DE406036C - Galvanic element with positive electrode made of porous carbon - Google Patents

Description

GERMAN EMPIRE

ISSUED NOVEMBER 13, 1924

REICH'S PATEN OFFICE

PATENT LETTERING

- JHt 406036 - CLASS 21b GROUP 7

(F 53292

Dr. Charles Jean Victor Fery in Paris.

Galvanic element with positive electrode made of porous carbon. Patented in the German Empire on January 20, 1923.

According to the Union Treaty of June 2, 1911, priority is due to this application of the application in France of December 27, 1922.

With the galvanic elements, whose de-; rosity are most effective. The application

polarization occurs through air, the amount of charcoal used to produce electrical

Effectiveness of the electrode, which generally has certain disadvantages. To-

is made of coal, mainly from the ^! next, due to its large

The catalyzing properties of this coal ßen porosity worse than retort carbon

* away. On the other hand, it is known that elec- or graphite, which are much denser.

■> Troden from charcoal because of its large po-. On the other hand, all binding methods have though

the advantage of increasing the conductivity of the mass, but the disadvantage of increasing the porosity to reduce by more or less clogging the fine channels of the charcoal. Another disadvantage arises from the fact that after a certain period of use the Charcoal electrode loses a large part of its catalyzing effectiveness because their pores are clogged by the oxides of zinc deposited in them.

The invention relates to a galvanic element, whose depolarization by Air takes place, and with its electrode the catalyzing properties of the charcoal are exploited; but the electrode is designed in such a way that the aforementioned inconveniences is remedied.

The new element is essentially characterized in that the positive electrode from a tubular body made of highly conductive carbon, e.g. B. retort carbon, consists, which is open at both ends and charcoal in the form of powder or small Contains pieces. This charcoal is going through inside the tubular body a canvas attached to this or a porous one permeable to liquids and gases Wall held.

The negative electrode is in a manner known per se on the bottom of the vessel under j half of the positive electrode opposite the; in the latter contained catalyzing wood! coal mass arranged horizontally.

This arrangement provides the following main \ ^r enefits: it ensures a very large [contact area between the conductive positive,

tive electrode and the catalyzing wooden j

carbon mass in which the depolarization takes place j gen should, and it enables the exploitation of j

of the total volume of the catalyzing j mass, because the latter depends on the conductive elec- |

trode is surrounded. j

The invention can be applied to elements! ■

with liquid electrolytes as well as with sol- ''

with immobile electrolytes!

be applied. ;

For a better understanding in the drawing is, for example, an embodiment \ of an element according to the invention provided DAR ι. The drawing shows a vertical section through such an element. The positive electrode consists of a ^: made of highly conductive carbon, e.g. B. retort carbon, existing tubular body α of ge; small wall thickness. This tubular body, which is open at both ends, contains charcoal b in the form of powder or small pieces. The charcoal mass will:

held inside the tubular body a at its upper and lower parts by canvas pieces c, d fixed by any suitable means. The ^; Catalyzing charcoal mass could also: rest on a floor made up of a porous

Partition wall consists, for example, of a 'ceramic disc made of lightly fired; or burned-up porcelain, which is attached to the pipe-shaped body α by means of a carbon cement.

! The positive electrode described is immersed in a vessel c containing the electrolyte consisting, for example, of ammonia solution and is held at a certain distance from the bottom of this vessel. For this purpose, the tube body a can be attached to the lid / the vessel e . L ^T m clogging of the pores of the catalyzing char mass b avoid ', which may form during use of the element by the sparingly soluble zinc salts, the zinc negative electrode is g at the bottom of the vessel e, and indeed preferably arranged horizontally. The current connection of this negative electrode is made by a conductive wire h, which is protected inside the element by an insulating sleeve i.

Of course, the embodiment described is only an example, and any other arrangement can be used to create the interface between the charcoal mass and the conductive electrode to multiply, for example, could the latter, instead of being cylindrical, has the shape of a parallelepiped of rectangular cross-section to have.

Charcoal can be used to increase the conductivity of the catalyzing mass Mix in a certain amount of highly conductive carbon, for example graphite.

Claims (1)

Patent claim: Galvanic element with positive, only partially immersed in the electrolyte Electrode made of porous carbon and air depolarization, characterized in that the positive electrode by a tubular vertical body made of highly conductive charcoal that is open at both ends and has charcoal inside Contains powder form or very small bits that are passed through an am tubular Body attached, porous partition (canvas, porcelain, etc.) permeable to liquids and gases will. 1 sheet of drawings.