In:
Angewandte Chemie, Wiley, Vol. 132, No. 37 ( 2020-09-07), p. 16102-16107
Abstract:
In situ exsolution of metal nanoparticles in perovskite under reducing atmosphere is employed to generate a highly active metal–oxide interface for CO 2 electrolysis in a solid oxide electrolysis cell. Atomic‐scale insight is provided into the exsolution of CoFe alloy nanoparticles in La 0.4 Sr 0.6 Co 0.2 Fe 0.7 Mo 0.1 O 3− δ (LSCFM) by in situ scanning transmission electron microscopy (STEM) with energy‐dispersive X‐ray spectroscopy and DFT calculations. The doped Mo atoms occupy B sites of LSCFM, which increases the segregation energy of Co and Fe ions at B sites and improves the structural stability of LSCFM under a reducing atmosphere. In situ STEM measurements visualized sequential exsolution of Co and Fe ions, formation of CoFe alloy nanoparticles, and reversible exsolution and dissolution of CoFe alloy nanoparticles in LSCFM. The metal–oxide interface improves CO 2 adsorption and activation, showing a higher CO 2 electrolysis performance than the LSCFM counterparts.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v132.37
DOI:
10.1002/ange.202006536
Language:
English
Publisher:
Wiley
Publication Date:
2020
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