Ni infiltrated Sr2Fe1.5Mo0.5O6-δ-Ce0.8Sm0.2O1.9 electrode for methane assisted steam electrolysis process

• Electrical input for steam electrolysis is reduced by assisting with CH4.
• Cell performance of CH4 assisted SOEC is improved by Ni infiltration.
• A current density of − 1022 mA cm− 2 is achieved at 850 °C and 0.5 V.
• ECR method is used to study Ni catalysts effect on the catalytic properties.

It is an effective way to substitute air to methane in the anode of solid oxide electrolysis cells to reduce the electrical consumption for simultaneously producing H2 and high-quality syngas. In the methane assisted mode, the thermodynamic properties and Nernst potential exhibit one order of magnitude reduction of applied voltage to produce comparable electrolysis current. Ni catalysts are infiltrated to the SFM-SDC anode to improve the catalytic properties for methane assisted steam electrolysis. After Ni infiltration, surface oxygen exchange coefficient is effectively accelerated from 3.03 × 10− 5 to 2.20 × 10− 4 cm s− 1, and the current density is significantly enhanced from − 487 to − 1022 mA cm− 2 at 850 °C and 0.5 V.

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