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Copper oxide and hematite (CuO/α-Fe2O3) composite catalysts were prepared by using goethite as precursor adopted impregnation way and applied to the dielectric barrier discharge (DBD) catalytic decomposition of gaseous chlorobenzene. The CuO/α-Fe2O3 composite was characterised by X-ray diffraction, Brunauer–Emmett–Teller method, scanning electron microscopy and X-ray photoelectron spectrometer technique. The decomposition efficiency and energy yield of gaseous chlorobenzene in DBD catalysis system were studied by a function of gas flow rate, initial concentration and input voltage. The results showed that the CuO/α-Fe2O3 composite catalyst exhibited remarkable performance on chlorobenzene decomposition when the molar ratio was 0.4 and calcination temperature was 450°C. When the chlorobenzene initial concentration was 230 mg m−3, the chlorobenzene decomposition efficiency and mineralisation rate on the DBD catalysis system reached 73.33% and 63.37%, respectively, its decomposition and mineralisation efficiency were enhanced about 20.5% and 16.61%, respectively, compared with the bare DBD system, and it also benefited to significantly reduce the ozone and NO2 by-products. The possible pathway of chlorobenzene decomposition in the DBD catalytic hybrid system was proposed based on the products analysis. [ABSTRACT FROM AUTHOR]

Nickel oxide and pyrite (NiO/Pyr) composites were prepared by impregnation method and employed in the dielectric barrier discharge (DBD) catalytic removal of gaseous styrene. The properties of the NiO/Pyr composites were characterized systematically. The removal efficiencies of styrene and energy yields had been examined as a function of initial concentration of styrene, gas flow rates and input powers. The results showed that the NiO/Pyr composite had excellent catalytic performance in DBD removal of gaseous styrene while mass ratio of NiO and Pyr was 0.2 and calcined temperature was 500 °C. When the initial concentration of styrene was 240 mg m−3, DBD combined with the NiO/Pyr composite could improve the removal and mineralization efficiency from 89.9% to 69%–98.6% and 78.5%, respectively, as compared with bare DBD system. The possible removal pathways were proposed based on the product identification by FTIR and GC-MS. Image 1 • Nickel oxide and pyrite (NiO/Pyr) composites were prepared by impregnation method. • Dielectric barrier discharge combined with NiO/Pyr had excellent synergistic effect. • DBD-NiO/Pyr had excellent catalytic performance on styrene degradation. [ABSTRACT FROM AUTHOR]

Clarifying the formation mechanism of single-atom sites guides the design of emerging single-atom catalysts (SACs) and facilitates the identification of the active sites at atomic scale. Herein, a molten-salt atomization strategy is developed for synthesizing zinc (Zn) SACs with temperature universality from 400 to 1000/1100 °C and an evolved coordination from Zn-N 2 Cl 2 to Zn-N 4 . The electrochemical tests and in situ attenuated total reflectance-surface-enhanced infrared absorption spectroscopy confirm that the Zn-N 4 atomic sites are active for electrochemical carbon dioxide (CO 2 ) conversion to carbon monoxide (CO). In a strongly acidic medium (0.2 m K 2 SO 4 , pH = 1), the Zn SAC formed at 1000 °C (Zn 1 NC) containing Zn-N 4 sites enables highly selective CO 2 electroreduction to CO, with nearly 100% selectivity toward CO product in a wide current density range of 100-600 mA cm -2 . During a 50 h continuous electrolysis at the industrial current density of 200 mA cm -2 , Zn 1 NC achieves Faradaic efficiencies greater than 95% for CO product. The work presents a temperature-universal formation of single-atom sites, which provides a novel platform for unraveling the active sites in Zn SACs for CO 2 electroreduction and extends the synthesis of SACs with controllable coordination sites., (© 2024 Wiley‐VCH GmbH.)

Emerging artificial photosynthesis promises to offer a competitive means for solar energy conversion and further solves the energy crisis facing the world. Hydrogen peroxide (H 2 O 2 ), which is considered as a benign oxidant and a prospective liquid fuel, has received worldwide attention in the field of artificial photosynthesis on account of the source materials are just oxygen, water, and sunlight. Graphitic carbon nitride (g-C 3 N 4 )-based photocatalysts for H 2 O 2 generation have attracted extensive research interest due to the intrinsic properties of g-C 3 N 4 . In this review, research processes for H 2 O 2 generation on the basis of g-C 3 N 4 , including development, fabrication, merits, and disadvantages, and the state-of-the-art methods to enhance the performance are summarized after a brief introduction and the mechanism analysis of an efficient catalytic system. Also, recent applications of g-C 3 N 4 -based photocatalysts for H 2 O 2 production are reviewed, and the significance of active sites and synthetic pathways are highlighted from the view of reducing barriers. Finally, this paper ends with some concluding remarks to reveal the issues and opportunities of g-C 3 N 4 -based photocatalysts for producing H 2 O 2 in a high yield., (© 2023 Wiley-VCH GmbH.)

Copper oxide and hematite (CuO/ α -Fe 2 O 3 ) composite catalysts were prepared by using goethite as precursor adopted impregnation way and applied to the dielectric barrier discharge (DBD) catalytic decomposition of gaseous chlorobenzene. The CuO/ α -Fe 2 O 3 composite was characterised by X-ray diffraction, Brunauer-Emmett-Teller method, scanning electron microscopy and X-ray photoelectron spectrometer technique. The decomposition efficiency and energy yield of gaseous chlorobenzene in DBD catalysis system were studied by a function of gas flow rate, initial concentration and input voltage. The results showed that the CuO/ α -Fe 2 O 3 composite catalyst exhibited remarkable performance on chlorobenzene decomposition when the molar ratio was 0.4 and calcination temperature was 450°C. When the chlorobenzene initial concentration was 230 mg m -3 , the chlorobenzene decomposition efficiency and mineralisation rate on the DBD catalysis system reached 73.33% and 63.37%, respectively, its decomposition and mineralisation efficiency were enhanced about 20.5% and 16.61%, respectively, compared with the bare DBD system, and it also benefited to significantly reduce the ozone and NO 2 by-products. The possible pathway of chlorobenzene decomposition in the DBD catalytic hybrid system was proposed based on the products analysis.