Oxygen reduction reaction process of LaNi0.6Fe0.4O3 − δ film – porous Ce0.9Gd0.1O1.95 heterostructure electrode

R. A. Budiman; Shinichi Hashimoto; T. Nakamura; K. Yashiro; K. D. Bagarinao; H. Kishimoto; K. Yamaji; T. Horita; K. Amezawa; T. Kawada

doi:10.1016/j.ssi.2017.10.007

Oxygen reduction reaction process of LaNi_0.6Fe_0.4O_{3 − δ} film – porous Ce_0.9Gd_0.1O_1.95 heterostructure electrode

R. A. Budiman, Shinichi Hashimoto, T. Nakamura, K. Yashiro, K. D. Bagarinao, H. Kishimoto, K. Yamaji, T. Horita, K. Amezawa, T. Kawada

ENV - Environmental Studies for Advanced Society

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

9 Citations (Scopus)

Abstract

Relevant factors affecting an oxygen reduction reaction (ORR) in a heterostructure electrode comprising a Ce_0.9Gd_0.1O_1.95 porous layer on LaNi_0.6Fe_0.4O_{3 − δ} film electrode were evaluated using electrochemical impedance spectroscopy and isotope depth profile analyses. Despite the LaNi_0.6Fe_0.4O_{3 − δ} film – porous Ce_0.9Gd_0.1O_1.95 electrode having higher interfacial conductivity, σ_E, compared to a bare LaNi_0.6Fe_0.4O_{3 − δ} film electrode, σ_E behavior as a function of p(O₂) was similar to each measured temperature. This exhibits a good correlation with the isotopic oxygen depth profile analysis where the evaluated surface oxygen exchange coefficient, k*, showed enhancement compared to bare LaNi_0.6Fe_0.4O_{3 − δ} film and exhibited the same behavior on p(O₂). Based on the analyses, there are two plausible reasons for this enhancement: (a) the formation of triple phase boundaries at the junction of LaNi_0.6Fe_0.4O_{3 − δ} film, porous Ce_0.9Gd_0.1O_1.95, and gas phase, where the incorporation process during an ORR process takes place via the porous Ce_0.9Gd_0.1O_1.95; and (b) a modification of the subsurface layer just below the film surface where the presence of diffused Ce and Gd appears to accelerate the ORR process.

Original language	English
Pages (from-to)	80-87
Number of pages	8
Journal	Solid State Ionics
Volume	312
DOIs	https://doi.org/10.1016/j.ssi.2017.10.007
Publication status	Published - 2017 Dec 1

Keywords

CeGdO
Hetero-structure
LaNiFeO
Oxygen reduction reaction

ASJC Scopus subject areas

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

Access to Document

10.1016/j.ssi.2017.10.007

Cite this

@article{830eec1470084623b27b3dee119f2b84,

title = "Oxygen reduction reaction process of LaNi0.6Fe0.4O3 − δ film – porous Ce0.9Gd0.1O1.95 heterostructure electrode",

abstract = "Relevant factors affecting an oxygen reduction reaction (ORR) in a heterostructure electrode comprising a Ce0.9Gd0.1O1.95 porous layer on LaNi0.6Fe0.4O3 − δ film electrode were evaluated using electrochemical impedance spectroscopy and isotope depth profile analyses. Despite the LaNi0.6Fe0.4O3 − δ film – porous Ce0.9Gd0.1O1.95 electrode having higher interfacial conductivity, σE, compared to a bare LaNi0.6Fe0.4O3 − δ film electrode, σE behavior as a function of p(O2) was similar to each measured temperature. This exhibits a good correlation with the isotopic oxygen depth profile analysis where the evaluated surface oxygen exchange coefficient, k*, showed enhancement compared to bare LaNi0.6Fe0.4O3 − δ film and exhibited the same behavior on p(O2). Based on the analyses, there are two plausible reasons for this enhancement: (a) the formation of triple phase boundaries at the junction of LaNi0.6Fe0.4O3 − δ film, porous Ce0.9Gd0.1O1.95, and gas phase, where the incorporation process during an ORR process takes place via the porous Ce0.9Gd0.1O1.95; and (b) a modification of the subsurface layer just below the film surface where the presence of diffused Ce and Gd appears to accelerate the ORR process.",

