Enhanced visible light photocatalytic activity in N-doped edge- and corner-truncated octahedral Cu2O |
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| Affiliation: | 1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China;2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India;1. Department of Physics, Pontifícia Universidade Católica do Rio de Janeiro, Rua Marques de São Vicente, 22451-900 Rio de Janeiro, Brazil;2. INL – International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal;3. Department of Chemistry, Pontifícia Universidade Católica do Rio de Janeiro, Rua Marques de São Vicente, 22451-900 Rio de Janeiro, Brazil;4. Department of Informatics, Università di Verona, Strada le Grazie 15, I-37134 Verona, Italy;5. CBPF – Brazilian Center for Research in Physics, R. Dr. Xavier Sigaud, 150 – Urca, Rio de Janeiro, RJ 22290-180, Brazil;6. PostGraduate Program on Translacional Biomedicine, University of Grande Rio (UNIGRANRIO), Rio de Janeiro, Duque de Caxias, RJ 25071-202, Brazil;7. Division of Metrology of Materials, National Institute of Metrology, Standardization and Industrial Quality (INMETRO), Duque de Caxias, RJ 25250-020, Brazil;1. Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, and Department of Chemistry, Liaocheng University, Liaocheng 252059, PR China;2. Hefei National Laboratory for Physical Science at Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China;1. School of Chemistry and Materials Engineering, Huizhou University, Huizhou, 516007, China;2. Center of Comprehensive Technology, Huizhou Customs, Huizhou, 516006, China;1. Particles and Catalysis Research Group, School of Chemical Engineering, The University of New South Wales, Sydney, NSW, 2052, Australia;2. School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW, 2052, Australia;3. Mark Wainwright Analytical Centre, The University of New South Wales, Sydney, NSW, 2052, Australia;4. School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong Special Administrative Region |
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| Abstract: | Edge- and corner-truncated octahedral Cu2O is successfully synthesized using an aqueous mixture of CuCl2, sodium dodecyl sulfate, NaOH, and NH2OH3·HCl. Cu2O1-xNx(150 °C, 30 min) samples are synthesized by nitridation of Cu2O using an ammonothermal process. Cu retains a formal valence state through and beyond the nitridation process. N concentration in this sample is 1.73 at%, out of which 1.08 at% is substitutional in nature. Photocatalytic activity of Cu2O1-xNx(150 °C, 30 min) sample is investigated and compared to that of pristine edge- and corner-truncated octahedral Cu2O. Results show that Cu2O1-xNx(150 °C, 30 min) sample with dominant {110} facets has a higher photocatalytic activity than the pristine Cu2O material. Higher surface energy and a greater density of the “Cu” dangling bonds on {110} facets of edge- and corner-truncated octahedral Cu2O1-xNx is the plausible reason for the observed optimum catalytic activity. Furthermore defect states induced by nitridation results in improved visible light adsorption. And also the band edge states changes which brought about by N doping. This is an interesting result since it bypasses the usual challenge faced by pristine Cu2O which have band edge states between which transitions are normally forbidden. Selective radical quenching experiments suggest that photocatalytic activity of Cu2O1-xNx is due to formation of hydroxyl radicals in water, subsequent to photogeneration of charge carriers in the photocatalyst. |
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| Keywords: | Ammonothermal processing N doping Visible light photoactivity |
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