Stable Universal-pH Electrocatalytic Strategy for Efficient Organic Mineralization via Sustained Hydroxyl Radical...

Area of Science:

• Environmental Science
• Electrochemistry
• Materials Science

Background:

• Wastewater purification is vital for environmental and human health.
• Efficient electrocatalysts for hydroxyl radical (•OH) generation are needed for pollutant mineralization across all pH.
• Conventional anodes (PbO2, SnO2, IrO2, RuO2) have limitations in pH range, stability, or efficiency.

Purpose of the Study:

• To develop a universal-pH electrochemical reactor for efficient •OH generation.
• To overcome the pH limitations of existing electrocatalysts for wastewater treatment.
• To investigate the performance and mechanism of a novel metalloidal boron/diamond matrix (MB/DM) anode.

Main Methods:

• Development of a novel metalloidal boron/diamond matrix (MB/DM) anode.
• Testing the electrochemical reactor's performance over an ultrawide pH range (0-14).
• Density functional theory (DFT) calculations to elucidate pH-dependent reaction pathways.

Main Results:

• The MB/DM anode achieved efficient •OH generation with exceptional long-term stability from pH 0 to 14.
• The anode demonstrated high oxygen evolution overpotential, promoting •OH accumulation.
• DFT calculations confirmed sustained •OH generation kinetics across the pH range.

Conclusions:

• The novel MB/DM anode overcomes the pH limitation in electrochemical water remediation.
• This universal-pH system provides a reliable platform for treating diverse industrial wastewaters.
• The findings offer a significant advancement in electrocatalytic wastewater treatment technology.