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Single transition metal atoms embedded at single vacancies of graphene provide a unique paradigm for catalytic reactions. We present a density functional theory study of such systems for the electrochemical reduction of CO. Theoretical investigations of CO electrochemical reduction are particularly challenging in that electrochemical activation energies are a necessary descriptor of activity. We determined the electrochemical barriers for key proton–electron transfer steps using a state-of-the-art, fully explicit solvent model of the electrochemical interface. The accuracy of GGA-level functionals in describing these systems was also benchmarked against hybrid methods. We find the first proton transfer to form CHO from CO to be a critical step in C_1 product formation. On these single atom sites, the corresponding barrier scales more favorably with the CO binding energy than for 211 and 111 transition metal surfaces, in the direction of improved activity. Intermediates and transition states for the hydrogen evolution reaction were found to be less stable than those on transition metals, suggesting a higher selectivity for CO reduction. We present a rate volcano for the production of methane from CO. We identify promising candidates with high activity, stability, and selectivity for the reduction of CO. This work highlights the potential of these systems as improved electrocatalysts over pure transition metals for CO reduction.

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Caltech Authors  


Kirk, Charlotte -  Chen, Leanne D. -  Siahrostami, Samira -  Karamad, Mohammadreza -  Bajdich, Michal -  Voss, Johannes -  Nørskov, Jens K. -  Chan, Karen - 

Id.: 70775187

Versión: 1.0

Estado: Final

Tipo:  application/pdf -  application/pdf - 

Tipo de recurso: Article  -  PeerReviewed  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

Formatos:  application/pdf -  application/pdf - 

Requerimientos técnicos:  Browser: Any - 

Relación: [References] http://resolver.caltech.edu/CaltechAUTHORS:20171219-112016737
[References] https://authors.library.caltech.edu/83966/

Fecha de contribución: 04-ene-2018


* Kirk, Charlotte and Chen, Leanne D. and Siahrostami, Samira and Karamad, Mohammadreza and Bajdich, Michal and Voss, Johannes and Nørskov, Jens K. and Chan, Karen (2017) Theoretical Investigations of the Electrochemical Reduction of CO on Single Metal Atoms Embedded in Graphene. ACS Central Science, 3 (12). pp. 1286-1293. ISSN 2374-7943. PMCID PMC5746853. http://resolver.caltech.edu/CaltechAUTHORS:20171219-112016737

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