A large-area method for preparing self-supporting high-performance oxygen evolution electrodes at room temperature

Abstract

The invention discloses a method of large-area preparation of a self-supporting high-performance oxygen evolution electrode at the room temperature, and belongs to the field of electrolyzed water catalysis and oxygen evolution. The method comprises the steps that a layer of alkaline oxide is arranged on a conductive substrate in a loading mode, the conductive substrate and the layer of alkaline oxide are soaked in a transition metal mixed salt solution, a reaction is conducted for a period of time at the room temperature, finally ultra-thin sheet-shaped transition mono-metal and multi-metal hydroxide perpendicularly grows on the conductive substrate in an oriented mode, and then the self-supporting high-performance oxygen evolution electrode is obtained. The method is not limited by substrate materials, and large-area growth can be achieved; the method is conducted at the room temperature, and the energy cost is saved; the method has the universality and can achieve perpendicular and oriented growth of most of two-dimensional sheet-shaped transition mono-metal and multi-metal hydroxide; and part of electrodes prepared according to the method have the quite high electro-catalysis oxygen evolution activity, are much superior to commercial RuO2 catalytic agents, and can be applied to the fields of industrial water electrolysis, metal-air cells and fuel cells.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a method for preparing a self-supporting high-performance oxygen evolution electrode in a large area at room temperature. Background technique [0002] In recent years, electrocatalytic water splitting reactions for renewable energy storage have attracted much attention. Compared with the two-electron process of hydrogen production, the electrocatalytic water splitting oxygen production reaction (OER), as a four-electron reaction, is a kinetically lagging step in the entire catalytic reaction. Not only that, but the process is key to energy conversion and storage technologies such as recyclable metal-air batteries. However, the most excellent electrocatalysts for traditional water electrolysis are mainly noble metals such as platinum, gold, ruthenium, and the like. In view of the high cost, people continue to explore new efficient and low-cost electrocatalytic oxy...

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Problems solved by technology

The seed growth method needs to prepare a pure phase hydroxide layer, and the growth conditions are not easy to control

In order to obtain a better lamellar structure, the hydrothermal method often needs to add surfactants (such as hexamethyltetrammine, HMT), and is limited by the reaction equipment, and cannot achieve large-area growth; although the electrodeposition method can obtain good two-dimensional materials, It is only suitable for growth on conductive substrates, and the process requires a lot of energy and waste liquid. The complex process and cost requirements make it difficult to be widely used

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