Citation: Seyed Karim Hassaninejad-Darzi. Encapsulation of a nickel Salen complex in nanozeolite LTA as a carbon paste electrode modifier for electrocatalytic oxidation of hydrazine[J]. Chinese Journal of Catalysis, ;2018, 39(2): 283-296. doi: 10.1016/S1872-2067(18)63025-6 shu

Encapsulation of a nickel Salen complex in nanozeolite LTA as a carbon paste electrode modifier for electrocatalytic oxidation of hydrazine

Seyed Karim Hassaninejad-Darzi

Department of Chemistry, Faculty of Basic Science, Babol Noshirvani University of Technology, Shariati Ave., Babol 47148-71167, Iran

Received Date: 26 September 2017
Revised Date: 14 January 2018

A nickel salen complex was encapsulated in the supercages of nanozeolite NaA, LTA (linde type A) structure, using the flexible ligand method. The electrochemical behavior and electrocatalytic activity of a carbon paste electrode (CPE) modified with Ni(Ⅱ)-Salen-A (Ni(Ⅱ)-SalenA/CPE) for hydrazine oxidation in 0.1 mol/L NaOH solution were investigated by cyclic voltammetry, chronoamperometry, and chronocoulometry. First, organic-template-free synthesis of nanozeolite LTA was performed and the obtained material was characterized by various techniques. The average particle size of the LTA crystals was estimated to be 56.1 and 72 nm by X-ray diffraction and particle size analysis, respectively. The electron transfer coefficient was found to be 0.64 and the catalytic rate constant for oxidation of hydrazine at the redox sites of Ni(Ⅱ)-SalenA/CPE was found to be 1.03×10⁵ cm³/(mol·s). Investigation of the electrocatalytic mechanism suggested that oxidation of hydrazine occurred through reaction with Ni³⁺(Salen)O(OH) and also direct electrooxidation. The anodic peak currents revealed a linear dependence on the square root of the scan rate, indicating a diffusion-controlled process, and the diffusion coefficient of hydrazine was found to be 1.18×10^-7 cm²/s. The results indicated that Ni(Ⅱ)-SalenA/CPE displays good electrocatalytic activity toward hydrazine oxidation owing to the porous structure of nanozeolite LTA and the Ni(Ⅱ)-Salen complex. Finally, the general reaction mechanism for the electrooxidation of hydrazine on Ni(Ⅱ)-SalenA/CPE in alkaline solution involves the transfer of four electrons, in which the first electron transfer reaction acts as the rate-limiting step followed by a three-electron process to generate environmentally friendly nitrogen and water as final products.
- Nanozeolite linde type A,
- Salen complex,
- Ni(II)-SalenA modified carbon paste electron,
- Hydrazine,
- Electrocatalytic oxidation,
- Fuel cell
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