Efficient CO₂ Reduction Reaction on Cu-Decorated Biphenylene.

Area of Science:

• Materials Science
• Catalysis
• Computational Chemistry

Background:

• Efficient electrocatalysts are vital for converting carbon dioxide (CO2) into valuable products, supporting a green economy.
• Two-dimensional (2D) materials decorated with copper (Cu) show promise for catalytic applications.
• Biphenylene (BPH), a recently synthesized 2D material, presents a novel platform for catalyst design.

Purpose of the Study:

• To investigate the potential of pristine, defective, and Cu-decorated biphenylene (BPH) for electrocatalytic CO2 reduction.
• To understand the CO2 adsorption and reaction mechanisms on these BPH-based materials.
• To evaluate Cu-decorated BPH as a single-atom catalyst (SAC) for producing C1 hydrocarbons.

Main Methods:

• Density Functional Theory (DFT) calculations were employed to study CO2 adsorption and reaction pathways.
• Molecular dynamics (MD) simulations were used to assess the kinetic stability of Cu atoms on BPH.
• Calculations of binding energies (Eb) and rate-limiting potentials (UL) were performed to determine catalytic efficiency.

Main Results:

• Pristine BPH exhibits weak CO2 adsorption, indicating low reactivity.
• Carbon single-vacancy defects in BPH lead to strong CO2 binding (-3.23 eV), hindering the reaction.
• Cu-decorated BPH acts as a stable SAC, with CO2 adsorption energy of -0.52 eV.
• The carboxylic pathway on Cu-BPH shows a lower rate-limiting potential (0.32 eV) for CH3OH production compared to the formate pathway (0.39 eV for HCOOH).

Conclusions:

• Cu-decorated BPH demonstrates significant potential as an efficient single-atom catalyst for CO2 electroreduction to C1 products.
• The catalytic performance of Cu-BPH surpasses that of traditional Cu-based catalysts.
• This study highlights Cu-BPH as a promising electrocatalyst for CO2 reduction reactions (CRR).