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Operando NRIXS and XAFS Investigation of Segregation Phenomena in Fe‐Cu and Fe‐Ag Nanoparticle Catalysts during CO 2 Electroreduction
Author(s) -
Kunze Sebastian,
Grosse Philipp,
Bernal Lopez Miguel,
Sinev Ilya,
Zegkinoglou Ioannis,
Mistry Hemma,
Timoshenko Janis,
Hu Michael Y.,
Zhao Jiyong,
Alp Ercan E.,
Chee See Wee,
Roldan Cuenya Beatriz
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202010535
Subject(s) - x ray absorption fine structure , selectivity , catalysis , nanoparticle , materials science , electrochemistry , analytical chemistry (journal) , absorption (acoustics) , tetraphenylporphyrin , spectroscopy , inorganic chemistry , chemistry , electrode , nanotechnology , photochemistry , biochemistry , physics , porphyrin , quantum mechanics , chromatography , composite material
Operando nuclear resonant inelastic X‐ray scattering (NRIXS) and X‐ray absorption fine‐structure spectroscopy (XAFS) measurements were used to gain insight into the structure and surface composition of FeCu and FeAg nanoparticles (NPs) during the electrochemical CO 2 reduction (CO 2 RR) and to extract correlations with their catalytic activity and selectivity. The formation of a core–shell structure during CO 2 RR for FeAg NPs was inferred from the analysis of the operando NRIXS data (phonon density of states, PDOS) and XAFS measurements. Electrochemical analysis of the FeAg NPs revealed a faradaic selectivity of 36 % for CO in 0.1 M KHCO 3 at −1.1 V vs. RHE, similar to that of pure Ag NPs. In contrast, a predominant selectivity towards H 2 evolution is obtained in the case of the FeCu NPs, analogous to the results obtained for pure Fe NPs, although small Cu NPs have also been shown to favor H 2 production.