Morphologically well-defined Gd0.1Ce0.9O1.95 embedded Ba0.5Sr0.5Co0.8Fe0.2O3-Δ nanofiber with an enhanced triple phase boundary as cathode for low-temperature solid oxide fuel cells

Chanho Kim; Hyunjung Park; Inyoung Jang; Sungmin Kim; Kijung Kim; Heesung Yoon; Ungyu Paik

doi:10.1016/j.jpowsour.2017.12.065

Morphologically well-defined Gd_0.1Ce_0.9O_1.95 embedded Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-Δ nanofiber with an enhanced triple phase boundary as cathode for low-temperature solid oxide fuel cells

Chanho Kim, Hyunjung Park, Inyoung Jang, Sungmin Kim, Kijung Kim, Heesung Yoon, Ungyu Paik

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

51 Scopus citations

Abstract

Controlling triple phase boundary (TPB), an intersection of the ionic conductor, electronic conductor and gas phase as a major reaction site, is a key to improve cell performances for low-temperature solid oxide fuel cells. We report a synthesis of morphologically well-defined Gd_0.1Ce_0.9O_1.95 (GDC) embedded Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ (BSCF) nanofibers and their electrochemical performances as a cathode. Electrospun fibers prepared with a polymeric solution that contains crystalline Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ particles in ∼200 nm size and Gd(NO₃)₃/Ce(NO₃)₃ precursors in an optimized weight ratio of 3 to 2 result in one dimensional structure without severe agglomeration and morphological collapse even after a high calcination at 1000 °C. As-prepared nanofibers have fast electron pathways along the axial direction of fibers, a higher surface area of 7.5 m² g⁻¹, and more oxygen reaction sites at TPBs than those of GDC/BSCF composite particles and core-shell nanofibers. As a result, the Gd_0.1Ce_0.9O_1.95 embedded Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ nanofiber cell shows excellent performances of the maximum power density of 0.65 W cm⁻² at 550 °C and 1.02 W cm⁻² at 600 °C, respectively.

Original language	English
Pages (from-to)	404-411
Number of pages	8
Journal	Journal of Power Sources
Volume	378
DOIs	https://doi.org/10.1016/j.jpowsour.2017.12.065
State	Published - Feb 28 2018
Externally published	Yes

Funding

This work was supported by the New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning ( KETEP ), which was granted financial resources from the Ministry of Trade, Industry & Energy, Republic of Korea ( 20153030031480) , and by the Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), which was granted financial resources from the Ministry of Trade, Industry & Energy, Republic of Korea ( 20174010201240 ).

Keywords

BSCF
Cathode
Electrospinning
Nanofiber
Solid oxide fuel cell

Access to Document

10.1016/j.jpowsour.2017.12.065

Cite this

@article{b24c21698b19464f819434e71c67146b,

title = "Morphologically well-defined Gd0.1Ce0.9O1.95 embedded Ba0.5Sr0.5Co0.8Fe0.2O3-Δ nanofiber with an enhanced triple phase boundary as cathode for low-temperature solid oxide fuel cells",

abstract = "Controlling triple phase boundary (TPB), an intersection of the ionic conductor, electronic conductor and gas phase as a major reaction site, is a key to improve cell performances for low-temperature solid oxide fuel cells. We report a synthesis of morphologically well-defined Gd0.1Ce0.9O1.95 (GDC) embedded Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) nanofibers and their electrochemical performances as a cathode. Electrospun fibers prepared with a polymeric solution that contains crystalline Ba0.5Sr0.5Co0.8Fe0.2O3-δ particles in ∼200 nm size and Gd(NO3)3/Ce(NO3)3 precursors in an optimized weight ratio of 3 to 2 result in one dimensional structure without severe agglomeration and morphological collapse even after a high calcination at 1000 °C. As-prepared nanofibers have fast electron pathways along the axial direction of fibers, a higher surface area of 7.5 m2 g−1, and more oxygen reaction sites at TPBs than those of GDC/BSCF composite particles and core-shell nanofibers. As a result, the Gd0.1Ce0.9O1.95 embedded Ba0.5Sr0.5Co0.8Fe0.2O3-δ nanofiber cell shows excellent performances of the maximum power density of 0.65 W cm−2 at 550 °C and 1.02 W cm−2 at 600 °C, respectively.",