keywords = "CeGdO, Hetero-structure, LaNiFeO, Oxygen reduction reaction",

author = "Budiman, {R. A.} and Shinichi Hashimoto and T. Nakamura and K. Yashiro and Bagarinao, {K. D.} and H. Kishimoto and K. Yamaji and T. Horita and K. Amezawa and T. Kawada",

note = "Funding Information: This work was supported by Japan Science and Technology , Japan, as part of “Phase Interface Science for Highly Efficient Energy Utilization” project in strategic basic research program, JST-CREST Grant ( JPMJCR11C1 ). The authors gratefully acknowledge Dr. Takamichi Miyazaki of Tohoku University for his help taking SIMS measurement. Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2017",

month = dec,

day = "1",

doi = "10.1016/j.ssi.2017.10.007",

language = "English",

volume = "312",

pages = "80--87",

journal = "Solid State Ionics",

issn = "0167-2738",

publisher = "Elsevier",

}

TY - JOUR

T1 - Oxygen reduction reaction process of LaNi0.6Fe0.4O3 − δ film – porous Ce0.9Gd0.1O1.95 heterostructure electrode

AU - Budiman, R. A.

AU - Hashimoto, Shinichi

AU - Nakamura, T.

AU - Yashiro, K.

AU - Bagarinao, K. D.

AU - Kishimoto, H.

AU - Yamaji, K.

AU - Horita, T.

AU - Amezawa, K.

AU - Kawada, T.

N1 - Funding Information: This work was supported by Japan Science and Technology , Japan, as part of “Phase Interface Science for Highly Efficient Energy Utilization” project in strategic basic research program, JST-CREST Grant ( JPMJCR11C1 ). The authors gratefully acknowledge Dr. Takamichi Miyazaki of Tohoku University for his help taking SIMS measurement. Publisher Copyright: © 2017 Elsevier B.V.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - Relevant factors affecting an oxygen reduction reaction (ORR) in a heterostructure electrode comprising a Ce0.9Gd0.1O1.95 porous layer on LaNi0.6Fe0.4O3 − δ film electrode were evaluated using electrochemical impedance spectroscopy and isotope depth profile analyses. Despite the LaNi0.6Fe0.4O3 − δ film – porous Ce0.9Gd0.1O1.95 electrode having higher interfacial conductivity, σE, compared to a bare LaNi0.6Fe0.4O3 − δ film electrode, σE behavior as a function of p(O2) was similar to each measured temperature. This exhibits a good correlation with the isotopic oxygen depth profile analysis where the evaluated surface oxygen exchange coefficient, k*, showed enhancement compared to bare LaNi0.6Fe0.4O3 − δ film and exhibited the same behavior on p(O2). Based on the analyses, there are two plausible reasons for this enhancement: (a) the formation of triple phase boundaries at the junction of LaNi0.6Fe0.4O3 − δ film, porous Ce0.9Gd0.1O1.95, and gas phase, where the incorporation process during an ORR process takes place via the porous Ce0.9Gd0.1O1.95; and (b) a modification of the subsurface layer just below the film surface where the presence of diffused Ce and Gd appears to accelerate the ORR process.

AB - Relevant factors affecting an oxygen reduction reaction (ORR) in a heterostructure electrode comprising a Ce0.9Gd0.1O1.95 porous layer on LaNi0.6Fe0.4O3 − δ film electrode were evaluated using electrochemical impedance spectroscopy and isotope depth profile analyses. Despite the LaNi0.6Fe0.4O3 − δ film – porous Ce0.9Gd0.1O1.95 electrode having higher interfacial conductivity, σE, compared to a bare LaNi0.6Fe0.4O3 − δ film electrode, σE behavior as a function of p(O2) was similar to each measured temperature. This exhibits a good correlation with the isotopic oxygen depth profile analysis where the evaluated surface oxygen exchange coefficient, k*, showed enhancement compared to bare LaNi0.6Fe0.4O3 − δ film and exhibited the same behavior on p(O2). Based on the analyses, there are two plausible reasons for this enhancement: (a) the formation of triple phase boundaries at the junction of LaNi0.6Fe0.4O3 − δ film, porous Ce0.9Gd0.1O1.95, and gas phase, where the incorporation process during an ORR process takes place via the porous Ce0.9Gd0.1O1.95; and (b) a modification of the subsurface layer just below the film surface where the presence of diffused Ce and Gd appears to accelerate the ORR process.

KW - CeGdO

KW - Hetero-structure

KW - LaNiFeO

KW - Oxygen reduction reaction

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DO - 10.1016/j.ssi.2017.10.007

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