Relationship between electrochemical properties and electrolyte partial conductivities of proton-conducting ceramic fuel cells

Y. Matsuzaki, Y. Tachikawa, T. Somekawa, K. Sato, Y. Kawabata, M. Sugahara, H. Matsumoto, S. Taniguchi, K. Sasaki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

The electrochemical properties of the proton-conducting ceramic fuel cells (PCFCs) with BaZr0.1Ce0.7Y0.1X0.1O3-δ (BZCYX, X = Ga, Sc, In, Yb, or Gd) electrolytes have been investigated. BZCYX materials were found to have various partial conductivities of charge-carriers such as ion, hole, and electron. The electrochemical properties exhibited strong dependences on operation conditions. When ASR and external current density were fixed at 0.4 Ω cm2 and 0.25 A cm-2, respectively, the electrical efficiency, η(X), was found to have the following sequential order: η(Sc) > η(In) > η(Ga) > η(Yb) > η(Gd). On the other hand, when ASR was not fixed but the thickness of the electrolyte was fixed at 25 μm, large variations appeared in the leakage current of the cells with the BZCYX electrolytes. The sequential order of the electrical efficiency with the fixed thickness was different from that with the fixed ASR as described in the above inequality expression, and depends on the operating temperature. The ratios of the leakage current with X = Yb or Gd were higher than those with X = Ga, Sc, or In. These high ratios were found to cause the serious drop in the electrical efficiency at an external current density of 0.25 A cm-2. We have successfully found out the candidates for the X element in BZCYX, by which high-efficient power generation would be expected.

Original languageEnglish
Title of host publicationECS Transactions
EditorsT. Kawada, S. C. Singhal
PublisherElectrochemical Society Inc.
Pages441-450
Number of pages10
Edition1
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - May 30 2017
Event15th International Symposium on Solid Oxide Fuel Cells, SOFC 2017 - Hollywood, United States
Duration: Jul 23 2017Jul 28 2017

Publication series

NameECS Transactions
Number1
Volume78
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other15th International Symposium on Solid Oxide Fuel Cells, SOFC 2017
CountryUnited States
CityHollywood
Period7/23/177/28/17

Fingerprint

Electrochemical properties
Fuel cells
Protons
Electrolytes
Leakage currents
Current density
Charge carriers
Power generation
Electrons
Ions
Temperature

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Matsuzaki, Y., Tachikawa, Y., Somekawa, T., Sato, K., Kawabata, Y., Sugahara, M., ... Sasaki, K. (2017). Relationship between electrochemical properties and electrolyte partial conductivities of proton-conducting ceramic fuel cells. In T. Kawada, & S. C. Singhal (Eds.), ECS Transactions (1 ed., pp. 441-450). (ECS Transactions; Vol. 78, No. 1). Electrochemical Society Inc.. https://doi.org/10.1149/07801.0441ecst

Relationship between electrochemical properties and electrolyte partial conductivities of proton-conducting ceramic fuel cells. / Matsuzaki, Y.; Tachikawa, Y.; Somekawa, T.; Sato, K.; Kawabata, Y.; Sugahara, M.; Matsumoto, H.; Taniguchi, S.; Sasaki, K.

ECS Transactions. ed. / T. Kawada; S. C. Singhal. 1. ed. Electrochemical Society Inc., 2017. p. 441-450 (ECS Transactions; Vol. 78, No. 1).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Matsuzaki, Y, Tachikawa, Y, Somekawa, T, Sato, K, Kawabata, Y, Sugahara, M, Matsumoto, H, Taniguchi, S & Sasaki, K 2017, Relationship between electrochemical properties and electrolyte partial conductivities of proton-conducting ceramic fuel cells. in T Kawada & SC Singhal (eds), ECS Transactions. 1 edn, ECS Transactions, no. 1, vol. 78, Electrochemical Society Inc., pp. 441-450, 15th International Symposium on Solid Oxide Fuel Cells, SOFC 2017, Hollywood, United States, 7/23/17. https://doi.org/10.1149/07801.0441ecst
Matsuzaki Y, Tachikawa Y, Somekawa T, Sato K, Kawabata Y, Sugahara M et al. Relationship between electrochemical properties and electrolyte partial conductivities of proton-conducting ceramic fuel cells. In Kawada T, Singhal SC, editors, ECS Transactions. 1 ed. Electrochemical Society Inc. 2017. p. 441-450. (ECS Transactions; 1). https://doi.org/10.1149/07801.0441ecst
Matsuzaki, Y. ; Tachikawa, Y. ; Somekawa, T. ; Sato, K. ; Kawabata, Y. ; Sugahara, M. ; Matsumoto, H. ; Taniguchi, S. ; Sasaki, K. / Relationship between electrochemical properties and electrolyte partial conductivities of proton-conducting ceramic fuel cells. ECS Transactions. editor / T. Kawada ; S. C. Singhal. 1. ed. Electrochemical Society Inc., 2017. pp. 441-450 (ECS Transactions; 1).
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