Cited by 50CO2 Reduction Techniques and CatalystsCatalytic Processes in Materials ScienceCatalysts for Methane Reforming

Predicted Structures of the Active Sites Responsible for the Improved Reduction of Carbon Dioxide by Gold Nanoparticles

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Cheng, Tao, Huang, Yufeng, Xiao, Hai, Goddard, William A.·2017·The Journal of Physical Chemistry Letters

Abstract

Gold (Au) nanoparticles (NPs) are known experimentally to reduce carbon dioxide (CO 2 ) to carbon monoxide (CO), with far superior performance to Au foils. To obtain guidance in designing improved CO 2 catalysts, we want to understand the nature of the active sites on Au NPs. Here, we employed multiscale atomistic simulations to computationally synthesize and characterize a 10 nm thick Au NP on a carbon nanotube (CNT) support, and then we located active sites from quantum mechanics (QM) calculations on 269 randomly selected sites. The standard scaling relation is that the formation energy of *COOH (Δ E *COOH ) is proportional to the binding energy of *CO ( E binding *CO ); therefore, decreasing Δ E *COOH to boost the CO 2 reduction reaction (CO 2 RR) causes an increase of E binding *CO that retards CO 2 RR. We show that the NPs have superior CO 2 RR because there are many sites at the twin boundaries that significantly break this scaling relation.

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  1. To summarize, we employed multiscale simulations to 213 computationally "synthesize" a Au NP with a thickness of 10 214 nm on a CNT support. The XRD of this Au NP (Figure S1) 215 shows the FCC crystal structure, consistent with the 216 experimental results. The simulated TEM image (Figure 1B) 217 shows clear GB structures. A dislocation analysis shows that 1/ 218 6⟨112⟩ Shockley partial dislocations are most abundant, which 219 induces stacking defects on the surface. 220 To locate the active sites for CO 2 RR, we randomly selected 221 269 response sites out of 11 360 total sites (2.4%) for QM 222 calculations. The QM results show a linear relationship 223 between ΔE *COOH and ΔE CO , showing that most sites exhibit 224 the normal scaling relationship between *COOH stabilization, 225 *CO desorption, and HER. However, we find a substantial 226 fraction (10%) of NP sites on GBs or twin boundaries that 227 significantly decrease ΔE *COOH without increasing ΔE CO , 228 leading to superior CO 2 RR performance. 229 ■ ASSOCIATED CONTENT 230 * S Supporting Information 231 The Supporting Information is available free of charge on the 232 ACS Publications website at DOI: 10.1021/acs.jpclett.7b01335. 233 Simulation details, simulated XRD patterns, equation of 234 state of FCC Au, a Au octahedral model, and ReaxFF 235 parameters of Au and C (PDF) 236 ■ AUTHOR INFORMATION 237 Corresponding Author 238 *E-mail: wag@wag.caltech.edu. 239 ORCID 240 · DOI
  2. Nanoparticles. J. Am. Chem. Soc. 2014, 136, 6978-6986. (10) 285
  3. Zheng, X.; Dinh, C. T.; Fan, F.; Cao, C.; et al. Enhanced 287 Electrocatalytic CO 2 Reduction via Field-Induced Reagent Concen- 288 tration. Nature 2016, 537, 382-386. (11) 289
  4. Calculations with Explicit Water. J. Am. Chem. Soc. 2016, 138, 13802- 310 13805. (17311
  5. Elementary Steps. Angew. Chem., Int. Ed. 2013, 52, 2459-2462. (19) 316
  6. Electroreduction to Methane on Transition-Metal Catalysts. J. Phys. 322 Chem. Lett. 2012, 3, 251-258.

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Authors
Cheng, T., Huang, Y., Xiao, H., & Goddard, W. A.
Affiliations
California Institute of Technology (US)
Corresponding author
Goddard, William A.
Venue
The Journal of Physical Chemistry Letters
Published
2017-07-07
Volume
8
Issue
14
Pages
3317-3320
ISSN
1948-7185 (ISSN-L)
OpenAlex
W2731127878
Cited by
50
References
23
Citations by year
2026: 3 · 2025: 1 · 2024: 2 · 2023: 7 · 2022: 5 · 2021: 7 · 2020: 5 · 2019: 7 · 2018: 12 · 2017: 1
FWCI
1.83
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physical Chemistry Letters (publishedVersion)
  • PubMed (publishedVersion)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
Funders
Office of Science (DE-SC0004993)
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › CO2 Reduction Techniques and Catalysts
  • Physical Sciences › Materials Science › Materials Chemistry › Catalytic Processes in Materials Science
  • Physical Sciences › Chemical Engineering › Catalysis › Catalysts for Methane Reforming
Keywords
gold nanoparticles, carbon dioxide reduction, active site, CO adsorption, twin boundaries, carbon nanotube support, scaling laws, electrocatalysis

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