Electrochemical characteristics of LSCF–SDC composite cathode for intermediate temperature SOFC

Fu, Chuankai; Sun, Kening; Zhang, Naiqing; Chen, Xinbing; Zhou, Dengwang

doi:10.1016/j.electacta.2007.01.001

Cited by 221 publications

(99 citation statements)

References 23 publications

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“…As the result of much higher surface area for oxygen exchange, the effect of rate determining surface exchange kinetics can be limited. Canales-Vazquez et al [33] [34][35][36], LNF cathode [37] and LSM-YSZ composites [38]. All of these materials exhibit much higher electronic conductivities, so results obtained for STFs are interesting.…”

Section: Resultsmentioning

confidence: 93%

Structural and electrical properties of Sr(Ti, Fe)O3-δ materials for SOFC cathodes

et al. 2012

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Doped strontium titanates are very versatile materials. Iron doped SrTiO 3 can be used, for example, as a material for resistive gas sensors and fuel cell electrodes. In this paper, two compositions based on Fe doped SrTiO 3 were studied as possible candidates for cathode application in SOFCs. Namely, SrTi 0.65 Fe 0.35 O 3 and SrTi 0.50 Fe 0.50 O 3 were examined. A chemical reactivity between electrode and YSZ electrolyte material was investigated, since Sr containing cathode materials in contact with YSZ electrolyte are prone to form insulating phases. Electrical conductivity of bulk samples showed relatively low total conductivities of 0.4 S cm −1 and~2 S cm −1 for STF35 and STF50 respectively. Suitability for cathode application was studied by Electrochemical Impedance Spectroscopy in a symmetrical electrode configuration. Area specific resistance (ASR) was determined in the temperature range from 600°C to 800°C. At 790°C samples show polarization ASR of approximately 0.1Ω cm 2 . It can be expected that further reduction of electrode ASR can be obtained by introduction of ceria barrier layer and tailoring of the electrode microstructure.

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Section: Resultsmentioning

confidence: 93%

Structural and electrical properties of Sr(Ti, Fe)O3-δ materials for SOFC cathodes

et al. 2012

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“…The negligible change of the contact convex rings on the pre-sintered LSCF/GDC interface is consistent with the excellent mixed electronic and ionic conductivities and high electrocatalytic activity of LSCF perovskite materials for the O 2 reduction reactions at intermediate temperatures. [50][51][52][53][54][55][56] This in turn indicates that O 2 reduction reaction would occur mainly in the bulk of the electrodes away from the electrode/electrolyte interface. Figure 12a is the impedance responses of the O 2 reduction on the in situ assembled LSCF electrode on GDC electrolyte under a cathodic current of 1000 mAcm −2 at 800 • C. Despite the high polarization current, the electrode impedance of the in situ assembled LSCF behaves very similarly to that of the pre-sintered LSCF.…”

Section: Resultsmentioning

confidence: 99%

Thermally and Electrochemically Induced Electrode/Electrolyte Interfaces in Solid Oxide Fuel Cells: An AFM and EIS Study

