摘要:
The invention relates to a method for optimising the conductivity provided by the displacement of H+ protons and /or OH- ions in a conductive membrane made of a material permitting the insertion of steam into said membrane, wherein said method comprises the step of inserting under pressure gaseous flow containing the steam into said membrane in order to force said steam into said membrane under a certain partial pressure so as to obtained the desired conductivity at a given temperature, said partial pressure being higher than or equal to 1 bar, a drop in the operational temperature being compensated by an increase in said partial pressure in order to obtain the same desired conductivity. The invention can be used in particularly interesting applications in the fields of high-temperature water electrolysis for producing hydrogen, of the manufacture of fuel cells using hydrogen fuel, and of hydrogen separation and purification.
摘要:
The invention relates to an electrode for an electrochemical cell which exhibits good electron conductivity and good chemical conductivity, as well as good cohesion with the solid electrolyte of the electrochemical cell. To do this, this electrode is made from a ceramic, which is a perovskite doped with a lanthanide having one or more degrees of oxidation and with a complementary doping element taken from the following group: niobium, tantalum, vanadium, phosphorus, arsenic, antimony, bismuth.
摘要:
The present invention relates to a proton-conductive electrochemical cell (10), comprising an electrolytic membrane (13) made of a ceramic and an electrode (11, 12) made of a cermet, said electrochemical cell (10) being obtained directly by a method of co-sintering a ceramic layer, capable of forming the electrolytic membrane (13), and a cermet layer, capable of forming the electrode (11, 12), in a sintering tool at a sintering temperature of the ceramic that makes it possible to render said ceramic layer, capable of forming the electrolyte (13), gas-tight, wherein said cell (10) is characterised in that said cermet consists of the mixture of a ceramic and an electronically conductive passivatable alloy including at least 40 mol % chromium capable of forming a passive layer, the nature and the chromium content of said passivatable alloy enabling said electrochemical cell to be co-sintered with a membrane densification of more than 90% without melting said alloy.
摘要:
The invention relates to a method for preparing mineral particles (p) from mineral particle precursors, said method comprising a step (E) that comprises injecting a fluid medium (F) containing said precursors in solution and/or dispersed in a solvent in a reactor containing CO2 at a supercritical state using an injection nozzle giving into an area where the supercritical CO2 is at a temperature higher than or equal to the conversion temperature of the precursors into corresponding mineral species, the invention also relates to particles (p) obtained according to the method and to the use thereof.
摘要:
The subject of the present invention is a method for producing a gas separation membrane, comprising the deposition of a film from a silica sol onto a porous support followed by heat treatment of the film thus deposited, in which the silica sol deposited is prepared by hydrolysing a silicon alkoxide in the presence of a doping amount of a precursor of an oxide of a trivalent element, especially boron or aluminium. The invention also relates to the membranes as obtained by this method, and also to their uses, especially for the separation of helium or hydrogen at high temperature, and in particular for removing impurities in helium streams.
摘要:
The invention relates to an anionically conductive electrolyser comprising an electrochemical cell (10) formed by a solid electrolyte (13) formed by a ceramic; a first electrode (11) forming the anode of said electrochemical cell (10); and a second electrode (12) forming the cathode of said electrochemical cell (10), said solid electrolyte (13) being arranged between said first electrode (11) and said second electrode (12). Said electrolyser is characterised in that said solid electrolyte (13) consists of zirconium oxide doped with erbium oxide.
摘要:
The present invention relates to a method for treating CO 2 by electrochemical hydrogenation, said method comprising: a step of transferring heat from a heating means (160) towards a proton-conductive electrolyser (110) such that said electrolyser (110) reaches an operating temperature suitable for electrolysing steam; a step of feeding the CO 2 produced by said heating means (160) at the cathode of the electrolyser; a step of feeding the steam at the anode; a step of oxidising the steam at the anode; a step of generating protonated species in the membrane with proton conduction; a step of migrating said protonated species into said proton-conductive membrane; a step of reducing said protonated species on the surface of the cathode into reactive hydrogen atoms; and a step of hydrogenating the CO 2 on the surface of the cathode of the electrolyser (110) by means of said reactive hydrogen atoms, said hydrogenation step enabling the formation of C x H y O z compounds, where x≥1; 0
摘要:
The present invention relates to a method for generating hydrogen and oxygen adsorbates by steam electrolysis at 200 to 800°C using an electrolysis cell (30) comprising a solid electrolyte (31) which is made of a proton-conducting ceramic and which is arranged between an anode (32) and a cathode (33), each of which comprises a proton-conducting ceramic, and the ratio of the electroactive surface to the geometric surface of each of which is equal to at least 10, said method comprising the following steps: circulating a current between the anode (32) and the cathode (33), wherein the density of the current is no less than 500 mA/cm 2 ; inserting water in the form of steam, which is fed under pressure to the anode (32); oxidizing said water in the form of steam at the anode (32), and generating highly reactive oxygen at the anode (32) after said oxidation; generating protonated species in the electrolyte (31) after said oxidation and migrating said protonated species in the electrolyte (31); and reducing said protonated species at the surface of the cathode (33) in the form of reactive hydrogen atoms.
摘要:
The present invention relates to a process for electrolysing steam introduced under pressure into an anode compartment (32) of an electrolyser (30) provided with a proton-conducting membrane (31) made of a material that allows protonated species to be incorporated into this membrane under steam, water injected in steam form being oxidized at the anode (32) so as to generate protonated species in the membrane that migrate within this same membrane and are reduced at the surface of the cathode (33) in the form of reactive hydrogen atoms capable of reducing carbon dioxide and/or carbon monoxide, said process comprising the following steps: injection of CO 2 and/or CO under pressure into the cathode compartment (33) of the electrolyser (30); - reduction of the CO 2 and/or CO injected into the cathode compartment (33) by said reactive hydrogen atoms generated, in such a way that the CO 2 and/or the CO form compounds of the C x H y O z type where x>1, y is between 0 and 2x+2 and z is between 0 and 2x.