DIRECT EVIDENCE FOR THE BIFUNCTIONAL HYDROGEN OXIDATION REACTION ELECTROCATALYSIS IN ALKALINE MEDIUM
2Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences, Budapest, Hungary
3Department of Chemistry and Chemical Biology, Northeastern University, Boston, Massachusetts, USA
Investigation of the hydrogen oxidation reaction (HOR) in alkaline media has been pursued in the past few years side by side with the development of Alkaline exchange membrane fuel cells (AEMFCs). We have developed a family of platinum-free bimetallic catalysts.[1,2] The catalysts are synthesized through novel synthetic approaches to allow the control at the nanoscale of two phases, one responsible for the hydrogen binding and the other one for hydroxide binding. [3]
A detailed investigation of the catalysts by advanced electron microscopies show the interconnections between the two phases: Pd metal and NiOOH. The in-situ study of the catalysts has been carried on by operando X-Ray absorption spectroscopy collected on a synchrotron light source at the K-edge of Ni and Pd.
This study emphasizes the importance of tuning the interface of the electrocatalyst and opens way to improve the activity of HOR catalysts in alkaline medium.
[1] Pd/Ni Synergestic Activity for Hydrogen Oxidation Reaction in Alkaline Conditions Istvan Bakos, Andras Paszternak, David Zitoun Electrochimica Acta, 2015, 176, 1074-1082
[2] Palladium/Nickel Bifunctional Electrocatalyst for Hydrogen Oxidation Reaction in Alkaline Membrane Fuel Cell Masha Alesker, Miles Page, Meital Shviro, Gregory Gershinsky, Yair Paska, Dario Dekel, David Zitoun Journal of Power Sources 2016, 304, 332-339
[3] Method for fabricating multi-metallic hydrogen oxidation electrocatalyst materials, Provisional appl. no.: 62/541,810 David Zitoun, Masha Alesker, Meital Shviro
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