Preparation and use of electrodes in the electrolysis of alkali halides
A process is described for electrolysis of aqueous solutions of sodium chloride in an electrolytic cell comprising an anolyte compartment and catholyte compartment separated by a diaphragm to produce an aqueous solution of sodium hydroxide in the catholyte compartment, and chlorine in the anolyte compartment. The cathode of the process is a low hydrogen overvoltage cathode made by applying to an electroconductive substrate a coating solution of nickel oxide and ruthenium oxide precursor compounds and an etchant capable of etching the surface of the substrate and/or any previously applied coating. Heating is done to remove volatiles from the so-coated substrate to cause the metal values of the precursor compounds and those etched from the substrate or previously applied coating. Further, heating is performed in the presence of oxygen, air or an oxidizing agent, to a temperature sufficient to oxidize the metal values, thereby obtaining on the substrate an electrocatalytically-active heaterogeneous metal oxide structure comprising RuO/sub 2/ and NiO.
- Assignee:
- Dow Chemical Co., Midland, MI
- Patent Number(s):
- US 4572770
- OSTI ID:
- 6049232
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
BATTERY SEPARATORS
CHALCOGENIDES
CHEMICAL PREPARATION
CHLORIDES
CHLORINE COMPOUNDS
COATINGS
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRODES
ELECTROLYSIS
ELECTROLYTIC CELLS
ELEMENTS
FABRICATION
HALIDES
HALOGEN COMPOUNDS
HYDROGEN
LYSIS
MIXTURES
NICKEL COMPOUNDS
NICKEL OXIDES
NONMETALS
OVERVOLTAGE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
RUTHENIUM COMPOUNDS
RUTHENIUM OXIDES
SODIUM CHLORIDES
SODIUM COMPOUNDS
SOLUTIONS
SUBSTRATES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS