3.2.1.3. Solid oxide electrolysis cells. Solid oxide electrolysis cells
(SOEC) are essentially solid oxide fuel cells operating in reverse.
These systems replace part of the electrical energy required to split
water with thermal energy, as can be seen in Fig. 8 [174]. The
higher temperatures increase the electrolyzer efficiency by
decreasing the anode and cathode overpotentials which cause
power loss in electrolysis [174,175]. For example, an increase in
temperature from 375 to 1050 K reduces the combined thermal