Abstract
The preparation of nickel powders by the ultrasonic spray pyrolysis of Ni(HCOO)2 was studied. Phase‐pure nickel powder was obtained at as low as 350°C. HCOOH was a reducing source for nickel formation. Moreover, metallic nickel was obtained at a residence time as short as 0.1 s at 600°C. A broad range of particle morphologies, which included agglomerated nanoparticles, nonagglomerated submicrometer particles, hollow particles, and spherical dense particles, were obtained from Ni(HCOO)2 pyrolysis and were shown to depend on the precursor solution and the operating condition.
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