Hydrogen peroxide (H2O2) is a "Top 100" global chemical essential for wastewater treatment, healthcare sterilization, and green chemical synthesis. However, the traditional industrial "anthraquinone process" is plagued by high energy consumption and significant safety risks during the transportation of high-concentration solutions.
In a comprehensive review published in the journal ENGINEERING Energy , researchers from the Beijing University of Chemical Technology (BUCT) have charted a transformative path toward the sustainable, on-site production of H2O2 through the two-electron oxygen reduction reaction (2e- ORR).
A "Generate-and-Use" Paradigm The 2e- ORR process allows for the electrochemical synthesis of dilute H2O2 directly from oxygen and water under mild conditions. This "generate-and-use" approach eliminates the need for hazardous storage and long-distance transport, making it a game-changer for remote areas and decentralized industrial applications.
"The core challenge lies in designing catalysts that are not only active but also highly selective," says Professor Yongjun Feng, one of the corresponding authors of the study. "We must prevent the oxygen from over-reducing into water—a competing four-electron process—and instead stabilize the key intermediate, *OOH, to ensure the production of hydrogen peroxide."
Key Advances in Catalyst Engineering The review provides a systematic analysis of three primary classes of electrocatalysts that are driving this field forward:
- Noble Metal-Based Catalysts: Alloys like Pt-Hg and Au-Pd have demonstrated near-perfect selectivity by tuning the adsorption energy of reaction intermediates through synergistic bimetallic effects.
- Carbon-Based Nanomaterials: As cost-effective alternatives, carbon materials engineered with heteroatom doping (such as Nitrogen, Boron, or Phosphorus) and specific surface defects have shown remarkable efficiency. The study highlights how "end-on" oxygen adsorption on these surfaces is crucial for maintaining the O-O bond integrity required for H2O2.
- Transition Metal Compounds: Single-atom catalysts (SACs) and transition metal chalcogenides (TMCs) are emerging as high-performance, earth-abundant candidates. Notable breakthroughs include zirconium nitride-based catalysts that can produce H2O2 directly from ambient air with long-term stability.
Practical Impact and Future Outlook The implications of this research extend far beyond the laboratory. The review discusses how these advanced catalysts are already being integrated into "Heterogeneous Fenton" systems to degrade refractory organic pollutants in wastewater more efficiently than ever before.
While challenges remain regarding the long-term durability of non-noble metal catalysts in acidic environments, the researchers are optimistic. This comprehensive framework provides a foundational roadmap for the next generation of catalyst design, aiming to make electrochemical H2O2 synthesis an industrial reality.
JOURNAL: ENGINEERING Energy
DOI: https://doi.org/10.1007/s11708-026-1054-4
Article Link: https://link.springer.com/article/10.1007/s11708-026-1054-4
Cite this article: Xu, Q., Li, X., Xiu, W., Meng, L., Li, C., & Feng, Y. (2026). Advances in electrocatalysts for the two-electron oxygen reduction reaction to produce hydrogen peroxide. ENGINEERING Energy, 20(1), 10544. https://doi.org/10.1007/s11708-026-1054-4
