Source link : https://tech365.info/cobalt-exsolution-approach-boosts-stable-oxide-gas-cell-efficiency/
Cobalt exsolution happens in layered perovskite oxides in oxidizing atmospheres, above 700°C, and is ruled by the formation of oxygen vacancies within the supplies. Credit score: Hanbat Nationwide College
Gas cells are an environment friendly, clear various to conventional fossil-fuel-based power methods. Strong oxide gas cells (SOFCs) are particularly engaging because of their capability to make use of a number of fuels, excessive effectivity and reversibility. Cobalt (Co)-doped rare-earth layered perovskite oxides are engaging cathode supplies for low- and medium-temperature SOFCs. They provide glorious electrochemical efficiency, owing to their excessive oxygen content material and versatile management of oxygen transport.
But, electrodes made out of these supplies display low long-term stability. Key methods to deal with this challenge embrace the substitution of some Co with iron (Fe) and rising Co nanoparticles on the electrode floor by a course of known as metallic exsolution. Nevertheless, exsolution has solely been demonstrated underneath excessive temperature-reducing atmospheres. Below the precise oxidizing working surroundings of SOFC cathodes, this course of is reversed.
A analysis workforce led by Professor Junghyun Kim from the Division of Superior Supplies Engineering at Hanbat Nationwide College, Republic of Korea, has now challenged this view. “We have presented the first experimental evidence of Co-exsolution occurring in…
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Author : tech365
Publish date : 2025-10-04 04:24:00
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