A Protocol for Electrocatalyst Stability Evaluation: H₂O₂ Electrosynthesis for Industrial Wastewater Treatment

Area of Science:

• Environmental Science
• Electrochemistry
• Materials Science

Background:

• Electrocatalysis offers a promising route for wastewater treatment and reuse.
• Current research focuses heavily on catalyst material development, neglecting crucial stability assessments and deactivation mechanisms.

Purpose of the Study:

• To develop a rapid protocol for identifying detrimental wastewater constituents affecting electrocatalyst performance.
• To elucidate the mechanisms behind electrocatalyst deactivation in industrial effluent.

Main Methods:

• Electrochemical investigation of synthesized catalysts in electrolytes mimicking industrial wastewater.
• Sequential chronopotentiometric stability tests under increasingly harsh conditions.
• Oxidized carbon black used as a model catalyst for hydrogen peroxide electrosynthesis.

Main Results:

• The developed protocol effectively identifies key pollutants impacting electrocatalyst function.
• Magnesium and zinc were identified as significant metal pollutants causing severe losses in catalyst activity and selectivity.
• Deactivation phenomena were elucidated through systematic stability testing.

Conclusions:

• The protocol provides a timely method for assessing electrocatalyst suitability for real-world wastewater treatment.
• Understanding pollutant impacts is crucial for advancing electrocatalyst technology from lab-scale to industrial application.
• This work facilitates the practical implementation of electrocatalysis in industrial water purification and reuse.