On the delamination of air electrodes of solid oxide electrolysis cells: A mini-review

Abstract

Electrochemically producing hydrogen from water via solid oxide electrolysis cells (SOECs) is regarded as one of the promising options for renewable energy storage. However, the delamination of the air electrodes was often observed during long-term tests, which significantly reduces the lifespan of SOECs and hinders the commercialization of this technology. This mini-review will involve the proposed mechanisms accounting for the delamination and possible methods to prevent or alleviate it. We expect that this mini-review will provide rational guidelines for the design of air electrode–electrolyte interface of SOECs which can effectively extend the lifespan.