Bimetallic Ni-Co nanoparticles as an efficient catalyst of hydrogen generation via hydrolysis of NaBH4

• DOI: 10.1016/j.jallcom.2022.164484
• Publication Date: 2022-03-09T16:31:14Z
• Authors: A. Kytsya; V. Berezovets; Yu. Verbovytskyy; L. Bazylyak; V. Kordan; I. Zavaliy; V.A. Yartys
• Keywords: Bimetallic strip; Reaction rate; Dispersity

Ni-Co bimetallic nanoparticles (NPs) have been synthesized via reduction of Ni and Co hydroxides by hydrazine in water / ethylene glycol solutions. It was found that the particle size polydispersity obtained chemically homogeneous NPs decrease with a decreasing to 50 at.% content reaction mixture. A different trend observed for Ni25Co75 related formation Ni- Co-rich particles. Ni-Co-NPs were tested as catalysts hydrolysis alkaline solutions NaBH4, highest rate hydrogen generation Ni50Co50. Zero-order kinetics evolution process all studied systems. Based on data kinetic studies, we conclude (a) increased increasing NaBH4 concentration range 0.1 – 1 mol/L; (b) decreased 25% pH solution from 9 14. Studies temperature dependence rates showed activation energy 26 kJ/mol contents catalysts. comparison values enthalpy viscous flow initial after hydrolysis, diffusion-controlled mechanism proposed.