Bioinspired Hydrophobicity for Enhancing Electrochemical CO₂ Reduction

Area of Science:

• Electrochemistry
• Materials Science
• Chemical Engineering

Background:

• Electrochemical carbon dioxide reduction (CO2 R) offers a sustainable route for converting CO2 into valuable products using renewable energy.
• Optimizing the microenvironment at the CO2 -electrolyte-catalyst interface is crucial for improving CO2 R performance, including current density, Faradaic efficiency (FE), and operational stability.
• The plastron effect observed on natural hydrophobic surfaces inspires strategies for concentrating CO2 at the catalyst site.

Purpose of the Study:

• To review CO2 enrichment strategies for enhancing electrochemical carbon dioxide reduction (CO2 R).
• To explore how wettability modulation and superwettability systems, inspired by nature, can concentrate CO2 for improved CO2 R.
• To discuss complementary CO2 enrichment approaches involving catalysts, electrolytes, and electrolyzer designs.

Main Methods:

• Review of scientific literature on CO2 enrichment strategies for CO2 R.
• Analysis of natural superwettability phenomena and their application to CO2 R.
• Exploration of catalyst, electrolyte, and electrolyzer modifications for enhanced CO2 concentration.

Main Results:

• Wettability modulation and superwettability offer promising avenues for concentrating CO2 at the interface.
• Various strategies targeting catalysts, electrolytes, and electrolyzers can complement hydrophobicity-based approaches.
• Effective CO2 enrichment significantly impacts CO2 R performance metrics like FE and stability.

Conclusions:

• Nature-inspired CO2 enrichment strategies, particularly those involving wettability, can substantially boost CO2 R.
• A holistic approach combining catalyst design, electrolyte engineering, and electrolyzer configuration is key for practical CO2 R.
• Further research into CO2 enrichment holds significant potential for advancing CO2 R technology towards industrial viability.