Interfacial modification of La0.80Sr0.20MnO3−δ–Er0.4Bi0.6O3 cathodes for high performance lower temperature solid oxide fuel cells

Lee, Jun Young; Jung, Doh Won; Yoon, Hyunsook; Lidie, Ashley A.; Camaratta, Matthew; Wachsman, Eric D.

doi:10.1016/j.jpowsour.2012.08.004

Cited by 59 publications

(72 citation statements)

References 51 publications

(33 reference statements)

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“…(d) 1, 5 ). Simultaneously, the Ea for ESB-LBSM cathode is close to ESB-La 0.8 Sr 0.2 MnO 3-δ which is 1.23 eV based ESB electrolyte reported by Lee et al 23 For most of the bismuth oxides stabilized with lanthanide dopants (Dy, Ho, Er, Tm, and Yb), the conductivity activation energy (Ea) increases below 600 °C due to an order-disorder transition of the oxygen sublattice. 5,23 As R o is dominated by the electrolyte resistance, the conductivity of the SNDC|ESB bilayer electrolyte film under fuel cell conditions can be estimated based on the R o values and film thickness (…”

supporting

confidence: 80%

“…The typical I-V and power density curves for the single cell NiO-SNDC|SNDC|ESB|ESB-LBSM at 450-650 °C is shown in Figure 3 18 and SDC|YSB (0.887 V at 500 °C) 17 . Moreover, the current relsuts show higher MPDs than many ceria-bismuth bilayer electrolytes reports, such as SDC|YSB (571 mW cm -2 at 600 °C), 17 SDC|YSB (381 mW cm -2 at 650 °C), 2 GDC|ESB (588 mW cm -2 at 650 °C), 3 GDC|ESB (667 mW cm -2 at 600 °C) 23 . Some studies show higher OCV values with lower MPDs, while some display higher MPDs accompanied with lower OCVs.…”

mentioning

confidence: 80%

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High performance ceria–bismuth bilayer electrolyte low temperature solid oxide fuel cells (LT-SOFCs) fabricated by combining co-pressing with drop-coating

Hou

Qian

et al. 2015

J. Mater. Chem. A

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This is an Accepted Manuscript, which has been through the Royal Society of Chemistry peer review process and has been accepted for publication.Accepted Manuscripts are published online shortly after acceptance, before technical editing, formatting and proof reading. Using this free service, authors can make their results available to the community, in citable form, before we publish the edited article. We will replace this Accepted Manuscript with the edited and formatted Advance Article as soon as it is available.You can find more information about Accepted Manuscripts in the Information for Authors.Please note that technical editing may introduce minor changes to the text and/or graphics, which may alter content. Isovalent cation stabilized bismuth oxides (SBO) are particularly attractive because of their superior ionic conductivity at LTs, which is about 1-2 orders of magnitude higher than those of zirconia-based electrolytes. 1,[5][6][7][8] However, bismuth-based materials could decompose to metallic bismuth in the presence of the reducing gas such as H 2 or CH 4 .9 Therefore, they could not be used at the fuel side which makes it a poor choice by itself as an electrolyte for SOFCs. In contrast, the bismuth-based materials can be exposed to the air side since it is intended to be a pure oxide ionic conductor and thermodynamically stable under oxygen partial pressure down to 10 -13 atm. 2,6,10,11 To date, many works were focused on the ceria-based electrolytes to lower the operating temperature.4, 12-14 Virkar et al 15,16 have pioneeringly proposed a two-layer fuel cell electrolyte structure with YSZ used as a blocking layer to prevent ceria reduction, and a doped ceria (DCO) layer on the reducing side to improve the thermodynamic stability of the bismuth oxide layer, by shielding it from very low 2 O P .Several studies have demonstrated that the electrochemical properties of ceria-based SOFCs can be effectively improved using the ceria/bismuth oxide bilayer electrolyte structure. 1-3, 5-7, 10, 17-20 Though various fabrication methods were employed for ceria-bismuth bilayer electrolyte cells, such as spin coating, DC (Direct Current) magnetron sputtering, pulsed laser deposition (PLD) and so on, 2, 3, 6, 17, 18 most of which required advanced small-scale techniques and the operating temperature was relative high above 550 °C. Therefore, the low cost fabrication of SBO electrolyte film fuel cells with reasonable performance at LT down to 450 °C still remains a challenge. Furthermore, limited compatible cathodes for the ceria-bismuth bilayer electrolyte cells were developed, though Ahn et al 18 exploited the cathode Er 0.4 Bi 1.6 O 3 -Bi 2 Ru 2 O 7 (ESB-BRO7) for GDC|ESB bilayer electrolyte and achieved very high electrochemical performance, which contains the noble metallic element Ru. Then seeking new low cost cathode materials for ceria-bismuth bilayer electrolyte is imperative. Here a simple low cost fabrication technique combining one-step copressing with drop-coating was developed for the anode-DCO-SBO...

