A carbon-supported noble metal nanoparticle composite material and its preparation method and application

Abstract

The invention discloses a carbon-loaded noble metal nanoparticle composite material and a preparation method thereof. The method comprises: (1) uniformly grinding a noble metal precursor salt and a carbon carrier to obtain a precursor mixture; and (2) sequentially adding an alkali and a reducing agent, continuously grinding, fully reacting to obtain a crude product, washing, and drying to obtain the carbon-loaded noble metal nanoparticle composite material. Compared with other methods, the method of the invention is low in cost, environmentally friendly, simple in process and clear in product.According to the invention, the obtained noble metal nanoparticles are small in particle size, uniform in size, highly dispersed, free of agglomeration and clean in surface; the method is suitable for large-scale production; and the water electrolysis hydrogen production performance of the obtained composite material is significantly superior to the the water electrolysis hydrogen production performance of other reported catalysts of the same type.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a composite material loaded with different carbon materials and a simple preparation method thereof. Background technique [0002] Among various heterogeneous catalysts, supported metal nanocatalysts have attracted great attention due to their intrinsic high activity and stability. The catalytic activity of supported metal nanocatalysts is closely related to the size and dispersion of metal nanoparticles. In general, reducing the size of metal nanoparticles can significantly increase their specific surface area, expose more surface active sites, and significantly modify their electronic and geometric structures, thereby greatly improving the performance of supported metal nanocatalysts. [0003] In order to obtain evenly dispersed small-sized metal nanocatalysts, liquid-phase synthesis is a common method. However, in the liquid phase synthesis proce...

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Problems solved by technology

However, in the liquid phase synthesis process, a large amount of solvents and surfactants need to be added to regulate the nucleation and growth of nanoparticles, so as to prevent the aggregation and growth of metal nanoparticles. The use of solvents and surfactants often causes large negative Effects, such as tightly attached to the surface of metal nanoparticles, difficult to remove, limiting the effective expression of its catalytic activity, resulting in a reduction in catalyst activity

High-temperature solid-phase synthesis is also a common method for preparing metal nanocatalysts. However, although this method can avoid the use of solvents and surfactants, it is difficult to control the size, dispersion and loading of metal nanoparticles.

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