Fig. 6

(a) LSV inverse scan curve of each electrode of BDD, Ni/BDD, and CoFeS/Ni/BDD scanned in 1 M KOH solution or alkaline simulated seawater (1 M/3 M) at a scan rate of 5 mV/s. (b) Current Tafel curve when the density is 100 mA cm^-2. (c) EIS curve relative to Hg/HgO when the potential is 0.6 V.