Abstract

The present invention relates to an electrode assembly and an electrolyser using one or more of said assemblies, in particular the present invention provides an electrode assembly for the production of hydrogen comprising: i) an anode structure which comprises an anode located within an electrolysis compartment, ii) a cathode structure which comprises a cathode located within an electrolysis compartment containing a solution of an alkali metal hydroxide, characterised in that the cathode comprises: a) An electrically conductive metal substrate, and b) An electrocatalytic layer on the substrate and comprising a, at least one metal selected from platinum group metals, rhenium, nickel, cobalt and molybdenum and b. at least 50% by volume of an electrically conductive support material, wherein the electrically conductive support material is formed from particles having an average particle size of less than 5 microns (5 μm) and which are not metallic particles.

IPC Classes  ?

• C25B 1/02 - Hydrogen or oxygen
• C25B 1/04 - Hydrogen or oxygen by electrolysis of water
• C25B 1/24 - Halogens or compounds thereof
• C25B 1/26 - ChlorineCompounds thereof
• C25B 9/40 - Cells or assemblies of cells comprising electrodes made of particlesAssemblies of constructional parts thereof
• C25B 9/73 - Assemblies comprising two or more cells of the filter-press type
• C25B 9/77 - Assemblies comprising two or more cells of the filter-press type having diaphragms
• C25B 11/031 - Porous electrodes
• C25B 11/037 - Electrodes made of particles
• C25B 11/053 - Electrodes comprising one or more electrocatalytic coatings on a substrate characterised by multilayer electrocatalytic coatings
• C25B 11/065 - Carbon
• C25B 11/081 - Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalysts material consisting of a single catalytic element or catalytic compound the element being a noble metal

Abstract

The present invention relates to an electrode assembly and an electrolyser using one or more of said assemblies, in particular the present invention provides an electrode assembly for the production of hydrogen comprising: i) an anode structure which comprises an anode located within an electrolysis compartment, ii) a cathode structure which comprises a cathode located within an electrolysis compartment containing a solution of an alkali metal hydroxide, characterised in that the cathode comprises: a) An electrically conductive metal substrate, and b) An electrocatalytic layer on the substrate and comprising a. at least one metal selected from platinum group metals, rhenium, nickel, cobalt and molybdenum and b. at least 50% by volume of an electrically conductive support material,wherein the electrically conductive support material is formed from particles having an average particle size of less than 5 microns (5 µm) and which are not metallic particles.

IPC Classes  ?

• C25B 1/02 - Hydrogen or oxygen
• C25B 1/04 - Hydrogen or oxygen by electrolysis of water
• C25B 1/16 - Hydroxides
• C25B 1/46 - Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis in diaphragm cells
• C25B 11/04 - ElectrodesManufacture thereof not otherwise provided for characterised by the material

Abstract

The present invention relates to an electrode assembly and an electrolyser using one or more of said assemblies, in particular the present invention provides an electrode assembly for the production of hydrogen comprising: i) an anode structure which comprises an anode located within an electrolysis compartment, ii) a cathode structure which comprises a cathode located within an electrolysis compartment containing a solution of an alkali metal hydroxide, characterised in that the cathode comprises: a) An electrically conductive metal substrate, and b) An electrocatalytic layer on the substrate and comprising a. at least one metal selected from platinum group metals, rhenium, nickel, cobalt and molybdenum and b. at least 50% by volume of an electrically conductive support material,wherein the electrically conductive support material is formed from particles having an average particle size of less than 5 microns (5 µm) and which are not metallic particles.

IPC Classes  ?

• C25B 1/02 - Hydrogen or oxygen
• C25B 1/16 - Hydroxides
• C25B 11/04 - ElectrodesManufacture thereof not otherwise provided for characterised by the material
• C25B 1/04 - Hydrogen or oxygen by electrolysis of water
• C25B 1/46 - Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis in diaphragm cells
• C25B 9/00 - Cells or assemblies of cellsConstructional parts of cellsAssemblies of constructional parts, e.g. electrode-diaphragm assembliesProcess-related cell features

Abstract

The present invention relates to an electrode assembly, electrode structures and an electrolyser using said assemblies/structures, and in particular provides an electrode assembly comprising an anode structure and a cathode structure, each of said anode structure and cathode structure comprising i) a flange which can interact with a flange on an another electrode structure to hold a separator in between the two, ii) an electrolysis compartment which contains an electrode, and which in use contains a liquid to be electrolysed, iii) an inlet for the liquid to be electrolysed and iv) an outlet header for evolved gas and spent liquid, wherein the outlet header on one of the anode structure and the cathode structure is an external outlet header and the outlet header on the other one of the anode structure and the cathode structure is an internal outlet header, as well as to electrolysers comprising a plurality of such electrode assemblies.

