Chlorine gas evolution electrode and preparation method thereof

Abstract

The invention discloses a chlorine gas precipitation electrode and a preparation method thereof. The electrode comprises a metal substrate, the surface of the metal substrate is coated with a metal oxide coating with the catalytic effect, the metal oxide coating consists of a ruthenium metal oxide, an iridium metal oxide, a titanium metal oxide and a tin metal oxide, wherein in the metal oxide coating, calculated according to metal compositions, the molar ratio of the ruthenium element is 7%-15%, the molar ratio of the iridium element is 1%-4.8%, the molar ratio of the titanium element is 1%-15%, and the molar ratio of the tin element is 75%-90%. The purpose is to provide the chlorine gas precipitation electrode which has the small use amount of the noble metal ruthenium and iridium, the low anode manufacturing cost, the large bonding force between metal oxides, long service life and high catalytic activity, can effectively reduce the anodic chlorine precipitation over potential, reduces electric energy consumption, and is very suitable for the chlorine gas precipitation electrode of the anode of a chlorine production electrolytic tank, and the preparation method thereof.

Description

technical field [0001] The invention relates to the field of sodium hydroxide preparation, in particular to a chlorine gas evolution electrode and a preparation method thereof. Background technique [0002] The titanium-based noble metal coating used in the chlorine gas evolution electrode in the traditional electrolysis device effectively reduces the anode chlorine evolution overpotential and reduces the operating energy consumption. However, it is necessary to consume expensive precious metals to make coatings, and the electrode cost is greatly affected by the price of precious metal raw materials. In recent years, the market demand for precious metals has continued to expand, and resource consumption has increased sharply, resulting in continuous rise in the price of precious metals, especially in the process of chlorine gas evolution. The noble metals Ru and Ir that are mainly used for catalysis lead to a sharp increase in the cost of electrode manufacturing, and there i...

AI Technical Summary

Problems solved by technology

The Ru, Ir, and Sn electrodes prepared in the De Nora CN200980144577.7 patent have an overpotential of 60mV for chlorine analysis at a low operating current density, and need to be modified by adding expensive platinum and palladium, which is not conducive to electrode cost control. Moreover, the binding force between Pt, Pd metal oxides and Ru, Ir, Sn metal oxides is not good, and the life of the anode is difficult to guarantee

[0005] In view of the problems of expensive multi-layer coatings and short service life of existing chlorine gas evolution anodes, it is necessary to research and manufacture chlorine gas evolution anodes that can not only ensure a good anode service life, but also effectively reduce the coating production cost and simplify the electrode manufacturing process.