Electrode reaction and microstructure of La0.6Sr0.4CoO3-δ thin films

Maya Sase; Junji Suzuki; Keiji Yashiro; Takanori Otake; Atsushi Kaimai; Tatsuya Kawada; Junichiro Mizusaki; Hiroo Yugami

doi:10.1016/j.ssi.2006.01.018

Electrode reaction and microstructure of La_0.6Sr_0.4CoO_3-δ thin films

Maya Sase, Junji Suzuki, Keiji Yashiro, Takanori Otake, Atsushi Kaimai, Tatsuya Kawada, Junichiro Mizusaki, Hiroo Yugami

Research output: Contribution to journal › Article › peer-review

37 Citations (Scopus)

Abstract

Dense La_0.6Sr_0.4CoO_3-δ film electrodes were deposited by pulsed laser deposition (PLD) on Ce_0.9Gd_0.1O_1.95 electrolytes. The grain size of one film was 300-500 nm, and the other was 30-50 nm. DC polarization and AC impedance measurements were performed at 873 K-1073 K in O₂-Ar gas mixtures. From investigations of the electrochemical capacitances, the rate determining process for both electrodes were confirmed to be the surface reaction. The analyses in the electrochemical resistance revealed that the oxygen adsorption/desorption rate was faster on the electrode with smaller grain size. DC responses agreed with AC results, so the current density on the nano-grain electrode was larger by half an order than those of the sub-micron-grain electrode. Under a dilute oxygen atmosphere, the rate determining step transferred from a surface reaction to a gas phase diffusion.

Original language	English
Pages (from-to)	1961-1964
Number of pages	4
Journal	Solid State Ionics
Volume	177
Issue number	19-25 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.ssi.2006.01.018
Publication status	Published - 2006 Oct 15

Keywords

(La,Sr)CoO
Nano-crystalline
Oxygen exchange
Pulsed laser deposition
SOFC cathode

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

Access to Document

10.1016/j.ssi.2006.01.018

Cite this

@article{a64edd8a66594cd8976b893d20ea632d,

title = "Electrode reaction and microstructure of La0.6Sr0.4CoO3-δ thin films",

abstract = "Dense La0.6Sr0.4CoO3-δ film electrodes were deposited by pulsed laser deposition (PLD) on Ce0.9Gd0.1O1.95 electrolytes. The grain size of one film was 300-500 nm, and the other was 30-50 nm. DC polarization and AC impedance measurements were performed at 873 K-1073 K in O2-Ar gas mixtures. From investigations of the electrochemical capacitances, the rate determining process for both electrodes were confirmed to be the surface reaction. The analyses in the electrochemical resistance revealed that the oxygen adsorption/desorption rate was faster on the electrode with smaller grain size. DC responses agreed with AC results, so the current density on the nano-grain electrode was larger by half an order than those of the sub-micron-grain electrode. Under a dilute oxygen atmosphere, the rate determining step transferred from a surface reaction to a gas phase diffusion.",

keywords = "(La,Sr)CoO, Nano-crystalline, Oxygen exchange, Pulsed laser deposition, SOFC cathode",

author = "Maya Sase and Junji Suzuki and Keiji Yashiro and Takanori Otake and Atsushi Kaimai and Tatsuya Kawada and Junichiro Mizusaki and Hiroo Yugami",

note = "Funding Information: This research was partially supported by the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for JSPS Research Fellow, 10865, 2002, and in part by the Grant-in-Aid for Scientific Research on Priority Area, “Nanoionics (439) by the Ministry of Education, Culture, Sports, and Technology.",

year = "2006",

month = oct,

day = "15",

doi = "10.1016/j.ssi.2006.01.018",

language = "English",

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journal = "Solid State Ionics",

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TY - JOUR

T1 - Electrode reaction and microstructure of La0.6Sr0.4CoO3-δ thin films

AU - Sase, Maya

AU - Suzuki, Junji

AU - Yashiro, Keiji

AU - Otake, Takanori

AU - Kaimai, Atsushi

AU - Kawada, Tatsuya

AU - Mizusaki, Junichiro

AU - Yugami, Hiroo

N1 - Funding Information: This research was partially supported by the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for JSPS Research Fellow, 10865, 2002, and in part by the Grant-in-Aid for Scientific Research on Priority Area, “Nanoionics (439) by the Ministry of Education, Culture, Sports, and Technology.

PY - 2006/10/15

Y1 - 2006/10/15

N2 - Dense La0.6Sr0.4CoO3-δ film electrodes were deposited by pulsed laser deposition (PLD) on Ce0.9Gd0.1O1.95 electrolytes. The grain size of one film was 300-500 nm, and the other was 30-50 nm. DC polarization and AC impedance measurements were performed at 873 K-1073 K in O2-Ar gas mixtures. From investigations of the electrochemical capacitances, the rate determining process for both electrodes were confirmed to be the surface reaction. The analyses in the electrochemical resistance revealed that the oxygen adsorption/desorption rate was faster on the electrode with smaller grain size. DC responses agreed with AC results, so the current density on the nano-grain electrode was larger by half an order than those of the sub-micron-grain electrode. Under a dilute oxygen atmosphere, the rate determining step transferred from a surface reaction to a gas phase diffusion.

AB - Dense La0.6Sr0.4CoO3-δ film electrodes were deposited by pulsed laser deposition (PLD) on Ce0.9Gd0.1O1.95 electrolytes. The grain size of one film was 300-500 nm, and the other was 30-50 nm. DC polarization and AC impedance measurements were performed at 873 K-1073 K in O2-Ar gas mixtures. From investigations of the electrochemical capacitances, the rate determining process for both electrodes were confirmed to be the surface reaction. The analyses in the electrochemical resistance revealed that the oxygen adsorption/desorption rate was faster on the electrode with smaller grain size. DC responses agreed with AC results, so the current density on the nano-grain electrode was larger by half an order than those of the sub-micron-grain electrode. Under a dilute oxygen atmosphere, the rate determining step transferred from a surface reaction to a gas phase diffusion.

KW - (La,Sr)CoO

KW - Nano-crystalline

KW - Oxygen exchange

KW - Pulsed laser deposition

KW - SOFC cathode

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