کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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6471852 | 1424125 | 2017 | 7 صفحه PDF | دانلود رایگان |
N-doped carbon encapsulated nickel nanoparticles (NiNC) are prepared from mixtures of nickel salt, glucose and urea by a simple heating protocol. A higher viscosity of the mixture inhibits the migration of Ni species such that highly dispersed and very small Ni nanoparticles form during heat treatment. The sizes of the Ni nanoparticles can be controlled by adjusting the composition of the raw mixtures. The optimized sample of NiNC-4 contains Ni nanoparticles of 2.02Â nm in size which afford a large metal surface area of 400.7Â m2Â gâ1 and a high nitrogen content of 7.21 at%. An ultra-high current density of 327Â mAÂ cmâ2 is achieved in 0.1Â M NaOH electrolyte containing 1Â M ethanol using NiNC-4 as the electrocatalyst. NiNC-4 electrodes also exhibit a good long-term cycling stability. After 500 cycles, 89% of the initial current density is sustained in 0.1Â M NaOH electrolyte containing 0.5Â M ethanol. 96.8% of the initial current density is retained by moving the NiNC-4 electrode into fresh 0.1Â M NaOH solution with 0.5Â M ethanol after 500 cycles. The excellent electrocatalytic properties of NiNC-4 for ethanol oxidation stem from the synergistic effect of the porous carbon substrate, abundant N-containing groups and the small nickel nanoparticle size.
Schematic illustration of the fabrication process of NiNC for ethanol oxidation in alkaline solution.123
Journal: Electrochimica Acta - Volume 232, 1 April 2017, Pages 332-338