Preparation and CO2 Electrolysis Performance of A-Site Deficient La6Sr0.3Cr0.5Fe0.5O3-δ Materials
To further enhance the catalytic activity of the perovskite-type oxide La0.7Sr0.3Cr0.5Fe0.5O3-δ(LSCrF),non-stoichiometric defects were introduced at the A-site of the LSCrF material to prepare A-site deficient La0.6Sr0.3Cr0.5Fe0.5O3-δ(A-LSCrF).The physical-chemical properties and electrochemical performance of the materials were investigated using a comprehensive set of characterization techniques,including X-ray diffraction(XRD),scanning electron microscopy(SEM),Brunauer-Emmett-Teller(BET)analysis,thermogravimetric analysis(TGA),and electrochemical testing.The results indicate that the A-LSCrF sample exhibits uniform particle sizes,with a specific surface area and mean pore diameter of 1.70 m2·g-1 and 14.08 nm,respectively.Under operating conditions,it generates a higher concentration of oxygen vacancies,which is beneficial in boosting catalytic activity.At 2.00 V,the current density of the LSCrF-based single cell is 0.73 A·cm-1,whereas the A-LSCrF-based single cell achieves a current density of 1.38 A·cm-1.These findings suggest that the introduction of A-site defects effectively increases the concentration of oxygen vacancies,thereby enhancing the cell's performance in electrochemical CO2 reduction.
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