Synthesis of bimetallic PtPd nanocubes on graphene with N,N-dimethylformamide and their direct use for methanol electrocatalytic oxidation |
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| Affiliation: | 1. College of Biological Engineering, Jimei University, Xiamen 361021, China;2. State Key Laboratory of Marine Environmental Science and Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, Xiamen University, Xiamen 361005, China;3. Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8520, Japan;4. Ministry of Education Key Laboratory of Analysis and Detection Technology for Food Safety, Fuzhou University, Fuzhou 350002, China;1. School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, United States;2. The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA 30332, United States;1. Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China;2. Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China;1. College of Geography and Environmental Science, College of Chemistry and Life Science, Zhejiang Normal University, Jinhua 321004, China;2. Department of Chemistry, Faculty of Science, King Mongkut’s University of Technology, Bangkok 10140, Thailand;1. Physical Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata 700032, India;2. Department of Instrumentation Science, Jadavpur University, Kolkata 700032, India;3. Department of Chemistry, Chandernagore College, Chandannagar, Hooghly, WB-712136, India;1. School of Materials Science and Engineering, Central South University, Changsha 410083, Hunan, China;2. Key Laboratory of Non-ferrous Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, Hunan, China;3. Hunan Key Laboratory of Super Microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha 410083, Hunan, China;1. Universidad Nacional Autónoma de México, Centro de Nanociencias y Nanotecnología, Ensenada, B.C., C. P. 22860, Mexico;2. Instituto Tecnológico de Tijuana, Centro de Graduados e Investigación, Tijuana, B.C., C. P. 22000, Mexico;3. Instituto Tecnológico de Oaxaca, Departamento de Ingeniería Química y Bioquímica, Oaxaca, Oax., C. P. 68030, Mexico;4. Instituto Tecnológico de Cancún, Av Kabah Km. 3, Cancún, Q.R., C. P. 77500, Mexico |
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| Abstract: | Bimetallic PtPd nanocubes supported on graphene nanosheets (PtPdNCs/GNs) were prepared by a rapid, one-pot and surfactant-free method, in which N,N-dimethylformamide (DMF) was used as a bi-functional solvent for the reduction of both metal precursors and graphene oxide (GO) and for the surface confining growth of PtPdNCs. The morphology, structure and composition of the thus-prepared PtPdNCs/GNs were characterized by transmission electron microscopy (TEM), high resolution TEM, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. Because no surfactant or halide ions were involved in the proposed synthesis, the prepared PtPdNCs/GNs were directly modified onto a glassy carbon electrode and showed high electrocatalytic activity for methanol oxidation in cyclic voltammetry without any pretreatments. Moreover, with the synergetic effects of Pt and Pd and the enhanced electron transfer by graphene, the PtPdNCs/GNs composites exhibited higher electrocatalytic activity (jp = 0.48 A mg?1) and better tolerance to carbon monoxide poisoning (If/Ib = 1.27) compared with PtPd nanoparticles supported on carbon black (PtPdNPs/C) (jp = 0.28 A mg?1; If/Ib = 1.01) and PtNPs/GNs (jp = 0.33 A mg?1; If/Ib = 0.95). This approach demonstrates that the use of DMF as a solvent with heating is really useful for reducing GO and metal precursors concurrently for preparing clean metal–graphene composites. |
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