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Apport de la pression sur les performances d'une cellule d'électrolyse de la vapeur d'eau à haute température

Abstract : In order to improve the industrial attractiveness of high temperature steam electrolysis (HTSE), the increase in the operating pressure is one of the most promising solutions. In this context, this study is dedicated to the analysis of the pressure influence on the electrochemical reactions occurring in HTSE. A Model and experimental results dealing with the effect of pressure increase have been carried out. Concerning the cathodic side model, the limiting current density due to the lack of steam is shifted towards higher steam conversion rates by increasing the operating pressure. Regarding the anodic side, a negative thermodynamic effect is predicted by Nernst equation but no negative effect appears at high current density. Furthermore, the overpressure at the oxygen electrode decreases with the operating pressure (and so the risk of delamination is reduced). At the same time, experimental studies on three electrodes cell until 30 bars have been lead on the oxygen electrode. A positive effect of the pressure on the oxygen side performances has been observed. This gain in performance could be explained by three different mechanisms. The mechanic effect of pressure increase contact inside the electrode. Furthermore, high pressure improves gas circulation and adsorption/desorption kinetics at the surface of electrode.
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Quentin Cacciuttolo. Apport de la pression sur les performances d'une cellule d'électrolyse de la vapeur d'eau à haute température. Chimie théorique et/ou physique. Université Pierre et Marie Curie - Paris VI, 2014. Français. ⟨NNT : 2014PA066610⟩. ⟨tel-01146041⟩

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