Characterisation of NiO-YSZ Porous Anode-Support for Solid Oxide Fuel Cells Fabricated by Ceramic Injection Moulding

Abstract

Ceramic injection moulding (CIM) has advantages for a cost effective fabrication of large-scale, near-net-shape products. In this work, CIM is carried out to prepare porous anode-support for solid oxide fuel cells (SOFC) applications. The CIM process started with a preparation of feedstocks by mixing powder with binder. The feedstock is then injected into the mould of desired shapes. The mouldings were subsequently undergo the removal of the binder (debinding) and, finally, sintering. It is shown that porous nickel oxide-yttria stabilized zirconia (NiO-YSZ) anode-support for SOFC were successfully prepared by CIM technique. In addition, a water-soluble based binder system, consisted mainly of polyethylene glycol (PEG), has been used in this work. This is to avoid the use of organic solvents when wax-based binder was used. Therefore, it can promote more environmentally friendly process. The removal of binder was carried out using water debinding technique. The porous anode for SOFC was subjected to systematic characterisation. The effect of processing parameters, such as powder characteristics and powder/binder ratio has been investigated. Rate of binder removal was also studied. The porous anode specimens were characterised for their properties and microstructure. It was also found that the porosity of the specimens can be controlled by adjusting the sintering temperatures and holding times.

Injection Molding of 3-3 Hydroxyapatite Composites

“…Although CIM enables the fabrication of near-net shaped ceramic implants, the technique itself does not provide a simple and fast adjustability of the total porosity and pore sizes. So far, the porosity in porous CIM was either introduced by variation of the solid loading in the ceramic-wax-feedstock [27], partial sintering [26,[29][30][31][32], direct foaming [33] or by using mixtures of coarse and fine raw powders [28]. Only for metal injection molding sacrificial templates have been used in the feedstock to generate well-defined porosities after the thermal heat treatment [34][35][36].…”

Electrical properties of Ca12Al14O33synthesised through polymer assisted deposition and glass crystallization routes

“…[1][2][3][4] The state-of-the-art electrolyte used for commercially available SOFCs is yttria-stabilized zirconia (YSZ). However, this material can only meet the oxide ion conductivity demand at a working temperature higher than 800 C. [5][6][7] Such a high temperature imposes a technical challenge for electrode material selection and their long-term stability, which therefore limits the widespread application of SOFCs and stimulates the discovery of new oxide ion conductors with high conductivities at intermediate temperature (400-700 C). To date, some new structural families, such as apatites, 8,9 scheelites, 10,11 mayenites, 12,13 melilites, [14][15][16][17] and so on, have been identied to possess pure oxide ion conductivities and have good application potential in SOFCs.…”

Phase Evolution, Electrical Properties, and Conduction Mechanism of Ca12Al14–xGaxO33 (0 ≤ x ≤ 14) Ceramics Synthesized by a Glass Crystallization Method

“…Oxide ion conductors are attracting increasing attention due to their application as electrolytes in solid-oxide fuel cells (SOFCs). − The state-of-the-art electrolyte used for commercially available SOFCs is yttria-stabilized zirconia (YSZ). However, this material can only meet the oxide-ion conductivity demand at a working temperature higher than 800 °C. − Such a high temperature imposes a technical challenge for electrode material selection and their long-term stability, which therefore limits the widespread application of SOFCs and stimulates the discovery of new oxide-ion conductors with high conductivities at intermediate temperatures (400–700 °C). To date, some new structural families, such as apatites, − scheelites, , mayenites, , and melilites, − are identified to possess pure oxide-ion conductivities and potential applications in SOFCs.…”