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supporting

confidence: 80%

mentioning

confidence: 80%

High performance ceria–bismuth bilayer electrolyte low temperature solid oxide fuel cells (LT-SOFCs) fabricated by combining co-pressing with drop-coating

Hou

Qian

et al. 2015

J. Mater. Chem. A

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“…The lowest values of polarization resistance are found for BYO backbone and attributed to the higher ionic conductivity and surface exchange coefficient k s of BYO compared to YSZ and CGO. 26,42 In order to identify the different rate-limiting-steps involved in the oxygen reduction reactions, the impedance spectra were acquired as a function of pO 2 . The spectra for LSM deposited on YSZ backbone show two different contributions at low (LF) and high frequencies (HF), being the low frequency step dominant at reducing pO 2 (Fig.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

“…These values are comparable to those reported previously for LSM composite electrodes. 26,29,42 Table 1. Area specific resistances at 650 ºC and activation energies for the LSM electrodes after annealing at different temperatures.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

“…3 In this sense, various fabrication techniques have been investigated to obtain increased TPB lengths: (i) nanostructures LSM cathodes, including nanoparticles, nanofibers and thin films; [10][11][12][13][14][15][16] (ii) polymer templating methods to increase the porosity of the electrodes; [17][18][19] (iii) the infiltration of LSM into electrolyte backbones; [20][21][22] and (iv) composites of LSM with highly conductive materials, such as Bi 2 O 3-δ . [23][24][25][26] The preparation of electrodes via infiltration of a cation solution into a porous electrolyte backbone is one of the most effective methods used to increase the TPB area and to improve the cathode efficiency at lower temperature, especially in lab-scale research.…”

Section: Introductionmentioning

confidence: 99%

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Novel Microstructural Strategies To Enhance the Electrochemical Performance of La_0.8Sr_0.2MnO_3−δ Cathodes

Santos‐Gómez

Losilla

Martı́n

et al. 2015

ACS Appl. Mater. Interfaces

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Solid oxide fuel cells (SOFCs) are one of the most efficient technologies for direct conversion of fuels to electricity. La 0.8 Sr 0.2 MnO 3-δ (LSM) is the cathode material most widely used in SOFCs [1], however, LSM exhibits high activation energy for oxygen reduction reaction (ORR) and low ionic conductivity, which limits its application at reduced temperatures. In this material the electrochemically active reaction sites are restricted to the triple-phase boundary (TPB) near the electrolyte/electrode interface, where the electrolyte, air and electrode meet. Different strategies have been investigated to enlarge the TPB area of LSM, such as the production of nanocrystalline powders by precursor routes, preparation of composites by infiltration methods and thin films [2][3][4].Here we present and compare innovative procedures to extend the TPB of LSM in contact with yttria-stabilized zirconia electrolyte: i) nanocrystalline LSM films deposited by spray-pyrolysis on polished YSZ electrolyte; ii) the addition of polymethyl methacrylate microspheres as pore formers during the spray-pyrolysis deposition to further increase the porosity of these films and ( The most remarkable peculiarity of this novel preparation method, compared to the traditional impregnation, is the formation of LSM thick film of 500 nm on the electrode surface ( Fig. 1), which improves the electrical conductivity of the composite cathode. Thus, the optimization of this novel method would be an alternative to the classical infiltration with several advantages for the industry of planar SOFCs allowing the deposition of a wide variety of ceramic films over large areas with more uniform distribution of the catalyst, lower cost and only one deposition step is required to form the electrode.The morphology and electrochemical performance of the electrode have been investigated by scanning electron microscopy and impedance spectroscopy. Very low values of area specific resistance were obtained ranging from 1.4 Ωcm 2 for LSM deposited on polished YSZ to 0.06 Ωcm 2 for LSM deposited onto BYO backbone at a measured temperature of 650 ºC. This electrodes exhibit high performance even after annealing at 950 ºC making them interesting for applications at intermediate temperatures.Keywords: Fuel cells; La 0.8 Sr 0.2 MnO 3-δ ; spray-pyrolysis, microstructure, impedance spectroscopy.

