摘要:
On a sheet steel carrier a suspension containing a binder and nickel powderr a powder containing a nickel alloy in a volatile suspension medium is applied, with or without an additional pore-forming material, and the sintered to produce a porous sintered layer. Alternatively, this sintered layer can be obtained by depositing and consolidating the powdered mixture on the carrier with the aid of a plasma gun. A nickel/zinc alloy is then precipitated electrolytically on the sintered material thus produced and, finally, the zinc is dissolved out by dipping in lye. The carrier may be of metal and particularly a wire lattice of nickel or iron. It may also be a solid electrolyte membrane, such as a disc of .beta.-Al.sub.2 O.sub.3.
摘要:
The invention comprises an improved cathode for a chloralkali cell having grains of alpha-iron adherent to the surface of the cathode, and a process for making the cathode which comprises depositing grains of alpha-iron onto the surface of an electrically conductive cathode substrate in an electrical cell. The invention also provides a method for lowering the operating voltage of a chloralkali electrolysis cell which comprises adding iron particles to the cathode compartment of the cell.
摘要:
An improved electrode having a surface mixture of nickel and porous nickel produced by applying a paste mixture of NiAl.sub.2 and Ni.sub.3 B together with a vehicle to a substrate. After burning off the vehicle and firing in air at a temperature of 450.degree. to 650.degree. C. and thereafter sintering at a temperature of 800.degree. to 900.degree. C. in nitrogen, the coating on the substrate contains Ni.sub.2 Al.sub.3, NiAl.sub.2 B and nickel together with a thin overlayer of B.sub.2 O.sub.3. After removing the intermetallic aluminum, boron and boron oxide by dissolution with sodium hydroxide, the surface of the substrate contains Raney nickel supported on a structure of nickel. The resulting electrodes can be used as cathodes in water or brine electrolysis cells.
摘要:
A novel cathode is provided which comprises a porous titanium sheet having a cathodic exposed surface of hydrided titanium, preferably where the core of the sheet is of less porosity or higher density than the surface. The hydrided surface of the cathode may include a coating of silver thereon and therein within the pores, or the hydrided surface of the cathode, either as such or one provided with the silver coating may further include a coating of MoS.sub.2 thereon and therein within the pores. Such cathode can be either a monopolar or a bipolar electrode. The core of the cathode is of low porosity to provide improved current transfer and has a surface area of large pore size to enable low cathodic overvoltage.
摘要:
A ferrous metal cathode used in a chlor-alkali electrolytic cell has a metallic coating deposited thereon. The metallic coating is applied by either flame spraying or plasma spraying a powdered metal onto the ferrous metal surface. The metals which are utilized are those having a lower hydrogen overvoltage than iron.
摘要:
An electrode coating having the formula A2BO6, where A represents trivalent elements having anionic radius comprised between 0.50 and 0.73 Angstrom and where B represents hexavalent elements having an ionic radius comprised between 0.50 and 0.70.
摘要:
AN ELECTRODE FOR USE IN AN ELECTROLYTIC PROCESS. THE ELECTRODE HAS A CORE OF A FILM-FORMING METAL AND A LAYER HAVING AT LEAST THE OUTSIDE PORTION OF THE THICKNESS THEREOF OF AN ELECTTOLYTE RESISTANT AND ELECTROLYSIS PRODUCT RESISTANT MATERIAL, WHICH OUTSIDE PORTION HAS A THICKNESS OF AT LEAST ABOUT 0.054 MICRON. THE LAYER IS ON AT LEAST PART OF THE SURFACE OF SAID CORE. THE MATERIAL OF THE PORTION CONSISTS ESSENTIALLY OF AT LEAST ONE OXIDE WHICH IS AN OXIDE OF AT LEAST ONE PLATINUM METAL TAKEN FROM THE GROUP CONSISTING OF PLATINUM, IRIDIUM, RHODIUM, PALLADIUM, RUTHENIUM, AND OSMIUM. THE ELECTRODE IS ESPECIALLY USEFUL IN ELECTROLYSIS OF BRINE TO OBTAIN CHLORINE.
摘要:
Improved electrochemical production of hydrogen peroxide is provided with a surface-oxidized carbon catalyst. The carbon can be, for example, carbon black or carbon nanotubes. The oxidation of the carbon can be performed, for example, by heating the carbon in nitric acid, or by heating the carbon in a base. The resulting carbon catalyst can have a distinctive oxygen is peak in its X-ray photoelectron spectrum.
摘要:
Selective alloy corrosion is used to synthesize a robust and ultrafine mesoporous NiFeMn-based metal/metal oxide oxygen evolving catalyst with ligament and pore sizes in the range of 10 nm and a BET surface area of 43 m2/g. As an oxygen evolving catalyst, the mesoporous catalyst exhibits high stability (>264 hours) at a high current density (500 mA/cm2) with a low overpotential (360 mV) using a moderate electrolyte concentration (1 M KOH). The catalyst is made from non-precious metals and its fabrication is straight forward and directly applicable to large-scale synthesis.