Electrical properties of Nb-doped SrTiO3 ceramics with excess TiO2 for anodes and interconnects of SOFCs

Fumimasa Horikiri; Li Qun Han; Naofumi Iizawa; Kazuhisa Sato; Keiji Yashiro; Tatsuya Kawada; Junichiro Mizusaki

doi:10.1149/1.2729272

Electrical properties of Nb-doped SrTiO₃ ceramics with excess TiO₂ for anodes and interconnects of SOFCs

Fumimasa Horikiri, Li Qun Han, Naofumi Iizawa, Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Junichiro Mizusaki

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The electrical properties of Nb-doped SrTiO₃ ceramics with and without excess TiO₂ were investigated for anodes and interconnects of solid oxide fuel cells (SOFCs) by a DC 4-probe conductivity measurement. The microstructures and the grain boundary properties were revealed by SEM, EDX, SEM-EBSP-OIM and HRTEM. It was found that addition of excess TiO₂ reduces the influence of the grain boundary on the conductivity of Nb-doped SrTiO₃ ceramics, and the conductivity turned to be metallic in SOFCs operating temperatures The second phases such as TiO₂ and Nb ₂O₅ were found in the composition of excess TiO ₂. No grain boundary segregation was found, and randomly distributed grain boundaries were found predominant in the Nb-doped SrTiO₃ ceramics with and without excess TiO₂. The defects at the grain boundary were discussed.

Original language	English
Title of host publication	ECS Transactions - 10th International Symposium on Solid Oxide Fuel Cells, SOFC-X
Pages	1639-1644
Number of pages	6
Edition	1 PART 2
DOIs	https://doi.org/10.1149/1.2729272
Publication status	Published - 2007 Dec 1
Event	10th International Symposium on Solid Oxide Fuel Cells, SOFC-X - , Japan Duration: 2007 Jun 3 → 2007 Jun 8

Publication series

Name	ECS Transactions
Number	1 PART 2
Volume	7
ISSN (Print)	1938-5862
ISSN (Electronic)	1938-6737

Other

Other	10th International Symposium on Solid Oxide Fuel Cells, SOFC-X
Country/Territory	Japan
Period	07/6/3 → 07/6/8

ASJC Scopus subject areas

Engineering(all)

Access to Document

10.1149/1.2729272

Cite this

Horikiri, F., Han, L. Q., Iizawa, N., Sato, K., Yashiro, K., Kawada, T., & Mizusaki, J. (2007). Electrical properties of Nb-doped SrTiO₃ ceramics with excess TiO₂ for anodes and interconnects of SOFCs. In ECS Transactions - 10th International Symposium on Solid Oxide Fuel Cells, SOFC-X (1 PART 2 ed., pp. 1639-1644). (ECS Transactions; Vol. 7, No. 1 PART 2). https://doi.org/10.1149/1.2729272

Electrical properties of Nb-doped SrTiO₃ ceramics with excess TiO₂ for anodes and interconnects of SOFCs. / Horikiri, Fumimasa; Han, Li Qun; Iizawa, Naofumi; Sato, Kazuhisa ; Yashiro, Keiji ; Kawada, Tatsuya; Mizusaki, Junichiro.

ECS Transactions - 10th International Symposium on Solid Oxide Fuel Cells, SOFC-X. 1 PART 2. ed. 2007. p. 1639-1644 (ECS Transactions; Vol. 7, No. 1 PART 2).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Horikiri, F, Han, LQ, Iizawa, N, Sato, K , Yashiro, K , Kawada, T & Mizusaki, J 2007, Electrical properties of Nb-doped SrTiO₃ ceramics with excess TiO₂ for anodes and interconnects of SOFCs. in ECS Transactions - 10th International Symposium on Solid Oxide Fuel Cells, SOFC-X. 1 PART 2 edn, ECS Transactions, no. 1 PART 2, vol. 7, pp. 1639-1644, 10th International Symposium on Solid Oxide Fuel Cells, SOFC-X, Japan, 07/6/3. https://doi.org/10.1149/1.2729272

Horikiri, Fumimasa ; Han, Li Qun ; Iizawa, Naofumi ; Sato, Kazuhisa ; Yashiro, Keiji ; Kawada, Tatsuya ; Mizusaki, Junichiro. / Electrical properties of Nb-doped SrTiO₃ ceramics with excess TiO₂ for anodes and interconnects of SOFCs. ECS Transactions - 10th International Symposium on Solid Oxide Fuel Cells, SOFC-X. 1 PART 2. ed. 2007. pp. 1639-1644 (ECS Transactions; 1 PART 2).

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abstract = "The electrical properties of Nb-doped SrTiO3 ceramics with and without excess TiO2 were investigated for anodes and interconnects of solid oxide fuel cells (SOFCs) by a DC 4-probe conductivity measurement. The microstructures and the grain boundary properties were revealed by SEM, EDX, SEM-EBSP-OIM and HRTEM. It was found that addition of excess TiO2 reduces the influence of the grain boundary on the conductivity of Nb-doped SrTiO3 ceramics, and the conductivity turned to be metallic in SOFCs operating temperatures The second phases such as TiO2 and Nb 2O5 were found in the composition of excess TiO 2. No grain boundary segregation was found, and randomly distributed grain boundaries were found predominant in the Nb-doped SrTiO3 ceramics with and without excess TiO2. The defects at the grain boundary were discussed.",

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AU - Horikiri, Fumimasa

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AU - Sato, Kazuhisa

AU - Yashiro, Keiji

AU - Kawada, Tatsuya

AU - Mizusaki, Junichiro

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AB - The electrical properties of Nb-doped SrTiO3 ceramics with and without excess TiO2 were investigated for anodes and interconnects of solid oxide fuel cells (SOFCs) by a DC 4-probe conductivity measurement. The microstructures and the grain boundary properties were revealed by SEM, EDX, SEM-EBSP-OIM and HRTEM. It was found that addition of excess TiO2 reduces the influence of the grain boundary on the conductivity of Nb-doped SrTiO3 ceramics, and the conductivity turned to be metallic in SOFCs operating temperatures The second phases such as TiO2 and Nb 2O5 were found in the composition of excess TiO 2. No grain boundary segregation was found, and randomly distributed grain boundaries were found predominant in the Nb-doped SrTiO3 ceramics with and without excess TiO2. The defects at the grain boundary were discussed.

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