Electrochemical properties of ceria-based intermediate temperature solid oxide fuel cell using microwave heat-treated La0.1Sr0.9Co0.8Fe0.2O3−δ as a cathode

Choi, Min Sun; Lee, K.-T.; Yoon, Hyunsook; Jeon, Sang-Yun; Wachsman, Eric D.; Song, Sun-Ju

doi:10.1016/j.jpowsour.2012.07.122

Cited by 21 publications

(14 citation statements)

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“…In recent years, solid oxide fuel cells (SOFCs) have attracted attention because of their high electrical efficiency, fuel versatility and low‐pollutant emission . However, their high operating temperatures limit their application .…”

Section: Introductionmentioning

confidence: 99%

Chemical Bulk Diffusion Coefficient of a La_0.5Sr_0.5CoO_3−δ Cathode for Intermediate‐Temperature Solid Oxide Fuel Cells

Hsieh

2014

J. Am. Ceram. Soc.

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In the first part of this study, the characteristics of a La 0.5 Sr 0.5 CoO 3 -d cathode are described, including its chemical bulk diffusion coefficient (D chem ), and electrical conductivity relaxation experiments are performed to obtain experimental D chem measurements of this cathode. The second part of this study describes two methods to improve the single-cell performance of solid oxide fuel cells. One method uses a composite cathode, i.e., a mix of 30 wt% electrolyte and 70 wt% cathode; the other method uses an electrolyte-infiltrated cathode, i.e., an active ionic-conductive electrolyte with nano-sized particles is deposited onto a porous cathode surface using the infiltration method. In this work, 0.2M Ce 0.8 Sm 0.2 O 1.9 (SDC)-infiltrated La 0.5 Sr 0.5 CoO 3 -d exhibits a maximum peak power density of 1221 mW/cm 2 at an operating temperature of 700°C with a thick-film SDC electrolyte (30 lm), a NiO + SDC anode (1 mm) and a La 0.5 Sr 0.5 CoO 3 -d cathode (10 lm). The enhancement in electrochemical performances using the electrolyte-infiltrated cathode is attributed to the creation of electrolyte/cathode phase boundaries, which considerably increases the number of electrochemical sites available for the oxygen reduction reaction.

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Section: Introductionmentioning

confidence: 99%

Chemical Bulk Diffusion Coefficient of a La_0.5Sr_0.5CoO_3−δ Cathode for Intermediate‐Temperature Solid Oxide Fuel Cells

Hsieh

2014

J. Am. Ceram. Soc.

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“…The D chem and k chem values of LSCO-Cu cathode measured in this work are of the same order of magnitude as those determined with an ECR method from the literature. [49][50][51][52] The D chem and k chem of La 0.1 Sr 0. 9 and 800 • C with a small reduction step by changing oxygen partial pressure from 0.21 to 0.1 atm.…”

Section: Resultsmentioning

confidence: 99%

Double Perovskite LaSrCo_1.6Cu_0.4O_5-δCathode for IT-SOFCs with Pulsed Laser Technique Deposited Bi-Layer Electrolyte

Chen

Hsieh

et al. 2015

J. Electrochem. Soc.

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This study included two parts: (1) the structural characteristics, chemical stability, thermal expansion coefficient (TEC), chemical bulk diffusion coefficient (D chem ), chemical surface exchange coefficient (k chem ), electrochemical performance and single cell performance for LaSrCo 1.6 Cu 0.4 O 5+δ as an intermediate-temperature solid oxide fuel cells (IT-SOFC) cathode material, and (2) using a pulsed laser technique (PLD) deposited a dense Ce 0.8 Sm 0.2 O 1.9 (SDC) thin layer on thick SDC as bi-layer electrolyte and infiltrating SDC nanoparticles onto LaSrCo 1.6 Cu 0.4 O 5+δ skeleton to improve the performance of the single cell. The single cell assembling with 0.5M SDC-infiltrated LaSrCo 1.6 Cu 0.4 O 5+δ cathode and PLD-deposited SDC/SDC bilayer have shown very good performance at low operating temperatures.Currently, solid oxide fuel cells (SOFCs) have attracted a great deal of attention due to the advantages of high electrical efficiency, fuel versatility, low-pollutant emission, etc. 1-3 However, a high operating temperatures limits the application of SOFCs and lowers operating temperature to around 600 • C is primary goal in current SOFC research. Lately, research efforts have been devoted to decreasing a high operating temperature. Electrolyte materials with high ionic conductivity, such as Samaria-doped ceria (SDC), 4 bismuth oxides, 5 and lanthanum strontium gallate magnesite (LSGM) 6 have received attention for intermediate temperature SOFCs. SDC is considered one of the most promising materials for SOFCs. Its conductivity is 2-3 times greater than that of yttria stabilized zirconia (YSZ). 7 Nevertheless, one main limitation of the SDC electrolyte is the reduction of Ce 4+ to Ce 3+ induces n-type electronic conduction, which tends to decrease the open circuit voltage (OCV) and a consequent decrease in the overall power output. [8][9][10][11] The problem can be eliminated by incorporating dense and thin SDC on surface of thick SDC electrolyte as a blocking layer to improve the stability of the SDC electrolyte under the reducing environment and inhibit electronic current leakage. The pulsed laser deposition (PLD) technique is a promising method that offers better control of the deposited film properties, such as microstructures, density and stoichiometric with multi-component materials. 12,13 Furthermore, the PLD technique can operate at a low processing temperature without high post-annealing temperature, 14 which is useful for low temperature SOFC applications. Therefore, we researched lower heating temperature (600 • C) for the PLD procedure to fabricate dense and thin SDC layers on thick SDC electrolytes prepared by a solidstate reaction. In this paper, we used a simpler approach that uses a highly conductive and chemically stable on conductor electrolyte was developed by protecting a sintered SDC pellet with a thin SDC layer. The overall performance of the bilayer electrolyte turned out to be of great interest. The bilayer electrolyte was fabricated using a 1 mm thick pellet of anode-supported SD...