keywords = "BSCF, Cathode, Electrospinning, Nanofiber, Solid oxide fuel cell",

author = "Chanho Kim and Hyunjung Park and Inyoung Jang and Sungmin Kim and Kijung Kim and Heesung Yoon and Ungyu Paik",

note = "Publisher Copyright: {\textcopyright} 2017",

year = "2018",

month = feb,

day = "28",

doi = "10.1016/j.jpowsour.2017.12.065",

language = "English",

volume = "378",

pages = "404--411",

journal = "Journal of Power Sources",

issn = "0378-7753",

publisher = "Elsevier",

}

TY - JOUR

T1 - Morphologically well-defined Gd0.1Ce0.9O1.95 embedded Ba0.5Sr0.5Co0.8Fe0.2O3-Δ nanofiber with an enhanced triple phase boundary as cathode for low-temperature solid oxide fuel cells

AU - Kim, Chanho

AU - Park, Hyunjung

AU - Jang, Inyoung

AU - Kim, Sungmin

AU - Kim, Kijung

AU - Yoon, Heesung

AU - Paik, Ungyu

PY - 2018/2/28

Y1 - 2018/2/28

N2 - Controlling triple phase boundary (TPB), an intersection of the ionic conductor, electronic conductor and gas phase as a major reaction site, is a key to improve cell performances for low-temperature solid oxide fuel cells. We report a synthesis of morphologically well-defined Gd0.1Ce0.9O1.95 (GDC) embedded Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) nanofibers and their electrochemical performances as a cathode. Electrospun fibers prepared with a polymeric solution that contains crystalline Ba0.5Sr0.5Co0.8Fe0.2O3-δ particles in ∼200 nm size and Gd(NO3)3/Ce(NO3)3 precursors in an optimized weight ratio of 3 to 2 result in one dimensional structure without severe agglomeration and morphological collapse even after a high calcination at 1000 °C. As-prepared nanofibers have fast electron pathways along the axial direction of fibers, a higher surface area of 7.5 m2 g−1, and more oxygen reaction sites at TPBs than those of GDC/BSCF composite particles and core-shell nanofibers. As a result, the Gd0.1Ce0.9O1.95 embedded Ba0.5Sr0.5Co0.8Fe0.2O3-δ nanofiber cell shows excellent performances of the maximum power density of 0.65 W cm−2 at 550 °C and 1.02 W cm−2 at 600 °C, respectively.

AB - Controlling triple phase boundary (TPB), an intersection of the ionic conductor, electronic conductor and gas phase as a major reaction site, is a key to improve cell performances for low-temperature solid oxide fuel cells. We report a synthesis of morphologically well-defined Gd0.1Ce0.9O1.95 (GDC) embedded Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) nanofibers and their electrochemical performances as a cathode. Electrospun fibers prepared with a polymeric solution that contains crystalline Ba0.5Sr0.5Co0.8Fe0.2O3-δ particles in ∼200 nm size and Gd(NO3)3/Ce(NO3)3 precursors in an optimized weight ratio of 3 to 2 result in one dimensional structure without severe agglomeration and morphological collapse even after a high calcination at 1000 °C. As-prepared nanofibers have fast electron pathways along the axial direction of fibers, a higher surface area of 7.5 m2 g−1, and more oxygen reaction sites at TPBs than those of GDC/BSCF composite particles and core-shell nanofibers. As a result, the Gd0.1Ce0.9O1.95 embedded Ba0.5Sr0.5Co0.8Fe0.2O3-δ nanofiber cell shows excellent performances of the maximum power density of 0.65 W cm−2 at 550 °C and 1.02 W cm−2 at 600 °C, respectively.

KW - BSCF

KW - Cathode

KW - Electrospinning

KW - Nanofiber

KW - Solid oxide fuel cell

UR - https://www.scopus.com/pages/publications/85039860562

U2 - 10.1016/j.jpowsour.2017.12.065

DO - 10.1016/j.jpowsour.2017.12.065

M3 - Article

AN - SCOPUS:85039860562

SN - 0378-7753

VL - 378

SP - 404

EP - 411

JO - Journal of Power Sources

JF - Journal of Power Sources

ER -