Hierarchical Modulation in Cu-Aerogel Enables Breakthrough CO₂ Electroreduction for Combating...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• The electroreduction of carbon dioxide (CO2) is critical for sustainable energy solutions.
• Achieving high selectivity, efficiency, and stability in CO2 electroreduction catalysts remains a significant challenge due to the inherent tradeoffs.
• Developing advanced electrocatalysts is essential for efficient CO2 conversion.

Purpose of the Study:

• To design a novel copper-based electrocatalyst with enhanced performance for CO2 electroreduction.
• To address the stability-efficiency-selectivity tradeoff in CO2 electroreduction.
• To investigate the synergistic effects of Boron and Tin integration in a copper aerogel structure.

Main Methods:

• Hierarchical modulation strategy for precise assembly of Boron (B) and Tin (Sn) within a copper (Cu)-aerogel framework (BSnCu3).
• Characterization of the BSnCu3 structure to understand its hierarchical properties.
• Electrochemical testing to evaluate CO2 electroreduction performance, including selectivity, Faradaic efficiency, overpotential, and stability.

Main Results:

• The BSnCu3 catalyst demonstrated exceptional ethanol selectivity (93.2%) and Faradaic efficiency (90.3%).
• An ultralow overpotential of 0.12 V was achieved, indicating high energy efficiency.
• The catalyst exhibited remarkable stability and a record-breaking tradeoff index of 2.74.

Conclusions:

• The hierarchical BSnCu3 electrocatalyst effectively overcomes the stability-efficiency-selectivity tradeoff in CO2 electroreduction.
• Synergistic effects of Boron and Tin, along with the 3D nanowire network, contribute to superior catalytic performance.
• This work presents a promising strategy for designing advanced electrocatalysts for CO2 conversion.