High-performance cathode-supported SOFC with perovskite anode operating in weakly humidified hydrogen and methane

Chen, X.J.; Liu, Q.L.; Chan, Siew Hwa; Brandon, Nigel P.; Khor, K.A.

doi:10.1016/s1464-2859(07)70261-4

Cited by 23 publications

(8 citation statements)

References 22 publications

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“…Despite the attention given to perovskite materials for applications as anodes in hydrocarbon-fueled SOFCs, [147][148][149][150][151][152][153][154][155][156][157] their performance is still less favorable compared to Ni-YSZ cermet anodes. Aside from relatively low electrochemical activities, other issues must be addressed if perovskites are to be used in SOFC anodes, 1-3 including relatively low stability in a reducing environment, and relatively low electronic conductivity compared with metal catalysts.…”

Section: Effectsmentioning

confidence: 99%

Fundamentals of electro- and thermochemistry in the anode of solid-oxide fuel cells with hydrocarbon and syngas fuels

Hanna

Lee

Shi

et al. 2014

Progress in Energy and Combustion Science

176

110

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Section: Effectsmentioning

confidence: 99%

Fundamentals of electro- and thermochemistry in the anode of solid-oxide fuel cells with hydrocarbon and syngas fuels

Hanna

Lee

Shi

et al. 2014

Progress in Energy and Combustion Science

176

110

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“…2,4 Several studies on porous perovskite anodes (e.g. (La 0.75 Sr 0.25 )(Cr 0.5 Mn 0.5 )O 3Àd (LSCM) [5][6][7] ), or cermet anodes involving perovskite-type and ceria-based mixed conductors 6,8,9 were carried out and partly revealed low area specific resistances.…”

Section: Introductionmentioning

confidence: 99%

A novel approach for analyzing electrochemical properties of mixed conducting solid oxide fuel cell anode materials by impedance spectroscopy

Nenning

Opitz

Huber

et al. 2014

Phys. Chem. Chem. Phys.

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For application of acceptor-doped mixed conducting oxides as solid oxide fuel cell (SOFC) anodes, high electrochemical surface activity as well as acceptable electronic and ionic conductivity are crucial. In a reducing atmosphere, particularly the electronic conductivity of acceptor-doped oxides can become rather low and the resulting complex interplay of electrochemical reactions and charge transport processes makes a mechanistic interpretation of impedance measurements very complicated. In order to determine all relevant resistive and capacitive contributions of mixed conducting electrodes in a reducing atmosphere, a novel electrode design and impedance-based analysis technique is therefore introduced. Two interdigitating metallic current collectors are placed in a microelectrode, which allows in-plane measurements within the electrode as well as electrochemical measurements versus a counter electrode. Equivalent circuit models for quantifying the spectra of both measurement modes are developed and applied to simultaneously fit both spectra, using the same parameter set. In this manner, the electronic and ionic conductivity of the material as well as the area-specific resistance of the surface reaction and the chemical capacitance can be determined on a single microelectrode in a H2-H2O atmosphere. The applicability of this new tool was demonstrated in SrTi0.7Fe0.3O(3-δ) (STFO) thin film microelectrodes, deposited on single-crystalline yttria-stabilized zirconia (YSZ) substrates. All materials parameters that contribute to the polarization resistance of STFO electrodes in a reducing atmosphere could thus be quantified.

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“…Mixed ionic and electronic conduction (MIEC) is widely investigated for intermediate-temperature solid oxide fuel cell (SOFC) cathodes [1] , [2] , [3] and there is also strongly growing interest in applying reduction stable MIECs as SOFC anodes [4] , [5] , [6] , [7] , [8] , [9] , [10] . Studies on some perovskite-type porous anodes demonstrated low area specific resistance and high stability for redox cycling [4] , [5] , [6] , [7] . For ceria-based anode materials also mechanistic investigations on geometrically well-defined thin films have been performed [8] , [9] , [10] .…”

Section: Introductionmentioning

confidence: 99%

Mapping electrochemically driven gas exchange of mixed conducting SrTi0.7Fe0.3O3−δ and Ce0.8Gd0.2O1.9 thin films by 18O tracer incorporation under reducing atmosphere

et al. 2015

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Thermally and electrochemically driven 18O tracer exchange experiments in H2/H218O atmosphere were performed on SrTi0.7Fe0.3O3 − δ and Ce0.8Gd0.2O2 − δ thin films on single crystalline YSZ substrates. Noble metal current collectors were deposited on both films and electrochemically polarized during the exchange experiment. The resulting tracer distribution was analyzed by spatially resolved secondary ion mass spectrometry. Increased tracer fraction near the current collectors was found under cathodic polarization and decreased tracer fraction under anodic polarization. High cathodic bias leads to enhanced n-type electronic conductivity, which increases the extent of the electrochemically active zone.

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High-performance cathode-supported SOFC with perovskite anode operating in weakly humidified hydrogen and methane

Cited by 23 publications

References 22 publications

Fundamentals of electro- and thermochemistry in the anode of solid-oxide fuel cells with hydrocarbon and syngas fuels

Fundamentals of electro- and thermochemistry in the anode of solid-oxide fuel cells with hydrocarbon and syngas fuels

A novel approach for analyzing electrochemical properties of mixed conducting solid oxide fuel cell anode materials by impedance spectroscopy

Mapping electrochemically driven gas exchange of mixed conducting SrTi0.7Fe0.3O3−δ and Ce0.8Gd0.2O1.9 thin films by 18O tracer incorporation under reducing atmosphere

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