Composite material of hollow carbon material loaded with Co-Cu-B nanoparticles and preparation method and application thereof

Abstract

The invention discloses a hollow carbon material loaded Co-Cu-B nanoparticle composite material, which is characterized in that a polypyrrole material is prepared by a one-pot method, and then Co-Cu-B is loaded on a hollow carbon material by a chemical in-situ reduction method to obtain a Co-Cu-B nanoparticle hollow carbon material, the specific surface area of the Co-Cu-B nanoparticle hollow carbon material is 40-50 m < 2 > g <-1 >, and the pore size distribution of the Co-Cu-B nanoparticle hollow carbon material is 3-4 nm. The preparation method comprises the following steps: 1, preparing the hollow carbon material carrier; and 2, preparation of the Co-Cu-B nanoparticles loaded on the hollow carbon material. When the catalyst is used as a sodium borohydride hydrolysis catalyst, the maximum hydrogen desorption rate reaches 2759.96 mLmin <-1 > g <-1 > under the condition of 303 K; the hydrogen desorption amount is 96% of a theoretical value; the activation energy Ea is equal to 23.95 kJmol <-1 >; after five cycles, the sodium borohydride is hydrolyzed to be 85.7% of the initial catalytic activity. The catalyst has excellent catalytic performance and cycling stability, and has a wide application prospect in the fields of hydrogen production materials, fuel cells and the like.

Description

technical field [0001] The invention relates to the technical field of catalytic chemistry, in particular to a hollow carbon material loaded Co-Cu-B nano particle composite material and its preparation method and application. Background technique [0002] As a non-toxic, non-polluting clean energy, hydrogen energy is an important way to solve the problem of non-renewable energy such as fossil energy. In the method of hydrogen production, hydrogen production by hydrolysis of sodium borohydride has the following advantages: (1) High hydrogen storage capacity, NaBH 4 The theoretical hydrogen storage mass fraction is 10.8%; (2) High security, NaBH 4 The solution is non-flammable, it can exist stably for several months under alkaline conditions, and it is easy to transport; (3) Sodium borohydride is an exothermic reaction, which can produce H without energy input 2 ; (4) The purity of hydrogen is high, and the gas flow produced by the reaction is relatively pure, with only H ...

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Problems solved by technology

GO has high specific surface area, excellent chemical resistance and special electron transport properties, and the presence of abundant oxygen-containing functional groups on its surface makes PdAg particles easy to anchor and disperse, improving the performance of catalytic sodium borohydride hydrogen production, PdAg / rGO Catalyzed NaBH 4 The activation energy of dehydrogenation is 20.7 kJ·mol -1 , during the test of the cycle performance, a significant loss of activity was observed in the third catalytic process, which may be attributed to the aggregation of rGO during the reaction process, and the catalyst was also lost during the recycling process.

Moreover, the preparation process of rGO is complex and difficult to synthesize

[0007] According to the applicant's research on the literature, although polypyrrole has the characteristics of low cost and easy synthesis, according to the current research on polypyrrole in the battery field, such as the existing literature 4 (Gongyu Wen, Yulei Sui, Xiaoping Zhang. Mn3O4 anchored polypyrrole nanotubes as an efficient sulfur host[J].Journal of Colloid and Interface Science, 2021, 208-216. ), indicating that it has the following significant technical problems: excessive volume change during charge and discharge, resulting in poor cycle stability, reaction kinetics slow feature

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