Synthesis and evaluation of (La0.6Sr0.4)(Co0.2Fe0.8)O3 (LSCF)–Y0.08Zr0.92O1.96 (YSZ)–Gd0.1Ce0.9O2−δ (GDC) dual composite SOFC cathodes for high performance and durability

Ko, Hyun Jun; Myung, Jae‐ha; Lee, Ji Hwan; Hyun, Sang Hwan; Chung, Jong Shik

doi:10.1016/j.ijhydene.2012.08.099

Cited by 34 publications

(13 citation statements)

References 29 publications

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“…f) Arrhenius plots of four samples: TE‐LSC (traditional LSC electrode), TE‐LSM (traditional LSM‐YSZ electrode), HE‐LSM (honeycomb LSM‐YSZ electrode), and HE‐LSC (honeycomb LSC‐YSZ electrode) with 27 wt% loading, calculated from impedance spectra tested from 650 to 850 °C. g) Relationships between polarization impedance and porosity of HE‐LSC and other electrodes at 800 °C. h) HE‐LSC was measured in three‐electrode mode at 1.5 A cm −2 for 4 h and then at 2.0 A cm −2 for 6 h at 800 °C, while TE‐LSC measured in three‐electrode mode at 0.6 A cm −2 for 1 h and then at 1.2 A cm −2 for 0.67 h at 800 °C.…”

Section: Resultsmentioning

confidence: 99%

Micro‐/Nanohoneycomb Solid Oxide Electrolysis Cell Anodes with Ultralarge Current Tolerance

Zhang

et al. 2018

Advanced Energy Materials

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This efficiency is significantly higher than that of traditional chemical approaches such as CO 2 hydrogenation or reforming. [14] In addition, operations at high temperatures can achieve larger cur rent densities due to lowering resistances, increasing productivity and reducing system size/cost.Although SOEC electrodes with perov skite structures (e.g., La 0.8 Sr 0.2 CoO 3−δ ) have the potential to tolerate current density as high as 5 A cm −2 (see the Sup porting Information for details), prac tical electrode performances degrade quickly, even at low current densities (e.g., 500 mA cm −2 ). [15,16] Such fading is mainly attributed to intensified current densi ties, causing anode delamination due to extremely high oxygen partial pressures (P O2 ) at the anode-electrolyte interface. [17,18] Notably, compared with reverse devices (solid oxide fuel cells, SOFCs), the P O2 at the anode-electrolyte interface for SOECs are commonly several times higher, [19] and further increases more than 100 times under a large current density (>1 A cm −2 ). [20] Therefore, performance degradation is even more serious for SOECs. Such high P O2 can be attributed to inherent structural defects. Traditionally, using perovskite materials (e.g., La 0.6 Sr 0.4 CoO 3±δ (LSC)) as precursors, SOEC anodes prepared by screenprinting or wet powder spraying methods [21] mainly possess spongelike structures (as shown in Figure 1a, traditional electrode LSC (TELSC) is illustrated as an example). Such spongelike anodes typically possess enor mous pores distributed randomly in space and varied widely in size. [22] Although the inherent electronic and ionic conduc tivity provided by LSC should be sufficient for operations at high temperatures (e.g., 800 °C) and large current densities (e.g., 1-2 A cm −2 ), the properties advantages are greatly lim ited by the spongelike structure due to the sluggish oxygen generation and release kinetics. Specifically, here sluggish oxygen generation is ascribed to the limited interface areas for oxygen evolution reactions (OERs). [23,24] And the poor oxygen release is caused from tortuosity factors (typically, >3 [25] ), low porosities (typically, <30%), [26] and even blocked tunnels, thus suffocating generated gases and subsequently causing anode delamination at high current densities. [22] Currently, hierarchical micro/nanostructures with well oriented nanoarrays have shown superwetting behaviors in aqueous electrolyte environments and demonstrated high efficiencies for electrolyzing (e.g., water splitting and fuel cells). [27,28] Studies in medium or high temperature systems As a clean, efficient, and promising energy conversion device, solid oxide electrolysis cell (SOEC), which can achieve transformation from electricity to chemical fuels, has captured worldwide attention. A novel biomimetic honeycomb SOEC anode with super low tortuosity factor (≈1), ground-breaking porosity (≈75%), and high structural strength, has been successfully fabricated by freeze casting and infiltrating. This honeycomb anode demonstrat...

