Effect of hydrogen evolution reaction on morphology and crystal structure of electrolytically produced copper powder particles

Abstract

Morphologies of copper powder particles obtained by potentiostatic regime of electrolysis under different hydrogen evolution conditions were correlated with their crystal structure. In the dependence of quantity of evolved hydrogen, the either dendritic or cauliflower-like particles were formed. In the both types of the particles, Cu crystallites were random oriented. This random orientation is ascribed to the existence of the spherical morphology and to similar morphology at the micro level, because the both types of particles were constructed from small agglomerates of approximately spherical Cu grains at the micro level. The particle size distribution (PSD) of the obtained particles is also examined and it was shown the strong effect of the shape and size of particles on it, with a tendency of the decrease of particle size with increasing the overpotential of electrolysis.

Morfologije praškastih čestica bakra dobijene potenciostatskim režimom elektrolize pod različitim uslovima izdvajanja vodonika su korelisane sa njihovom kristalnom strukturom. U zavisnosti od količine izdvojenog vodonika, formirane su ili dendritične ili karfiolaste čestice. U oba tipa čestica, kristaliti bakra su bili slučajno orijentisani. Ova slučajna orijentacija je pripisana postojanju sferične morfologije i sličnoj morfologiji na mikro nivou, zato što oba tipa čestica su bila izgrađena od malih aglomerata približno sferičnih zrna bakra na mikro novou. Raspodela veličine čestica (PSD) dobijenih čestica je takođe ispitana i pokazan je strog uticaj oblika i veličine čestica na raspodelu, sa tendencijom smanjenja veličine čestica sa povećavajućom prenapetošću elektrolize.