Glycine-assisted hydrothermal synthesis of nanostructured Co x Ni1−x –Al layered triple hydroxides as electrode materials for high-performance supercapacitors

Abstract

Nanostructured Co x Ni 1−x -Al layered triple hydroxides (Co x Ni 1−x -Al LTHs) have been successfully synthesized by a facile hydrothermal method using glycine as chelating agent. The samples were characterized by Xray diffraction, thermogravimetry, Fourier transform infrared spectroscopy and scanning electron microscopy. The morphologies of Co x Ni 1−x -Al LTHs varied with the Co content and its effect on the electrochemical behavior was studied by cyclic voltammetry and galvanostatic chargedischarge techniques. Electrochemical data demonstrated that the Co x Ni 1−x -Al LTHs with Co/Ni molar ratio of 3:2 owned the best performance and delivered a maximum specific capacitance of 1,375 Fg −1 at a current density of 0.5 A g −1 and a good high-rate capability. The capacitance retained 93.3% of the initial value after 1,000 continuous charge-discharge cycles at a current density of 2 A g −1 .

HIGHLY CATALYTICAg/Co3O4NANOCATALYSTS FABRICATED FORRhBDYE DEGRADATION THROUGH A SIMPLE SILVER-MIRROR REACTION UNDER VISIBLE LIGHT

“…The isotherms can be categorized as type IV according to IUPAC classi¯-cations. 31 Furthermore, the hysteresis of Ag/Co 3 O 4 in the region of 0.8 to 1.0 (P/P 0 ) demonstrated the existence of macropores in the interparticle space of the samples. From the adsorption-desorption isotherms, the calculated BET data of Co 3 O 4 and Ag/ Co 3 O 4 were 25 m 2 Á g À1 and 44 m 2 Á g À1 , respectively.…”

Cube‐like α‐Fe2O3 Supported on Ordered Multimodal Porous Carbon as High Performance Electrode Material for Supercapacitors

“…Glycine, a small amino acid, plays the role of a strong chelating agent that coordinates to iron metal ions through either or both the amino and the carboxylate groups. [21,24] Therefore, glycine effectively forms a stable complex with the iron cations, depending on its ionic forms, Gly + , Gly AE , or Gly À . During the hydrothermal treatment, the stability of the iron-glycine complex at room temperature starts decreasing as the temperature increases.…”

Synthesis of Co3O4/NiO nanofilms and their enhanced electrochemical performance for supercapacitor application

“…The closed geometric curve area of Co3O4/NiO electrode is much larger than that of -Co(OH)2/-Ni(OH)2 electrode, indicating a superior capacitance performance of sample after precursor undergoing calcination. In addition, the better symmetric shape of C-V curves for Co3O4/NiO electrode is observed, as well as a smaller potential difference (E) between oxidation peak and reduction peak (0.20 V vs 0.24 V), suggesting Co3O4/NiO electrode has a better redox reversibility than that of -Co(OH)2/-Ni(OH)2 electrode[34,46,64].…”