Interfacially bonded Co-N boosts photocatalytic H2 evolution in a closely coupled CoFe2O4/g-C3N4 composite structure |
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| Affiliation: | 1. State Key Laboratory of Technology in Space Cryogenic Propellants, Beijing 100028;2. North China Institute of Science and Technology, Xueyuan Road, Langfang, Hebei, 065201, China;3. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, 100081, Beijing, China;1. Department of Metallurgical and Materials Engineering, IIT Madras, JAML, Chennai, 600036, TN, India;2. Department of Materials Science and Metallurgical Engineering, IIT Hyderabad, Kandi, 502285, TS, India;1. CAS Key Laboratory of Green Process and Engineering Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;2. National Engineering Research Center of Green Recycling for Strategic Metal Resources, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Zhengzhou Institute of Emerging Industrial Technology, Zhengzhou 450003, China;1. Laboratory of Materials and Application to the Environment, Faculty of Chemistry (USTHB), BP 32, 16111, Algiers, Algeria;2. Laboratory of Storage and Valorization of Renewable, Faculty of Chemistry (USTHB), BP 32, 16111, Algiers, Algeria;3. Université François-Rabelais de Tours, GREMAN UMR 7347 CNRS, IUT de Blois 15 Rue de la Chocolaterie, CS 2903, BP41029, Blois Cedex, France;1. Department of Metallurgical and Materials Engineering, Karadeniz Technical University, 61040, Trabzon, Turkey;2. Department of Metallurgical and Materials Engineering, Gaziantep University, 27310, Gaziantep, Turkey;3. Laboratory for Nuclear and Plasma Physics, Vin?a Institute of Nuclear Sciences, University of Belgrade, 11000 Belgrade, Serbia;4. Center of Excellence for Hydrogen and Renewable Energy Convince, Vin?a Institute of Nuclear Sciences, University of Belgrade, POB 522, 11001 Belgrade, Serbia |
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| Abstract: | To create hybrid composites for highly effective photocatalytic hydrogen evolution reactions, the photogenerated charge separation efficiency at the hybrid interface and the surface reaction kinetics at the reactive sites are key factors. In this work, CoFe hydroxide nanosheets prepared by dealloying were first mixed with graphitic carbon nitride (g-C3N4) to synthesize a CoFe2O4/g-C3N4 composite with strong Co-N bonds at the interface by a simple hydrothermal method. It was found that the presence of Co-N bonds between the components in the composites enhances the separation and transfer by photogenerated carriers at the composite interface. Furthermore, the presence of Co-N bonds enhanced the synergistic effect of the hybrid, which significantly boosts their photocatalytic performance in comparison to their counterparts. Under full-spectrum light, the composite photocatalyst has a greater efficiency of photocatalytic water H2 evolution (6.793 mmol/g?1·h?1) and exceptional stability when compared to pure g-C3N4 (0.236 mmol/g?1·h?1) and CoFe2O4 (0.088 mmol/g?1·h?1). Under visible irradiation, the photocatalytic activity of the composite (0.556 mmol/g?1·h?1) for H2 evolution increased by factors of 28.37 and 75.8 when compared to pure g-C3N4 and CoFe2O4, respectively. |
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| Keywords: | Dealloying Co-N bonds Photocatalysts |
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