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Size and structure tuning of fept nanoparticles on hollow mesoporous carbon spheres as efficient catalysts for oxygen reduction reaction

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Rare Metals 2023年第6期42卷 1865-1876页

作者： Cheng Yang Han-Bin Wang Pei Liang Bin-Feng Wu Lei Zhao Ping-Shu Leng Lin Lv Hou-Zhao Wan Hao Wang School of Microelectronics Hubei UniversityWuhan430062China Hubei Yangtze Memory Laboratories Wuhan430205China College of Optical and Electronic Technology China Jiliang UniversityHangzhou310018China

Finding and designing cathode oxygen reduction reaction(ORR) catalysts with high activity and stability in acidic electrolyte is essential for the large-scale application of fuel cells and metal-air batteries.Pt-based alloys have emerged as potential electrocatalysts for the oxygen reduction reaction.Herein,we adapted a simple pyrolytic reduction method to grow fept nanoalloys on hollow mesoporous carbon supports.Benefiting from the ultra-high specific surface of the hollow mesoporous carbon,the in situ formed fept NPs were homogenously deposited on the carbon supports with size smaller than5 nm.The optimized fept-HMCS showed a remarkably increased mass activity(MA) of 0.582 A·mg^(-1)_(Pt) at 0.75 V in ORR,being 6.3 times higher than that of commercial Pt/C(0.093 A·mg^(-1)_(Pt)).Meanwhile,the fept NPs showed negligible decay in mass activity with 21 mV of negative shift in the half-wave potential after 5000 electrochemical cycles,which is more stable than that of commercial Pt/C(6.6% decay in MA with 30 mV of negative shift).The study demonstrated a simple strategy for controlling the alloy size with enhanced metal-support interactions to boost their promising application in fuel cells.

关键词： Oxygen reduction Electrocatalysts Mesoporous carbon fept alloy

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The Effect of the Size and Electronic Factor on Occupation and Magnetic Property of Co Addition in L10 fept alloy

The Effect of the Size and Electronic Factor on Occupation a...

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中国材料大会2012

作者： Xiaolin Shu Yongfei Jia Ziyu Chen College of Physical Science and Nuclear Engineer Beijing University of Aeronautics and Astronautics

ISBN: (纸本)9783037856093;3037856092

The size and the electronic factor are used to analyze the occupation of doped Co atom in L10 fept alloy as well as its influence on crystal structure and magnetic property. The Co atom located in Fe sublattice site is determined by the variance of the calculated structure and the doping energy results investigated by the first-principles calculations. The charge-density difference contour plot and Bader charge analysis can quantitatively distinguish the effects of the size and the electronic factor on physical properties of the doping alloy. The effect of the electronic factor on the doping energy is more dominant than that of the size factor. The size factor almost has no effect on saturation magnetization.

关键词： fept alloy Co addition Size factor Electronic factor First principles

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