An improved chemical reduction route for fine nickel powders

作者：Bae CO; Kim YH; Son JH; Hwang SJ; Kwon YU^*; Lee BY; Kim YS

来源：Journal of Industrial and Engineering Chemistry, 2005, 11(6): 902-910.

• chemical synthesis
• nickel ultrafine powder
• hydrazine complex

We report an improved chemical reduction route toward fine nickel powders by using nickel hydrazine complexes [Ni(N2H4)(3)SO4 and Ni(N2H4)(n)Cl-2 (n = 2 and 3)] as the starting materials, rather than Ni(OH)2, which is used in the conventional procedure. The reductions of the hydrazine complexes had reaction rates that were three to ten-fold higher than those of the conventional method. As a result, the products consist of homogeneous, phase-pure, spherical, fine nickel particles that have smooth surfaces; they were formed without the need for additives or extreme reaction conditions. The reaction rates could be related to the solubilities of the precursors, which increase in the order Ni(N2H4)(2)Cl-2 > Ni(N2H4)(3)Cl-2 > Ni(NzH(4))(3)SO4; we propose a reaction mechanism based on this observation.

• 出版日期2005-11