Cited by 265CO2 Reduction Techniques and CatalystsElectrocatalysts for Energy ConversionAdvanced Photocatalysis Techniques

Insight into Electrochemical CO 2 Reduction on Surface-Molecule-Mediated Ag Nanoparticles

Kim, Cheonghee, Eom, Taedaehyeong, Jee, Michael Shincheon, Jung, Hyejin, Kim, Hyungjun, Min, Byoung Koun, Hwang, Yun Jeong·2017·ACS Catalysis

Abstract

The electrochemical CO 2 reduction reaction to form valued hydrocarbon molecules is an attractive process, because it can be coupled with renewable energy resources for carbon recycling. For an efficient CO 2 conversion, designing a catalyst with high activity and selectivity is crucial, because the CO 2 reduction reaction in aqueous media competes with the hydrogen evolution reaction (HER) intensely. We have developed a strategy to tune CO 2 reduction activity by modulating the binding energies of the intermediates on the electrocatalyst surfaces with the assistance of molecules that contain the functional group. We discovered that the amine functional group on Ag nanoparticle is highly effective in improving selective CO production (Faradaic efficiency to 94.2%) by selectively suppressing HER, while the thiol group rather increases HER activity. A density functional theory (DFT) calculation supports the theory that attaching amine molecules to Ag nanoparticles destabilizes the hydrogen binding, which effectively suppresses HER selectively, while an opposite tendency is found with thiol molecules. In addition, changes in the product selectivity, depending on the functional group, are also observed when the organic molecules are added after nanoparticle synthesis or nanoparticles are immobilized with an amine (or thiol)-containing anchoring agent. CO Faradaic efficiencies were consistently improved when the Ag nanoparticle was modified with amine groups, compared with that of its thiol counterpart.

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Crossref · 10.1021/acscatal.6b01862

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Authors
Kim, C., Eom, T., Jee, M. S., Jung, H., Kim, H., Min, B. K., & Hwang, Y. J.
Affiliations
  • Korea Institute of Science and Technology (KR)
  • Korea Advanced Institute of Science and Technology (KR)
  • Korea University (KR)
Corresponding author
  • Kim, Hyungjun
  • Min, Byoung Koun
  • Hwang, Yun Jeong
Venue
ACS Catalysis
Published
2016-12-21
Volume
7
Issue
1
Pages
779-785
ISSN
2155-5435 (ISSN-L)
OpenAlex
W2560046959
Cited by
265
References
34
Citations by year
2026: 17 · 2025: 21 · 2024: 24 · 2023: 30 · 2022: 31 · 2021: 47 · 2020: 32 · 2019: 35 · 2018: 18 · 2017: 10
FWCI
5.70
Type
journal article
Language
en
Open access
closed
Locations
  • ACS Catalysis (publishedVersion)
  • Seoul National University Open Repository (Seoul National University) (submittedVersion)
Funders
  • National Research Foundation of Korea
  • Korea Institute of Science and Technology
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › CO2 Reduction Techniques and Catalysts
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Advanced Photocatalysis Techniques
Keywords
electrochemical CO2 reduction, silver nanoparticles, amine functionalization, thiol functionalization, hydrogen evolution suppression, CO selectivity, Faradaic efficiency, intermediate binding energy, surface modification, carbon recycling

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