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Bifunctional Electrocatalysis on Pd‐Ni Core–Shell Nanoparticles for Hydrogen Oxidation Reaction in Alkaline Medium
Author(s) -
Shviro Meital,
Polani Shlomi,
DuninBorkowski Rafal E.,
Zitoun David
Publication year - 2018
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201701666
Subject(s) - bifunctional , electrocatalyst , catalysis , materials science , alloy , nanoparticle , alkaline fuel cell , inorganic chemistry , anode , transition metal , hydrogen , metal , redox , chemical engineering , electrode , ion exchange , nanotechnology , chemistry , electrochemistry , metallurgy , organic chemistry , ion , engineering
Abstract The development of alkaline exchange membrane fuel cell (AEMFC) is limited by the sluggish reaction at the anode. Even precious group metals (PGMs) are not effective hydrogen oxidation reaction (HOR) electrocatalysts in alkaline medium. In this manuscript, the original synthesis of effective HOR electrocatalysts for AEMFC is reported. Here, the limitations of using metal‐organic precursors are described and their replacement with organometallic precursors is proposed. It is shown that completely different nanostructures can be synthesized by the organometallic route, resulting in the formation of NiPd nano‐alloy or Ni@Pd core–shell nanoparticles, instead of Pd@Ni. The presence of both Pd and Ni on the catalyst surface has a drastic effect on its HOR activity, due to a bifunctional electrocatalytic mechanism with hydrogen binding on Pd and OH binding on Ni. The highest activity is measured for NiPd nano‐alloy, whose specific activity reaches 104 mA mg Pd− 1and 1.38 mA cm Pd− 2at 0.1 V versus reversible hydrogen electrode at 298 K. These are the highest values reported so far for an NiPd catalyst. By design, the synthetic approach is generic and can be applied to any pair of metals, either PGM or other transition metals, to synthesize alloyed or core–shell electrocatalysts.