Dual-metal sites for the control over reactive oxygen species generation: singlet oxygen and hydroxyl radical.

The CoFe-NC@CA-NF integrated electro-Fenton electrode enables complete sulfamethoxazole degradation within 120 min by concurrently generating singlet oxygen (1O2) and hydroxyl radical (•OH) from in-situ H2O2.

• Why it matters: Reactive oxygen species control is a bottleneck for heterogeneous electro-Fenton systems, where limited degradation and weak anti-interference in complex matrices hinder durable, efficient pollutant removal.
• What they did: The authors built a self-supported CoFe-NC@CA-NF electrode on nickel foam with carbon aerogel coating, using dual-metal sites to drive two-electron oxygen reduction to H2O2 and then dual ROS formation.
• The result: Fe coordination in CoFe-NC@CA-NF optimizes Co electronic structure and intermediate adsorption, yielding strong performance across pH 3–11 and against various recalcitrant organics with notable anti-interference.

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