Alternative installation of a gas diffusion electrode in an electrochemical cell having percolator technology
A gas diffusion electrode, electrochemical technology, applied in the field of electrochemical instruments, can solve the problems of difficult replaceability of welding area, loss of electrolytic surface, etc.
Inactive Publication Date: 2014-01-01
UHDENORA +1
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Problems solved by technology
However, since in this case the connection of the frame to the basic structure is also carried out by means of welding or soldering methods in order to minimize ohmic losses, both the difficult replaceability of the welded area and the presence of active electrolytic surfaces remain loss
Method used
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Embodiment Construction
[0040] figure 1 , 2 and 3 show an electrochemical cell according to the invention comprising a positive half-shell 12 and a negative half-shell 11 which are separated by a membrane 5 . The two half-shells 11 , 12 have outer walls 13 and frame-like flange regions 14 a , 14 b , 15 a , 15 b. The flange areas 15a, 15b of the negative half-shell and the flange areas 14a, 14b of the positive half-shell form contact areas at the upper end 19 of the electrolytic cell and at the lower end 16 of the electrolytic cell, with internal components such as the membrane 5, porous The medium 8, the frame seal 6 and possibly other components are clamped between these contact areas. By means of this clamping, for example, the membrane 5 and the porous medium 8 can be secured. The porous medium acts as a percolator during the operation of the electrochemical cell, wherein the electrolyte flowing into the electrochemical cell through the electrolyte inflow opening 9 flows between the membrane 5 ...
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The invention relates to an electrochemical cell comprising an anode half shell (12) and a cathode half shell (11) which are separated from one another by means of a membrane (5) and having the corresponding electrodes, the anode half shell (12) and the cathode half shell (11), which each have an outer wall (13) and each have flange regions (14a, 14b, 15a, 15b) in the contact region of the two half shells, which flange regions are configured in the form of a frame, and a gas diffusion electrode (3) which consists of a liquid-permeable support which is coated with a catalyst material, where the gas diffusion electrode (3) has a region at its outer margin (17) which is not coated with catalyst and projects at the lower end of the electrochemical cell (16) in the contact region of the two half shells between the flange regions of the outer wall of the cathode half shell (15b) and the flange regions of the outer wall of the anode half shell (14b) and a porous medium (8) is arranged parallel between the gas diffusion electrode (3) and the membrane (5), and also facilities for the introduction and discharge of gas (20, 21) and electrolyte (9, 10), where a gas space (22) is separated from an electrolyte space (7) by appropriate means (23). In particular, the present invention is characterized in that profile internals (1), into which an upper margin (19) of the gas diffusion electrode (3) projects, on which a seal (2) which fixes the gas diffusion electrode (3) into the profile internals (1) is installed, are provided in the electrolyte space (7) in the cathode half shell (11), where the gas diffusion electrode (3) has a bending radius a of < 90° relative to the verticals of the clamped gas diffusion electrode.
Description
technical field [0001] The present invention can be classified in the technical field of electrochemical instruments. [0002] The invention relates to an electrochemical device as described in the preamble of claim 1 . A device therein means a device in which an electrochemical reaction takes place, as in an electrolyzer, battery, accumulator or fuel cell. Background technique [0003] For example, in electrolysis, electrical energy is converted into chemical energy. This is achieved through the decomposition of chemical compounds under the action of an electric current. The solution used as the electrolyte contains positively and negatively charged ions. Therefore, acid, alkali or salt solutions are mainly used as the electrolyte. [0004] For example, in the electrolytic production of halogen gas from an aqueous alkali metal halide solution, shown here as sodium chloride, the following reaction takes place on the positive side: [0005] 4NaCl→2Cl 2 +4Na + +4e - ...
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IPC IPC(8): C25B9/02C25B9/08C25B9/19
CPCC25B9/18H01M4/86Y02E60/521C25B9/02H01M8/0276C25B9/08H01M8/028H01M8/1002H01M8/1007Y02E60/50C25B9/63C25B9/70C25B9/19H01M8/2483H01M8/0273H01M8/241
Inventor P·沃尔特林R·基弗R·韦伯A·布兰
Owner UHDENORA