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Surface oxidation of Ni-cermet electrodes by CO_(2) and H_(2)O and how to moderate it

Journal of Energy Chemistry 2022年第4期31卷 300-308页

作者： Dingkai Chen Mathias Barreau Thierry Dintzer sylwia turczyniak-surdacka Fabrice Bournel Jean-Jacques Gallet Spyridon Zafeiratos Institut de Chimie et Procédés pour l’Energie l’Environnement et la SantéUMR 7515 CNRS-UdS25 Rue Becquerel67087 StrasbourgFrance Faculty of Chemistry Biological and Chemical Research CentreUniversity of WarsawŻwirki i Wigury 10102-089 WarsawPoland Faculty of Chemistry University of WarsawPasteura 102-093Poland Laboratoire de Chimie Physique-Matière et Rayonnement Sorbonne UniversitéCampus CurieCNRS UMR 76144 place Jussieu75005 ParisFrance Synchrotron SOLEIL L’orme des MerisiersB.P.48Saint AubinGif-sur-Yvette Cedex 91192France

The oxidation of porous Ni-yttria-stabilized zirconia(YSZ)and Ni-gadolinia-doped ceria(GDC)ceramicmetal(cermet)electrodes in H_(2)O and CO_(2)atmospheres was studied by near-ambient pressure X-ray photoelectron spectroscopy(NAP-XPS).We show that the oxidation of nickel by the two gases is not similar,as is commonly believed,but it depends on the ceramic *** is vulnerable to oxidation in H_(2)O but it resists to CO_(2)in Ni-GDC,as compared to the Ni-YSZ *** by this observation we conceptualize and fabricate Ni-YSZ electrodes modified by ceria nanoparticles,which show significantly higher resistance to CO_(2)oxidation as compared with conventional Ni-YSZ *** preparation of tailormade cermet electrodes with identical bulk/mechanical characteristics but very different surface properties offers a promising fabrication strategy for high-performance and durability solid oxide electrolysis cells for CO_(2)conversion.

关键词： NAP-XPS CO_(2)electrolysis Nickel oxidation Solid oxide cells Ceria nanoparticles

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Fe-N-C catalysts for oxygen electroreduction under external magnetic fields:Reduction of magnetic O_(2) to nonmagnetic H_(2)O

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Journal of Energy Chemistry 2022年第1期31卷 296-308,I0008页

作者： Wojciech Kicinski Jakub P.Sek Agata Kowalczyk sylwia turczyniak-surdacka Anna M.Nowicka Slawomir Dyjak Boguslaw Budner Mikolaj Donten Institute of Chemistry Military University of Technology2 Kaliskiego Str.PL 00-908 WarsawPoland Faculty of Chemistry University of WarsawPasteura 1 StrPL 02-093 WarsawPoland Faculty of Chemistry Biological and Chemical Research CentreUniversity of WarsawZwirki i Wigury 101 StrPL 02-089 WarsawPoland Institute of Optoelectronics Military University of Technology.2 Kaliskiego StrPL 00-908 WarsawPoland

An extensive analysis of iron-nitrogen-carbon(Fe-N-C)electrocatalysts synthesis and activity is presented concerning synthesis conditions such as initial Fe content,pyrolysis temperature and atmosphere(inert N_(2),reducing NH_(3),oxidizing Cl_(2) and their sequential combinations)and the influence of an external magnetic field on their performance in oxygen reduction reaction(ORR).Thermosetting porous polymers doped with FeCl_(3) were utilized as the Fe-N-C catalysts *** pyrolysis temperature was varied within a 700-900℃*** temperature and atmosphere of pyrolysis strongly affect the porosity and compositi on of the resultant Fe-N-C catalysts,while the in itial amount of Fe precursor shows much weaker *** under NH_(3) yields materials similar to those pyrolyzed under an inert atmosphere(N_(2)).In contrast,pyrolysis under Cl_(2) yields carbon of peculiar character with highly disordered structure and extensive *** application of a static external magnetic field strongly enhances the ORR process(herein studied in an alkaline environment)and the enhancement correlates with the Fe content in the Fe-N-C *** Fe-N-C materials containing ferromagnetic iron phase embedded in N-doped microporous carbon constitute attractive catalysts for magnetic field-aided anion exchange membrane fuel cell technology.

关键词： Oxygen reduction reaction Fe-N-C catalyst PGM-free catalyst Magnetic field Chronoamperometry Anion exchange membrane fuel cell (AEMFC)

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