4.6 Article

Electrochemical reduction of CO2 on fluorine-modified boron-doped diamond electrode

Journal

DIAMOND AND RELATED MATERIALS
Volume 121, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2021.108753

Keywords

Boron-doped diamond; F-BDD; CO2; Electrochemical reduction; Formaldehyde

Funding

  1. Basic Research Funding for Breeding Project of Sichuan University [2019-21]
  2. Fundamental Research Funds for the Central Universities [20826041C4202]
  3. Experimental Technology Project of Sichuan University [SCU201204, SCU201207]

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Fluorine-containing diamond was successfully deposited onto a boron-doped diamond (BDD) substrate using the HFCVD process, resulting in a fluorine-modified BDD (F-BDD) electrode. The F-BDD electrode exhibited high efficiency in formaldehyde (HCHO) generation during CO2 reduction, with improved stability and anti-contamination properties compared to the BDD electrode.
Fluorine-containing diamond was deposited onto boron-doped diamond (BDD) substrate in the hot-filament chemical vapor deposition (HFCVD) process. The carbon source composed of acetone and trimethyl borate was mixed with hexafluoropropylene and then used to prepare a fluorine-modified BDD (F-BDD) film. X-ray photoelectron spectroscopy (XPS) and contact angle (CA) measurement were employed to characterize the film surface. Electrochemical reduction of CO2 was performed on the F-BDD electrode in a three-electrode cell in NaCl electrolyte. The Faradaic efficiency of formaldehyde (HCHO) generation on the electrode surface in CO2 reduction was measured and analyzed. The fluorinated surface decreased the adsorption of foreign species, stabilizing the F-BDD electrode. Scanning electron microscope (SEM) was used to observe the chemical contamination on the electrode surface in the reductive circumstance. In comparison with the substrate BDD electrode, the F-BDD electrode was found to be highly durable after a long reduction process because of its improved chemical stability and anti-contamination properties.

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