Cited by 545CO2 Reduction Techniques and CatalystsCatalysts for Methane ReformingElectrocatalysts for Energy Conversion

Active Sites of Au and Ag Nanoparticle Catalysts for CO2 Electroreduction to CO

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Back, Seoin, Yeom, Min Sun, Jung, Yousung·2015·ACS Catalysis

Abstract

Highly active and selective CO2 conversion into useful chemicals is desirable to generate valuable products out of greenhouse gases. To date, various metal-based heterogeneous catalysts have shown promising electrochemical catalytic activities for CO2 reduction, yet there have been no systematic studies of the active sites of these metal catalysts that can guide further experiments. In this study, we use first-principles calculations to identify active sites for the CO2 reduction reaction for Ag and Au metals, the two metals that have been shown to be the most active in producing CO. We compare the catalytic activity and selectivity of three reaction sites of nanoparticles, namely, low-index surfaces, edge sites, and corner sites of these metals. For nanoparticle corner sites, in particular, we find that the size effect is critical, and 309-atom (or larger) nanoparticles should be used to appropriately describe realistic metal nanocatalysts. However, a 55-atom cluster model is often used in the literature to model nanoparticles. From a comparative study, we reveal that corner sites are the most active for the CO2 reduction reaction in the case of Au, whereas edge sites are the most active in the case of Ag. Although Au is generally the more active CO2 reduction catalyst than Ag due to the intrinsically stronger binding of *C-species, our results indicate that reducing the size of Au nanoparticles up to 2 nm also increases the unwanted H2 evolution reaction, as observed in a recent experiment. However, reducing the size of Ag nanoparticles up to 2 nm enhances the CO2 reduction reaction without suffering from the H2 evolution reaction, and on this basis, Ag nanoparticles are a comparable or even better-performing, inexpensive catalyst than Au for electrochemical CO production. Our findings suggest that the catalyst design principle (elemental composition, morphology, and size) is metal-dependent and should be carefully tailored for each system.

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Crossref · 10.1021/acscatal.5b00462

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  • A strong correlation between binding energies of various reaction intermediates on transition metals and a lack of ability to independently control them poses a significant intrinsic limitation in developing suitable catalysts for large-scale commercialization of the CO2 reduction reaction.

    “general understanding at present is that a strong correlation between binding energies of various reaction intermediates on transition metals and a lack of ability to independently control them poses a significant intrinsic limitation in developing suitable catalysts for large-scale commercialization of the CO2 reduction reaction.”
  • For transition metals in general, the binding behaviors of *H, *COOH, and *CO all have the same tendency due to a well-known scaling relation.

    “due to a well-known scaling relation, the binding behaviors of *H, *COOH, and *CO all have the same tendency for transition metals in general.3,7”

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Authors
Back, S., Yeom, M. S., & Jung, Y.
Affiliations
  • Korea Advanced Institute of Science and Technology (KR)
  • KISTI National Supercomputing Center (KR)
Corresponding author
Jung, Yousung
Venue
ACS Catalysis
Published
2015-07-13
Volume
5
Issue
9
Pages
5089-5096
ISSN
2155-5435 (ISSN-L)
OpenAlex
W2497854141
Cited by
545
References
45
Citations by year
2026: 28 · 2025: 33 · 2024: 57 · 2023: 53 · 2022: 61 · 2021: 70 · 2020: 52 · 2019: 77 · 2018: 54 · 2017: 35 · 2016: 25
FWCI
11.23
Type
journal article
Language
en
Open access
Locations
  • ACS Catalysis (publishedVersion, other-oa)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
Funders
  • U.S. Department of Energy (DE-FG01-05EW07033)
  • National Science Foundation (DMR-1407658, CHE-0847262, CHE-1306730)
  • Villum Fonden (10096)
  • European Cooperation in Science and Technology (CM1204)
  • Agence Nationale de la Recherche (ANR-08-BLAN-0065)
  • Ministry of Education, Culture, Sports, Science, and Technology (22350064)
  • National Natural Science Foundation of China (20937002, 21120102040, 21274013, 21275004, 21275119, 21372255, 21472251, 41276146, 51073036, 51373034, U1403301)
  • Ministry of Education of the People's Republic of China (141gjc16, NA, XDJK2014A012)
  • Dalian Institute of Chemical Physics (NA)
  • National Research Foundation of Korea (2011-35B-C00024, 2013R1A1A2061694, 2014R1A1A1002642, NRF-2014H1A2A1016055)
  • Program for New Century Excellent Talents in University (NCET-12-0932)
  • Ministry of Land and Resources of the People's Republic of China (201305017)
  • Seventh Framework Programme (608575)
  • Agency for Defense Development (UD140047GD)
  • Innovation Fund Denmark (0603-00462B)
  • Ministarstvo Prosvete, Nauke i Tehnoloskog Razvoja, Republika Srbija (171020)
  • The National Basic Research Program of China (2013CB430002, 2013CB430004)
  • AKTION (70p10, NA)
  • European Regional Development Fund (CZ.1.05/1.1.00/02.0068)
  • Ministerio de Economia y Competitividad (FIS2010-21282-C02-01, FIS2012-30996, NA)
  • Beta Cat Pharmaceuticals LLC (NA)
  • CEITEC Central European Institute of Technology (NA)
  • New Century Excellent Talent Program of MOE (NA, NCET-12-0932)
  • Technology Agency of the Czech Republic (NA, TE01020233)
  • Fundamental Research Funds for the Central Universities (XDJK2014A012)
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › CO2 Reduction Techniques and Catalysts
  • Physical Sciences › Chemical Engineering › Catalysis › Catalysts for Methane Reforming
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
Keywords
electrochemical CO2 reduction, gold nanoparticles, silver nanoparticles, active site, corner sites, edge sites, low-index surfaces, nanoparticle size effects, catalyst selectivity

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