Electrical conductivities and microstructures of LSM, LSM-YSZ and LSM-YSZ/LSM cathodes fabricated on YSZ electrolyte hollow fibres by dip-coating

Agbede, Oluseye Omotoso; Hellgardt, Klaus; Kelsall, G. H.

doi:10.1016/j.mtchem.2020.100252

Cited by 14 publications

(8 citation statements)

References 57 publications

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“…For example, the maximum conductivity obtained for BMNF25 through electrochemical impedance measurements is 13 mS cm −1 at 900 °C, which is significantly lower than the conductivity of typical solid oxide electrode materials such as LSM, which is about 5.5 × 10 3 S m −1 at 800 °C. [ 34 ] Chronoamperometric measurements on this cell once again showed quantifiable ethylene and hydrogen production only at high positive applied potentials (Figure S10, Supporting Information). A maximum ethylene production rate of 277.2 µmol cm −2 h −1 at a faradaic efficiency (FE) of 20% was observed at 1.0 V for this BMNF25‐based cell while the FE for producing CO 2 was 39%.…”

Section: Resultsmentioning

confidence: 94%

Highly Stable Doped Barium Niobate Based Electrocatalysts for Effective Electrochemical Coupling of Methane to Ethylene

Denoyer

Benavidez

Garzón

et al. 2022

Adv Materials Inter

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Methane conversion into value‐added products such as olefins and aromatics is gaining increased attention in the wake of new natural gas reserve discoveries. Electrochemical oxidative coupling of methane (E‐OCM) provides better product selectivity as the product distribution can be controlled by applied potential as well as the oxide ion flux. Here a new catalyst based on Mg and Fe codoped barium niobate perovskites is reported. The prepared perovskites show excellent chemical stability in CH4‐rich environments up to 925 °C while showing methane activation properties from 600 °C. E‐OCM measurements indicate an ethylene production rate of 277 µmol cm−2 h−1 with a faradaic efficiency of 20% at 1 V and durable operation for six continuous days. X‐ray photoelectron spectroscopic measurements indicate significant Nb valency reorganization that can be the reason for its chemical stability. Nevertheless, the surface area of the catalyst is significantly lower and requires improvements in synthesis methodologies to improve catalytic activity further. The exceptional chemical stability of this perovskite material under methane exposure at high temperatures has significant importance as this material can be used as a catalyst and/or support in a wide variety of applications relevant for efficient energy conversion and storage.

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Section: Resultsmentioning

confidence: 94%

Highly Stable Doped Barium Niobate Based Electrocatalysts for Effective Electrochemical Coupling of Methane to Ethylene

Denoyer

Benavidez

Garzón

et al. 2022

Adv Materials Inter

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“…The activation energy of proton motion of the original YSZ-CeO 2 electrolyte is found to be 0.47 eV at 400-500 °C according to the Arrhenius curve, which is much lower than those of reported for YSZ (1.16 eV at 300 °C-600 °C). [41][42][43] The activation energy is the average difference between the energies of activated molecules and ordinary molecules. The much lower activation energy indicating that within this temperature range, the energy needed for proton transport from its normal state to an active state is relatively low, thus proton transport is easier for the YSZ-CeO 2 electrolyte than YSZ.…”

Section: Resultsmentioning

confidence: 99%

A novel yttrium stabilized zirconia and ceria composite electrolyte lowering solid oxide fuel cells working temperature to 400 °C

Liu,

Zuo,

et al. 2023

RSC Adv.

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“…The capability to deposit dense thin layers over porous tubular supports enables the use of SALD for the coating of dense membranes as well as other electrochemical devices such as fuel cells/electrolyzers or electrochemical membrane reactors with tailored electrodes, − where the gas separation occurs by adsorption and diffusion through the thin layer. Different ionic and protonic materials comprising more complex oxides or metals have already been deposited by ALD, − and their addition to the SALD palette for both planar and tubular depositions would be appealing for various industrial applications.…”

Section: Resultsmentioning

confidence: 99%

Custom 3D Printed Spatial Atomic Layer Deposition Manifold for the Coating of Tubular Membranes

Toldrá‐Reig

Lausecker

Weber

et al. 2022

ACS Sustainable Chem. Eng.

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The development of highly efficient membranes represents a great opportunity to significantly reduce the environmental impacts of human activities through gas separation and water filtration; they are also very attractive for process intensification when coupled to existing industrial processes. Tubular membranes have higher modularity and better pressure resistance, and they offer easier sealing than their flat counterparts. The ability to deposit thin films on their surfaces is crucial to optimize their chemical and physical properties. However, the deposition of thin films on tubular membrane supports with conventional vacuum-based deposition techniques is relatively complex, slow, and costly. In this work, the versatility of spatial atomic layer deposition (SALD) and 3D printing technologies has been combined to design and fabricate a custom SALD manifold for coating tubular substrates. SALD is a scalable deposition technique, offering high throughput at atmospheric pressure and thus can be advantageously employed to coat tubular membranes, enabling high quality thin films to be deposited at the nanoscale considerably faster than with other conventional techniques. Computational fluid dynamics calculations by means of COMSOL Multiphysics have been used to optimize this innovative SALD gas manifold. The proof-of-concept method of the tubular/cylindrical SALD manifold has been validated through successful ZnO thin film depositions performed on tubular Cu foils and porous Al2O3 tubular membrane supports, demonstrating the capability of SALD to achieve high-throughput depositions on nonplanar, complex substrates. These results open prospects for the interface engineering of membranes or electrolyzers, where precise coatings of tubular surfaces are needed.

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Electrical conductivities and microstructures of LSM, LSM-YSZ and LSM-YSZ/LSM cathodes fabricated on YSZ electrolyte hollow fibres by dip-coating

Cited by 14 publications

References 57 publications

Highly Stable Doped Barium Niobate Based Electrocatalysts for Effective Electrochemical Coupling of Methane to Ethylene

Highly Stable Doped Barium Niobate Based Electrocatalysts for Effective Electrochemical Coupling of Methane to Ethylene

A novel yttrium stabilized zirconia and ceria composite electrolyte lowering solid oxide fuel cells working temperature to 400 °C

Custom 3D Printed Spatial Atomic Layer Deposition Manifold for the Coating of Tubular Membranes

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