A kind of preparation method and application of cobalt phosphate modified carbon fiber composite electrode material

Abstract

The invention belongs to the technical field of electrocatalytic materials, and in particular relates to a preparation method and application of a cobalt phosphate-modified carbon fiber composite electrode material. The material includes a three-dimensional conductive matrix and a catalytic active component cobalt phosphate compounded on the surface of the matrix; the two form an integrated electrode material without a binder. The invention adopts a two-step hydrothermal method. Firstly, layered cobalt hydroxide with carbon fiber as the base is obtained; secondly, hydrothermally converts cobalt phosphate into cobalt phosphate as a catalytic active component through in-situ anion exchange on the surface of cobalt hydroxide. The preparation method of the composite electrode is simple and easy to operate, and is environmentally friendly and conducive to industrial production. The composite electrode base material prepared by the invention is cheap, easy to process, has good electrical conductivity on the surface of cobalt phosphate, and high electrocatalytic activity, and the synergistic effect of the two improves the electrocatalytic performance of the composite electrode material, and is an ideal material with broad commercial application prospects. Electrocatalytic materials for oxygen evolution reaction.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic materials, and in particular relates to a preparation method and application of a cobalt phosphate-modified carbon fiber composite electrode material. Background technique [0002] Energy and environment are two major issues related to the survival and development of human society. The use of electrolyzed water can convert excess electrical energy into chemical energy for easy storage. It can not only make full use of clean energy and solve the problem of resource scarcity, but also provide large-scale utilization of hydrogen, thereby reducing the consumption of fossil energy and achieving the purpose of protecting the environment. However, during water electrolysis, the anodic oxygen evolution reaction (OER) involves four-electron transfer with slow reaction kinetics, resulting in high energy consumption. The basic method to improve the oxygen evolution efficiency of the anode is to app...

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Problems solved by technology

At present, there are two main methods for synthesizing powdered cobalt phosphate: one is the reaction of soluble cobalt salt and phosphate to form cobalt phosphate precipitation. Although this method is low in cost, the growth rate is too fast, easy to agglomerate and has high impurity content; the other is It is prepared by heating cobalt pyrophosphate hydrate and water to 250°C in a sealed tube. The disadvantages are low yield and high cost [Bai Zhenhui A preparation method of cobalt phosphate powder material [P]No.201410453227.1]

Moreover, in the traditional water electrolysis process, the powder material often needs to be fixed on the conductive substrate with a binder for oxygen evolution reaction. The use of the binder will inevitably introduce interfacial transmission resistance during processing, covering the active sites on the surface of the material. , affecting the catalytic performance of the material, which not only increases the difficulty of electrode preparation, but also seriously limits the actual production and application of oxygen evolution electrocatalysts.

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