Dual properties of a hydrogen oxidation Ni-catalyst entrapped within a polymer promote self-defense against oxygen

Nature Communications
Alaa Alsheikh OughliOlaf Rüdiger

Abstract

The Ni(P2N2)2 catalysts are among the most efficient non-noble-metal based molecular catalysts for H2 cycling. However, these catalysts are O2 sensitive and lack long term stability under operating conditions. Here, we show that in a redox silent polymer matrix the catalyst is dispersed into two functionally different reaction layers. Close to the electrode surface is the "active" layer where the catalyst oxidizes H2 and exchanges electrons with the electrode generating a current. At the outer film boundary, insulation of the catalyst from the electrode forms a "protection" layer in which H2 is used by the catalyst to convert O2 to H2O, thereby providing the "active" layer with a barrier against O2. This simple but efficient polymer-based electrode design solves one of the biggest limitations of these otherwise very efficient catalysts enhancing its stability for catalytic H2 oxidation as well as O2 tolerance.

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Citations

Aug 15, 2018·Angewandte Chemie·Felipe ConzueloWolfgang Schuhmann
Apr 3, 2020·Chemical Society Reviews·Panagiotis Trogadas, Marc-Olivier Coppens
Aug 23, 2020·International Journal of Molecular Sciences·Qin FanMatthias Gimpel
Apr 20, 2021·Angewandte Chemie·Nicolas DuraffourgLuca Albertin
Dec 25, 2019·ACS Applied Materials & Interfaces·Kelly L MaternaLeif Hammarström
Sep 17, 2019·Journal of the American Chemical Society·Huaiguang LiNicolas Plumeré
Jul 19, 2018·Journal of the American Chemical Society·Jeffrey W SlaterHannah S Shafaat
Jan 9, 2020·ACS Applied Materials & Interfaces·Bertrand ReuillardVincent Artero
Oct 15, 2020·Chemical Reviews·Hui ChenShelley D Minteer

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Methods Mentioned

BETA
nuclear magnetic resonance
NMR

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