Three‐Dimensional Nitrogen‐Doped Reduced Graphene Oxide–Carbon Nanotubes Architecture Supporting Ultrafine Palladium Nanoparticles for Highly Efficient Methanol Electrooxidation |
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Authors: | Hejie Song Liming Yang Prof. Yanhong Tang Dafeng Yan Prof. Chengbin Liu Prof. Shenglian Luo |
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Affiliation: | 1. State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan Provincial Key Laboratory for Cost‐Effective Utilization of Fossil Fuel Aimed at Reducing Carbon Dioxide Emissions, Hunan University, Changsha 410082 (P. R. China);2. College of Materials Science and Engineering, Hunan University, Changsha 410082 (P. R. China) |
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Abstract: | A three‐dimensional (3D) nitrogen‐doped reduced graphene oxide (rGO)–carbon nanotubes (CNTs) architecture supporting ultrafine Pd nanoparticles is prepared and used as a highly efficient electrocatalyst. Graphene oxide (GO) is first used as a surfactant to disperse pristine CNTs for electrochemical preparation of 3D rGO@CNTs, and subsequently one‐step electrodeposition of the stable colloidal GO–CNTs solution containing Na2PdCl4 affords rGO@CNTs‐supported Pd nanoparticles. Further thermal treatment of the Pd/rGO@CNTs hybrid with ammonia achieves not only in situ nitrogen‐doping of the rGO@CNTs support but also extraordinary size decrease of the Pd nanoparticles to below 2.0 nm. The resulting catalyst is characterized by scanning and transmission electron microscopy, X‐ray diffraction, Raman spectroscopy, and X‐ray photoelectron spectroscopy. Catalyst performance for the methanol oxidation reaction is tested through cyclic voltammetry and chronoamperometry techniques, which shows exceedingly high mass activity and superior durability. |
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Keywords: | carbon nanotubes electrocatalysis electrodeposition palladium reduced graphene oxide |
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