Correlation between Concentrations of Ni and Y in Y-Doped BaZrO(3) Electrolyte in Co-Sintered Cells: A Case of Controlled NiO Activity by Using MgO-NiO Solid Solution as Anode Substrate

BaZr(0.8)Y(0.2)O(3-δ) (BZY20) is promising to be applied as an electrolyte in fuel cells, electrolysis cells, etc. However, when a half cell composed of a BZY20 electrolyte layer and a BZY20-NiO composite anode substrate is co-sintered (1400–1600 °C), Ni diffuses from the anode substrate into the el...

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Autores principales: Han, Donglin, Kuno, Kenji, Uda, Tetsuya
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6723951/
https://www.ncbi.nlm.nih.gov/pubmed/31382499
http://dx.doi.org/10.3390/membranes9080095
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author Han, Donglin
Kuno, Kenji
Uda, Tetsuya
author_facet Han, Donglin
Kuno, Kenji
Uda, Tetsuya
author_sort Han, Donglin
collection PubMed
description BaZr(0.8)Y(0.2)O(3-δ) (BZY20) is promising to be applied as an electrolyte in fuel cells, electrolysis cells, etc. However, when a half cell composed of a BZY20 electrolyte layer and a BZY20-NiO composite anode substrate is co-sintered (1400–1600 °C), Ni diffuses from the anode substrate into the electrolyte layer. Y content in the electrolyte layer decreases dramatically, since BZY20 cannot be equilibrated with NiO at such high temperature. Such Ni diffusion and Y loss are detrimental to the electrochemical performance of the electrolyte layer. In this work, we added MgO-NiO solid solution into the anode substrate to adjust the NiO activity (a(NiO)) during the co-sintering process, and used three different co-sintering methods to control the BaO activity (a(BaO)). The results revealed that by decreasing a(NiO) in the system, the as-co-sintered electrolyte layer had the composition shifting towards the direction of high Y and low Ni cation ratios. A clear correlation between the intra-grain concentration of Ni and Y was confirmed. In other words, to prepare the electrolyte with the same Y cation ratio, the Ni diffusion into the electrolyte layer can be suppressed by using the MgO-NiO solid solution with a high MgO ratio and a low Ni ratio. Moreover, by increasing a(BaO), we found that the Y cation ratio increased and approached the nominal value of the pristine BZY20, when Mg(1−x)Ni(x)O (x = 0.3 and 0.5) was used. In summary, both a(NiO) and a(BaO) play important roles in governing the composition of the electrolyte layer prepared by the co-sintering process. To evaluate the quality of the electrolyte layer, both the intra-grain Y and Ni concentrations should be carefully checked.
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spelling pubmed-67239512019-09-10 Correlation between Concentrations of Ni and Y in Y-Doped BaZrO(3) Electrolyte in Co-Sintered Cells: A Case of Controlled NiO Activity by Using MgO-NiO Solid Solution as Anode Substrate Han, Donglin Kuno, Kenji Uda, Tetsuya Membranes (Basel) Article BaZr(0.8)Y(0.2)O(3-δ) (BZY20) is promising to be applied as an electrolyte in fuel cells, electrolysis cells, etc. However, when a half cell composed of a BZY20 electrolyte layer and a BZY20-NiO composite anode substrate is co-sintered (1400–1600 °C), Ni diffuses from the anode substrate into the electrolyte layer. Y content in the electrolyte layer decreases dramatically, since BZY20 cannot be equilibrated with NiO at such high temperature. Such Ni diffusion and Y loss are detrimental to the electrochemical performance of the electrolyte layer. In this work, we added MgO-NiO solid solution into the anode substrate to adjust the NiO activity (a(NiO)) during the co-sintering process, and used three different co-sintering methods to control the BaO activity (a(BaO)). The results revealed that by decreasing a(NiO) in the system, the as-co-sintered electrolyte layer had the composition shifting towards the direction of high Y and low Ni cation ratios. A clear correlation between the intra-grain concentration of Ni and Y was confirmed. In other words, to prepare the electrolyte with the same Y cation ratio, the Ni diffusion into the electrolyte layer can be suppressed by using the MgO-NiO solid solution with a high MgO ratio and a low Ni ratio. Moreover, by increasing a(BaO), we found that the Y cation ratio increased and approached the nominal value of the pristine BZY20, when Mg(1−x)Ni(x)O (x = 0.3 and 0.5) was used. In summary, both a(NiO) and a(BaO) play important roles in governing the composition of the electrolyte layer prepared by the co-sintering process. To evaluate the quality of the electrolyte layer, both the intra-grain Y and Ni concentrations should be carefully checked. MDPI 2019-08-02 /pmc/articles/PMC6723951/ /pubmed/31382499 http://dx.doi.org/10.3390/membranes9080095 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Han, Donglin
Kuno, Kenji
Uda, Tetsuya
Correlation between Concentrations of Ni and Y in Y-Doped BaZrO(3) Electrolyte in Co-Sintered Cells: A Case of Controlled NiO Activity by Using MgO-NiO Solid Solution as Anode Substrate
title Correlation between Concentrations of Ni and Y in Y-Doped BaZrO(3) Electrolyte in Co-Sintered Cells: A Case of Controlled NiO Activity by Using MgO-NiO Solid Solution as Anode Substrate
title_full Correlation between Concentrations of Ni and Y in Y-Doped BaZrO(3) Electrolyte in Co-Sintered Cells: A Case of Controlled NiO Activity by Using MgO-NiO Solid Solution as Anode Substrate
title_fullStr Correlation between Concentrations of Ni and Y in Y-Doped BaZrO(3) Electrolyte in Co-Sintered Cells: A Case of Controlled NiO Activity by Using MgO-NiO Solid Solution as Anode Substrate
title_full_unstemmed Correlation between Concentrations of Ni and Y in Y-Doped BaZrO(3) Electrolyte in Co-Sintered Cells: A Case of Controlled NiO Activity by Using MgO-NiO Solid Solution as Anode Substrate
title_short Correlation between Concentrations of Ni and Y in Y-Doped BaZrO(3) Electrolyte in Co-Sintered Cells: A Case of Controlled NiO Activity by Using MgO-NiO Solid Solution as Anode Substrate
title_sort correlation between concentrations of ni and y in y-doped bazro(3) electrolyte in co-sintered cells: a case of controlled nio activity by using mgo-nio solid solution as anode substrate
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6723951/
https://www.ncbi.nlm.nih.gov/pubmed/31382499
http://dx.doi.org/10.3390/membranes9080095
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