LSM Microelectrodes: Kinetics and Surface Composition

Norrman, Kion; Jacobsen, Torben; Wu, Yan‐Chao; Mogensen, Mogens Bjerg

doi:10.1149/2.0361510jes

Cited by 15 publications

(15 citation statements)

References 25 publications

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“…A SiO2 scavenger (such as basic oxides of Sr or La) is probably the most effective means of combatting segregation at the 3PBs 46 . It might also be expected that this segregated SrO would react with the SiO2 impurities discussed above at the 3PB, and this actually seems to happen, but it does not block the oxygen reduction or the oxide ion oxidation totally 22 .…”

Section: Segregation and Contamination At The Interfacementioning

confidence: 99%

“…The active oxygen electrode material generally has perovskite or related structure, Figure 2d-f. For poorly ionic conducting oxygen electrodes, such as SrO doped LaMnO3 (LSM), the 3PB path dominates under anodic polarisation, gradually shifting to the 2PB path with cathodic polarisation 22 , due to the reduction of Mn, which increases the oxygen vacancy concentration. For MIEC oxygen-electrode materials the 2PB pathway dominates.…”

Section: Box 1 Soc Electrochemical Reaction Mechanismsmentioning

confidence: 99%

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Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

et al. 2016

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Section: Segregation and Contamination At The Interfacementioning

confidence: 99%

Section: Box 1 Soc Electrochemical Reaction Mechanismsmentioning

confidence: 99%

Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

et al. 2016

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“…The maximum power density of (≈170 mW cm −2 ) was reached at 470 °C, which is a low operating temperature as compared to previous reports . Such low operating temperatures greatly reduce deleterious electrochemical reactions at the YSX–Ni interface as has been reported for high temperature ( T > 750 °C) SOFC's, thus yielding longer lifetimes for the 3D porous thin film SOFC.…”

mentioning

confidence: 59%

3D Porous Nickel Anode for Low Temperature Thin Solid Oxide Fuel Cell Applications

Ebrahim

Yeleuov

Ignatiev

2017

Adv Materials Technologies

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anode as the support structure for the cell, with an electrolyte thin film deposited on it. [6][7][8] The deposited thin film electrolyte layer should be dense and pore free to prevent gas from leaking through it; also to prevent the shorting of the cell. It is also preferred that highly porous electrodes be used, in order to further increase the gas transport rate.SOFCs which utilize the anode or cathode (composed of oxide materials) as the support for the cell do show several weaknesses, as compared to traditional high operating temperature SOFCs. These include: weak structure, brittleness, internal differences in thermal expansion (during the reduction process of the oxide anode), high fabrication temperatures, low cell output power density, and high fabrication cost. [9,10] In addition to the mentioned shortcomings, the issue of preventing fuel leaks is the most challenging for the reported thin electrolyte SOFCs.In the present work, the fuel cell's operating temperature (<450 °C), physical structure, and output power density were all enhanced, while the fabrication costs were lowered remarkably. This was achieved by the fabrication of a low-cost 3D porous nickel anode which possesses a very flat surface with nanopores onto which a dense continuous thin film electrolyte layer can be deposited to form the TFSOFC, the schematic of which is shown in Figure 1. The fabricated porous nickel anode can be machined, soldered or welded, and does not require a reduction process.A 3D porous nickel anode with a flat nanoporous surface was fabricated using the process shown in Figure 2a, by thoroughly mixing commercial nickel powder (particle size between 1 and 3 µm) with an ammonium bicarbonate (particle size of from 100 to 500 nm) proppant. The mixing of the two components must be thorough; therefore, it is typically performed by mechanical mixing and ball milling procedures. The resulting mixture (nickel powder and proppant) is then pressed into a parallel faced ≈1 mm thick square tablet at 5000 psi (see Figure 2b). The tablets can be pressed into any shape required for an anode, and fuel channels can be included in the processing as shown in insert of Figure 2b. The tablet of pressed nickel powder/proppant is then loaded into a high temperature tubular furnace and sintered at 800 °C for 2 h in an ambient hydrogen/argon atmosphere (1:9%).The surface of the sintered nickel sample is microscopically rough and contains average pores sizes of several hundred nm. Such a surface, despite having the required pore structure, is much too rough to be effectively coated with a uniformly thin A simple fabrication process for a 3D porous nickel anode for a thin film solid oxide fuel cell (SOFC) is developed. The 3D porous nickel anode is fabricated using a metal/proppant mixing method followed by pressing and heat treatment. The anode bulk possesses a high porosity which is required for efficient delivery of fuel to the cell. Following fabrication, the anode's surface is processed by means of mechanical, chemical, and ion etching to...

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“…The microelectrodes were subsequently sintered for 5 h at 1000 °C in air [5]. SEM and atomic force microscopy (AFM) images (Figure 4) of the as-sintered microelectrodes show the formation of particles with a different morphology at the edge of the microelectrodes and otherwise a uniform microelectrode surface of fine-grained LSM.…”

Section: Sample Preparationmentioning

confidence: 99%

“…The present report explains the main principles of the conductance mapping technique and demonstrates how micron-sized features in the conductance images correlate well with features recorded by time-of-flight secondary ion mass spectrometry (TOF-SIMS) imaging and microstructural features observed in scanning electron microscopy (SEM) images thus validating the observations in the CAHT-SPM. Previously, lanthanum strontium manganite (LSM) microelectrodes on yttria-stabilized zirconia (YSZ) were characterized by impedance spectroscopy and cyclic voltammetry in a CAHT-SPM [5], microstructurally by SEM [5] and chemically by TOF-SIMS [6]. Here they are used as an example to demonstrate the correlation between electrical, chemical and microstructural properties.…”

Section: Introductionmentioning

confidence: 99%

High temperature conductance mapping for correlation of electrical properties with micron-sized chemical and microstructural features

Norrman

Jacobsen

2016

Ultramicroscopy

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LSM Microelectrodes: Kinetics and Surface Composition

Cited by 15 publications

References 25 publications

Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

3D Porous Nickel Anode for Low Temperature Thin Solid Oxide Fuel Cell Applications

High temperature conductance mapping for correlation of electrical properties with micron-sized chemical and microstructural features

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