An electrolytic water catalyst with an unconventional local structure and its preparation method

Abstract

The invention relates to an electrolytic water catalyst with an unconventional local structure and a preparation method thereof; in the preparation method, the A-site element of the perovskite is selectively dissolved by using an ultrasonic-assisted ferric solution treatment method, and a small specific Surface-area perovskite crystalline oxides transform into nanostructured amorphous hydroxides with unusual localized electronic structures and geometries leading to ultrahigh oxygen evolution performance. The present invention takes into account the difference in pH of the elements at the A and B positions of the perovskite material, selects ferric iron with suitable acidity as a regulator, and uses the method of ultrasonic-assisted ferric iron solution treatment to selectively dissolve the elements at the A position, bringing More defects and larger specific surface area change the material structure and introduce new active sites, resulting in ultra-high OER activity, which can be applied to fuel cells, metal-air batteries, and water electrolysis.

Description

technical field [0001] The invention relates to an electrocatalyst with an unconventional local structure and a preparation method thereof, belonging to the field of synthesis of electrocatalytic materials. Background technique [0002] Energy and environmental issues are increasingly becoming the focus of attention. At present, countries that use fossil fuels such as coal and oil as their main fuels are already facing serious environmental pollution, coupled with the deepening dual crisis of limited reserves of fossil fuels, developing and utilizing clean and renewable energy, improving energy structure, and reducing greenhouse gases Emissions and protection of the environment on which human beings depend have become an important part of the world's energy sustainable development strategy. Electrolysis of water and photolysis of water can provide a steady stream of hydrogen, and hydrogen is considered to be a clean energy carrier for driving fuel cells and reducing carbon ...

AI Technical Summary

Problems solved by technology

Noble metal RuO 2 or IrO 2 It has good catalytic activity for oxygen evolution reaction (OER), but these noble metal catalysts cannot meet the requirements of large-scale applications due to high cost and low stability.

[0004] Perovskite materials have high intrinsic activity for OER, but their small specific surface area seriously hinders the practical application of perovskites as OER catalysts.

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