CO2 electroreduction on copper-cobalt nanoparticles: Size and composition effect
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Standard
CO2 electroreduction on copper-cobalt nanoparticles : Size and composition effect. / Bernal, M.; Bagger, A.; Scholten, F.; Sinev, I.; Bergmann, A.; Ahmadi, M.; Rossmeisl, J.; Cuenya, B. Roldan.
I: Nano Energy, Bind 53, 2018, s. 27-36.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - CO2 electroreduction on copper-cobalt nanoparticles
T2 - Size and composition effect
AU - Bernal, M.
AU - Bagger, A.
AU - Scholten, F.
AU - Sinev, I.
AU - Bergmann, A.
AU - Ahmadi, M.
AU - Rossmeisl, J.
AU - Cuenya, B. Roldan
PY - 2018
Y1 - 2018
N2 - Understanding the changes that a catalyst may experience on its surface during a reaction is crucial in order to establish structure/composition-reactivity correlations. Here, we report on bimetallic size-selected Cu100-xCox nanoparticle (NP) catalysts for CO2 electroreduction reaction (CO2RR) and we identify the optimum Cu/Co ratio and NP size leading to improved activity and selectivity. Operando X-ray absorption spectroscopy (XAS) and quasi in situ X-ray photoelectron spectroscopy (XPS) provided insight into the morphological, structural, and chemical transformations underwent by the CuCo NPs during CO2RR. We illustrate that the as-prepared state of the bimetallic NPs is drastically different from the structure and surface composition of the working catalyst. Under electrochemical conditions, a reduction of both initially oxidized metallic species was observed, accompanied by Cu surface segregation. Density functional theory (DFT) results from a Cu3X model were used to describe the surface segregation. In order to extract mechanistic understanding, the activity of the experimental Cu and CuCo NPs towards CO2RR was described via DFT in terms of the interaction of Cu facets under expansion and compression with key reaction intermediates, in particular CO* and COOH*.
AB - Understanding the changes that a catalyst may experience on its surface during a reaction is crucial in order to establish structure/composition-reactivity correlations. Here, we report on bimetallic size-selected Cu100-xCox nanoparticle (NP) catalysts for CO2 electroreduction reaction (CO2RR) and we identify the optimum Cu/Co ratio and NP size leading to improved activity and selectivity. Operando X-ray absorption spectroscopy (XAS) and quasi in situ X-ray photoelectron spectroscopy (XPS) provided insight into the morphological, structural, and chemical transformations underwent by the CuCo NPs during CO2RR. We illustrate that the as-prepared state of the bimetallic NPs is drastically different from the structure and surface composition of the working catalyst. Under electrochemical conditions, a reduction of both initially oxidized metallic species was observed, accompanied by Cu surface segregation. Density functional theory (DFT) results from a Cu3X model were used to describe the surface segregation. In order to extract mechanistic understanding, the activity of the experimental Cu and CuCo NPs towards CO2RR was described via DFT in terms of the interaction of Cu facets under expansion and compression with key reaction intermediates, in particular CO* and COOH*.
KW - CO2 electroreduction
KW - Copper
KW - Electrochemistry
KW - Nanoparticle
KW - Operando spectroscopy
KW - Surface segregation
U2 - 10.1016/j.nanoen.2018.08.027
DO - 10.1016/j.nanoen.2018.08.027
M3 - Journal article
AN - SCOPUS:85052003245
VL - 53
SP - 27
EP - 36
JO - Nano Energy
JF - Nano Energy
SN - 2211-2855
ER -
ID: 220856381