New Insights on the Nickel State Deposited by Hydrazine Wet-Chemical Synthesis Route in the Ni/BCY15 Proton-Conducting SOFC Anode
| Autor: | G. Raikova, D. Nikolova, Emiliya Mladenova, Daria Vladikova, Yordanka Karakirova, Krassimir L. Kostov, Margarita Gabrovska |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
General Chemical Engineering Oxide chemistry.chemical_element hydrazine reduction Electrochemistry Article chemistry.chemical_compound Ni–Ce interaction XPS Ni/BCY15 proton-conducting anode General Materials Science SOFC QD1-999 Cermet Anode Dielectric spectroscopy Nickel Cerium Chemistry electrochemical impedance spectroscopy chemistry Chemical engineering EPR Ethylene glycol |
| Zdroj: | Nanomaterials, Vol 11, Iss 3224, p 3224 (2021) Nanomaterials; Volume 11; Issue 12; Pages: 3224 Nanomaterials |
| ISSN: | 2079-4991 |
| Popis: | Yttrium-doped barium cerate (BCY15) was used as an anode ceramic matrix for synthesis of the Ni-based cermet anode with application in proton-conducting solid oxide fuel cells (pSOFC). The hydrazine wet-chemical synthesis was developed as an alternative low-cost energy-efficient route that promotes ‘in situ’ introduction of metallic Ni particles in the BCY15 matrix. The focus of this study is a detailed comparative characterization of the nickel state in the Ni/BCY15 cermets obtained in two types of medium, aqueous and anhydrous ethylene glycol environment, performed by a combination of XRD, N2 physisorption, SEM, EPR, XPS, and electrochemical impedance spectroscopy. Obtained results on the effect of the working medium show that ethylene glycol ensures active Ni cermet preparation with well-dispersed nanoscale metal Ni particles and provides a strong interaction between hydrazine-originating metallic Ni and cerium from the BCY15 matrix. The metallic Ni phase in the pSOFC anode is more stable during reoxidation compared to the Ni cermet prepared by the commercial mechanical mixing procedure. These factors contribute toward improvement of the anode’s electrochemical performance in pSOFC, enhanced stability, and a lower degradation rate during operation. |
| Databáze: | OpenAIRE |
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