In-situ exsolution of cobalt nanoparticles from La0.5Sr0.5Fe0.8Co0.2O3-δ cathode for enhanced CO2 electrolysis performance

Fluorine-Stabilized BO6 Octahedron of Host Perovskites for Robust Carbon Dioxide Electrolysis on Exsolved Catalysts

“…As shown in Figure d, the characteristic peaks of SrCO 3 (located at 701 cm –1 ), SrMoO 4 (located at 795, 842, and 887 cm –1 ), and carbon (D band, located at 1345 cm –1 , G band, located at 1590 cm –1 ) can be detected on the cathode of SFN 3 M-red-GDC, while only the specific peak of perovskite was found on that of F-SFN 3 M-red-GDC. The emergence of Sr- and Mo-related species points to the occurrence of significant phase decomposition on the perovskite matrix of SFN 3 M-red under the synergistic effects of high temperature and high voltage. , For F-SFN 3 M-red, on the other hand, the F anion doping unambiguously relieves the structural decomposition of the host perovskite upon the high-voltage electrolysis by reinforcing the BO 6 octahedral structure. All the stability test results strongly suggest that F-SFN 3 M-red-GDC demonstrates an outstanding performance in improving CO productivity and also highlights the great potential of F doping in achieving highly efficient CO 2 conversion of perovskite materials over a wide range of voltages.…”

“…In addition, we also need to acknowledge that the resistance of pristine perovskites to the phase transition during exsolution can be considered as an indicator of their structural stability. Perovskites that exhibit greater susceptibility to the phase transition during prereduction treatment may suggest that the initial structure is unstable, which is a great challenge for long-term stability in harsh reducing operating conditions. − Especially at relatively high voltages, the poor robustness of perovskite for CO 2 electrolysis can lead to a decrease in CO productivity, which is unfavorable for industrial-scale applications …”

Phase Transition Engineering of Host Perovskite toward Optimal Exsolution‐facilitated Catalysts for Carbon Dioxide Electrolysis

“…Given the ongoing depletion of lattice oxygen and subsequent removal of reducible cations from the perovskite substrate during the electrolysis, [12, 43] DFT was adopted to examine the structural stability of different perovskite substrates by calculating the formation energy of $${{V}_{O}^{\bullet \bullet }}$$ ($${E{V}_{O}^{\bullet \bullet }}$$ ) and co‐segregation energy of reducible cations ($${E{M}_{co-seg}}$$ , where M is donated as B‐site cations such as Ni, Fe) (Figures 4d–e, S22, S23 and Tables S6, S7) [20] . Based on different structures of substrate and different degrees of reducible Ni exsolution (Figure S24), we constructed the DP models with/without Ni doping (Ni‐DP‐SFM/DP‐SFM) and LP models with/without Ni doping (Ni‐LP‐SFM/LP‐SFM).…”

A-Site Deficiency Ba0.9La0.1Co0.7Fe0.2Nb0.1O3-δ Perovskite as Highly Active and Durable Oxygen Electrode for High-Temperature H2O Electrolysis

“…9 Second, due to its prolonged exposure to a high steam atmosphere, the oxygen electrode material needs to exhibit exceptional stability even under high water vapor concentrations. 10 Additionally, it is important for both the oxygen electrode material and the electrolyte material to have similar thermal expansion coefficients in order to prevent any reactions, delamination, or detachment during long-term operation. 11−14 Mixed ionic and electronic conductors (MIECs), such as perovskite oxide, are extensively researched.…”

“…First, it is important for the oxygen electrode material to possess superior oxygen evolution reaction (OER) activity . Second, due to its prolonged exposure to a high steam atmosphere, the oxygen electrode material needs to exhibit exceptional stability even under high water vapor concentrations . Additionally, it is important for both the oxygen electrode material and the electrolyte material to have similar thermal expansion coefficients in order to prevent any reactions, delamination, or detachment during long-term operation. − …”