With the discovery of the biological effects of hydrogen on the human body, there is a black-tech hydrogen production method, which is the hydrogen production principle of hydrogen respirator, hydrogen-hydrogen spray beauty instrument, and the third-generation hydrogen-rich water cup. In addition, from the principle of hydrogen production, you can tell which brand of hydrogen water cup is good, and at the same time, combined with the ordinary electrolysis of the second-generation hydrogen water cup, you will also know whether it is possible that there is a “drinking problem with the hydrogen water cup”. We know that the fuel cell can continuously generate electricity by continuously supplying hydrogen and oxygen on both sides. Can the reverse process of the fuel cell continue to produce high-purity hydrogen and oxygen through the SPE proton membrane? The answer is yes, now Submarines, spacecraft, etc. that require high-purity hydrogen and oxygen generally use this method.
Structure of SPE Proton Membrane for Hydrogen-rich Hydrogen Machine
The most commonly used SPE proton membranes are perfluorosulfonic acid proton exchange membranes. SPE is the abbreviation of “solid polymer electrolyte” in English, which is literally translated as solid polymer electrolyte water electrolysis oxygen production technology, also known as proton exchange membrane electrolysis water oxygen production technology or ion exchange membrane electrolysis water oxygen production technology, sometimes referred to as SPE electrolysis Water oxygen technology. The SPE technology replaces the original alkaline electrolyte with a solid polymer electrolyte called a proton exchange membrane, and the electrocatalyst particles are directly attached to the membrane to form a membrane-electrode group.
Hydrogen-rich Hydrogen Machine SPE Proton Membrane Hydrogen Production Principle
A membrane that allows only water and protons (or hydrated protons, H3O+) to pass through. The principle is simply that: hydrated protons combine with sulfonic acid groups in the proton exchange membrane, and then from one sulfonic acid group to another sulfonic acid group, and finally to the other side. . H ions are protons, in fact, protons can combine with trace water molecules H3O+, saturating the proton membrane.
Below the SPE proton membrane is the anode, which produces an electrolysis reaction with water: 2 H2O→4H++4e+ O2 It can be seen that at the anode, 2 water molecules are electrolyzed into 4 hydrogen ions, an oxygen molecule and 4 electrons, and the electrons cannot penetrate The proton-permeable membrane can only flow through an external circuit.
Four protons combine with cathode electrons through the proton membrane to generate two hydrogen atoms: 4H++4e→ 2H2
Main advantages of SPE proton membrane for hydrogen production
- High efficiency at a given current density, thus low energy consumption and low cost.
- Higher current density. The current density can reach up to 3A/cm2, and the cell voltage is 2.0V. The general current density is 1A/cm2, and the cell voltage is 1.9-2.0V, so under the same gas production, the volume is small and the weight is light.
- Since the electrolyte is a chain polymer with stable performance and no corrosive liquid, it is safe and reliable, with small maintenance and long service life. According to reports, the SPE electrolyzers used by the Royal Navy have been running for 150,000 hours, and it is also reported that the service life of SPE electrolyzers is more than 20 years.
- The electrolyte is a non-breathable diaphragm, which can withstand a large pressure difference, thereby simplifying the control of the pressure difference, and starting and stopping quickly. Due to the solid polymer electrolyte used in the SPE electrolytic cell, it only has a one-way conduction effect on hydrogen ions, which fundamentally avoids the mixing of hydrogen and oxygen through the diaphragm, with good safety and high gas purity (hydrogen purity> 99.99%, oxygen purity> 99.99% ).
Compared with the traditional alkaline water electrolysis hydrogen production, SPE water electrolysis has the advantages of high efficiency, low energy consumption, stable electrolyte, safety and reliability, as well as small size, light weight and long life of the device.
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