A system regulating pressure of a reactor for hightemperature electrolysis or co-electrolysis (HTE) or to an SOFC fuel-cell stack operating under pressure. The operation of the system includes: regulating upstream of one of the chambers, a flow rate of moisture-containing gas DH to guarantee electrochemical stability of a preset operating point; and controlling pressure by virtue of valves arranged downstream of the stack, for regulating gases including the moisture-containing gas, and which are generally hot.

The invention essentially consists in supplying fuel (either swam or a mixture of steam with CO2 or H2 or CH4) to distinct zones of a cell or a group of stacked cells and of an adjacent cell or group of adjacent stacked cells within a given (co-)electrolysis reactor or a SOFC fuel-cell stack.

A sealing arrangement of solid oxide cell stacks is disclosed. The sealing arrangement includes a gasket structure between a flow field plate and an electrolyte element, and between flow field plates of repetitious structures, with first sealing layers being in contact with the flow field plate and the gasket structure, the first sealing layers being overlaid over a selected area of the flow field plate and over a selected area of the gasket structure according to corrosion minimization criteria and on the basis of sealing function criteria.

A differential pressure water electrolysis system includes high pressure water electrolysis cells stacked and fastened in a stacking direction. Each of the high pressure water electrolysis cells includes an electrolyte membrane, an anode feed conductor, a cathode feed conductor, an anode separator, a cathode separator, an elastic member, a hydrogen manifold, a conductive member, a sealing member, a conductive sheet, and an insulation member. The conductive member is disposed between the cathode separator and the electrolyte membrane to provide the hydrogen manifold. The conductive sheet is disposed so as to extend from a first portion between the conductive member and the electrolyte membrane to a second portion between the cathode feed conductor and the elastic member. The insulation member is disposed in a center portion of the cathode feed conductor and between the conductive sheet and the electrolyte membrane.

A spacer for an electrolyzer cell of substantially annular shape comprises: a peripheral part having two parallel principal faces opposite each other, the distance separating the two principal faces defining a thickness of the spacer, and an internal part having a thickness strictly less than the thickness of the spacer, the peripheral part and the internal part being in one piece and connected to each other forming an internal annular shoulder so that the internal part has a substantially annular intermediate face extending in a plane parallel to the two principal faces of the peripheral part and situated between the two principal faces.

An end pressure plate is provided for an electrochemical cell stack or an electrolyzer module. The end pressure plates comprise a load transfer plate for maintaining even pressure over the faces of the structural plates, and a backing plate for supporting load transferred from the load transfer plate.

There are provided electrochemical methods and systems to form one or more organic compounds or enantiomers thereof selected from the group consisting of substituted or unsubstituted dioxane, substituted or unsubstituted dioxolane, dichloroethylether, dichloromethyl methyl ether, dichloroethyl methyl ether, chloroform, carbon tetrachloride, phosgene, and combinations thereof.

The invention relates to the production or a heat-transfer gas circuit for the heat management/regulation of the stack of an HTE reactor or an SOFC fuel cell by removing certain cells in certain areas of the stack in order to replace them with electrical contact elements that allow the heat transfer gas to pass through.

A bipolar electrolytic cell particularly useful for electrochemical processes carried out with periodic reversal of polarity is provided. The cell is equipped with a series of concentric electrode pairs, the innermost pair and the outermost pair being connected to the poles of a DC generator and the intermediate pairs acting as bipolar electrodes. The different pairs of electrodes are arranged and connected in such a way that, at each stage of the process, the overall cathodic area is equal to the anodic area.

An undivided electrolysis cell for electrolyzing a liquor is disclosed which has a narrow gap between the electrodes and improved energy efficiency. The electrolysis cell comprises a porous anode, a porous cathode, and an electrically insulating separator therebetween which are all permeable to the liquor. Electrolysis is performed while directing the liquor through the porous anode, the electrically insulating separator, and the porous cathode. Gas products generated during electrolysis are carried out with the liquor and do not remain between the electrodes thereby reducing gas blinding. The electrolysis cell is particularly suitable for chlorate electrolysis.