Anode-supported microtubular cells fabricated with gadolinia-doped ceria nanopowders

Gil, Victor M. S.; Gurauskis, Jonas; Campana, R.; Merino, Rosa I.; Larrea, Á.; Orera, V. M.

doi:10.1016/j.jpowsour.2010.08.093

Cited by 34 publications

(23 citation statements)

References 24 publications

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“…With humidified hydrogen (~3 % H 2 O) as a fuel and static air as an oxidant, the measured open-circuit voltages (OCVs) of the cell are 0.87, 0.82, and 0.79 Vat 500, 550, and 600°C, respectively, slightly lower than those calculated using the Nernst equation. This similar phenomenon is also reported by other researchers [29,30]. The main reason for this behavior is due to the electronic conductivity of the SDC electrolyte, which is induced by the partial reduction of Ce 4+ into Ce 3+ under the operating conditions.…”

Section: Electrochemical Propertiessupporting

confidence: 89%

Characterization and performance of cobalt-free perovskite-type La0.6Ba0.4Fe0.8Ni0.2O3 − δ cathode material for intermediate-temperature solid oxide fuel cells

Jin

Yuan

Chen

et al. 2015

Ionics

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A novel cobalt-free perovskite La 0.6 Ba 0.4 Fe 0.8 Ni 0.2 O 3 − δ (LBFN) powder was synthesized using a combustion method. The phase composition, electrical conductivity, thermal expansion coefficient (TEC), and electrochemical properties of LBFN were systematically investigated. The X-ray diffraction (XRD) results revealed that LBFN had a high chemical compatibility with Ce 0.8 Sm 0.2 O 2 − δ (SDC). The LBFN cathode exhibited a competitive electrode area-specific resistance (ASR) for the symmetric cell based on SDC electrolyte. Furthermore, the electrochemical performance of LBFN cathode could be effectively improved with the addition of the proper amount of SDC. Using the LBFN-SDC73 (7:3 in weight ratio) as a composite cathode, the Ni-SDC-supported single cell with a 25-μm-thick SDC electrolyte exhibited maximum power densities of 330, 216, and 119 mW cm −2 at 600, 550, and 500°C, respectively.

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Section: Electrochemical Propertiessupporting

confidence: 89%

Characterization and performance of cobalt-free perovskite-type La0.6Ba0.4Fe0.8Ni0.2O3 − δ cathode material for intermediate-temperature solid oxide fuel cells

Jin

Yuan

Chen

et al. 2015

Ionics

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“…It presents several technical difficulties, particularly in terms of a relatively high investment in equipment and a long time for the adjustment of processing parameters. Typical fabrication procedures for the tubular support include cold isostatic pressing, 26,27 slip-casting, 28 (Ni-SDC/ SDC/LSCF-SDC). Tubular supports were shaped by a gel-casting method based on a new and simple forming technique, which operates as a syringe.…”

Section: -15mentioning

confidence: 99%

Microtubular solid oxide fuel cells fabricated by gel-casting: the role of supporting microstructure on the mechanical properties

Morales

Laguna‐Bercero

2017

RSC Adv.

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Different cell configurations of anode-supported microtubular solid oxide fuel cells (mT-SOFCs) using samaria-doped ceria (SDC) as the electrolyte were fabricated. Several cells were processed varying the porosity and wall thickness (outer diameter) of NiO-SDC tubular supports. Suitable aqueous slurry formulations of NiO-SDC for gel-casting were prepared using agarose, as a gelling agent, and sucrose, as a pore former. The subsequent NiO-SDC anode functional layer (AFL), the SDC electrolyte and the La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3Àd -SDC cathode were deposited by spray-coating. Afterwards, the electrochemical performance of different single cells was tested under humidified hydrogen as the fuel and air as the oxidant. The mechanical strength of the supporting tubes at different processing stages (green, pre-/ post-sintering, post-reduction, post-redox cycle conditions) were also determined to study the macromechanical failure behaviour of the cells. In addition, the mechanical strength of half-cells with different porosity, sintering temperature and wall thickness in the tubular supports was also determined. For this purpose, the modulus of rupture was measured by a three point bending test. This study shows that the electrochemical properties and mechanical strength are feasible for further development of anodesupported mT-SOFCs fabricated by gel-casting.

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“…[7] Furthermore, the OCV values obtained in this study are in very good agreement with the OCVs of the most of the CGO micro-tubular SOFCs that were previously reported in literatures. [1,8,[10][11][12][13][14][15][16][17] The power density of the cells varies with the anode structure, as can be seen in Figure 2(a).…”

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confidence: 99%

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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Anode-supported microtubular cells fabricated with gadolinia-doped ceria nanopowders

Cited by 34 publications

References 24 publications

Characterization and performance of cobalt-free perovskite-type La0.6Ba0.4Fe0.8Ni0.2O3 − δ cathode material for intermediate-temperature solid oxide fuel cells

Characterization and performance of cobalt-free perovskite-type La0.6Ba0.4Fe0.8Ni0.2O3 − δ cathode material for intermediate-temperature solid oxide fuel cells

Microtubular solid oxide fuel cells fabricated by gel-casting: the role of supporting microstructure on the mechanical properties

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

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