Covalent organic frameworks (COFs) exhibit considerable potential as photocatalysts for H2O2 production through the oxygen reduction reaction (ORR) in water. However, their catalytic efficiency is often hindered by sluggish charge separation and a scarcity of sites for O2 activation. Here, a heterojunction of Ho-loaded ZIF-L/triazine-based COF (Ho-ZIF-L/TTA-COF) is designed and synthesized through the electrostatically induced π-π assembly for efficient photocatalytic H2O2 production. The optimized Ho-ZIF-L/TTA-COF heterojunction achieves an impressive H2O2 production rate of 7.19 mmol g-1 h-1 without any sacrificial agents under visible-light irradiation, representing a 7.6-fold enhancement compared to individual TTA-COF. Based on the results of in situ X-ray photoelectron spectroscopy and Kelvin probe force microscopy, the enhanced performance is mainly ascribed to the favorable electrons transfer from TTA-COF to ZIF-L then to the loaded Ho species for greatly enhancing charge separation. Noteworthily, Ho-ZIF-L possesses fully exposed Ho active sites and a large specific surface area, accounting for the efficient 2e- ORR dominated by the produced •O2 - radicals for H2O2 formation.
Covalent organic frameworks (COFs) have attracted considerable attention as promising photocatalysts for hydrogen peroxide (H2O2) production. To further improve their catalytic performance, a quaternary ammonium functionality was introduced into the bipyridine units of the COF via a post-synthetic modification strate...
Zhi-Hui Sun, Jia-Jia Li, Long-Yang Yang et al.· ACS Applied Energy Materials· 0 citations
Efficient removal of phenolic compounds from industrial wastewater remains a significant challenge in water treatment. While persulfate-based advanced oxidation processes have garnered attention due to their strong oxidation capability, their application is constrained by activation efficiency. In this work, a visible-...
The photocatalytic production of hydrogen peroxide (H2O2) using renewable solar energy provides a more sustainable option compared to the energy-intensive anthraquinone process. The present study designed a Z-scheme heterojunction photocatalyst, Bi/BiVO4/MgIn2S4 (BOBVM), with rich oxygen vacancies. Utilizing Bi-MOF as...
Lu Zhang, Jian-Hao Qiu, Dan Zhang et al.· Inorganic Chemistry· 0 citations
The photoelectrochemical (PEC) reduction of carbon dioxide to value-added chemicals presents a promising strategy for mitigating the energy crisis and environmental issues. Herein, we report a facile approach for constructing an inorganic/organic semiconductor heterojunction between g-C3N4 and ZrN, which is endowed w...
Noushad Ullah, Chen-Pu He, Yan Wei et al.· Artificial Photosynthesis· 0 citations
Efficient photocatalytic H2 evolution requires coordinated control of light absorption, interfacial charge transfer, and surface reduction kinetics. Here, g-C3N4/Bi4Ti3O12 (CN/BTO) heterojunctions were constructed by in-situ thermal coupling and subsequently modified through in-situ photodeposition of Pt. Among the inv...
Photocatalytic H2O2 production from the oxygen reduction reaction (ORR) has emerged as a sustainable and green approach to address the global energy crisis and environmental challenges. However, its practical application is still limited by sluggish reaction kinetics and fast recombination of photogenerated excitons....
Jayashree Panda, Jyotirmayee Sahu, Nagma Sultana et al.· ACS Applied Energy Materials· 0 citations
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