A nanotube-shaped cobalt/cobalt tetroxide-based composite catalyst for electrocatalytic hydrogen evolution and its preparation method and application

Abstract

The invention relates to a nanotube cobalt / cobaltosic oxide-based composite catalyst for electrocatalytic hydrogen evolution and a preparation method and application thereof, wherein the composite catalyst is obtained by taking nanotube cobalt / cobaltosic oxide as a substrate and then loading cobalt molybdate. In the preparation method, a cobalt sheet is used as the only cobalt source of the tubular cobaltosic oxide, so that the influence of other salt ions on the product is avoided; by utilizing a simple anodic oxidation technology, severe reaction conditions such as high temperature and highpressure are avoided, the energy consumption is reduced, and the reaction time is shortened; the regular nanotube array is prepared, the contact area is increased to a great extent due to the tubularmorphology, and meanwhile, the characteristics of hydrophilicity, air repellency and the like of the composite catalyst are more beneficial to hydrogen precipitation.

Description

technical field [0001] The invention belongs to the field of electrocatalytic hydrogen evolution materials, and in particular relates to a nanotube-shaped cobalt / cobalt tetroxide based composite catalyst for electrocatalytic hydrogen evolution and its preparation method and application. Background technique [0002] With the continuous progress of human society, fossil fuels are overused, environmental pollution is becoming more and more serious, and human living conditions are deteriorating. Research and development of new energy sources has become one of the most important issues at present. Hydrogen energy is known as one of the most promising new energy sources in the 21st century due to its advantages of high combustion calorific value, no greenhouse gas emissions, and the combustion products and preparation raw materials are all water. Generally, high-purity hydrogen can be produced by electrolysis of water. However, the current catalysts used for electrocatalytic hy...

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Problems solved by technology

However, the template method or high-temperature synthesis method was usually used to prepare cobalt tetraoxide nanotubes before. These methods have complicated preparation procedures, cumbersome chemical processes, high energy consumption, long time-consuming and easy residues of impurities.

[0003] On the one hand, the purpose of the present invention is to solve the technical problems of complex preparation methods of tubular cobalt trioxide-based catalytic materials faced by the prior art and large energy consumption. The present invention provides a simple technology for preparing nano-tubular cobalt trioxide The energy consumption in the preparation process is simplified and the electrochemical performance is improved at the same time. This method uses cobalt flakes under the joint action of fluoride ions and external voltage to make the growth and dissolution of the oxide layer reach a dynamic balance, and nanotube-shaped cobalt / cobalt tetroxide can be obtained. base

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