首页|Spatial construction of ultrasmall Pt-decorated 3D spinel oxide-modified N-doped graphene nanoarchitectures as high-efficiency methanol oxidation electrocatalysts
Spatial construction of ultrasmall Pt-decorated 3D spinel oxide-modified N-doped graphene nanoarchitectures as high-efficiency methanol oxidation electrocatalysts
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Direct methanol fuel cell technology recently becomes the focus of both academic and engineering cir-cles,which stimulates the exploitation and utilization of advanced electrode catalysts with high activity and long lifespan.Herein,we demonstrate a robust bottom-up approach to the spatial construction of three-dimensional(3D)spinel manganese-cobalt oxide-modified N-doped graphene nanoarchitectures decorated with ultrasmall Pt nanoparticles(Pt/MnCo2O4-NG)via a controllable self-assembly process.The incorporation of MnCo2O4 nanocrystals provides abundant hydroxyl sources to pro-mote the oxidative removal of CO-like byproducts on Pt sites,while the existence of 3D porous N-doped graphene networks facilitates the transportation of both ions and electrons in the hybrid system,thus giving rise to remarkable synergetic coupling effects during the methanol oxidation process.Consequently,the optimized Pt/MnCo2O4-NG nanoarchitecture expresses exceptional electrocatalytic properties with a large electrochemically active surface area of 99.5 m2·g-1,a high mass activity of 1508.3 mA·mg-1,strong toxicity resistance and reliable long-term durability,which have obvious competitive advantages over those of conventional Pt/carbon black,Pt/carbon nanotube,Pt/graphene,and Pt/N-doped graphene catalysts with the same Pt usage.
College of Mechanics and Materials,Hohai University,Nanjing 210098,China
New Energy Technology Engineering Lab of Jiangsu Province,College of Science,Nanjing University of Posts &Telecommunications(NUPT),Nanjing 210023,China
International Center for Materials Nanoarchitectonics(WPI-MANA),National Institute for Materials Science,Tsukuba 305-0044,Ibaraki,Japan
National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central Universities
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