Ni–Fe–La(Sr)Fe(Mn)O<sub>3</sub> as a New Active Cermet Cathode for Intermediate‐Temperature CO<sub>2</sub> Electrolysis Using a LaGaO<sub>3</sub>‐Based Electrolyte

DOI Web Site Web Site 4 Citations 42 References
  • Shijing Wang
    Department of Automotive Science Graduate School of Integrated Frontier Science Kyushu University Fukuoka 819–0395 Japan
  • Hidekazu Tsuruta
    Steel Research Laboratory JFE Steel Corporation 1‐1, Minamiwatarida‐cho Kawasaki‐ku, Kawasaki 210‐0855 Japan
  • Minoru Asanuma
    Steel Research Laboratory JFE Steel Corporation 1‐1, Minamiwatarida‐cho Kawasaki‐ku, Kawasaki 210‐0855 Japan
  • Tatsumi Ishihara
    Department of Automotive Science Graduate School of Integrated Frontier Science Kyushu University Fukuoka 819–0395 Japan

Description

<jats:p>Various additives to Ni–Fe systems are studied as cermet cathodes for CO<jats:sub>2</jats:sub> electrolysis (973–1173 K) using a La<jats:sub>0.9</jats:sub>Sr<jats:sub>0.1</jats:sub>Ga<jats:sub>0.8</jats:sub>Mg<jats:sub>0.2</jats:sub>O<jats:sub>3</jats:sub> (LSGM) electrolyte, which is one of the most promising oxide‐ion conductors for intermediate‐temperature solid‐oxide electrolysis cells in terms of ionic‐transport number and conductivity. It is found that Ni–Fe–La<jats:sub>0.6</jats:sub>Sr<jats:sub>0.4</jats:sub>Fe<jats:sub>0.8</jats:sub>Mn<jats:sub>0.2</jats:sub>O<jats:sub>3</jats:sub> (Ni–Fe–LSFM) exhibits a remarkable performance with a current density of 2.32 A cm<jats:sup>−2</jats:sup> at 1.6 V and 1073 K. The cathodic overpotential is significantly decreased by mixing the LSFM powder with Ni–Fe, which is related to the increase in the number of reaction sites for CO<jats:sub>2</jats:sub> reduction. For Ni–Fe–LSFM, much smaller particles (<200 nm) are sustained under CO<jats:sub>2</jats:sub> electrolysis conditions at high temperatures than for Ni–Fe. X‐ray diffraction analysis suggests that the main phases of Ni–Fe–LSFM are Ni and LaFeO<jats:sub>3</jats:sub>; thus, the oxide phase of LaFeO<jats:sub>3</jats:sub> is also maintained during CO<jats:sub>2</jats:sub> electrolysis. Analysis of the gaseous products indicates that only CO is formed, and the rate of CO formation agrees well with that of a four‐electron reduction process, suggesting that the reduction of CO<jats:sub>2</jats:sub> to CO proceeds selectively. It is also confirmed that almost no coke is deposited on the Ni–Fe–LSFM cathode after CO<jats:sub>2</jats:sub> electrolysis.</jats:p>

Journal

Citations (4)*help

See more

References(42)*help

See more

Related Projects

See more

Report a problem

Back to top