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“…NiO-GDC10 anode support (AS) substrates was fabricated by tape casting method [15]. The mixture slurry of NiO (Kceracell; BET¼ 4-6 m 2 g À 1 , d 50 ¼ 0.3-0.6 mm) and Ce 0.9 Gd 0.1 O 1.95 (Kceracell; BET¼ 5-8 m 2 g À 1 , d 50 ¼ 0.3-0.5 mm) was prepared in two steps.…”

Section: Materials Syntheses and Button Cell Fabricationmentioning

confidence: 99%

“…The AFL coating slurry of NiO (Kceracell; BET ¼ 8-12 m 2 g À 1 , d 50 ¼ 0.2-0.5 mm) and GDC10 was prepared in an ethanol based solvent [15]. Then, the AFL coated samples were heat-treated at 400 1C for 2 h to burn out the organics materials present in the coating slurry.…”

Section: Materials Syntheses and Button Cell Fabricationmentioning

confidence: 99%

“…GDC10 electrolyte was coated on the prepared AFL coated sample by dip coating method to form AS/AFL assembly. The electrolyte coating slurry of GDC10 (Kceracell; BET ¼ 10-15 m 2 g À 1 , d 50 ¼ 0.3-0.6 mm) was also prepared in an ethanol based solvent [15]. The GDC10 electrolyte layer was coated onto the as-prepared AS/AFL assembly by dip-coating the electrolyte coating slurry.…”

Section: Materials Syntheses and Button Cell Fabricationmentioning

confidence: 99%

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La2NiO4+δ as oxygen electrode in reversible solid oxide cells

Yoo

Choi

Hwang

et al. 2015

Ceramics International

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Electrochemical properties of ceria-based intermediate temperature solid oxide fuel cell using microwave heat-treated La0.1Sr0.9Co0.8Fe0.2O3−δ as a cathode

Cited by 21 publications

References 20 publications

Chemical Bulk Diffusion Coefficient of a La_0.5Sr_0.5CoO_3−δ Cathode for Intermediate‐Temperature Solid Oxide Fuel Cells

Chemical Bulk Diffusion Coefficient of a La_0.5Sr_0.5CoO_3−δ Cathode for Intermediate‐Temperature Solid Oxide Fuel Cells

Double Perovskite LaSrCo_1.6Cu_0.4O_5-δCathode for IT-SOFCs with Pulsed Laser Technique Deposited Bi-Layer Electrolyte

La2NiO4+δ as oxygen electrode in reversible solid oxide cells

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Electrochemical properties of ceria-based intermediate temperature solid oxide fuel cell using microwave heat-treated La0.1Sr0.9Co0.8Fe0.2O3−δ as a cathode

Cited by 21 publications

References 20 publications

Chemical Bulk Diffusion Coefficient of a La0.5Sr0.5CoO3−δ Cathode for Intermediate‐Temperature Solid Oxide Fuel Cells

Chemical Bulk Diffusion Coefficient of a La0.5Sr0.5CoO3−δ Cathode for Intermediate‐Temperature Solid Oxide Fuel Cells

Double Perovskite LaSrCo1.6Cu0.4O5-δCathode for IT-SOFCs with Pulsed Laser Technique Deposited Bi-Layer Electrolyte

La2NiO4+δ as oxygen electrode in reversible solid oxide cells

Contact Info

Product

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Chemical Bulk Diffusion Coefficient of a La_0.5Sr_0.5CoO_3−δ Cathode for Intermediate‐Temperature Solid Oxide Fuel Cells

Chemical Bulk Diffusion Coefficient of a La_0.5Sr_0.5CoO_3−δ Cathode for Intermediate‐Temperature Solid Oxide Fuel Cells

Double Perovskite LaSrCo_1.6Cu_0.4O_5-δCathode for IT-SOFCs with Pulsed Laser Technique Deposited Bi-Layer Electrolyte