Fabrication and performance of Pr-doped CeO2 nanorods-impregnated Sr-doped LaMnO3–Y2O3-stabilized ZrO2 composite cathodes for intermediate temperature solid oxide fuel cells

Ren, Yaoyu; Ma, Jingtao; Ai, Desheng; Zan, Qingfeng; Lin, Xin; Deng, Changsheng

doi:10.1039/c2jm35131e

Cited by 23 publications

(9 citation statements)

References 56 publications

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“…The effect of doped ceria infiltration was found to be more pronounced at lower temperatures (≈650 °C) and for low‐frequency responses related to the dissociation and diffusion of oxygen on the LSM electrode surface . Similar electrochemical activity enhancement has been reported by several authors on LSM–YSZ composite cathodes infiltrated with doped ceria . The effect of ionic conductive oxide infiltration at sufficient loading levels has been suggested to be related to the extension of TPB creating an ionic conducting path on top of the LSM particles and on top of the insulating low conducting zirconates at the LSM–YSZ interface both of which enlarged the electrochemically active portion of the electrode.…”

Section: Impregnated Cathodessupporting

confidence: 78%

“…An improvement factor (F ASR = ASR blank /ASR inf ) was used as Figure of merit accounting for the overall cathode polarization resistance reduction over the baseline "blank" cathode, where area specific resistances (ASR) of the blank electrodes (ASR blank ) and the infiltrated electrode (ASR inf ) were used as measurable variables. [141,[147][148][149][150][151] The effect of ionic conductive oxide infiltration at sufficient loading levels has been suggested to be related to the extension of TPB creating an ionic conducting path on top of the LSM particles and on top of the insulating low conducting zirconates at the LSM-YSZ interface [147] both of which enlarged the electrochemically active portion of the electrode. Such absolute values will tend to favor established materials that have had several years of optimization but the intrinsic advantage of infiltration is that initial optimization comes much easier than for bulk composites.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

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Tailoring SOFC Electrode Microstructures for Improved Performance

Connor

Yue

Savaniu

et al. 2018

Advanced Energy Materials

186

108

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The key technical challenges that fuel cell developers need to address are performance, durability, and cost. All three need to be achieved in parallel; however, there are often competitive tensions, e.g., performance is achieved at the expense of durability. Stability and resistance to degradation under prolonged operation are key parameters. There is considerable interest in developing new cathodes that are better able to function at lower temperature to facilitate low cost manufacture. For anodes, the ability of the solid oxide fuel cell (SOFC) to better utilize commonly available fuels at high efficiency, avoid coking and sulfur poisoning or resistance to oxidation at high utilization are all key. Optimizing a new electrode material requires considerable process development. The use of solution techniques to impregnate an already optimized electrode skeleton, offers a fast and efficient way to evaluate new electrode materials. It can also offer low cost routes to manufacture novel structures and to fine tune already known structures. Here impregnation methodologies are discussed, spectral and surface characterization are considered, and the recent efforts to optimize both cathode and anode functionalities are reviewed. Finally recent exemplifications are reviewed and future challenges and opportunities for the impregnation approach in SOFCs are explored.

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Section: Impregnated Cathodessupporting

confidence: 78%

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Tailoring SOFC Electrode Microstructures for Improved Performance

Connor

Yue

Savaniu

et al. 2018

Advanced Energy Materials

186

108

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“…Applications of rare earth-substituted ceria materials span the types of fields expected for these materials, from oxide ion conductors in solid oxide fuel cells, where the enhanced sinterability of fine powders into ceramics is beneficial [136,137,143,149,150], to catalysts for CO and soot oxidation, where the high surface and exposure of specific crystal faces may offer some benefits [ In terms of practical applications, the formation of composites is of relevance, and the solvothermal routes have allowed some useful possibility of accessing novel materials with practical applications. Pr-doped CeO2 nanorods were introduced into a Sr-doped LaMnO3-Y2O3-stabilized ZrO2 composite by an in situ hydrothermal growth process: this gave an enhanced performance of the material for use as an electrode in solid oxide fuel cell applications [161]. Jiang et al produced gadolinium-substituted ceria crystallites on a graphene support, by including the support material in the hydrothermal reaction [162].…”

Section: Rare Earth-substituted Ceriamentioning

confidence: 99%

“…Wang et al found that the activation energy of crystal growth is significantly dependent on the CeO2 concentration [171], and continuous In terms of practical applications, the formation of composites is of relevance, and the solvothermal routes have allowed some useful possibility of accessing novel materials with practical applications. Pr-doped CeO 2 nanorods were introduced into a Sr-doped LaMnO 3 -Y 2 O 3 -stabilized ZrO 2 composite by an in situ hydrothermal growth process: this gave an enhanced performance of the material for use as an electrode in solid oxide fuel cell applications [161]. Jiang et al produced gadolinium-substituted ceria crystallites on a graphene support, by including the support material in the hydrothermal reaction [162].…”

Section: Multi-element Substitutionsmentioning

confidence: 99%

Solvothermal Synthesis Routes to Substituted Cerium Dioxide Materials

et al. 2021

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We review the solution-based synthesis routes to cerium oxide materials where one or more elements are included in place of a proportion of the cerium, i.e., substitution of cerium is performed. The focus is on the solvothermal method, where reagents are heated above the boiling point of the solvent to induce crystallisation directly from the solution. This yields unusual compositions with crystal morphology often on the nanoscale. Chemical elements from all parts of the periodic table are considered, from transition metals to main group elements and the rare earths, including isovalent and aliovalent cations, and surveyed using the literature published in the past ten years. We illustrate the versatility of this synthesis method to allow the formation of functional materials with applications in contemporary applications such as heterogeneous catalysis, electrodes for solid oxide fuel cells, photocatalysis, luminescence and biomedicine. We pick out emerging trends towards control of crystal habit by use of non-aqueous solvents and solution additives and identify challenges still remaining, including in detailed structural characterisation, the understanding of crystallisation mechanisms and the scale-up of synthesis.

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“…Active layer of Pr 6 O 11 or Pr-doped CeO 2 was used in LNF cathode and the interfacial resistance was reduced to 1/30 that of LNF-GDC composite cathode at 800 C [33]. Compared to mechanically mixing the composite cathode and forming functionally graded cathode, a simple and cost-effective approach is to infiltrated nano catalysts on the surface of oxygen reduction electrode to improve the electrochemical performance by enlarging the length of three phase boundary (TPB) [34][35][36][37][38][39][40]. The nano catalysts were obtained by infiltrating appropriate metal salt solutions on the backbone of electrode or electrolyte with a subsequent calcination [34,[41][42][43][44][45] (CGO), showing that LCN could be beneficial for applications at temperatures below 600 C and infiltrated CGO seems to be the best choice considering long term stability [40].…”

Section: Introductionmentioning

confidence: 99%