Abstract: The invention relates to a process for manufacturing at least one elementary electrochemical cell comprising a first and a second electrode between which an electrolyte is intercalated, said first and second electrodes and said electrolyte being in the form of layers, which process is characterized in that it comprises: a) producing at least one structure comprising a layer of a powder of a first electrode material and a layer of a powder of a second electrode material between which a layer of a powder of an electrolyte material is intercalated; and b) simultaneously sintering all the powder layers by an electric field sintering. Applications: manufacture of energy- or hydrogen-producing electrochemical systems, in particular solid oxide fuel cells (SOFCs) or high temperature electrolysers cells (HTEs).

Abstract: The invention relates to a method for preparing a composite powder comprising a core, comprising an apatite and a coating layer covering all or part of said core, which coating layer comprises particles in a metal element and/or in an oxide thereof, which method successively comprises the following steps: a) a step for putting a suspension of an apatite powder in a liquid medium in contact with a salt of a metal element, which is an acetate of a metal element; b) a step for evaporating the solvant making up the liquid medium; and c) a step for calcination of the powder resulting from step b) in an oxidizing atmosphere, by means of which a composite powder is obtained, comprising an apatite core and a coating layer comprising particles of metal oxide; and d) optionally a step for total or partial reduction of said oxide metal particles into metal particles. The use of this composite powder for forming an electrode material.

Abstract: The invention relates to a process for manufacturing at least one elementary electrochemical cell comprising a first and a second electrode between which an electrolyte is intercalated, said first and second electrodes and said electrolyte being in the form of layers, which process is characterized in that it comprises: a) producing at least one structure comprising a layer of a powder of a first electrode material and a layer of a powder of a second electrode material between which a layer of a powder of an electrolyte material is intercalated; and b) simultaneously sintering all the powder layers by an electric field sintering. Applications: manufacture of energy- or hydrogen-producing electrochemical systems, in particular solid oxide fuel cells (SOFCs) or high temperature electrolysers cells (HTEs).