Single-step fabrication and characterisations of electrolyte/anode dual-layer hollow fibres for micro-tubular solid oxide fuel cells

Othman, Mohd Hafiz Dzarfan; Wu, Zhentao; Droushiotis, Nicolas; Doraswami, Uttam; Kelsall, G. H.; Li, K.

doi:10.1016/j.memsci.2010.01.050

Cited by 88 publications

(48 citation statements)

References 31 publications

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“…The mixing was further carried out for another 48 h to obtain homogeneous spinning suspension. The prepared suspensions were degassed under stirring at room temperature, loaded into stainless steel containers and extruded simultaneously through a triple-orifice spinneret [5] (the extrusion rates of the inner layer and the outer layer were 6 and 0.8 cm 3 min -1 respectively) into a tap water coagulation bath with 20 cm air-gap length.…”

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

“…The obtained dual-layer HF precursor is finally co-sintered once at high temperature as a procedure to remove polymer binder and form bounding between the ceramic materials. In our previous work, [4][5][6] a dual-layer HF support for micro-tubular SOFC, which consists of an electrolyte outer layer of approximately 80 µm supported by an asymmetric anode inner layer with 35 % finger-like voids length, was successfully fabricated using the co-extrusion/co-sintering process. A single cell that obtained after deposition of a multi-layer cathode onto the dual-layer HF produced the maximum power density of 0.59 W cm -2 at 570 o C. [6] Improvement on the structure of the dual-layer HFs was further performed by reducing the electrolyte layer thickness to as thin as 10 µm and the maximum power density of the corresponding cell markedly increased to about 1.11 W cm -2 at 600 o C. [7] Although this result has proved the potential of the dual-layer HF as a promising support for micro-tubular SOFC, the value of powder density was still slightly lower than the ramextruded anode-supported cell with similar electrolyte thickness and highly porous anode (about 1.29 W cm -2 at 600 o C).…”

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High‐Performance, Anode‐Supported, Microtubular SOFC Prepared from Single‐Step‐Fabricated, Dual‐Layer Hollow Fibers

et al. 2011

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Micro-tubular solid oxide fuel cells (SOFCs) have been developed in recent years mainly due to their high specific surface area and fast thermal cycling. Previously, the fabrication of micro-tubular SOFC was achieved through multiple-step processes. [1][2][3] A support layer, for example anode-support, is first prepared and pre-sintered to provide mechanical strength to the fuel cell. The electrolyte layer is then deposited and sintered prior to the final coating of cathode layer. Each step involves at least one high temperature heat treatment, making the cell fabrication time-consuming and costly, with unstable control over cell quality. For a more economical fabrication of micro-tubular SOFC with reliability and flexibility in quality control, an advanced dry-jet wet extrusion technique, i.e. a phase-inversion-based coextrusion process, is developed. Using this technique, a dual-layer electrolyte/electrode (either anode or cathode) hollow fibre (HF) can be formed in a single step. Generally, the electrolyte and electrode materials are separately mixed with solvent and polymer binder to form the outer and inner layer spinning suspensions, respectively, before simultaneously co-extruded through a triple-orifice spinneret, passing through an air gap and finally into a non-solvent external coagulation bath. In the mean time, a stream of non-solvent internal coagulant is supplied through the central bore of the spinneret. Thickness of the two layers are largely determined by the design of the spinneret and can be adjusted by the corresponding extrusion rate, while the macrostructure or morphology of the prepared HF precursor can be controlled 1 Submitted to by adjusting co-extrusion parameters such as suspension viscosity, air gap, flow rate of internal coagulant, etc. The obtained dual-layer HF precursor is finally co-sintered once at high temperature as a procedure to remove polymer binder and form bounding between the ceramic materials. In our previous work, [4][5][6] a dual-layer HF support for micro-tubular SOFC, which consists of an electrolyte outer layer of approximately 80 µm supported by an asymmetric anode inner layer with 35 % finger-like voids length, was successfully fabricated using the co-extrusion/co-sintering process. A single cell that obtained after deposition of a multi-layer cathode onto the dual-layer HF produced the maximum power density of 0.59 W cm -2 at 570 o C.[6] Improvement on the structure of the dual-layer HFs was further performed by reducing the electrolyte layer thickness to as thin as 10 µm and the maximum power density of the corresponding cell markedly increased to about 1.11 W cm -2 at 600 o C. [7] Although this result has proved the potential of the dual-layer HF as a promising support for micro-tubular SOFC, the value of powder density was still slightly lower than the ramextruded anode-supported cell with similar electrolyte thickness and highly porous anode (about 1.29 W cm -2 at 600 o C).[8] One of the possible major reasons for the lower power output is the less effectiv...

