Protonic ceramic fuel cells for high-efficiency operation with methane

Coors, W. Grover

doi:10.1016/s0378-7753(03)00072-7

Cited by 174 publications

(124 citation statements)

References 5 publications

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“…This allows the transport of water electrochemically formed at the cathode, to migrate to the anode side, where it may be consumed in fuelreforming reactions. This approach has been suggested and confirmed by Coors 342 and may become the basis for fuel cells operating with dry methane as a fuel.…”

Section: Recent Approaches Toward New Proton-conducting Materials Formentioning

confidence: 80%

Transport in Proton Conductors for Fuel‐Cell Applications: Simulations, Elementary Reactions, and Phenomenology

Kreuer¹,

Paddison²,

Spohr³

et al. 2004

ChemInform

126

193

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Section: Recent Approaches Toward New Proton-conducting Materials Formentioning

confidence: 80%

Transport in Proton Conductors for Fuel‐Cell Applications: Simulations, Elementary Reactions, and Phenomenology

Kreuer¹,

Paddison²,

Spohr³

et al. 2004

ChemInform

126

193

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“…The most promising proton conducting electrolytes are BaCe1-xYxO3-x/2 (BCY) 4,[8][9][10][11] and BaZr1-xYxO3-x/2 (BZY), [12][13][14][15][16] which exhibit high proton conductivity at intermediate temperatures (~500 C) 17 . Despite the encouraging proton conductivity of these materials, there are several issues addressed related to their chemical stability, mechanical properties and difficulties in sintering of BZY.…”

Section: -7mentioning

confidence: 99%

Effect of CO₂ Exposure on the Chemical Stability and Mechanical Properties of BaZrO₃‐Ceramics

et al. 2016

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The reactivity of BaZrO3 with CO2 has been addressed as one of the major challenges with BaZrO3-based electrolytes in proton ceramic fuel cells. Here, we present a study of the effect of CO2 exposure of BaZrO3-materials at elevated temperatures. Dense BaZr1-xYxO3-δ (x = 0, 0.05, 0.1, 0.2) and BaCe0.2Zr0.7Y0.1O2.95 ceramics were prepared by conventional sintering of powder prepared by spray pyrolysis. The Vickers indentation method was used to determine the hardness and estimate the fracture toughness of pristine materials as well as the corresponding materials exposed to CO2. Formation of BaCO3 on the surface of exposed ceramics was confirmed by X-ray diffraction and electron microcopy. The reaction resulted in formation of Ba-deficient perovskite at the exposed surface. The reaction with CO2 was most pronounced at 650 ºC compared to the other temperatures applied in the study. The reactivity was also shown to depend on the Y-content and the grain size and was most pronounced for BaZr0.9Y0.1O3-δ. The reaction with CO2 was observed to have a profound effect on the fracture toughness of the ceramics, demonstrating a depression of the mechanical stability of the materials. The results are discussed with respect to the chemical and mechanical stability of BaZrO3 materials, with particular emphasis on the composition and grain size.

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“…Moreover, the relatively high operation temperature of ceramic proton conducting fuel cells compared to e.g. PEM fuel cells enables the use of other fuels, such as biogas 3 , which is less expensive and demanding than pure hydrogen in terms of storage and transportation [4][5][6] .…”

mentioning

confidence: 99%

Influence of Sb-substitution on ionic transport in lanthanum orthoniobates

et al. 2016

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The results of ionic transport measurements for the lanthanum orthoniobate substituted with 10 and 30 mol% of antimony (LaNb0.9Sb0.1O4 and LaNb0.7Sb0.3O4) are presented and discussed. The influence of calcium co-doping on these properties has also been analysed. It has been shown that for the investigated material protonic conductivity predominates at temperatures up to 800 °C in oxidizing atmospheres, in wet conditions. Maximum observed protonic conductivity reaches ~10-4 S/cm at 800 °C (in humidified air); in the dry conditions the increasing influence of oxygen vacancies and holes is detected. Oxygen self-diffusivity has also been analysed by isotopic exchange to investigate the possible diffusion paths.

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Protonic ceramic fuel cells for high-efficiency operation with methane

Cited by 174 publications

References 5 publications

Transport in Proton Conductors for Fuel‐Cell Applications: Simulations, Elementary Reactions, and Phenomenology

Transport in Proton Conductors for Fuel‐Cell Applications: Simulations, Elementary Reactions, and Phenomenology

Effect of CO₂ Exposure on the Chemical Stability and Mechanical Properties of BaZrO₃‐Ceramics

Influence of Sb-substitution on ionic transport in lanthanum orthoniobates

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Protonic ceramic fuel cells for high-efficiency operation with methane

Cited by 174 publications

References 5 publications

Transport in Proton Conductors for Fuel‐Cell Applications: Simulations, Elementary Reactions, and Phenomenology

Transport in Proton Conductors for Fuel‐Cell Applications: Simulations, Elementary Reactions, and Phenomenology

Effect of CO2 Exposure on the Chemical Stability and Mechanical Properties of BaZrO3‐Ceramics

Influence of Sb-substitution on ionic transport in lanthanum orthoniobates

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Effect of CO₂ Exposure on the Chemical Stability and Mechanical Properties of BaZrO₃‐Ceramics