Device for electrochemically preparing hydrogen peroxide with zero gap between electrode and diaphragm and its application method

Abstract

The invention provides a device for electrochemically preparing hydrogen peroxide with zero distance between an electrode and a diaphragm and a use method thereof. The device contains an anode chamber and a cathode chamber, wherein the anode and cathode are separated by a cation exchange membrane. Both the anode and the cathode use a gas diffusion electrode similar to a hydrogen fuel cell. One side of the gas diffusion electrode of the anode contains a platinum or platinum-ruthenium alloy catalyst, and this side is directly bonded to the cation exchange membrane. The surface of one side of the gas diffusion electrode of the cathode contains a carbon powder catalyst, and this side is directly attached to the cation exchange membrane. The other side of the cathode is connected with a conductive hydrophilic porous medium with a certain thickness and a certain porosity engraved with a gas flow field. The mass transfer rate of reaction gas of the device is high, the mass transfer effect is stable, and the performance of the reactor is high. The method of use is as follows: hydrogen is passed into the anode, oxygen or air is passed into the cathode; an external power supply is connected between the anode and the cathode, and the hydrogen peroxide generated by electroreduction at the cathode is absorbed and transferred by the hydrophilic porous medium.

Description

technical field [0001] The invention relates to the preparation of hydrogen peroxide, in particular to an electrochemical hydrogen peroxide preparation device with zero gap between an electrode and a diaphragm and a method for using the same. Background technique [0002] Hydrogen peroxide is an effective oxidizing agent and is widely used in industrial processes. As a disinfectant, it is also used in pulp and paper bleaching, detergents, wastewater treatment, chemical synthesis, textile industry, etc. Hydrogen peroxide is produced on a large scale mainly by the anthraquinone method, a chemical method in which hydrogen is first reduced and then oxidized with oxygen. As alternative technologies, electrolyzer-type methods and fuel cell methods are also used in some cases to produce hydrogen peroxide. These two methods require higher energy consumption or hydrogen consumption, and because hydrogen peroxide will be decomposed into water during the preparation process, or furth...

AI Technical Summary

Problems solved by technology

This device has the following disadvantages: the first is that a liquid chamber is arranged between the electrode and the cation exchange membrane, so its internal resistance is relatively large, and the internal resistance is affected by the conductivity of the solution in the liquid chamber, and its fluctuation is large, which is not conducive to control; The gas diffusion electrode is a porous electrode, and the liquid in the liquid chamber will fill into the pores of the gas diffusion electrode, so that the mass transfer resistance of the reactant gas entering the catalyst surface in the electrode increases; in addition, as the electrolyte in the cathode and anode cavity is consumed , the electrolyte in the liquid chamber also needs to be replaced to maintain its conductivity

This method is also based on soaking the electrode in solution, and the oxygen reduction is carried out in the liquid phase, and the mass transfer of oxygen is slow.

Images