Jiang

2015

J. Electrochem. Soc.

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In high temperature solid oxide fuel cells (SOFCs), electrode/electrolyte interfaces play a critical role in the electrocatalytic activity and durability of the cells. In this study, thermally and electrochemically induced electrode/electrolyte interfaces were investigated on pre-sintered and in situ assembled (La 0.8 Sr 0.2 ) 0.90 MnO 3 (LSM) and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) electrodes on Y 2 O 3 -ZrO 2 (YSZ) and Gd 0.2 Ce 0.8 O 2 (GDC) electrolytes, using atomic force microscopy (AFM) and electrochemical impedance spectroscopy (EIS). The results indicate that thermally induced interface is characterized by convex contact rings with depth of 100-400 nm and diameter in agreement with the particle size of pre-sintered LSM and LSCF electrodes, while the electrochemically induced interfaces under cathodic polarization conditions on in situ assembled electrodes are characterized by particle-shaped contact marks or clusters (50-100 nm in diameter). The number and distribution of contact clusters depend on the cathodic current density as well as the electrode and electrolyte materials. The contact clusters on the in situ assembled LSCF/GDC interface are substantially smaller than that on the in situ assembled LSM/GDC interface likely due to the high mixed ionic and electronic conductivities of LSCF materials. The results show that the electrochemically induced interface is most likely resulting from the incorporation of oxygen species and cation interdiffusion under cathodic polarization conditions. However, the electrocatalytic activity of electrochemically induced electrode/electrolyte interfaces is comparable to the thermally induced interfaces for the O 2 reduction reaction under SOFC operation conditions. © The Author Solid oxide fuel cell (SOFC) is one of the most efficient technologies for the conversion of chemical energy of fuels such as hydrogen and natural gas directly into electrical power. It employs a solid oxide electrolyte such as yttria-stabilized zirconia (YSZ) that serves as an ionic conductor in the temperature range between 600• C to 1000• C. The electrolyte separates the cathode from the anode and conducts oxygen ions from the cathode to the anode where they react electrochemically with the fuel. Electrons are then released to an external circuit, which provides a useful source of electrical power. The electrochemical reactions such as O 2 reduction at the cathode and H 2 oxidation at the anodes occur at the electrode/electrolyte interface regions.1-3 Thus, in SOFCs, electrode/electrolyte interfaces play a vital role in the mechanism and kinetics of the electrochemical reactions and in the fundamental understanding of the relationship between the electrochemical processes and microstructure.4-10 The cell performance and durability also depend strongly on the microstructural change at the interface under SOFC operation conditions. 11,12Lanthanum strontium manganite (LSM) is one of the most common cathode materials for SOFCs because of high electrical conductivity, good thermal and chem...

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“…A-site replacement affects mainly the amount of sorbed oxygen, whereas B-site replacement influences the nature of the sorbed oxygen [115]. They have exhibited effective catalytic applications for combustion [116], natural gas PO [117], SR [118] and electrochemical reactions for SOFCs [119][120][121][122]. They have also shown great promise for ATR of hydrocarbons due to their well-known thermal stability in a broad range of temperature as well as high oxygen storage capacity (OSC) and oxygen ion conductivity [74].…”

Section: Perovskitesmentioning

confidence: 99%

Recent Advances in Hydrogen Production Via Autothermal Reforming Process (ATR): A Review of Patents and Research Articles

Nahar¹,

Dupont²

2013

CHENG

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Abstract:This review examines recent patents and research articles in autothermal reforming (ATR) of fossil fuels like gasoline, diesel, JP-8 along with renewable fuels such as methanol, ethanol, glycerol, butanol, bio-oils and biodiesel into H 2 gas. The focus of the research was the recent developments in terms of ATR reformer design, ATR fuel processors, reformer start up, and reforming catalysts to determine the opportunities for R&D in this area. The production of H 2 by ATR of fossil fuels has been widely investigated; several catalytic studies based on various noble and non-precious metals like Rh and Ni are available, restricting new investigations. In contrast, H 2 production from bio feedstock like bio-oils, biodiesel, ethanol, and butanol are very recent and offer considerable room for further investigation..

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Electrochemical characteristics of LSCF–SDC composite cathode for intermediate temperature SOFC

Cited by 221 publications

References 23 publications

Structural and electrical properties of Sr(Ti, Fe)O3-δ materials for SOFC cathodes

Structural and electrical properties of Sr(Ti, Fe)O3-δ materials for SOFC cathodes

Thermally and Electrochemically Induced Electrode/Electrolyte Interfaces in Solid Oxide Fuel Cells: An AFM and EIS Study

Recent Advances in Hydrogen Production Via Autothermal Reforming Process (ATR): A Review of Patents and Research Articles

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