Abstract
The electrochemical reactions on a Zn anode and a Pt cathode in water at 25°C and the growth of ZnO particles are investigated by x‐ray diffraction, scanning electron microscopy, and high‐resolution transmission electron microscopy. The solution pH, current, and weight of the anode were measured as a function of the voltage applied between the anode and cathode from 10 to 400 V. At voltages below 100 V the dissolution of Zn occurs on the anode, and above 100 V the formation of ZnO also takes place. The applied current generates 
at the cathode. Initially, when the pH is lower, ZnO nano‐sized particles are deposited on the cathode. When the pH of the water increases, 
combines with 
to form spindle‐like ZnO particles as long as 1 μm.