Sung, Yung-Eun 2024-01-20T07:03:12Z 2024-01-20T07:03:12Z 2021-09-05 2015-05-01 0013-4686 https://pubs.kist.re.kr/handle/201004/125463 Methanol crossover critically restricts the practical application of direct methanol fuel cells (DMFCs). To resolve this crucial difficulty from the standpoint of electrocatalysis, an electrode material having high activity for the oxygen reduction reaction and low activity for the methanol oxidation reaction compared to widely used Pt-based electrodes is needed for DMFC cathodes. In this research carbon-supported Pd-rich Pd-Pt bimetallic nanoparticle electrocatalysts with 60 wt.% metal content were prepared for this purpose by sodium borohydride reduction of metal chlorides. The physical features of the prepared nanoparticles were investigated by transmission electron microscopy, energy dispersive X-ray spectroscopy, atomic absorption spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and X-ray absorption near edge spectroscopy. Methanol tolerance was tested by means of rotating disk electrode (RDE) voltammetry using oxygen-saturated methanol-containing electrolyte solutions as the anode fuel for DMFC unit cell performance tests. In the RDE measurements, Pd-rich electrocatalysts (carbon-supported Pd19Pt1 nanoparticles) showed excellent methanol tolerance compared with Pd-free Pt electrocatalyst. When Pd19Pt1 nanoparticles were used as a DMFC cathode catalyst, unit cell performance tests showed that the i-V curves of the Pd19Pt1 electrocatalyst decreased slightly with increasing methanol concentration, while that of the Pt electrocatalyst decreased rapidly. The results in a liquid-feed DMFC unit cell test were in good agreement with the methanol tolerant characteristics identified in the RDE measurements. (C) 2015 Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD OXYGEN REDUCTION REACTION NANOCOMPOSITE NAFION MEMBRANE ELECTROOSMOTIC DRAG ALLOY CATALYSTS CARBON PLATINUM CO PERFORMANCE ELECTROOXIDATION NANOPARTICLES Enhanced Methanol Tolerance of Highly Pd rich Pd-Pt Cathode Electrocatalysts in Direct Methanol Fuel Cells Article 10.1016/j.electacta.2015.02.203 1 ELECTROCHIMICA ACTA, v.164, pp.235 - 242 ELECTROCHIMICA ACTA 164 235 242 scie scopus 000352499000029 2-s2.0-84924077997 Electrochemistry Electrochemistry Article OXYGEN REDUCTION REACTION NANOCOMPOSITE NAFION MEMBRANE ELECTROOSMOTIC DRAG ALLOY CATALYSTS CARBON PLATINUM CO PERFORMANCE ELECTROOXIDATION NANOPARTICLES Electrocatalyst Alloy Methanol tolerance Direct methanol fuel cells Oxygen reduction reaction