Abstract: An electrode for evolution of gas in electrolytic processes having a substrate of valve metal and a catalytic coating having two layers. A first layer having oxides of valve metal, ruthenium and iridium and a second layer having one or more metals chosen from amongst elements of the platinum group.

Abstract: Provided is a method of preventing reverse current flow through an ion exchange membrane electrolyzer, which method is capable of preventing a reverse current from being generated after stopping operation of the ion exchange membrane electrolyzer. A method of preventing reverse current flow through an ion exchange membrane electrolyzer 100, the ion exchange membrane electrolyzer 100 having an anode chamber 107 housing an anode, a cathode chamber 110 housing a cathode, an anode solution-supplying manifold 121 to feed anode solution to the anode chamber 107, and a cathode solution-supplying manifold 124 to feed cathode solution to the cathode chamber 110.

Abstract: Provided is a method of preventing reverse current flow through an ion exchange membrane electrolyzer, which method is capable of preventing a reverse current from being generated after stopping operation of the ion exchange membrane electrolyzer. A method of preventing reverse current flow through an ion exchange membrane electrolyzer 100, the ion exchange membrane electrolyzer 100 having an anode chamber 107 housing an anode, a cathode chamber 110 housing a cathode, an anode solution-supplying manifold 121 to feed anode solution to the anode chamber 107, and a cathode solution-supplying manifold 124 to feed cathode solution to the cathode chamber 110.

Abstract: An electrowinning method of metals through electrolysis of a metal chloride solution uses an anode comprising a substrate comprising titanium or titanium alloy, and a coating layer comprising a plurality of a unit layer, provided on the surface of the substrate. The unit layer comprises the first coating layer comprising a mixture of iridium oxide, ruthenium oxide and titanium oxide and the second coating layer comprising a mixture of platinum and iridium oxide. The first coating layer contacts with the surface of said substrate and an outer coating layer of the unit layer formed on the outermost layer of said coating layer is the second coating layer. The coating layer is formed by thermal decomposition baking, which followed by post-baking at a higher baking temperature.

Abstract: Subject The present invention aims to provide an anode for electrolysis by an ion exchange membrane process and the manufacturing method thereof which can show a lower concentration of by-product oxygen gas in chlorine gas and a lower overvoltage stably for a long time, compared with conventional anodes.

Abstract: An electrowinning method of metals through electrolysis of a metal chloride solution uses an anode comprising a substrate comprising titanium or titanium alloy, and a coating layer comprising a plurality of a unit layer, provided on the surface of the substrate. The unit layer comprises the first coating layer comprising a mixture of iridium oxide, ruthenium oxide and titanium oxide and the second coating layer comprising a mixture of platinum and iridium oxide. The first coating layer contacts with the surface of said substrate and an outer coating layer of the unit layer formed on the outermost layer of said coating layer is the second coating layer. The coating layer is formed by thermal decomposition baking, which followed by post-baking at a higher baking temperature.

Abstract: Subject The present invention aims to provide an anode for electrolysis by an ion exchange membrane process and the manufacturing method thereof which can show a lower concentration of by-product oxygen gas in chlorine gas and a lower overvoltage stably for a long time, compared with conventional anodes.