N-doped carbon encapsulated nickel nanoparticles: rational fabrication and ultra-high performance for ethanol oxidation

摘要: Abstract N-doped carbon encapsulated nickel nanoparticles (NiNC) are prepared from mixtures of salt, glucose and urea by a simple heating protocol. A higher viscosity the mixture inhibits migration Ni species such that highly dispersed very small form during heat treatment. The sizes can be controlled adjusting composition raw mixtures. optimized sample NiNC-4 contains 2.02 nm in size which afford large metal surface area 400.7 m 2  g −1 high nitrogen content 7.21 at%. An ultra-high current density 327 mA cm −2 is achieved 0.1 M NaOH electrolyte containing 1 M ethanol using NiNC–4 as electrocatalyst. electrodes also exhibit good long-term cycling stability. After 500 cycles, 89% initial sustained 0.5 M ethanol. 96.8% retained moving electrode into fresh solution with after cycles. excellent electrocatalytic properties for oxidation stem synergistic effect porous substrate, abundant N-containing groups nanoparticle size.