电化学英文文献总结解析

❖Application of different synthesis temperatures and Ni–Al LDHs with various Ni concentrations influenced the electrocatalytic performance of the composites for the methanol oxidation reaction as it affected the dispersion of Ni nanoparticles and electrode/electrolyte interfacial active area. The hybrid material prepared at the lowest temperature (600 ◦C) and derived from LDHs with a lower Ni/Al = 2 appeared to have the best electrochemical properties among the studied composites.
❖ Graphene oxide was reduced by hydrazine in ammonia medium to form threedimensional reduced graphene oxide nanocup using polystyrene colloidal particle as sacrificial template.The nanocup was then activated by the alkali corrosion and thermal annealing. The 3D-ARGON/NiAlLDH was finally fabricated by the hydrothermal synthesis via in situ growth of ultrathin NiAl-LDH nanoflakes on the 3D-ARGON in an ethanol medium.
❖ [3]Jie Bao,Yanjuan Zhu.Structure and electrochemical properties of nanometer Cu substituted a-nickel hydroxide. Materials Research Bulletin 48 (2013) 422–428.
❖ We study the influence of application of Ni–Al LDHs with various Ni contributions and different synthesis temperatures on the composition, morphology, specific surface area and Ni dispersion in Ni/C hybrid materials.
❖ Layered double hydroxides (LDHs) described by the general formula[(M2+)1−x(M3+)x(OH−)2]x+(An−)x/n·mH2O, in which M2+ and M3+ represent divalent and trivalent cations being incorporated in layers and An− interlayer anion, have been used for the preparation of various electrode materials, e.g. electrocatalysts.
❖ The present work provides a convenient single-step procedure for the preparation of the electrode materials showing the electrocatalytic activity and makes an important contribution to the formation of N-doped carbon nanotubes with the use of as-prepared Ni-based LDHs.
❖ The paper reported a three-dimensional activated reduced graphene oxide nanocup/nickel aluminum layered double hydroxides composite (3D-ARGON/NiAl-LDH) with super high electrochemical and capacitance performances.
1、Preparation and characterization of the electroactive composites containing nickel nanoparticles and carbon nanotubes
❖The composites containing Ni nanoparticles and N-doped carbon nanotubes were prepared using Ni–Al layered double hydroxides (LDHs) with various Ni/Al atomic ratios (2 and 3) and acetonitrile via catalytic chemical vapor deposition at 600, 700 and 800 ◦C.
❖ We demonstrate that LDHs containing transition metal (nickel) are efficient nanometric metal particle precursors as they prevent metallic species from sintering,which is advantageous for CNTs growth and for the electrochemical/electrocatalytic behavior of the composites.
❖ [1]Aleksandra Pacuła ,Preparation and characterization of the electroactive composites containing nickel nanoparticles and carbon nanotubes[J],Electrochimica Acta,2013(90):563-572.
❖ The study demonstrated that the composite offers special 3D architecture with a macropore on the rim of a cup and large mesoporous structure on the wall of a cup,which will greatly boost the electron transfer and mass transport during the faradaic redox reaction, and displays excellent electrochemical and capactance performances, including high specific capacitance and rate capability, good charge/discharge stability and long-term cycling life.
❖ [2]Yan Lin,Li Ruiyi.Three-dimensional activated reduced graphene oxide nanocup/nickel aluminum layered double hydroxides composite with super high electrochemical and capacitance performances.Electrochimica Acta 95 (2013) 146– 154.
❖ Its maximum specific capacitance was found to be 2712.7 F g−1 at the current density of 1 A g−1, which is more than 7-fold that of pure NiAl-LDH, 3-fold that of common reduced graphene oxide/NiAl-LDH and 1.8-fold that of twodimensional activated reduced graphene oxide/NiAl-LDH. The specific capacitance can remain 1174 F g−1 when the
2、Three-dimensional activated reduced graphene oxide nanocup/nickel aluminum layered double hydroxides composite with super high electrochemical and capacitance performances
LDHs have attracted much interest.
❖ Due to the presence of a lone pair of electrons, nitrogen has a tendency to form complexes with transition metals. So, the presence of nitrogen atom in a transition-metal based catalytic center may influence its electrocatalytic properties.
❖ A variety of LDHs can be easily obtained by changing the proportion and concentration of divalent and trivalent cations allowing LDHs to act as convenient metal precursors for obtaining carbon nanostructures, composites and catalysts . Among them, Ni containing
❖Powder X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, thermogravimetric analysis and nitrogen sorption were employed to characterize their physicochemical properties. The electrochemical properties of the composites were evaluated by meay in alkaline medium with the addition of methanol as a probe molecule.