Oxygen evolution catalyst with low noble metal loading amount for water electrolysis unit

Abstract

The invention discloses an oxygen evolution catalyst with a low noble metal loading amount for a water electrolysis unit. According to the oxygen evolution catalyst with the low noble metal loading amount for the water electrolysis unit, the catalyst is an iridium and titanium composite catalyst and is composed of powder titanium and iridium oxide loaded on the surface of the powder iridium; and the mass percent of the iridium oxide is 5 to 30 percent. According to the catalyst provided by the invention, on one hand, metal titanium powder with high metal conductivity is used as a carrier of the catalyst and the electron conductivity of the catalyst is strengthened; on the other and, the iridium and the carrier titanium are tightly combined, a bonding force between the iridium oxide and thecarrier is improved and the electron transfer rate between an active center and the carrier is improved, so that the activity of the catalyst reaches 3 times or more 3 times of that of commercial iridium oxide; and meanwhile, the dosage of the noble metal iridium can be greatly reduced and the mass ratio of the iridium can be reduced to 5 to 30 percent.

Description

technical field [0001] The invention belongs to the field of water electrolysis, in particular to an oxygen evolution catalyst with low noble metal loading used in a water electrolyzer. Background technique [0002] A water electrolyzer is a device that can convert electrical energy into chemical energy, and it is widely used in energy storage of renewable energy power systems and distributed hydrogen production devices. Current water electrolysis systems such as proton exchange membrane water electrolyzers still face the problem of high cost, so further cost reduction is needed to promote the commercialization of this technology. Membrane electrodes are the core components of water electrolyzers, which consist of anode and cathode noble metal catalysts and polymer electrolyte membranes. The catalysts currently used in proton exchange membrane water electrolyzers are all noble metal catalysts, and the amount of noble metals in the membrane electrodes is very high, resulting...

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Problems solved by technology

Among them, transition metal oxides are often used as carriers, but such oxides are semiconductors or insulators and thus have poor electronic conductivity. In order to enhance the activity of the catalyst, the loading of iridium oxide must be greatly improved to pass the high loading (mass Fraction greater than 60%) iridium oxide to make up for the shortcomings of the lack of electronic conductivity of the carrier material, so this type of technology can not greatly reduce the content of noble metals in the catalyst, the cost of the catalyst and the prepared membrane electrode is still high, urgently need to develop lower Catalysts loaded with precious metals to solve the problems in the prior art

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