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Section: Methodsmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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High‐Performance, Anode‐Supported, Microtubular SOFC Prepared from Single‐Step‐Fabricated, Dual‐Layer Hollow Fibers

et al. 2011

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“…The prepared spinning dope mixture was extruded using a triple orifice spinneret to form dual layer hollow fibre membranes as stated detail elsewhere [17]. The dimension of the spinneret is shown in Fig.…”

Section: Spinning Of Dual Layer Hollow Fibrementioning

confidence: 99%

Fabrication of Dual Layer Hollow Fibre Membranes for Photocatalytic Degradation of Organic Pollutants

Dzinun¹,

Othman²,

Ismail³

et al. 2015

IJCEA

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Abstract-In recent years, the membrane photocatalytic reactor (MPR) systems have attracted much attention due to their promising function in treating organic pollutant and filtering clean water. Suspended photocatalyst titanium dioxide (TiO 2 ) particle always become a problematic in hybrid MPR system due to membrane fouling and TiO 2 loss. In the past few years, considerable attention has been paid to immobilize TiO 2 nanoparticles on various materials. Since ultraviolet (UV) source and TiO 2 are required for the photocatalytic reaction, thus, it is crucial to immobilize high concentration of TiO 2 on the outer surface of the polymeric membrane support. By using co-extrusion approach, a dual layer hollow fibre (DLHF) membrane was fabricated. The effect of additives on the dope polymer solutions and membrane morphologies of DLHF were investigated using of scanning electron microscopy (SEM). The SEM results showed that DLHF membranes have a good adhesion between layers with no delamination.Index Terms-Dual-layer hollow fibre membrane, co-extrusion, photocatalytic degradation, Titanium dioxide.

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“…The bending strength (F) of the hollow fibres was determined by the bending test using an Instron Model 4466 provided with a load cell for 1 kN and was calculated using Equation (1) (Cernica, 1977;Othman et al, 2010).…”

Section: Characterisations Of Asymmetric Al2o3 Hollow Fibresmentioning

confidence: 99%

Characterisation of Asymmetric Alumina Hollow Fibres: Application for Hydrogen Permeation in Composite Membranes

Terra

Lemos

Silva

et al. 2016

Braz. J. Chem. Eng.

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-Asymmetric alumina hollow fibres produced by the phase inversion/sintering method present advantages in that high area/volume ratios and low mass transfer resistances are achieved due to the geometric configuration and the pore size distribution, respectively. Here we characterise hollow fibres that were prepared with different internal coagulants and at different sintering temperatures. Additionally, a palladium membrane was deposited on these different hollow fibres and hydrogen permeabilities through them were compared. More fingers were obtained when a mixture of solvent with water was used as internal coagulant, instead of pure water. At the same sintering temperature, nitrogen permeance through the fibre was increased 5-fold when a mixture of solvent and water was used as internal coagulant instead of pure solvent, and the water flux was increased 7-fold. The decrease in the sintering temperature increased the water permeance through the fibre from 21.4 to 63.9 L h when using a more permeable hollow fibre as substrate. These results elucidate better conditions to fabricate hollow fibres that present low mass transfer resistances.

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Single-step fabrication and characterisations of electrolyte/anode dual-layer hollow fibres for micro-tubular solid oxide fuel cells

Cited by 88 publications

References 31 publications

High‐Performance, Anode‐Supported, Microtubular SOFC Prepared from Single‐Step‐Fabricated, Dual‐Layer Hollow Fibers

High‐Performance, Anode‐Supported, Microtubular SOFC Prepared from Single‐Step‐Fabricated, Dual‐Layer Hollow Fibers

Fabrication of Dual Layer Hollow Fibre Membranes for Photocatalytic Degradation of Organic Pollutants

Characterisation of Asymmetric Alumina Hollow Fibres: Application for Hydrogen Permeation in Composite Membranes

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