Cited by 2,000CO2 Reduction Techniques and CatalystsElectrocatalysts for Energy ConversionCatalysts for Methane Reforming

CO 2 Reduction at Low Overpotential on Cu Electrodes Resulting from the Reduction of Thick Cu 2 O Films

Li, Christina W., Kanan, Matthew W.·2012·Journal of the American Chemical Society

Abstract

Modified Cu electrodes were prepared by annealing Cu foil in air and electrochemically reducing the resulting Cu(2)O layers. The CO(2) reduction activities of these electrodes exhibited a strong dependence on the initial thickness of the Cu(2)O layer. Thin Cu(2)O layers formed by annealing at 130 °C resulted in electrodes whose activities were indistinguishable from those of polycrystalline Cu. In contrast, Cu(2)O layers formed at 500 °C that were ≥~3 μm thick resulted in electrodes that exhibited large roughness factors and required 0.5 V less overpotential than polycrystalline Cu to reduce CO(2) at a higher rate than H(2)O. The combination of these features resulted in CO(2) reduction geometric current densities >1 mA/cm(2) at overpotentials <0.4 V, a higher level of activity than all previously reported metal electrodes evaluated under comparable conditions. Moreover, the activity of the modified electrodes was stable over the course of several hours, whereas a polycrystalline Cu electrode exhibited deactivation within 1 h under identical conditions. The electrodes described here may be particularly useful for elucidating the structural properties of Cu that determine the distribution between CO(2) and H(2)O reduction and provide a promising lead for the development of practical catalysts for electrolytic fuel synthesis.

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Crossref · 10.1021/ja3010978

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Authors
Li, C. W., & Kanan, M. W.
Affiliations
Stanford University (US)
Corresponding author
Kanan, Matthew W.
Venue
Journal of the American Chemical Society
Published
2012-04-20
Volume
134
Issue
17
Pages
7231-7234
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
OpenAlex
W2082498048
Cited by
2,000
References
29
Citations by year
2026: 84 · 2025: 109 · 2024: 126 · 2023: 128 · 2022: 168 · 2021: 189 · 2020: 235 · 2019: 194 · 2018: 210 · 2017: 181 · 2016: 155 · 2015: 105 · 2014: 64 · 2013: 44 · 2012: 8
FWCI
27.14
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of the American Chemical Society (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Science Foundation
  • Stanford Precourt Institute for Energy
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 › Chemical Engineering › Catalysis › Catalysts for Methane Reforming
Keywords
CO2 reduction, copper electrode, low overpotential, electrode surface roughness, film thickness dependence, annealing temperature, electrode deactivation, electrocatalysis

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