Efficient H₂O₂ Electrosynthesis in Acidic media via Multiscale Catalyst Optimization

Area of Science:

• Electrochemistry
• Materials Science
• Chemical Engineering

Background:

• Electrochemical hydrogen peroxide (H2O2) production is a sustainable alternative to the anthraquinone process.
• H2O2 stability and efficiency are challenges in alkaline and neutral electrolytes.
• Acidic electrolytes offer stability but face kinetic limitations in oxygen reduction.

Purpose of the Study:

• To develop an efficient and stable electrochemical H2O2 production method in acidic electrolytes.
• To overcome kinetic limitations of the oxygen reduction reaction in acidic media.
• To design a catalyst with enhanced active sites and macrostructure.

Main Methods:

• Utilized a multiscale approach combining active site and macrostructure tuning.
• Synthesized an octahedron-like cobalt structure on interconnected hierarchical porous nanofibers.
• Evaluated catalyst performance using electrochemical techniques at industrial-relevant current densities.

Main Results:

• Achieved a faradaic efficiency exceeding 80% at 400 mA cm-2.
• Demonstrated stable operation for over 120 hours at 100 mA cm-2.
• Obtained a 26% energy efficiency at 300 mA cm-2 with a cell potential of 2.14 V.

Conclusions:

• The developed cobalt catalyst significantly enhances H2O2 production efficiency and stability in acidic media.
• The multiscale tuning approach is effective for optimizing electrocatalyst performance.
• This work paves the way for scalable and cost-effective electrochemical H2O2 synthesis.