IPC Classes  ?

• C25B 9/00 - Cells or assemblies of cellsConstructional parts of cellsAssemblies of constructional parts, e.g. electrode-diaphragm assembliesProcess-related cell features
• C25B 9/18 - Assemblies comprising a plurality of cells
• C25B 1/24 - Halogens or compounds thereof
• C25B 15/08 - Supplying or removing reactants or electrolytesRegeneration of electrolytes
• C25B 9/19 - Cells comprising dimensionally-stable non-movable electrodesAssemblies of constructional parts thereof with diaphragms
• C25B 9/77 - Assemblies comprising two or more cells of the filter-press type having diaphragms

Abstract

C) are less than 1.

IPC Classes  ?

• C25D 17/10 - Electrodes
• C25D 17/12 - Shape or form
• C25D 21/12 - Process control or regulation
• C25B 1/24 - Halogens or compounds thereof
• C25B 9/20 - Assemblies comprising a plurality of cells of the filter-press type
• C25B 15/08 - Supplying or removing reactants or electrolytesRegeneration of electrolytes
• C25B 9/06 - Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof

Abstract

This invention relates to gaskets, apparatus incorporating said gaskets and to methods of using them. In particular, there is provided a gasket comprising a closed loop of resilient material, the loop having an inner periphery and an outer periphery, the gasket having a first thickness at a first position which is between 0% and 30% of the gasket width away from the outer periphery, a second thickness at a second position measured at a point at least 50% of the gasket width from the first position, and a third thickness at a third position intermediate the first and second positions and at least 10% of the gasket width from each, the first thickness being greater than the third thickness which is greater than the second thickness, and wherein either a said gasket reduces in thickness from the first thickness to the third thickness and then to the second thickness via one or more tapered sections which taper linearly to a reduced thickness in the direction towards the inner periphery, or b said gasket reduces in thickness from the first thickness to the third thickness via one or more steps which step to a reduced thickness in the direction towards the inner periphery and then from the third thickness to the second thickness via one or more steps which step to a reduced thickness in the direction towards the inner periphery, or c said gasket reduces in thickness from the first thickness to the third thickness and then to the second thickness via a combination of one or more steps and one or more tapered sections as defined above.

IPC Classes  ?

• C25B 9/08 - Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
• C25B 13/02 - DiaphragmsSpacing elements characterised by shape or form
• C25B 9/00 - Cells or assemblies of cellsConstructional parts of cellsAssemblies of constructional parts, e.g. electrode-diaphragm assembliesProcess-related cell features
• H01M 8/0276 - Sealing means characterised by their form
• H01M 8/0284 - Organic resinsOrganic polymers
• C25B 1/46 - Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis in diaphragm cells
• C25B 9/20 - Assemblies comprising a plurality of cells of the filter-press type
• C25B 15/00 - Operating or servicing cells
• F28D 9/00 - Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall

Abstract

This invention relates to gaskets, apparatus incorporating said gaskets and to methods of using them. In particular, there is provided a gasket comprising a closed loop of resilient material, the loop having an inner periphery and an outer periphery, the gasket having a first thickness at a first position which is between 0% and 30% of the gasket width away from the outer periphery, a second thickness at a second position measured at a point at least 50% of the gasket width from the first position, and a third thickness at a third position intermediate the first and second positions and at least 10% of the gasket width from each, the first thickness being greater than the third thickness which is greater than the second thickness, and wherein either a said gasket reduces in thickness from the first thickness to the third thickness and then to the second thickness via one or more tapered sections which taper linearly to a reduced thickness in the direction towards the inner periphery, or b said gasket reduces in thickness from the first thickness to the third thickness via one or more steps which step to a reduced thickness in the direction towards the inner periphery and then from the third thickness to the second thickness via one or more steps which step to a reduced thickness in the direction towards the inner periphery, or c said gasket reduces in thickness from the first thickness to the third thickness and then to the second thickness via a combination of one or more steps and one or more tapered sections as defined above.

IPC Classes  ?

• C25B 9/60 - Constructional parts of cells
• F16J 15/06 - Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
• F28F 9/04 - Arrangements for sealing elements into header boxes or end plates

Goods & Services

Apparatus and instruments for use in electrochemistry, the chioralkali industry, the production of chlorine, caustic soda or potassium hydroxide, namely, electrolysers, electrodes, ion exchange membranes and membrane cells