A dual-structured anode/Ni-mesh current collector hollow fibre for micro-tubular solid oxide fuel cells (SOFCs)

Li, Tao; Wu, Zhentao; Li, K.

doi:10.1016/j.jpowsour.2013.11.043

Cited by 41 publications

(20 citation statements)

References 20 publications

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“…Despite the possibility to modify the morphology or packing of the pore formers, the cell performance is still limited by the tortuous microstructure . Finger‐like channels in the anode and cathode have been proven experimentally to benefit the gas transport . Based on their calculations, Chen et al found that the mole fraction gradients of H 2 , CO, CH 4 , and CO are all substantially reduced by the finger‐like channels in the anode compared to the one without such channels .…”

Section: Anodesmentioning

confidence: 99%

Recent Progress on Advanced Materials for Solid‐Oxide Fuel Cells Operating Below 500 °C

et al. 2017

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Solid-oxide fuel cells (SOFCs) are electricity generators that can convert the chemical energy in various fuels directly to the electric power with high efficiency. Recent advances in materials and related key components for SOFCs operating at ≈500 °C are summarized here, with a focus on the materials, structures, and techniques development for low-temperature SOFCs, including the analysis of most of the critical parameters affecting the electrochemical performance of the electrolyte, anode, and cathode. New strategies, such as thin-film deposition, exsolution of nanoparticles from perovskites, microwave plasma heating, and finger-like channeled electrodes, are discussed. These recent developments highlight the need for electrodes with higher activity and electrolytes with greater conductivity to generate a high electrochemical performance at lower temperatures.

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Section: Anodesmentioning

confidence: 99%

Recent Progress on Advanced Materials for Solid‐Oxide Fuel Cells Operating Below 500 °C

et al. 2017

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“…Since the electrolytes and cathodes were nominally identical, it is reasonable to assume that the difference in the total cell resistance was largely due to variations in the anode polarization resistance. Although a thicker AFL can enlarge the TPB length, increase the reactive sites, and reduce the activation polarization, the fine structure and high tortuosity of AFLs may also increase gas transport resistances and thus result in increased concentration polarizations . Therefore, the electrochemical performance of the fingerlike porous anode‐supported SOFCs could be significantly enhanced by reducing the AFL thickness.…”

Section: Discussionmentioning

confidence: 99%

Optimization of anode structure for intermediate temperature solid oxide fuel cell via phase‐inversion cotape casting

et al. 2017

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A functional layer and a porous support that together constitute an anode for a solid oxide fuel cell were simultaneously formed by the phase-inversion tape casting method. Two slurries, one composed of NiO and yttria-stabilized zirconia (YSZ) powders and the other of NiO, YSZ, and graphite were cocasted and solidified by immersion in a water bath via the phase-inversion mechanism. The asformed green tape consisted of a sponge-like thin layer and a fingerlike thick porous layer, derived from the first slurry and the second slurry, respectively. The former acted as the anode functional layer (AFL), while the latter was used as the anode substrate. The AFL thickness was varied between 20 and 60 lm by adjusting the blade gap for the tape casting. Single cells based on such NiO-YSZ anodes were prepared with thin YSZ electrolytes and YSZ-(La 0.8 Sr 0.2 ) 0.95 MnO 3Àd (LSM) cathodes, and their electrochemical performance was measured using air as oxidant and hydrogen as fuel. The maximum power densities obtained at 750°C were 720, 821, and 988 mW cm À2 with the AFL thickness at 60, 40, and 20 lm, respectively. The satisfactory electrochemical performance was attributed to the dual-layer structure of the anode, where the sponge-like AFL layer provided plenty of triple-phase boundaries for hydrogen oxidation, and the fingerlike thick porous substrate allowed for facile fuel transport. The phase-inversion tape casting developed in this study is applicable to the preparation of other planar ceramic electrodes with dual-layer asymmetric structure. K E Y W O R D Sanode functional layers, NiO and yttria-stabilized zirconia anodes, phase-inversion tape casting, solid oxide fuel cells

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“…This concept is based on ceramic honeycombs/monoliths that have high strength-to-weight ratios, as well as superior compression/shear strengths 43 . A custom-designed extrusion technique, assisted by a phase inversion process, has been employed to provide better flexibility in controlling and tailoring the morphology, as has been demonstrated previously 44–47 . This technique also offers a unique capability of decreasing geometrical dimensions considerably, which conventional fabrication techniques fail to achieve.…”

Section: Introductionmentioning

confidence: 99%

Design of next-generation ceramic fuel cells and real-time characterization with synchrotron X-ray diffraction computed tomography

Heenan

Rabuni

et al. 2019

Nat Commun

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Ceramic fuel cells offer a clean and efficient means of producing electricity through a variety of fuels. However, miniaturization of cell dimensions for portable device application remains a challenge, as volumetric power densities generated by readily-available planar/tubular ceramic cells are limited. Here, we demonstrate a concept of ‘micro-monolithic’ ceramic cell design. The mechanical robustness and structural integrity of this design is thoroughly investigated with real-time, synchrotron X-ray diffraction computed tomography, suggesting excellent thermal cycling stability. The successful miniaturization results in an exceptional power density of 1.27 W cm −2 at 800 °C, which is among the highest reported. This holistic design incorporates both mechanical integrity and electrochemical performance, leading to mechanical property enhancement and representing an important step toward commercial development of portable ceramic devices with high volumetric power (>10 W cm −3 ), fast thermal cycling and marked mechanical reliability.

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A dual-structured anode/Ni-mesh current collector hollow fibre for micro-tubular solid oxide fuel cells (SOFCs)

Cited by 41 publications

References 20 publications

Recent Progress on Advanced Materials for Solid‐Oxide Fuel Cells Operating Below 500 °C

Recent Progress on Advanced Materials for Solid‐Oxide Fuel Cells Operating Below 500 °C

Optimization of anode structure for intermediate temperature solid oxide fuel cell via phase‐inversion cotape casting

Design of next-generation ceramic fuel cells and real-time characterization with synchrotron X-ray diffraction computed tomography

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