The Performance Of Spinel-Based Interconnect Coating And Cathode-Side Contact Layer For Solid Oxide Fuel Cell

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The Performance Of Spinel-Based Interconnect Coating And Cathode-Side Contact Layer For Solid Oxide Fuel Cell

The development of low-cost raw materials and process for achieving high-quality cathode-side interconnect coating and contact layer is critical to the commercial deployment of solid oxide fuel cell. The transitional metal-containing spinels are widely used as coating materials for protecting ferritic stainless steel interconnects. This study focuses on developing a cost-effective approach to achieve high-performance interconnect coatings and investigating spinel-based materials to replace conventional perovskite contact at the cathode-interconnect interface. A mixture of Fe+CoO or Co+Mn3O4 is applied on the interconnect via screen printing and then thermally converted into a dense and adherent spinel layer in air at the elevated temperature. The synthesized layers inhibit the Cr2O3 scale growth on the stainless steel and reduce the scale ASR. When commercial reactive element-free alloys are used as the interconnect materials, Ce element can be readily added into the spinel, further improving the behavior of the interconnect/coating system. A variety of spinel-based contact layers are synthesized with different precursors and evaluated with regard to the electrical performance and microstructural evolution. The metal-containing precursor layers are fully converted after thermal exposure to 900℃ x 2 h in air due to the enhanced sinterability. It is observed that the contact layer derived from the alloy precursor is more uniform in microstructure and composition due to the shorter diffusion distance. Also, with the use of two optimal spinel-forming precursors, a dual-layer structure with a dense protective coating layer and a porous contact layer can be formed simultaneously at the stack firing temperature without the need of any reduction treatment, further simplifying the cell assembling process and thus reducing the overall fabrication cost.

title: The Performance Of Spinel-Based Interconnect Coating And Cathode-Side Contact Layer For Solid Oxide Fuel Cell

creator: Yutian Yu

subject: Materials Science [0794] - primary

description: The development of low-cost raw materials and process for achieving high-quality cathode-side interconnect coating and contact layer is critical to the commercial deployment of solid oxide fuel cell. The transitional metal-containing spinels are widely used as coating materials for protecting ferritic stainless steel interconnects. This study focuses on developing a cost-effective approach to achieve high-performance interconnect coatings and investigating spinel-based materials to replace conventional perovskite contact at the cathode-interconnect interface. A mixture of Fe+CoO or Co+Mn3O4 is applied on the interconnect via screen printing and then thermally converted into a dense and adherent spinel layer in air at the elevated temperature. The synthesized layers inhibit the Cr2O3 scale growth on the stainless steel and reduce the scale ASR. When commercial reactive element-free alloys are used as the interconnect materials, Ce element can be readily added into the spinel, further improving the behavior of the interconnect/coating system. A variety of spinel-based contact layers are synthesized with different precursors and evaluated with regard to the electrical performance and microstructural evolution. The metal-containing precursor layers are fully converted after thermal exposure to 900℃ x 2 h in air due to the enhanced sinterability. It is observed that the contact layer derived from the alloy precursor is more uniform in microstructure and composition due to the shorter diffusion distance. Also, with the use of two optimal spinel-forming precursors, a dual-layer structure with a dense protective coating layer and a porous contact layer can be formed simultaneously at the stack firing temperature without the need of any reduction treatment, further simplifying the cell assembling process and thus reducing the overall fabrication cost.

contributor: Tennessee Technological University

date: 2020-04-16

type: text

publisher: Tennessee Technological University. Archives and Special Collections

language: English

rights: In Copyright

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