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...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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MDPI
2019
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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. |
format | Online Article Text |
id | pubmed-6723951 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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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