CH100171A - Anode for making per compounds. - Google Patents
Anode for making per compounds.Info
- Publication number
- CH100171A CH100171A CH100171DA CH100171A CH 100171 A CH100171 A CH 100171A CH 100171D A CH100171D A CH 100171DA CH 100171 A CH100171 A CH 100171A
- Authority
- CH
- Switzerland
- Prior art keywords
- platinum
- anode
- per compounds
- tantalum
- making per
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
- C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
- C25B11/073—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material
- C25B11/075—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of a single catalytic element or catalytic compound
- C25B11/081—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of a single catalytic element or catalytic compound the element being a noble metal
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Electrolytic Production Of Metals (AREA)
Description
Anode zur Herstellung von Perverbindtingen. Um bei Elektrolysen Anoden aus reinem Platin zu vermeiden, ist man so vorgegangen, dass man Tantal in Form von Draht, oder Blech auf elektrolytischem Wege mit Platin überzog, derart, dass die ganze TantalfläcIie einen zusammenhängenden Überzug aus Pla tin erhielt, so dass also eine Berührung des Elektrolyten mit der Tantalunterlage ausge schlossen war.
Bei der kurzdauernden Ver- wen,dung solcher mit Platin plattierter Ano den zu analytischen Zwecken haben sieh die selben cut bewährt. Bei dem Versuch jedoch, solche Anoden im technischen Dauerbetrieb zur Herstellung von Perverbinclungen zu ver wenden, zeigten sie nur geringe Haltbarkeit; ein Teil des Platinüberzuges blieb auf der Unterlage haften, ein anderer Teil jedoch zeigte eine so geringe Haftfestigkeit, dass nach kurzer Elektrolysendauer die Platin teilchen nach und nach in den Elektrolvt übergingen.
Überraschenderweise konnte mit einer so beschädigten Elektrode die Elektrolyse zweeks Herstellung von Perverbindungen doch noch durchgeführt werden, solange eben noch nennenswerte Platiumengen in genü- gen-dem Kontakt mit der Unterlage waren, um den Stromdurchgang zu vermitteln.
Ein Dauerbetrieb mit einer derart beschaffenen Elektrode ist<B>jedoch</B> ersichtlicherweise nicht möglich, zumal durch Verminderung der Be rührungsfläche zwischen Tantal und Platin ein Anetieg der Spannung, eine Verminde rung der Stromausbeute und damit eine Verteuerung der Fabrikation erfolgt.
Was am meisten überraschen muss, ist die Feststellung, dass das Zutagetreten der Tan- taloberflä)che entweder als Metall oder im oxydierten Zustand auf den Bildungsprozess undauf den Bestand der gebildeten Perver- bindungen nicht den geringsten schädlichen Einfluss ausübt.
Dieses Verhalten der gegen metallhaltige Katalysatoren sonst so überaus empfindlichen Perverbindungen gibt nun die Möglichkeit, bei Verwendung geringster Pla tinmengen sehr stabile und dauerhafte Elek- troclen herzustellen.
Die Herstellung einer Platinauflage auf einer Tantalunterlage, dergestalt, dass nicht ,die ganze Tantalfläche mit Platin überzogen wird, ist technisch wesentlich einfacher und billiger zu lösen, als das Umhüllen fles ",e- samten Tantalkörpers mit dem teuren Platir. Die Auflage kann zum Beispiel bewirkt wer den durch Elektrolyse oder durch Aufb:#i,m- mern, Aufschweissen, Aufwalzen und der gleichen.
Anode for the production of connector pieces. In order to avoid anodes made of pure platinum in electrolysis, the procedure was that tantalum in the form of wire or sheet metal was electrolytically coated with platinum in such a way that the entire tantalum surface received a coherent coating of platinum, so that one Contact of the electrolyte with the tantalum pad was excluded.
In the short-term use of such platinum-plated anodes for analytical purposes, the same cuts have proven effective. However, when attempting to use such anodes in continuous technical operation for the production of Perverbinclungen, they showed only a low durability; Part of the platinum coating remained adhering to the base, but another part showed such a poor adhesive strength that after a short period of electrolysis the platinum particles gradually passed into the electrolvt.
Surprisingly, with an electrode damaged in this way, the electrolysis for the production of per compounds could still be carried out as long as significant amounts of platinum were in sufficient contact with the substrate to convey the passage of current.
Continuous operation with such an electrode is obviously not possible, especially since the reduction in the contact area between tantalum and platinum increases the voltage, decreases the current yield and thus increases the cost of manufacture.
What must be the most surprising is the finding that the exposure of the tannin surface, either as metal or in the oxidized state, does not have the slightest harmful influence on the formation process and on the existence of the per-compounds formed.
This behavior of the per-compounds, which are otherwise extremely sensitive to metal-containing catalysts, now makes it possible to produce very stable and permanent electrics using the smallest amounts of platinum.
The production of a platinum overlay on a tantalum base, in such a way that the entire tantalum surface is not coated with platinum, is technically much easier and cheaper to solve than wrapping the entire tantalum body with the expensive platinum caused by electrolysis or by building up: # i, ming, welding, rolling and the like.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH100171T | 1922-06-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH100171A true CH100171A (en) | 1923-07-16 |
Family
ID=4358446
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH100171D CH100171A (en) | 1922-06-12 | 1922-06-12 | Anode for making per compounds. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH100171A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1094245B (en) * | 1955-12-14 | 1960-12-08 | Pennsalt Chemicals Corp | Lead dioxide electrode for use in electrochemical processes |
DE1217345B (en) * | 1957-04-09 | 1966-05-26 | Amalgamated Curacao Patents Co | Process for the production of an anode for the electrolysis of electrolytes containing chlorine ions |
DE1281232B (en) * | 1957-07-17 | 1968-10-24 | Ici Ltd | Anode for cathodic corrosion protection |
-
1922
- 1922-06-12 CH CH100171D patent/CH100171A/en unknown
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1094245B (en) * | 1955-12-14 | 1960-12-08 | Pennsalt Chemicals Corp | Lead dioxide electrode for use in electrochemical processes |
DE1105854B (en) * | 1955-12-14 | 1961-05-04 | Pennsalt Chemicals Corp | Lead dioxide electrode for electrolytic processes |
DE1217345B (en) * | 1957-04-09 | 1966-05-26 | Amalgamated Curacao Patents Co | Process for the production of an anode for the electrolysis of electrolytes containing chlorine ions |
DE1281232B (en) * | 1957-07-17 | 1968-10-24 | Ici Ltd | Anode for cathodic corrosion protection |
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