Highly efficient CO2 electrolysis to CO on Ruddlesden–Popper perovskite oxide with in situ exsolved Fe nanoparticles. Issue 13 (19th March 2021)

• Record Type: Journal Article
• Authors: Choi, Junil; Park, Seongmin; Han, Hyunsu; Kim, Minho; Park, Minseon; Han, Jeonghyeon; Kim, Won Bae
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 13(2021)
• Page Start: 8740
• Page End: 8748
• Publication Date: 2021-03-19
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta11328j
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A highly active and stable catalyst La1.2 Sr0.8 Mn0.4 Fe0.6 O4− α (R.P.LSMF) decorated with in situ exsolved Fe nanoparticles was derived from La0.6 Sr0.4 Mn0.2 Fe0.8 O3− δ (LSMF) by simple annealing and applied to CO2 electrolysis on solid oxide electrolysis cells (SOECs). Abstract : We prepared a highly active and stable cathode catalyst for a solid oxide electrolysis cell (SOEC), decorated with in situ exsolved Fe nanoparticles (NPs) socketed on La1.2 Sr0.8 Mn0.4 Fe0.6 O4− α (R.P.LSMF), toward the CO2 electrolysis reaction to produce CO selectively. This catalyst was derived from the perovskite structure of La0.6 Sr0.4 Mn0.2 Fe0.8 O3− δ (LSMF) by simple annealing in a H2 atmosphere and showed high current densities of 2.04, 1.43, and 0.884 A cm −2 at 850, 800, and 750 °C, respectively, at a voltage of 1.5 V with corresponding total polarization resistance values of 0.205, 0.326, and 0.587 Ω cm 2, respectively, at an open circuit voltage. The highly improved performance should be ascribed to the in situ exsolved Fe NPs anchored on Ruddlesden–Popper oxide and to the increased contents of oxygen vacancies in R.P.LSMF. More importantly, this active catalyst also exhibited a stable voltage profile for 100 h operation at an constant current density of 1.8 A cm −2, suggesting that the catalyst Fe–R.P.LSMF proposed in this study is a highly promising candidate for use in an efficient SOEC cathode for CO2 electrolysis processes.