Preparation method of hydrogen evolution electrocatalyst based on PD-enhanced metal-organic framework materials

Abstract

The invention discloses a preparation method for a Pd-enhanced metal-organic framework (MOFs) compound used as a hydrogen evolution electrocatalyst, which includes the following steps: (1) zinc nitrate hydrate and 2-aminoterephthalic acid are dissolved into a N,N-dimethylformamide (DMF) solution; (2) ultrasonic operation is carried out on the mixed solution; (3) the mixed solution is poured into a Teflon reaction kettle to carry out hydrothermal reaction; (4) after reaction, centrifugal operation is carried out on the mixed solution; (5) after a centrifugal product is put into an oven and dried, an MOFs material is obtained; (6) the MOFs powder is added into a certain amount of palladium chloride (PdCl2) solution, an excessive sodium borohydride (NaBH4) solution is then added in, the mixture is kept for 1 hour after mixing until the mixture reacts completely, and thereby a Pd / MOFs mixed solution is prepared; (7) after reaction, centrifugal operation is carried out on the mixed solution; (8) after the centrifugal product is put into the oven and dried, the Pd / MOFs hydrogen evolution catalyst is obtained. The Pd / MOFs hydrogen evolution catalyst prepared by the invention has good electrochemical activity and stability, and not only can increase the efficiency of hydrogen evolution reaction, but also can greatly prolong the cycle life.

Description

technical field [0001] The invention relates to a preparation method of a Pd-enhanced metal-organic framework material (MOFs) hydrogen evolution electrocatalyst, in particular to a preparation method of a Pd / MOFs hydrogen evolution catalyst. Background technique [0002] Hydrogen energy is the cleanest fuel with the most reserves, which can be recycled and has potential. It is emerging as a low-carbon and zero-pollution energy source. It is also very well applied in electronic equipment, household appliances, etc., and has a good development prospect in the future. There are many methods for industrial hydrogen production, such as hydrocarbon steam reforming, coal gasification, ammonia cracking, water splitting, biological hydrogen, etc. Among them, hydrogen production by electrolysis of water has the advantages of simple operation, no pollution, electrolysis efficiency as high as 80%, and high product purity, which makes it applied and developed. However, commercial hydro...

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Problems solved by technology

Precious metals such as platinum, palladium, and gold are usually used as hydrogen evolution catalysts for laboratory use. Due to the high economic value of such metals and the small reserves on the earth, their commercial development is limited.

We have found metal-free catalyst MOFs, which have large specific surface area and good pore size. These properties bring prospects to the hydrogen evolution industry, but its low activity and poor conductivity limit its application.

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