ACS Catalysis· 2026Q1
Efficient Photocatalytic H2O2 Formation by a Porphyrin-TiO2 Hybrid Catalyst in Pure Water
- 1citations
- Q1SCImago
- 2026year
Short summary
A novel porphyrin-TiO2 hybrid catalyst (H4DPP2+-C/TiO2) achieves a record 27% external quantum yield for H2O2 production in pure water, forming 0.30 mM H2O2 in 1 minute with an initial rate of 29 mmol g–1 h–1.
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Key points
- Developed a porphyrin-TiO2 hybrid catalyst (H4DPP2+-C/TiO2) for photocatalytic H2O2 production.
- Achieved 0.30 mM H2O2 concentration after 1 minute of photoirradiation in ultrapure water.
- Reported an initial H2O2 formation rate of 29 mmol g–1 h–1, higher than previous values in pure water.
- Attained a record external quantum yield of 27% at 365 nm for semiconductor photocatalysts producing H2O2.
- Mechanism involves electron transfer from photoexcited TiO2 to the porphyrin moiety for O2 reduction.
AI-generated from the title and abstract; the full text is not read.
Abstract
Abstract Efficient production of hydrogen peroxide (H2O2) has attracted much interest because of the growing importance of H2O2 as an energy source. In this study, we have developed photocatalytic H2O2 production in ultrapure water catalyzed by an organic–inorganic hybrid photocatalyst. The hybrid photocatalyst was prepared by immobilizing a diprotonated dodecaphenylporphyrin derivative (H4DPP2+-C) having carboxyl groups at the periphery to be anchored on a TiO2 surface. Photoirradiation to the hybrid photocatalyst (H4DPP2+-C/TiO2) dispersed in ultrapure water resulted in efficient H2O2 production by O2 reduction, as confirmed by iodometry for the supernatant. The concentration of aqueous H2O2 was determined to be 0.30 mM after 1 min of photoirradiation and the initial rate of H2O2 formation by H4DPP2+-C/TiO2 was determined to be 29 mmol g–1 h–1, which was higher than previously reported values in ultrapure water without any sacrificial reagents. In addition, the external quantum yield at 365 nm reached 27%, which is the highest value among semiconductor photocatalysts for H2O2 production. Based on the results from femtosecond transient reflectance spectroscopy, photoinduced electron transfer from the conduction band of photoexcited TiO2 to H4DPP2+-C on TiO2 was confirmed to afford the one-electron reduced species of H4DPP2+-C, which is further reduced to form a putative isophlorin intermediate as a two-electron reduced species to reduce O2 for H2O2 formation. Thus, H4DPP2+-C/TiO2 performs water oxidation at the TiO2 surface to gain electrons and two-electron reduction of O2 at the H4DPP2+-C moiety, respectively.
The authors' abstract, as published at the source. ACS Catalysis, 2026 · DOI ↗
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Field: Renewable Energy, Sustainability and the Environment
Renewable Energy, Sustainability and the EnvironmentEnergy