Development of Low-Cost, Highly-Sinterable, Co-Free (Ni,Fe)3O4 Spinel-Based Contact Materials for SOFC Cathode-Side Contact Application Email Page
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Performer: Tennessee Technological University
Proposed environmentally-assisted reactive<br/>sintering process for synthesizing the (Ni,Fe)<sub>3</sub>O<sub>4</sub><br/>spinel (denoted as “S”) as the cathode-side contact<br/>using metallic powders as the precursor.
Proposed environmentally-assisted reactive
sintering process for synthesizing the (Ni,Fe)3O4
spinel (denoted as “S”) as the cathode-side contact
using metallic powders as the precursor.
Website: Tennessee Technological University
Award Number: FE0026210
Project Duration: 10/01/2015 – 07/31/2017
Total Award Value: $260,533
DOE Share: $200,000
Performer Share: $60,533
Technology Area: Solid Oxide Fuel Cells
Key Technology: Cell Technology
Location: Cookeville, Tennessee

Project Description

The Tennessee Technological University (TTU) will develop and demonstrate a cobalt-free nickel iron oxide [Co-free (Ni,Fe)3O4] spinel for solid oxide fuel cell (SOFC) cathode-side contact application using an environmentally-assisted reactive sintering (EARS) process at a lower sintering temperature. The starting powders and EARS parameters for the (Ni,Fe)3O4 spinel layer formation will be studied and optimized. The EARS mechanism for the spinel formation in air will be elucidated using metallic starting powders. Researchers will assess the area-specific resistance (ASR) of the developed contact layers under isothermal and cyclic exposure conditions as well as their chemical compatibility and chromium-retaining capability. Approaches to further improve the performance of the (Ni,Fe)3O4 spinel contact—such as doping the spinel with other transition metals, adding a suitable perovskite to form a composite contact material, etc.—will also be explored. A cost analysis will detail the cost reduction in both materials (e.g., utilizing a Co-free spinel phase) and processing (e.g., lowering the sintering temperature via exothermic reactions).

Project Benefits

TTU’s deposition of the metallic precursor layers via low-cost processes as well as in-situ sintering of the spinel-containing layer at the SOFC stack startup temperature enables development of the Co-free spinel contact structure at a significant reduction in overall cost. This spinel contact structure is expected to provide improved performance compared to the current contact materials because of its good electrical conductivity, adequate coefficient of thermal expansion, excellent chromium-retaining capability, and chemical compatibility to the different components. A new spinel-based structure between the cathode and interconnect will also help improve the robustness/reliability/endurance of SOFC stacks, thus contributing to the commercial viability of the SOFC technology.

Contact Information

Federal Project Manager Patcharin Burke: patcharin.burke@netl.doe.gov
Technology Manager Shailesh Vora: shailesh.vora@netl.doe.gov
Principal Investigator Jiahong Zhu: jzhu@tntech.edu

 

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