Reversible solid oxide cells (RSOCs) can operate in either a fuel cell mode (to convert chemical fuels to electricity) or an electrolysis mode (to produce hydrogen from excess renewable electricity) as needed. Recently, reversible protonic ceramic electrochemical cells (R-PCECs) have attracted considerable attention due to their potential for efficient and low-cost co-located power generation and energy storage. However, the performance and durability of R-PCECs are limited mainly by the lack of highly active and robust materials for dual-mode operation. In this presentation, we will highlight the critical scientific challenges facing the development of efficient and stable materials for RSOCs based on proton-conducting electrolyte as well as the strategies for enhancing the durability and activity of air electrodes for oxygen reduction/evolution reactions. We will report our recent progress in the development of novel electrolyte, air electrode, and bi-functional catalyst materials as well as the mechanism of electrode reactions and degradation of air electrodes, as revealed by a combination of modeling, simulation, and<i> in situ</i> characterization.

Materials design for high-performance and durable reversible protonic ceramic electrochemical cells

ACS Fall 2021

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