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Palladium–Ceria Catalysts with Enhanced Alkaline Hydrogen Oxidation Activity for Anion Exchange Membrane Fuel Cells

Bellini, Marco, Pagliaro, Maria V., Lenarda, Anna, Fornasiero, Paolo, Marelli, Marcello, Evangelisti, Claudio, Innocenti, Massimo, Jia, Qingying, Mukerjee, Sanjeev, Jankovic, Jasna , Wang, Lianqin, Varcoe, John R., Krishnamurthy, Chethana B., Grinberg, Ilya, Davydova, Elena, Dekel, Dario R., Miller, Hamish A. and Vizza, Francesco (2019) Palladium–Ceria Catalysts with Enhanced Alkaline Hydrogen Oxidation Activity for Anion Exchange Membrane Fuel Cells ACS Applied Energy Materials, 2 (7). pp. 4999-5008.

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Abstract

Anion exchange membrane fuel cells (AEMFCs) offer several important advantages with respect to proton exchange membrane fuel cells, including the possibility of avoiding the use of platinum catalysts to help overcome the high cost of fuel cell systems. Despite such potential benefits, the slow kinetics of the hydrogen oxidation reaction (HOR) in alkaline media and limitations in performance stability (because of the degradation of the anion conducting polymer electrolyte components) have generally impeded AEMFC development. Replacing Pt with an active but more sustainable HOR catalyst is a key objective. Herein, we report the synthesis of a Pd–CeO2/C catalyst with engineered Pd-to-CeO2 interfacial contact. The optimized Pd–CeO2 interfacial contact affords an increased HOR activity leading to ˃1.4 W cm–2 peak power densities in AEMFC tests. This is the only Pt-free HOR catalyst yet reported that matches state-of-the-art AEMFC power performances (˃1 W cm–2). Density functional theory calculations suggest that the exceptional HOR activity is attributable to a weakening of the hydrogen binding energy through the interaction of Pd atoms with the oxygen atoms of CeO2. This interaction is facilitated by a structure that consists of oxidized Pd atoms coordinated by four CeO2 oxygen atoms, confirmed by X-ray absorption spectroscopy.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
NameEmailORCID
Bellini, Marco
Pagliaro, Maria V.
Lenarda, Anna
Fornasiero, Paolo
Marelli, Marcello
Evangelisti, Claudio
Innocenti, Massimo
Jia, Qingying
Mukerjee, Sanjeev
Jankovic, Jasna
Wang, Lianqinlianqin.wang@surrey.ac.uk
Varcoe, John R.J.Varcoe@surrey.ac.uk
Krishnamurthy, Chethana B.
Grinberg, Ilya
Davydova, Elena
Dekel, Dario R.
Miller, Hamish A.
Vizza, Francesco
Date : 22 July 2019
Funders : European Union's Horizon 2020, Engineering and Physical Sciences Research Council (EPSRC), Royal Society
DOI : 10.1021/acsaem.9b00657
Copyright Disclaimer : Copyright © 2019 American Chemical Society
Uncontrolled Keywords : Fuel cells; Platinum free; Anion exchange membrane; Palladium; Ceria
Depositing User : Clive Harris
Date Deposited : 07 Aug 2019 07:23
Last Modified : 07 Aug 2019 07:23
URI: http://epubs.surrey.ac.uk/id/eprint/852360

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