Preparation method of phosphorus doped cobalt molybdate hydrogen evolution electrocatalyst and product thereof

Abstract

The invention discloses a preparation method of a phosphorus doped cobalt molybdate hydrogen evolution electrocatalyst and a product, and belongs to the technical field of electro-catalysis hydrogen evolution. The method comprises the following steps: (1) separately adding cobalt chloride hexahydrate, ammonium molybdate tetrahydrate and urea in deionized water, and stirring to form a uniform mixedsolution; (2) transferring the solution prepared in step (1) in a reaction kettle, adding a conductive substrate, and carrying out hydrothermal reaction to obtain beta-phase cobalt molybdate precursor material; (3) placing a sample prepared in step (2) in a tube furnace, and carrying out high-temperature thermal treatment in a nitrogen atmosphere to obtain beta-phase cobalt molybdate; and (4) carrying out phosphating on the sample prepared in step (3) in a nitrogen atmosphere to obtain phosphorus doped cobalt molybdate, wherein a reagent for phosphating is sodium hypophosphite. According to the method, by control over the amount of the sodium hypophosphite and the pyrolysis time, phosphorus is successively blended in crystal lattices of cobalt molybdate, and the prepared catalyst has efficient hydrogen evolution capability in an alkaline solution.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic hydrogen evolution, and more specifically relates to a method for preparing a phosphorus-doped cobalt molybdate hydrogen evolution electrocatalyst and a product thereof. Background technique [0002] The ever-increasing demand for energy and the deteriorating natural environment make human beings urgently need a kind of energy containing energy that does not rely on fossil fuels and has abundant reserves. Hydrogen has a high energy density (140MJ kg -1 ), excellent combustion performance, clean and pollution-free, etc., it is considered as an ideal energy carrier. The electrolysis method uses water as a raw material and is a clean and efficient method for producing high-purity hydrogen on a large scale. However, the hydrogen produced by this method currently accounts for only 4% of the total hydrogen production. A core problem that restricts the large-scale application of this technolog...

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Problems solved by technology

Its weak hydrogen evolution catalytic activity is mainly caused by two reasons, one is the poor conductivity of transition metal oxides, and the other is the weak adsorption capacity of hydrogen atoms on the surface of transition metal oxides, so the intrinsic catalytic activity is very low. Low

Although people have developed various control methods to try to improve the hydrogen evolution performance of transition metal oxides, such as morphology changes, introduction of oxygen vacancies, lithium ion intercalation, etc., unfortunately, most of them ended in failure.

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