A promising strontium and cobalt-free air electrode Pr1-xCaxFeO3-d for solid oxide electrolysis cell

A promising strontium and cobalt-free ferrite Pr1-xCaxFeO3-delta (PCF, x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) has been synthesized successfully by glycine-nitrate combustion method and used as the air electrode of solid oxide electrolysis cell (SOEC) for steam electrolysis. The crystal structure and electricity conductivity of PCF are investigated in detail. According to the conductivity test, Pr0.6Ca0.4FeO3-delta (PCF64) with higher conductivity is selected as the air electrode to pre-paring the single cell with structure of PCF64|GDC|SSZ|YSZ-NiO. Under SOFC mode, the maximum power density of the single cell is 462.93 mW cm(-2) at 800 degrees C with hydrogen as fuel. Under SOEC mode, the current density reaches 277.14 mA cm(-2) and the corresponding hydrogen production rates is 115.84 mL cm(-2) h(-1) at 800 degrees C at 1.3 V. In the 10 h short-term stability test, the cell shows good electrolysis stability. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

A promising strontium and cobalt-free ferrite, PCF, was synthesized successfully and used as the air electrode of solid oxide electrolysis cell for steam electrolysis. The selected PCF64 showed high conductivity and stability in both SOFC and SOEC modes, demonstrating good electrolysis efficiency.