Volume 133, Issue 12 pp. 6421-6426
Zuschrift

Boosting CO2 Electrochemical Reduction with Atomically Precise Surface Modification on Gold Nanoclusters

Site Li

Site Li

Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA, 15213 USA

National Energy Technology Laboratory (NETL), United States Department of Energy, Pittsburgh, PA, USA

These authors contributed equally to this work.

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Anantha Venkataraman Nagarajan

Anantha Venkataraman Nagarajan

Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, PA, 15261 USA

These authors contributed equally to this work.

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Dr. Dominic R. Alfonso

Dr. Dominic R. Alfonso

National Energy Technology Laboratory (NETL), United States Department of Energy, Pittsburgh, PA, USA

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Mingkang Sun

Mingkang Sun

Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA, 15213 USA

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Dr. Douglas R. Kauffman

Corresponding Author

Dr. Douglas R. Kauffman

National Energy Technology Laboratory (NETL), United States Department of Energy, Pittsburgh, PA, USA

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Prof. Giannis Mpourmpakis

Corresponding Author

Prof. Giannis Mpourmpakis

Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, PA, 15261 USA

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Prof. Rongchao Jin

Corresponding Author

Prof. Rongchao Jin

Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA, 15213 USA

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First published: 21 December 2020
Citations: 20

Abstract

Thiolate-protected gold nanoclusters (NCs) are promising catalytic materials for the electrochemical CO2 reduction reaction (CO2RR). In this work an atomic level modification of a Au23 NC is made by substituting two surface Au atoms with two Cd atoms, and it enhances the CO2RR selectivity to 90–95 % at the applied potential between −0.5 to −0.9 V, which is doubled compared to that of the undoped Au23. Additionally, the Cd-doped Au19Cd2 exhibits the highest CO2RR activity (2200 mA mg−1 at −1.0 V vs. RHE) among the reported NCs. This synergetic effect between Au and Cd is remarkable. Density-functional theory calculations reveal that the exposure of a sulfur active site upon partial ligand removal provides an energetically feasible CO2RR pathway. The thermodynamic energy barrier for CO formation is 0.74 eV lower on Au19Cd2 than on Au23. These results reveal that Cd doping can boost the CO2RR performance of Au NCs by modifying the surface geometry and electronic structure, which further changes the intermediate binding energy. This work offers insights into the surface doping mechanism of the CO2RR and bimetallic synergism.

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