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Phase-Controlled Multi-Element Oxide-Sulfide Heterostructure Toward High-Efficiency Electro-Fenton Oxidation.

Yemima Purba¹, Fitri Nur Indah Sari¹, Xuan-Yu Wei¹

¹Department of Materials Science and Engineering, National Cheng Kung University, No. 1 University Road, Tainan, 70101, Taiwan.

|September 11, 2025

Summary

This summary is machine-generated.

A novel oxide-sulfide heterostructure catalyst efficiently degrades pollutants using electron Fenton (EF) processes. This multi-metal catalyst enhances hydrogen peroxide electrosynthesis and iron regeneration for effective wastewater treatment.

Keywords:

Fe3⁺/Fe2⁺ reversibility H2O2 selectivity co‐existence of Ov/surface sulfide heterogeneous electro‐Fenton oxide‐sulfide heterostructure

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Area of Science:

Materials Science
Environmental Chemistry
Electrochemistry

Background:

Electron Fenton (EF) degradation is limited by inefficient in situ hydrogen peroxide (H₂O₂) electrosynthesis and Fe²⁺ regeneration.
Developing stable and efficient catalysts is crucial for advancing EF technology in wastewater treatment.

Purpose of the Study:

To develop a novel multi-element oxide-sulfide heterostructure catalyst for enhanced EF degradation.
To optimize the catalyst's performance through controlled synthesis and understand the underlying mechanisms.

Main Methods:

Synthesis of a multi-element oxide-sulfide heterostructure (FeVCoCuMn)₂O₃/(CuFeVCoMn)S with optimized phase ratio via temperature control.
Experimental characterization and Density Functional Theory (DFT) calculations to analyze catalyst properties.
Performance evaluation using tetracycline degradation in EF process and stability testing over multiple cycles.

Main Results:

The optimized (FeVCoCuMn)₂O₃/(CuFeVCoMn)S heterostructure significantly improved H₂O₂ electrosynthesis and Fe²⁺ regeneration compared to subsystems.
DFT calculations confirmed enhanced charge transfer and optimized intermediate binding within the heterostructure.
Achieved 98% tetracycline degradation within 120 minutes and maintained 87% efficiency over ten cycles.

Conclusions:

The multi-element oxide-sulfide heterostructure is a highly efficient and stable catalyst for EF wastewater treatment.
Synergistic effects of multi-metal doping and heterostructure design are key to superior catalytic performance.
This study offers valuable insights for designing advanced heterogeneous EF catalysts.