Operando NRIXS and XAFS Investigation of Segregation Phenomena in Fe-Cu and Fe-Ag Nanoparticle Catalysts during CO₂ Electroreduction.

ABSTRACT: 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 CO₂ reduction (CO₂ RR) and to extract correlations with their catalytic activity and selectivity. The formation of a core-shell structure during CO₂ 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 KHCO₃ at -1.1 V vs. RHE, similar to that of pure Ag NPs. In contrast, a predominant selectivity towards H₂

SUBMITTER: Kunze S 

PROVIDER: S-EPMC7756314 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature