Chlorine doped graphitic carbon nitride nanorings as an efficient photoresponsive catalyst for water oxidation and organic decomposition |
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| Affiliation: | 1. Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices, School of Physics and Electronics, Hunan University, Changsha 410082, China;2. School of Materials Science and Engineering, Hunan University, Changsha 410082, China;1. Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang, 110819, China;2. School of Metallurgy, Northeastern University, Shenyang, 110819, China;1. College of Chemistry and Molecular Engineering, Qingdao University of Science & Technology, Qingdao 266042, China;2. School of Materials Science and Engineering, Qingdao University of Science & Technology, Qingdao 266042, China;1. Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, PR China;2. College of Environmental and Biological Engineering, Chongqing Technology and Business University, Chongqing 400067, China;3. New Technologies—Research Centre, University of West Bohemia, Univerzitni 8, 306 14 Pilsen, Czech Republic and School of Material Engineering, University Malaysia Perlis, Kangar, Perlis, 01007, Malaysia;4. Key Laboratory of Ecological Security for Water Source Region of Mid-line Project of South-to-North Water Diversion of Henan Province, College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China;5. Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany;6. Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;1. School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China;2. School of Pharmacy, Jiangsu University, Zhenjiang 212013, PR China;3. Center of Analysis and Test, Jiangsu University, Zhenjiang 212013, PR China;1. Department of Chemistry and Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel;2. Department of Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Research Campus Golm, Potsdam 14424, Germany |
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| Abstract: | Rationally engineering the microstructure and electronic structure of catalysts to induce high activity for versatile applications remains a challenge. Herein, chlorine doped graphitic carbon nitride (Cl-doped g-C3N4) nanorings have been designed as a superior photocatalyst for pollutant degradation and oxygen evolution reaction (OER). Remarkably, Cl-doped g-C3N4 nanorings display enhanced OER performance with a small overpotential of approximately 290 mV at current density of 10 mA cm−2 and Tafel slope of 83 mV dec-1, possessing comparable OER activity to precious metal oxides RuO2 and IrO2/C. The excellent catalytic performance of Cl-doped g-C3N4 nanorings originates from the strong oxidation capability, abundant active sites exposed and efficient charge transfer. More importantly, visible light irradiation gives rise to a prominent improvement of the OER performance, reducing the OER overpotential and Tafel slope by 140 mV and 28 mV dec-1, respectively, demonstrating the striking photo-responsive OER activity of Cl-doped g-C3N4 nanorings. The great photo-induced improvement in OER activity would be related to the efficient charge transfer and the  OH radicals arising spontaneously on CN-Cl100 catalyst upon light irradiation. This work establishes Cl-doped g-C3N4 nanorings as a highly competitive metal-free candidate for photoelectrochemical energy conversion and environmental cleaning application. |
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| Keywords: | Nanoring Electrocatalysts Oxygen evolution reaction Pollutant degradation |
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