The result of specific energy consumption is revealed in Fig. 3d.
The value of ECTOC is not shown at 1.5 V as no chlorine is produced
and TOC is totally removed by adsorption rather than electrochemical
oxidation. Besides, ECTOC is roughly similar at 2.0 V or 3.0 V.
However, the value of ECNaCl notably increases with the increasing
potential. Since more parasitic reactions will occur at higher
applied potential, the energy consumption increases. Not that
ECNaCl is much lower than ECTOC.