Figure 1

Morphology of the cathode after uninterrupted EM for 650 h (a) Overall morphology (b) Upside region of the cathode (c) Downside region of the cathode.

Morphology of the cathode after uninterrupted EM for 650 h (a) Overall morphology (b) Upside region of the cathode (c) Downside region of the cathode.