Revisiting strontium-doped lanthanum cuprate perovskite for the electrochemical reduction of CO2

Electrochemically Induced Phase Changes in La2CuO4 During Cathodic Electrocatalysis

“…The dependence of both observed reaction products and electrochemical performance characteristics on electrochemical conditioning identifies the structural stability as an important consideration in the development of RPOs as cathodic electrocatalysts. Compositional tuning may prove to be an effective strategy to stabilize RPOs for cathodic reactions, but inconsistency in reported ECR product distributions on La 2‐x Sr x CuO 4 suggests that structural changes and amorphization may extend to other members of the structural family . Thorough structural and electrochemical analyses should therefore be employed when studying this family of materials.…”

“…While oxygen deficient LCO has been synthesized, details regarding the cathodic electrochemistry of LCO and potential phase changes have not received similar scrutiny. Nonetheless, LCO and related doped phases have been directly employed as catalysts for electrocatalytic reduction reactions including photocatalytic HER, ORR and ECR . The possibility of phase changes are of practical interest as materials like Sr x La 2‐x CuO 4 have been shown to be selective catalysts for ECR, but the selectivity has been variably reported to yield either solely hydrocarbons or alcohols .…”

“…Nonetheless, LCO and related doped phases have been directly employed as catalysts for electrocatalytic reduction reactions including photocatalytic HER, ORR and ECR . The possibility of phase changes are of practical interest as materials like Sr x La 2‐x CuO 4 have been shown to be selective catalysts for ECR, but the selectivity has been variably reported to yield either solely hydrocarbons or alcohols . As little information is available to rationalize such results, it is of particular interest in catalyst design to establish an understanding of the cathodic stability of such materials.…”

Chapter 5. Present and future prospects in heterogeneous catalysts for C1 chemistry

“…However, it does appear that the copper oxide electrodes are gradually reduced back to metallic copper and lose their activity and selectivity for methanol production, as compared to methane production. 16,17 As another example of catalyst structure and composition dictating the favored products of CO 2 reduction, Kaneco et al studied the photoelectrochemical reduction of CO 2 on transition metal particles deposited on a p-type semiconductor, InP. While Pd/InP reduces CO 2 to only CO, Ni/InP yields CO, formic acid, methane and ethylene.…”

“…121 Reported Faradaic yields for both ethanol (30.7%) and n-propanol (10.0%) are quite high at ambient temperatures and pressures, suggesting that selectivity towards alcohol products is markedly enhanced compared to metal (oxide) (e.g., copper (oxide)) electrodes, for example there is also the possibility of directly producing ethylene by decreasing the temperature from 25 1C to 2 1C. 17 Alternatively, by varying the potentials applied at the working electrodes, different products may be produced. For potentials at least as negative as 2.2 V vs. standard calomel electrode (SCE), alcohols are preferentially produced, whereas higher potentials may result in methane production.…”