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Unveiling a Two-Electron Reaction Pathway for Electrocatalytic CO2 Reduction on Boron-Doped Diamonds: A

Chuyan Zhang1, Bin Chen1, Zhaofeng Zhai1,2

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Summary

Converting CO2 into formic acid (HCOOH) is key for sustainable fuels. This study uses density functional theory to reveal the BDD electrode mechanism, identifying optimal doping for efficient HCOOH production.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Electrochemical conversion of carbon dioxide (CO2) to formic acid (HCOOH) offers a sustainable route for liquid fuel and hydrogen storage.
  • The precise reaction mechanism for this two-electron pathway remains debated.
  • Boron-doped diamond (BDD) electrodes show high selectivity for HCOOH production, prompting further investigation.

Purpose of the Study:

  • To elucidate the CO2 adsorption and initial two-electron reaction mechanism on BDD electrodes with varying boron doping configurations.
  • To identify the key factors governing the high selectivity of BDD for HCOOH synthesis.
  • To provide a detailed understanding of the two-electron reaction pathway mechanisms.

Main Methods:

  • Density functional theory (DFT) calculations were employed to model CO2 adsorption and reaction pathways on BDD surfaces.
  • Analysis of B doping configurations and their impact on electronic structure and adsorption energies.
  • Climbing image-nudged elastic band (CI-NEB) method was used to study dynamic kinetics under an external electric field.

Main Results:

  • CO2 adsorption is favored at surface B doping sites with charge transfer, forming B-O bonds.
  • A Volcano relationship was observed between the overpotential and the Gibbs energy of the *CO2-*COOH step.
  • The partially sp2-C hybridized (111) (2 × 1) BDD configuration demonstrated the lowest overpotential (0.81 eV), indicating superior CO2 reduction to HCOOH.
  • A negative electric field (-0.4 eV/Å) was found to promote CO2 and *H adsorption but hinder *H migration.

Conclusions:

  • The study identifies specific B doping configurations on BDD as crucial for high CO2 selectivity towards HCOOH.
  • The findings clarify the mechanism of CO2 reduction on BDD, highlighting the role of charge transfer and electronic structure.
  • This research provides fundamental insights into optimizing BDD electrodes for efficient electrochemical CO2 conversion into valuable products.