Why do platinum electrodes perform best in water electrolysis?
Gmail:alisa@jmyunti.com
Using platinum as the cathode for water electrolysis will reduce the cathode hydrogen evolution overpotential, making the cathode electrochemical reaction easier to proceed. Basic principle: The cathode reaction is divided into two processes:
1. Water or hydrogen ions are first reduced to produce intermediate hydrogen atoms. This step is the key to determining the difficulty of the reaction.
2. Hydrogen atoms are combined to form hydrogen molecules, that is, hydrogen gas. The platinum electrode has a good adsorption effect on the intermediate hydrogen atoms, reducing the activity of hydrogen atoms, thereby promoting the reaction. If certain processes such as electroplating black platinum are used to roughen the electrode surface to form a frosted or porous state, the electrocatalytic performance will be better.
Pt is a good catalyst for the hydrogen evolution reaction (HER) in water electrolysis. Platinum is the king of catalysts, and platinum has the highest activity in catalyzing many reactions.
Titanium-plated platinum electrodes are used in hydrogen-rich water cups. For example, many hydrogen-rich water cups on the market in recent years are platinum-plated on titanium substrates. Hydrogen and oxygen are separated through electrolysis and SPE technology. The electrolyzed water enters the anode chamber of the electrolytic cell. After power is turned on, the water immediately decomposes into four positively charged H and two -2-valent oxygen. The decomposed negative oxygen ions immediately release electrons at the anode to form oxygen, which is discharged from the anode and carries some water. Hydrogen, in the form of hydrated ions, passes through the ion membrane under the action of the electric field force, reaches the cathode to absorb electrons to form hydrogen, and the hydrogen is discharged from the cathode chamber and enters the water to form hydrogen-rich water.
Hydrogen-rich water cup/machine accessories platinum titanium anode parameters:
Substrate material: GR1 titanium
Electrode column: GR1 titanium
Electrode column connection method: touch welding, spot welding or screw fixing
Coating process: high temperature sintering
Coating composition: platinum Pt
Precious metal coating amount: 0.25-5 μm
Ambient temperature: ≤ 65℃
Ambient pH value: 2-12
Working current density: ≤ 2000A/m2
Oxygen evolution potential: ≥1.9V
Coating characteristics: platinum and titanium substrate are firmly combined, stable performance, high output current density, low loss, long life
Platinum coatings can also withstand high temperatures
The melting point of platinum is as high as 1772 ° C and the boiling point is about 3827 ° C plus or minus 100 ° C. Coatings made of platinum have high chemical stability and are not easily oxidized at a given high temperature
Company: Baoji Dynamic Trading Co., Ltd
Country:China
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Gmail:alisa@jmyunti.com
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