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

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [2];  [3];  [4];  [3];  [2];  [4]
  1. Carnegie Mellon University, Pittsburgh, PA (United States); National Energy Technology Laboratory (NETL), Pittsburgh, PA (United States); OSTI
  2. University of Pittsburgh, PA (United States)
  3. National Energy Technology Laboratory (NETL), Pittsburgh, PA (United States)
  4. Carnegie Mellon University, Pittsburgh, PA (United States)
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. Here 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.
Research Organization:
Carnegie Mellon University, Pittsburgh, PA (United States); Pennsylvania State University, University Park, PA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Fossil Energy (FE); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231; FE0026825
OSTI ID:
1849193
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 12 Vol. 60; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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