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Low‐Temperature Micro‐Solid Oxide Fuel Cells with Partially Amorphous La_0.6Sr_0.4CoO_3‐δ Cathodes

Evans

Martynczuk

Stender

et al. 2014

Advanced Energy Materials

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Partially amorphous La 0.6 Sr 0.4 CoO 3-δ (LSC) thin-fi lm cathodes are fabricated using pulsed laser deposition and are integrated in free-standing micro-solid oxide fuel cells (micro-SOFC) with a 3YSZ electrolyte and a Pt anode. A low degree of crystallinity of the LSC layers is achieved by taking advantage of the miniaturization of the cells, which permits low-temperature operation (300-450 °C). Thermomechanically stable micro-SOFC are obtained with strongly buckled electrolyte membranes. The nanoporous columnar microstructure of the LSC layers provides a large surface area for oxygen incorporation and is also believed to reduce the amount of stress at the cathode/ electrolyte interface. With a high rate of failure-free micro-SOFC membranes, it is possible to avoid gas cross-over and open-circuit voltages of 1.06 V are attained. First power densities as high as 200-262 mW cm −2 at 400-450 °C are achieved. The area-specifi c resistance of the oxygen reduction reaction is lower than 0.3 Ω cm 2 at 400 °C around the peak power density. These outstanding fi ndings demonstrate that partially amorphous oxides are promising electrode candidates for the next-generation of solid oxide fuel cells working at low-temperatures.

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Interfacial modification of La0.80Sr0.20MnO3−δ–Er0.4Bi0.6O3 cathodes for high performance lower temperature solid oxide fuel cells

Cited by 59 publications

References 51 publications

High performance ceria–bismuth bilayer electrolyte low temperature solid oxide fuel cells (LT-SOFCs) fabricated by combining co-pressing with drop-coating

High performance ceria–bismuth bilayer electrolyte low temperature solid oxide fuel cells (LT-SOFCs) fabricated by combining co-pressing with drop-coating

Novel Microstructural Strategies To Enhance the Electrochemical Performance of La_0.8Sr_0.2MnO_3−δ Cathodes

Low‐Temperature Micro‐Solid Oxide Fuel Cells with Partially Amorphous La_0.6Sr_0.4CoO_3‐δ Cathodes

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Interfacial modification of La0.80Sr0.20MnO3−δ–Er0.4Bi0.6O3 cathodes for high performance lower temperature solid oxide fuel cells

Cited by 59 publications

References 51 publications

High performance ceria–bismuth bilayer electrolyte low temperature solid oxide fuel cells (LT-SOFCs) fabricated by combining co-pressing with drop-coating

High performance ceria–bismuth bilayer electrolyte low temperature solid oxide fuel cells (LT-SOFCs) fabricated by combining co-pressing with drop-coating

Novel Microstructural Strategies To Enhance the Electrochemical Performance of La0.8Sr0.2MnO3−δ Cathodes

Low‐Temperature Micro‐Solid Oxide Fuel Cells with Partially Amorphous La0.6Sr0.4CoO3‐δ Cathodes

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Product

Resources

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Novel Microstructural Strategies To Enhance the Electrochemical Performance of La_0.8Sr_0.2MnO_3−δ Cathodes

Low‐Temperature Micro‐Solid Oxide Fuel Cells with Partially Amorphous La_0.6Sr_0.4CoO_3‐δ Cathodes