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Development of Bi‐layer Metal Substrate Architectures for Suspension Plasma Sprayed Solid Oxide Fuel Cells
Author(s) -
ArevaloQuintero O.,
Kesler O.
Publication year - 2018
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201700187
Subject(s) - materials science , electrolyte , layer (electronics) , oxide , cermet , chemical engineering , solid oxide fuel cell , electrode , open circuit voltage , substrate (aquarium) , metal , electrochemistry , porosity , composite material , metallurgy , chemistry , voltage , ceramic , physics , oceanography , quantum mechanics , engineering , geology
Metal‐supported solid oxide fuel cells have several advantages, which could potentially increase the overall competitiveness of the technology, compared to their cermet‐supported counterparts. However, surface imperfections and rapid oxidation of the metal supports at operating temperatures are factors that affect the electrochemical performance and durability of the cells. In this study, we have developed bi‐layer metal supports consisting of a thin, finely structured top layer and a thicker, more coarsely structured bottom layer. The fine top layer has small surface pore sizes which facilitate the deposition of defect‐free electrolyte layers, while the coarse layer provides greater open porosity and larger pore sizes to facilitate mass transport and to decrease the rate of oxidation. An open circuit voltage (OCV) as high as 1.105 V at 750 °C in 3% humidified hydrogen is reported in this study, which deviates from the Nernst potential by only 5 mV. This result shows that the bi‐layer support has the potential to minimize electrode and electrolyte defects, which are known to be detrimental to cell performance. In addition, the bi‐layer supports show better oxidation resistance compared to benchmark finely‐structured single‐layer supports fabricated in this study for comparison.