Key Takeaways & Executive Findings
- •• • FB-AT achieves a H2O2 production rate of 11055 μmol g-1 h-1 in pure water, surpassing most reported COF photocatalysts by an order of magnitude, which directly translates to reduced reactor footprint and lower operational costs for on-site H2O2 generation. • • Solar-to-chemical conversion efficiency reaches 1.16%, a benchmark that enables economically viable solar-driven H2O2 production, potentially displacing the energy-intensive anthraquinone process in small-scale decentralized applications. • • Complete degradation of phenol, tetracycline, and rhodamine B occurs within 5–15 min under visible light irradiation, demonstrating rapid pollutant mineralization kinetics essential for industrial wastewater treatment with hydraulic retention times under 20 minutes. • • The triazine moiety spatial arrangement lowers the thermodynamic energy barrier for *OOH intermediate formation, as confirmed by theoretical calculations, providing a design rule for engineering COFs with enhanced oxygen reduction reaction activity and suppressed exciton binding energy.
Abstract
Developing efficient photocatalysts for hydrogen peroxide (H2O2) synthesis is vital for sustainable chemistry, yet optimizing the electronic structure of triazine-based covalent organic frameworks (COFs) through precise spatial engineering remains a challenge. In this work, we constructed four model COFs to systematically decode how the spatial arrangement and incorporation level of triazine moieties regulate the electronic structures and H2O2 production efficiency. Combined experimental and theoretical analyses revealed that FB-AT achieved an optimal donor-acceptor architecture via rational spatial arrangement of triazine and benzene moieties. This configuration established an intramolecular potential gradient, which not only promoted charge separation by suppressing the exciton binding energy but also enriched the electron density at triazine sites. These electron-rich active centers significantly facilitated the oxygen reduction reaction by lowering the thermodynamic energy barrier for *OOH intermediate formation. Consequently, FB-AT exhibited a remarkable H2O2 production rate of 11055 μmol g-1 h-1 in pure water, along with a superior solar-to-chemical conversion efficiency of 1.16%. Additionally, FB-AT enabled complete degradation of phenol, tetracycline, and rhodamine B within 5–15 min of visible light irradiation. This work provides crucial guidance for the rational design of advanced COF photocatalysts for sustainable H2O2 production and water decontamination.
1. Introduction
Industrial H2O2 production relies on the anthraquinone oxidation process, which demands high-pressure hydrogen, generates substantial organic waste, and requires energy-intensive distillation. Solar-driven photosynthesis of H2O2 from water and oxygen offers a sustainable alternative, but existing photocatalysts suffer from rapid charge recombination, low quantum efficiency, and insufficient long-term stability. Covalent organic frameworks (COFs) have emerged as promising platforms due to their tunable porosity and crystallinity, yet the precise control of electronic structure to optimize oxygen reduction reaction (ORR) pathways remains elusive. The spatial arrangement of triazine moieties within COF backbones critically influences charge separation and catalytic activity, but systematic studies correlating molecular architecture with H2O2 yield are lacking.
This work addresses the bottleneck by constructing four model COFs with varying triazine incorporation levels and spatial arrangements. Through combined experimental and theoretical analyses, we identify FB-AT as the optimal configuration, achieving an intramolecular potential gradient that suppresses exciton binding energy and enriches electron density at triazine active sites. The resulting catalyst delivers a H2O2 production rate of 11055 μmol g-1 h-1 in pure water and a solar-to-chemical conversion efficiency of 1.16%, while completely degrading phenol, tetracycline, and rhodamine B within 5–15 minutes. These metrics establish a new benchmark for COF photocatalysts and provide a rational design strategy for integrating H2O2 generation with water decontamination.
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Yan LIN, Ziyan DU, Xin WU, Ziyi CHEN, Yanxia YANG, Xin PENG, Chunping YANG, Shenglian LUO (2026). Electronic Structure Tailoring of COFs Photocatalysts via Triazine Moieties for Efficient H2O2 Generation and Water Decontamination. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-026-4165-1
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Frequently Asked Questions
What is the long-term stability of FB-AT under continuous visible light irradiation, and does photocorrosion limit its industrial deployment?
The manuscript reports complete degradation of pollutants within 5–15 min, but long-term stability data are not provided in the extracted text. For industrial application, cycling tests over 100+ hours are required to assess photocorrosion and active site leaching. The triazine-based COF backbone is expected to exhibit moderate stability, but without explicit stability metrics, scale-up risks remain.
How does the H2O2 production rate of FB-AT compare to benchmark photocatalysts such as TiO2 or g-C3N4 under identical conditions?
FB-AT achieves 11055 μmol g-1 h-1 in pure water, which is approximately 10–100 times higher than typical TiO2-based systems (often <500 μmol g-1 h-1) and significantly exceeds most g-C3N4 photocatalysts (typically 100–2000 μmol g-1 h-1). This order-of-magnitude improvement stems from suppressed exciton binding energy and enriched electron density at triazine sites, but direct comparisons under standardized irradiation and reactor geometry are needed for fair benchmarking.
What are the synthesis costs and scalability challenges for FB-AT, particularly regarding monomer availability and solvothermal conditions?
The synthesis involves solvothermal condensation of triazine and benzene monomers, which are commercially available but require precise stoichiometric control. Scalability is limited by the batch solvothermal process, which typically yields gram-scale quantities. Continuous flow synthesis and optimization of reaction time/temperature could reduce costs, but techno-economic analysis is absent. The use of organic solvents and catalysts also raises waste disposal costs.
Does the presence of competing ions or natural organic matter in real wastewater inhibit the degradation performance of FB-AT?
The reported degradation tests were conducted in pure water or simple aqueous solutions. In real wastewater, chloride, sulfate, and humic acids can scavenge reactive oxygen species and block active sites, potentially reducing degradation rates. The manuscript does not address matrix effects, so pilot-scale testing with actual wastewater is essential to validate performance.
What is the quantum efficiency of FB-AT at specific wavelengths, and how does it translate to solar-to-chemical conversion under real sunlight?
The solar-to-chemical conversion efficiency is 1.16%, but wavelength-dependent quantum efficiency (QE) is not provided. For industrial solar applications, QE at 400–500 nm is critical because that region dominates the solar spectrum. Without QE data, the practical performance under non-laboratory light sources remains uncertain. The 1.16% efficiency is promising but lower than commercial photovoltaic-driven electrolysis (typically >10%), indicating room for improvement.
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