摘要:
The invention provides a membrane for separating molecules from mixtures, which membrane consists virtually exclusively of molecular sieve crystals, has a thickness of 0.01-10 mm and has a separating top layer with a thickness of 0.01-10 νm and an effective pore size of less than 1.5 nm, which pore size can be adjusted depending on the molecules to be separated off. The separating membrane can be produced by a method in which: a) pulverulent molecular sieve material and oxides constituting the molecular sieve material, especially zeolite and kaolin and/or silicon dioxide, are mixed, preferably in the presence of water; b) the mixture is shaped; c) the moulding is calcined; d) the calcined moulding is treated with an aqueous solution which promotes crystallisation; and e) the moulding is treated with a solution of the oxides constituting the molecular sieve material, and then rinsed and dried. The separating membrane can consist of one component or be combined with, for example, an alumina support. The membrane can also be rendered catalytically active by treatment with hydrogen ions or with catalytic metals.
摘要:
A molten alkali metal carbonates fuel cell porous anode of lithium ferrite and a metal or metal alloy of nickel, cobalt, nickel/iron, cobalt/iron, nickel/iron/aluminum, cobalt/iron/aluminum and mixtures thereof wherein the total iron content including ferrite and iron of the composite is about 25 to about 80 percent, based upon the total anode, provided aluminum when present is less than about 5 weight percent of the anode. A process for production of the lithium ferrite containing anode by slipcasting.
摘要:
A method of manufacturing a photovoltaic cell, comprises: - providing a semiconductor substrate of a first conductivity type; - creating at least one via between a front side and a back side of the semiconductor substrate; - applying on the backside a front side contacting metal paste over the at least one via, the front side contacting metal paste comprising a first contacting metal; - annealing the semiconductor substrate so as to melt the first contacting metal, and during annealing, creating at least on the walls of the at least one via an alloy of the first contacting metal and the semiconductor substrate material.
摘要:
Sealing socket (1) and method for arranging a sealing socket to a tube (2). A sealing socket (1) comprises a sleeve (3) having an outer dimension somewhat larger than the tube (2) to be sealed, defining an annular compartment (4) between the tube (2) and the sleeve (3), in which a gasket (6) is introduced. The gasket material is pressurised by a pressure ring (7) which is permanently connected by welding (8) to the sleeve (3).
摘要:
Method for determining the utilisation of a reactant at the anode side or cathode side of a fuel cell. To this end a low flow with high utilisation is applied at the side to be measured and an appreciable flow with low utilisation is applied at the other side. A table is compiled in which the relationship between the Nernst voltage under the outlet conditions, such as the temperature, and the utilisation of the reactant to be measured is incorporated. Cell voltage is then measured at the outlet and is equated to the Nernst voltage. The utilisation can be determined from the table. This method can be used for determination of the flow rate and the flow distribution in a stack of electrochemical cells.
摘要:
Solar cell, comprising at least three substantially thin film parallel silicon layers, stacked upon each other, and at least two conductors providing an electrical contact with at least two of said layers, said conductors extending in a direction substantially transverse with respect to said layers, wherein the thin film layers are provided by amorphous silicon of the p-type (p-Si), intrinsic amorphous silicon (i-Si) and amorphous silicon of the n-type (n-Si) respectively, in the order given by the formula (I): p-Si, (i-Si, n-Si, i-Si, p-Si)x, i-Si, n-Si, where preferably 0≤x≤5, the amorphous silicon is hydrogenated in a concentration in the range of about 1 at.% - about 10 at.% relative to Si, preferably in a concentration of about 1 at.% relative to Si, one of said conductors provides an electrical contact with each of said p-Si layers and the other of said conductors provides an electrical contact with each of said n-Si layers. A certain amount of crystalline silicon of the p-type is provided within a p-Si layer, and a certain amount of crystalline silicon of the n-type is provided within an n-Si layer.
摘要:
In order to improve the electrical contact between electrode (11) and current collector (13) in a fuel cell containing a liquid carbonate (10) as the electrolyte it is proposed that between the electrode and the current collector a functional layer (12) be placed. The electrode (11) consists of a material based on lithium cobaltate, and the functional layer (12) is attached thereto. This functional layer, like the electrode, is preferably applied in the green state, and after assembly of the cell, the ultimate electrochemical fuel cell is obtained by sintering.
摘要:
The invention relates to a tape suitable for use in fuel cells, to an electrode suitable for use in a fuel cell, to a method for sintering an electrode of this type and to a fuel cell which contains an electrode of this type. The invention provides a tape with improved properties, which is characterised in that said tape contains LiC 0 0 2 . A tape of this type can be produced in a manner known per se using LiCo0 2 and a binder. Expediently, a plasticiser and/or dispersant and/or anti-foam is used together with the binder, as is known per se for the preparation of tapes. Platelets can be produced from such a tape, which platelets can then be sintered, optionally after stack-ing. Sintering is expediently carried out in an atmosphere consisting of 60 to 80% air and 40 to 20% carbon dioxide, in particular 68 to 72% air and 28 to 32% carbon dioxide. A suitable temperature programme is chosen for sintering. Good results are obtained by heating to 250° C at a heating rate of 100°C per hour, then heating to 450° C at a heating rate of 50° C per hour, then heating at a heating rate of 100°C per hour to the desired sintering temperature of 800 to 1000°C and finally, after sintering, cooling to room temperature at a rate of 100°C per hour. Of course, the invention also relates to fuel cells which are provided with a material according to the invention.
摘要:
The invention provides a powdered starting material for a nickel-based alloy for manufacturing a porous anode of a fuel cell containing 0.5 to 10% by weight of aluminium, titanium and/or zirconium. The powder is manufactured using a mixture of carbonyl nickel powder and a powder of an intermetallic aluminium, titanium and/or zirconium compound having a particle size of 1 to 10 microns. The powder is produced by mixing the carbonyl nickel powder with an amount of an intermetallic compound such that 0.5 to 10% by weight of the desired element or elements is present in the anode material, the intermetallic compound having a particle size of 1 to 10 mm. An anode for a fuel cell can be produced from the powder by applying the powder to a substrate and sintering it at 900 to 1100°C.