Molybdenum carbide nanorod for catalyst and preparation method and application thereof

Abstract

The invention provides a molybdenum carbide nanorod for a catalyst and a preparation method and application of the molybdenum carbide nanorod. The preparation method disclosed by the invention comprises the following steps of: dispersing molybdenum trioxide and hypoxanthine in deionized water to obtain a dispersion liquid, carrying out a hydrothermal reaction on the obtained dispersion liquid, naturally cooling the obtained dispersion liquid to room temperature after the reaction is finished, successively conducting centrifuging, washing and drying to obtain a precursor nanorod, calcining theprecursor nanorod under inert gas, and conducting natural cooling to room temperature to obtain the molybdenum carbide nanorod. The molybdenum carbide nanorod prepared by the invention shows excellenthydrogen evolution reaction catalytic performance in an alkaline medium, and has relatively small overpotential and Tafel slope. The method has the advantages of simple preparation process, low cost,no use of reagents with strong toxicity and great harm to the environment, no pollution to the environment, greenness, environmental protection, suitableness for industrial production, and very goodlarge-scale commercial preparation and application prospect.

Description

technical field [0001] The invention relates to a molybdenum carbide nanorod for a catalyst, a preparation method and application thereof, and belongs to the technical field of nano-catalysis materials. Background technique [0002] Hydrogen energy is a renewable energy with high energy density and no pollution, and has great application potential in fuel cells as an efficient energy source. So far, hydrogen production by electrolysis of water is the most ideal way to produce hydrogen, and the efficiency of hydrogen production by electrolysis of water depends largely on the hydrogen evolution reaction catalyst used. At present, platinum-based catalysts are the most effective catalysts for hydrogen evolution reaction, but the large-scale practical application of such catalysts is greatly limited due to their high price and rarity. Therefore, it is of great significance to develop low-cost, high-efficiency hydrogen evolution catalysts. [0003] As the main component of trans...

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Problems solved by technology

For example: Chinese patent document CN109126844A provides a molybdenum carbide nanosheet and its preparation method and application. The method is to mix the molybdenum source, ammonium nitrate, and glycine evenly, and then heat it to 160-180°C to obtain the mixture, add glucose, Heating to 230-280°C to obtain a fluffy solid, heating to 450-550°C in a hydrogen atmosphere, and cooling to obtain molybdenum carbide nanosheets, but this method is more complicated, requires more raw materials, and uses hydrogen for reduction, so the safety of the experimental operation is poor

Chinese patent document CN110422846A provides a method for synthesizing molybdenum carbide nanomaterials, including the following steps: arrange the cleaned carbon on the top of molybdenum trioxide powder, then place it in a chemical vapor deposition device, heat the reaction in an inert gas atmosphere, and cool down A carbon cloth with a porous molybdenum carbide nanostructure is obtained, but the deposition efficiency of this method is relatively low, and it is not suitable for industrial production

However, this method uses a carbon-containing gas, which tends to accumulate carbon on the surface of molybdenum carbide during the growth process, covering the active sites and reducing the catalytic efficiency, and involves gas-solid multiphase reactions, resulting in longitudinal differences in the synthesized catalysts.

[0004] Currently, the controllable synthesis of nanomolybdenum carbides remains highly challenging due to the lack of suitable carbon precursors and molybdenum interactions to form uniform nanostructures.

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