Chemical-Dealloying-Derived PtPdPb-Based Multimetallic Nanoparticles: Dimethyl Ether Electrocatalysis and Fuel Cell Application

Medhanie Gebremedhin Gebru, Palaniappan Subramanian, Petr Bělský, Radhey Shyam Yadav, Itay Pitussi, Sarath Sasi, Rostislav Medlín, Jan Minar, Peter Švec, Haya Kornweitz, Alex Schechter

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, we report a novel multimetallic nanoparticle catalyst composed of Pt, Pd, and Pb and its electrochemical activity toward dimethyl ether (DME) oxidation in liquid electrolyte and polymer electrolyte fuel cells. Chemical dealloying of the catalyst with the lowest platinum-group metal (PGM) content, Pt2PdPb2/C, was conducted using HNO3 to tune the catalyst activity. Comprehensive characterization of the chemical-dealloying-derived catalyst nanoparticles unambiguously showed that the acid treatment removed 50% Pb from the nanoparticles with an insignificant effect on the PGM metals and led to the formation of smaller-sized nanoparticles. Electrochemical studies showed that Pb dissolution led to structural changes in the original catalysts. Chemical-dealloying-derived catalyst nanoparticles made of multiple phases (Pt, Pt3Pb, PtPb) provided one of the highest PGM-normalized power densities of 118 mW mgPGM-1 in a single direct DME fuel cell operated at low anode catalyst loading (1 mgPGM cm-2) at 70 °C. A possible DME oxidation pathway for these multimetallic catalysts was proposed based on an online mass spectrometry study and the analysis of the reaction products.

Original languageEnglish
JournalACS applied materials & interfaces
Early online date30 Nov 2023
DOIs
StateE-pub ahead of print - 30 Nov 2023
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2023 The Authors. Published by American Chemical Society

Funding

A.S. and M.G.G. would like to acknowledge Ariel University and Israel National Research Center for Electrochemical Propulsion (INREP) for financially supporting this research. R.S.Y., I.P., and H.K. acknowledge the Ariel HPC Center at Ariel University for providing the computing resources. P.S., S.S., R.M., and J.M. would like to acknowledge the support of the Quantum materials for applications in sustainable technologies (QM4ST), reg. no. CZ.02.01.01/00/22_008/0004572 by Programme Johannes Amos Comenius, call Excellent Research at the New Technologies Research Center, University of West Bohemia, Pilsen. P.Š. acknowledges the support from projects APVV-19-0369 and VEGA 2/0144/21.

FundersFunder number
Ariel University and Israel National Research Center for Electrochemical Propulsion
Vedecká Grantová Agentúra MŠVVaŠ SR a SAV2/0144/21
Israel National Research Center for Electrochemical PropulsionAPVV-19-0369

    Keywords

    • chemical dealloying
    • dimethyl ether
    • fuel cell
    • online mass spectrometry
    • oxidation pathway

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