Co-based Catalysts for Selective H₂ O₂ Electroproduction via 2-electron Oxygen Reduction Reaction

Area of Science:

• Electrochemistry
• Materials Science
• Chemical Engineering

Background:

• Electrochemical hydrogen peroxide (H2O2) production offers a sustainable alternative to the traditional anthraquinone process.
• Developing efficient, cost-effective, and robust electrocatalysts is crucial for advancing H2O2 electrosynthesis.
• Cobalt-based catalysts are of significant interest due to their abundance and high selectivity for the two-electron oxygen reduction reaction (ORR).

Purpose of the Study:

• To provide a comprehensive review of Co-based electrocatalysts for H2O2 electrosynthesis.
• To discuss the fundamental chemistry of the two-electron ORR to guide catalyst design.
• To summarize recent progress in Co-based electrocatalyst development and identify future research directions.

Main Methods:

• Reviewing literature on Co-based electrocatalysts for H2O2 production.
• Analyzing the fundamental chemistry of the two-electron oxygen reduction reaction (ORR).
• Summarizing advancements in Co-based nanoparticles, compounds, and single-atom catalysts.

Main Results:

• Co-based catalysts show significant potential for efficient and selective H2O2 electrosynthesis.
• Understanding active sites, structure, and reaction mechanisms is key to optimizing catalyst performance.
• Various forms of Co-based catalysts, including nanoparticles, compounds, and single-atom catalysts, have been explored.

Conclusions:

• Co-based electrocatalysts are a viable and promising avenue for sustainable H2O2 production.
• Further research is needed to address current challenges and optimize catalyst design and application.
• Continued investigation into active site identification, structure-regulation, and mechanism understanding will drive future advancements.