The absence of ring current in the return trace indicates that both these reactions are passivating however, as also observed over multiple cycles (SI-6). We therefore turn our attention to the ring current during the electroplating in Figure , where galvanostatic growth of ~1 µm of lithium on the disk at -1 mA/cm 2 on the disk is followed by relaxation at 0 mA/cm 2 , while keeping the ring at 3.5 V. This protocol also resulted in a blue color of the electrode, similar to the stationary case, as shown in the right inset. In contrast to the vanishing ring current during CV however, hydrogen is continuously detected during growth, and rapidly decays (over a period of ~30 s) when the process is stopped. A large peak in the ring current is seen at the time of nucleation, as depicted in the left inset which decreases towards a steady state current (where an Iring of 1 µA corresponds to 0.05 partial current).