Oxygen-permeable membrane and hydrogen-permeable membrane alternately decompose water to produce hydrogen

Abstract

The invention provides a device for alternately decomposing water to make hydrogen by oxygen permeating membranes and hydrogen permeating membranes. The device comprises a flat box body and inner pipelines, wherein the internal part of the flat box body is divided into a plurality of oxygen permeating chambers and hydrogen permeating chambers which are arranged at intervals; the inner pipelines extend inside all the oxygen permeating chamber and hydrogen permeating chamber; the inner pipelines of the adjacent chambers are connected with each other end to end through an outer pipeline; the inner pipelines and the outer pipeline form communicated serpentine steam channel; the inner pipelines in the oxygen permeating chambers are made of the oxygen permeating membranes; the inner pipelines in the hydrogen permeating chambers are made of the hydrogen permeating membranes; chemical potential difference exists between the inner and outer sides of the hydrogen permeating membranes of the inner pipelines in the hydrogen permeating chambers and chemical potential difference also exists between the inner and outer sides of the oxygen permeating membranes of the inner pipelines in the oxygen permeating chambers; and oxygen and hydrogen respectively enter the regions between the inner pipelines and the inner walls of the corresponding chambers through the oxygen permeating membranes and the hydrogen permeating membranes under the action of the chemical potential differences. According to the device, the steam channel is formed by alternate connection of the inner pipelines of the oxygen permeating membranes and the hydrogen permeating membranes, and the water vapor decomposition rate is much higher than that the situation of use of only oxygen permeating membranes or hydrogen permeating membranes.

Description

technical field [0001] The invention relates to the technical field of new energy, in particular to a device for alternately decomposing water by an oxygen-permeable membrane and a hydrogen-permeable membrane to produce hydrogen. Background technique [0002] With the intensification of traditional energy consumption, renewable energy has increasingly attracted the attention of countries all over the world. Hydrogen is an energy source with high energy density, and it can be produced by decomposing water, which is extremely abundant on the earth. Therefore, hydrogen as a renewable energy has increasingly become a research hotspot. Compared with traditional hydrogen production by electrolysis of water and catalytic hydrogen production from chemical raw materials, hydrogen production by pyrolysis of water through membrane materials can use nuclear energy, industrial waste heat or new energy such as solar energy as energy sources, reducing the use of electric energy and fossil ...

AI Technical Summary

Problems solved by technology

However, in this method, the hydrogen concentration in the oxygen-permeable membrane tube is too high, or the oxygen concentration in the hydrogen-permeable membrane is too high, both of which will inhibit the further decomposition of water, thereby reducing the conversion rate of water

Moreover, too high hydrogen concentration may cause damage to the structure of oxygen permeable membranes (especially perovskite oxygen permeable membranes), and too high oxygen concentration may cause oxidative damage to hydrogen permeable membranes.

These factors work together, resulting in limited water pyrolysis capacity, low hydrogen production efficiency, and low conversion efficiency of the system from thermal energy to chemical energy in the prior art devices for splitting water to produce hydrogen.

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