The Real Current Density Distribution on Mg Surface

To quantitatively analyze the real current density distribution and electrochemical activity on a Mg electrode, the electronic current densities distributed on a multi-Mg wire array electrode were compared with scanning vibration electrode technique (SVET) mapped ionic current density distributions. The SVET measured current densities were found to be nearly ten times lower than the electronic ones. The cathodic current densities detected in SVET mapping could be a result of hydrogen bubbles trapped on the electrode surface. The measurement of the real current density distribution on Mg surface helps deepen the understanding of Mg anode dissolution.