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Section: Resultsmentioning

confidence: 99%

Micro‐/Nanohoneycomb Solid Oxide Electrolysis Cell Anodes with Ultralarge Current Tolerance

Zhang

et al. 2018

Advanced Energy Materials

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“…These challenges are mutually related to each other. Most SOFCs are operated at high temperatures to avoid massive polarisation loss at cathode components, thermal mismatch and interfacial diffusion [9]. However, the high operating temperature increases the fabrication cost.…”

Section: Challenges In Sofc Developmentmentioning

confidence: 99%

“…Dual composite cathodes have been introduced as new materials for cathode components because of several reasons. The main reason is to improve phase contiguity and interfacial coherence by creating an ideal cathode microstructure for the cathode cell component [9]. Besides, choosing the right material for dual composite cathode can help reduce the large polarisation losses and improve performance durability and cell performance [9].…”

Section: Perovskite-type Oxide-based Dual Composite Cathodementioning

confidence: 99%

“…The main reason is to improve phase contiguity and interfacial coherence by creating an ideal cathode microstructure for the cathode cell component [9]. Besides, choosing the right material for dual composite cathode can help reduce the large polarisation losses and improve performance durability and cell performance [9]. We compared a commercial composite cathode with dual composite cathodes in terms of polarisation resistance.…”

Section: Perovskite-type Oxide-based Dual Composite Cathodementioning

confidence: 99%

“…2b shows that the dual composite cathodes LSCF/GDC-YSZ and LSCF/YSZ-GDC fired at 900 °C had low electrode polarisation resistances (0.138 and 0.075 Ω cm 2 , respectively) compared with the commercial LSCF-GDC cathode (0.195 Ω cm 2 ). The polarisation resistance of a cathode can be affected by two factors: its porosity and the formation of a secondary phase [9]. The dual composite cathodes were more advantageous and promising compared with the single composite cathode.…”

Section: Perovskite-type Oxide-based Dual Composite Cathodementioning

confidence: 99%

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Perovskite-Type Oxide-Based Dual Composite Cathode for Solid Oxide Fuel Cells: A Short Review

Rahman

Azmi

2021

SSP

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A fuel cell is an electrochemical device that provides efficient power generation. Solid fuel oxide cell (SOFC) is an electrochemical device that generates electrical energy and heat from the gaseous state of fuel using an oxidant. SOFC is a highly efficient and environmentally friendly power generation technology that generates electrical energy from hydrogen gas, natural gas and other renewable fuel. The implementation of SOFCs is still facing challenges because their performance needs to be improved. Constructing cells with solid material alone is difficult because good electrical contacts between the components must be maintained. The concept of a dual composite cathode is important for the development of SOFC single cells. Introducing dual composite cathode can create an ideal cathode microstructure that can improve phase contiguity and interfacial coherence. This paper reviews the behaviour of a perovskite-type oxide-based dual composite cathode of SOFC for the selection of suitable materials and the preparation of a dual composite cathode.

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Evaluating the cathodic polarization of La0.7Sr0.3MnO3–Zr0.84−xCexY0.16O1.92 (x = 0, 0.42, 0.84) composites for SOFCs

Paydar

Gholaminezad

Shirani-Faradonbeh

et al. 2021

J Mater Sci: Mater Electron

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Synthesis and evaluation of (La0.6Sr0.4)(Co0.2Fe0.8)O3 (LSCF)–Y0.08Zr0.92O1.96 (YSZ)–Gd0.1Ce0.9O2−δ (GDC) dual composite SOFC cathodes for high performance and durability

Cited by 34 publications

References 29 publications

Micro‐/Nanohoneycomb Solid Oxide Electrolysis Cell Anodes with Ultralarge Current Tolerance

Micro‐/Nanohoneycomb Solid Oxide Electrolysis Cell Anodes with Ultralarge Current Tolerance

Perovskite-Type Oxide-Based Dual Composite Cathode for Solid Oxide Fuel Cells: A Short Review

Evaluating the cathodic polarization of La0.7Sr0.3MnO3–Zr0.84−xCexY0.16O1.92 (x = 0, 0.42, 0.84) composites for SOFCs

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