Cited by 1,728CO2 Reduction Techniques and CatalystsCatalysts for Methane ReformingElectrocatalysts for Energy Conversion

Electroreduction of carbon monoxide to liquid fuel on oxide-derived nanocrystalline copper

Li, Christina W., Ciston, Jim, Kanan, Matthew W.·2014·Nature

Abstract

The electrochemical conversion of CO2 and H2O into liquid fuel is ideal for high-density renewable energy storage and could provide an incentive for CO2 capture. However, efficient electrocatalysts for reducing CO2 and its derivatives into a desirable fuel are not available at present. Although many catalysts can reduce CO2 to carbon monoxide (CO), liquid fuel synthesis requires that CO is reduced further, using H2O as a H(+) source. Copper (Cu) is the only known material with an appreciable CO electroreduction activity, but in bulk form its efficiency and selectivity for liquid fuel are far too low for practical use. In particular, H2O reduction to H2 outcompetes CO reduction on Cu electrodes unless extreme overpotentials are applied, at which point gaseous hydrocarbons are the major CO reduction products. Here we show that nanocrystalline Cu prepared from Cu2O ('oxide-derived Cu') produces multi-carbon oxygenates (ethanol, acetate and n-propanol) with up to 57% Faraday efficiency at modest potentials (-0.25 volts to -0.5 volts versus the reversible hydrogen electrode) in CO-saturated alkaline H2O. By comparison, when prepared by traditional vapour condensation, Cu nanoparticles with an average crystallite size similar to that of oxide-derived copper produce nearly exclusive H2 (96% Faraday efficiency) under identical conditions. Our results demonstrate the ability to change the intrinsic catalytic properties of Cu for this notoriously difficult reaction by growing interconnected nanocrystallites from the constrained environment of an oxide lattice. The selectivity for oxygenates, with ethanol as the major product, demonstrates the feasibility of a two-step conversion of CO2 to liquid fuel that could be powered by renewable electricity.

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Crossref · 10.1038/nature13249

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Authors
Li, C. W., Ciston, J., & Kanan, M. W.
Affiliations
  • Stanford University (US)
  • Lawrence Berkeley National Laboratory (US)
Corresponding author
Kanan, Matthew W.
Venue
Nature
Published
2014-04
Volume
508
Issue
7497
Pages
504-507
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W1991003106
Cited by
1,728
References
32
Citations by year
2026: 86 · 2025: 122 · 2024: 153 · 2023: 174 · 2022: 158 · 2021: 182 · 2020: 183 · 2019: 190 · 2018: 151 · 2017: 135 · 2016: 93 · 2015: 76 · 2014: 23
FWCI
35.86
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
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, liquid fuel synthesis, oxide-derived copper, nanocrystalline copper, copper oxide, ethanol production, acetate, 1-propanol, hydrogen evolution suppression, Faradaic efficiency, renewable energy storage, CO2 capture, alkaline water electrolysis

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