Efficient H₂O₂ Synthesis Through a Two-Electron Oxygen Reduction Reaction by Electrocatalysts

Area of Science:

• Electrochemistry
• Materials Science
• Sustainable Chemistry

Background:

• The two-electron oxygen reduction reaction (2e-ORR) offers a sustainable route for hydrogen peroxide (H₂O₂) production, presenting an alternative to the energy-intensive anthraquinone process.
• Developing efficient electrocatalysts is crucial for advancing localized H₂O₂ synthesis, emphasizing the need for high activity, selectivity, and stability.

Purpose of the Study:

• This review comprehensively summarizes recent progress in electrocatalyst development for in-situ H₂O₂ production via the 2e-ORR pathway.
• It aims to provide a detailed overview of catalyst design, fabrication, and the investigation of active sites influencing H₂O₂ selectivity.

Main Methods:

• The review analyzes various classes of electrocatalysts, including pure metals/alloys, transition metal compounds, single-atom catalysts, and carbon-based materials.
• It discusses the design principles and fabrication strategies for these catalysts tailored for the 2e-ORR.

Main Results:

• Recent advancements have shown significant potential in various electrocatalyst types for efficient H₂O₂ electrosynthesis.
• Understanding catalytic mechanisms and active sites is vital for optimizing selectivity and stability in the 2e-ORR.

Conclusions:

• Significant challenges and opportunities exist in H₂O₂ electrosynthesis, requiring further research into catalyst design and reaction mechanisms.
• Future research should focus on enhancing electrocatalyst performance and exploring novel materials for efficient and sustainable H₂O₂ production.