Publication date: 10th April 2024
Proton-conducting oxide cells have promising applications in hydrogen production through steam electrolysis and fuel cells, operating at lower temperatures than those utilizing conventional oxide ion conductors like YSZ. However, proton-conducting oxides exhibit hole conduction in oxidizing atmospheres, leading to electronic leakage in cells, resulting in lower Faradaic efficiency in steam electrolysis and excessive fuel consumption in fuel cells.
While using proton conductors devoid of hole conduction could offer a fundamental solution to these challenges, it proves difficult due to the underlying principles of proton conductivity.
This study investigates methods to mitigate electronic leakage, particularly by controlling mass transport of species that participate in electrode reactions. For instance, enhancing the Faraday efficiency of steam electrolysis was achieved by incorporating Gd-doped ceria as an electron-blocking layer in the air/steam electrode, as depicted in the figure.
Interestingly, experimental findings confirm that such electrode structures with inserted electron-blocking layers do not effectively suppress electronic leakage in fuel cells. While steam electrolysis and fuel cells are often portrayed as operating in reverse, this does not imply precisely opposite processes occur in electrode reactions or electronic leakage reactions.
This presentation will delve into how electronic leakage can be controlled precisely by determining where and how to intervene in steam electrolysis and fuel cells.
This work contains results obtained from a project, (JPNP20003), commissioned by the New Energy and Industrial Technology Development Organization (NEDO), and was supported by the Center for Energy Systems Design (CESD) and International Institute for Carbon Neutral Energy Research (WPI-I2CNER), which was established by the World Premier International Research Center Initiative (WPI), MEXT, Japan.
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