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Electrochemical CO2 reduction to formate using renewable electricity provides a promising strategy to product value-added carbon-based fuels and feedstocks. However, it still remains a grand challenge to further reduce the cathodic potentials and increase current density for the large-scale practical applications of formate. Herein, we report that spontaneously Sn doped Bi/BiOx nanowires (denoted as Bi/Bi(Sn)Ox NWs) are prepared from electrochemical dealloying strategy. The Bi/Bi(Sn)Ox NWs exhibit impressive CO2 electroreduction activity to formate with a Faradaic efficiency (FE) > 92% from -0.5 to -0.9 V versus reversible hydrogen electrode (RHE), and achieve a current density of 301.4 mA cm-2 at -1.0 V vs. RHE under gas diffusion cell configuration. In-situ Raman spectroscopy and theory calculations reveal that the incorporation of Sn atoms into BiOx species modulates the electron states of Bi, allowing the *OCHO intermediate to favorably adsorb onto the reconstructed Bi(Sn)Ox surface while promotes formate generation by suppressing the competitive hydrogen evolution reaction. This work provides effective in-situ construction of the metal/metal oxide hybrid composites with heteroatom doping and offers insights in promoting practical CO2 conversion technology.
Keywords
electrochemical CO2 reduction, nanowires, CO2 conversion
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This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Article
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Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
History
CURRENT STATUS: Posted
Version 1
Posted 08 Mar, 2021
No community comments so far
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Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Electrochemical CO2 reduction to formate using renewable electricity provides a promising strategy to product value-added carbon-based fuels and feedstocks. However, it still remains a grand challenge to further reduce the cathodic potentials and increase current density for the large-scale practical applications of formate. Herein, we report that spontaneously Sn doped Bi/BiOx nanowires (denoted as Bi/Bi(Sn)Ox NWs) are prepared from electrochemical dealloying strategy. The Bi/Bi(Sn)Ox NWs exhibit impressive CO2 electroreduction activity to formate with a Faradaic efficiency (FE) > 92% from -0.5 to -0.9 V versus reversible hydrogen electrode (RHE), and achieve a current density of 301.4 mA cm-2 at -1.0 V vs. RHE under gas diffusion cell configuration. In-situ Raman spectroscopy and theory calculations reveal that the incorporation of Sn atoms into BiOx species modulates the electron states of Bi, allowing the *OCHO intermediate to favorably adsorb onto the reconstructed Bi(Sn)Ox surface while promotes formate generation by suppressing the competitive hydrogen evolution reaction. This work provides effective in-situ construction of the metal/metal oxide hybrid composites with heteroatom doping and offers insights in promoting practical CO2 conversion technology.
Figure 1
Figure 2
Figure 3
Figure 4
The full text of this article is available to read as a PDF.
There is NO Competing Interest.
This is a list of supplementary files associated with this preprint. Click to download.
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