High Temperature Co-electrolysis of CO_2 and Water on Doped Lanthanum Chromites

摘要

The high temperature Solid Oxide Electrolysis or Co-electrolysis (SOEC) technology has a huge potential for future mass production of hydrogen (and synthesis gas) and shows great dynamics to become commercially competitive against other electrolysis technologies, which are better established but more expensive and less efficient. Despite the fact that Ni-YSZ, a state-of-the-art (SoA) SOEC electrode, has been proven to be an efficient electrode for electrolysis applications in terms of current density, it suffers from various degradation issues. In this respect, the perovskitic material La_(0.75)Sr_(0.25)Cr_(0.9)Fe_(0.1)O_(3-δ) which is a mixed ionic-electronic conductor is prepared and studied as cathode electrode in electrolysis. This electrode, in combination with a typical LSM anode electrode in electrolyte (YSZ) supported cells, shows high efficiency comparable to that of the-state-of-the-art Ni-YSZ, while it exhibits highly stable performance during both H_2O electrolysis and H_2O-CO_2 co-electrolysis.