Activity–Stability Relationship in Compositionally Tuned Magnetron Co-Sputtered Bimetallic Catalysts for Proton Exchange Membrane Fuel Cells

IF 2.6 4区工程技术 Q3 ELECTROCHEMISTRY Fuel Cells Pub Date : 2024-12-27 DOI:10.1002/fuce.202400095

Martin Orság, Athira Lekshmi Mohandas Sandhya, Xianxian Xie, Jan Kučera, Miquel Gamon Rodriguez, Yurii Yakovlev, Milan Dopita, Iva Matolínová, Ivan Khalakhan

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Abstract

In the present study, magnetron-sputtered Pt_xM₁₀₀₋_x (M = Co, Cu, and Y; x = 25, 50, 75, and 100) bimetallic alloys were investigated as PEMFC cathodes. Accurate composition and layer thickness control enabled a systematic study of the correlation between the alloy composition, its activity, and stability. The catalysts underwent thorough characterization, employing a diverse portfolio of characterization techniques such as scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and cyclic voltammetry. The activity of all investigated alloys was tested directly in a fuel cell device, whereas stability was assessed through potentiodynamic cycling in a half-cell. The activity–stability index, considering experimental results for both activity and stability, was calculated and compared for all investigated catalysts. All alloys exhibited a volcano-type trend in the activity–stability index as a function of the concentration of the alloying element with maxima observed for Pt₅₀Co₅₀, Pt₅₀Cu₅₀, and Pt₇₅Y₂₅ for respective alloys, surpassing that of monometallic platinum. Overall, Pt₅₀Co₅₀ emerged as a catalyst with the highest activity–stability ratio.

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来源期刊

Fuel Cells 工程技术-电化学

CiteScore

5.80

自引率

3.60%

发文量

审稿时长

3.7 months

期刊介绍： This journal is only available online from 2011 onwards. Fuel Cells — From Fundamentals to Systems publishes on all aspects of fuel cells, ranging from their molecular basis to their applications in systems such as power plants, road vehicles and power sources in portables. Fuel Cells is a platform for scientific exchange in a diverse interdisciplinary field. All related work in -chemistry- materials science- physics- chemical engineering- electrical engineering- mechanical engineering- is included. Fuel Cells—From Fundamentals to Systems has an International Editorial Board and Editorial Advisory Board, with each Editor being a renowned expert representing a key discipline in the field from either a distinguished academic institution or one of the globally leading companies. Fuel Cells—From Fundamentals to Systems is designed to meet the needs of scientists and engineers who are actively working in the field. Until now, information on materials, stack technology and system approaches has been dispersed over a number of traditional scientific journals dedicated to classical disciplines such as electrochemistry, materials science or power technology. Fuel Cells—From Fundamentals to Systems concentrates on the publication of peer-reviewed original research papers and reviews.