Carbon-Supported Ferric Carbide-Tungsten Carbide Composite Catalyst

It was found that tungsten-based transition metal catalysts have excellent platinum substitution function. However, the agglomeration of nanoparticles and the existence of low density active centers in the synthesis process still puzzle the synthesis of such materials.

The study also found that the hydrogen evolution electrocatalyst should have better electron transporting ability, and the carbon material with large specific surface area and porous structure is beneficial to the transport of electrolyte and the transfer of electrons. In particular, heteroatom-doped porous carbon materials are often selected as electrode materials or carriers for loading transition metal nitrides or carbides. Therefore, the development of new synthetic methods or the development of new materials is of great significance for the storage and transformation of electrochemical energy.

In order to obtain efficient and inexpensive non-precious metal electrocatalysts, researchers have developed a carbon-supported iron carbide-tungsten carbide composite catalyst. The preparation process of this catalyst is as follows:

Preparation of POMsMIL-100 (Fe): using 3.2 g of phosphotungstic acid and 1.89 g of ferric chloride hexahydrate dissolved in 50 mL of distilled water, adding 1.36 g of trimethyl 1,3,5-benzenetrihydroxy acid ester, at 130 The reaction was carried out at °C for 72 h, and the obtained product was separated by centrifugation, and washed with ethanol and diethyl ether, respectively.

Preparation of heteroatom-doped carbon-supported iron carbide/tungsten carbide: mixing and grinding POMsMIL-100 (Fe) with melamine (1:3); heat treatment at 900 °C for 3 to 5 hours under high purity nitrogen, cooling, pickling , to get the final desired sample.

Among them, POMsMIL-100 (Fe) is used as the precursor. On the one hand, POMsMIL-100 (Fe) has the characteristics of large specific surface area and porosity, which is beneficial to the formation of porous carbon materials. At the same time, transition metal atoms can be introduced to form porous carbon materials. A small-sized, uniformly dispersed transition metal-based catalyst is supported; on the other hand, grinding and calcining (carbonizing) POMsMIL-100 (Fe) with melamine can increase the degree of graphitization of the obtained carbon material, thereby improving its electron transporting ability. Moreover, the metal atom can exert its catalytic ability, and finally a carbon material having a high morphology, a unique structure, a high degree of graphitization and a strong electrical conductivity is obtained, and the hydrogen production performance of the electrolyzed water is better, the process is easy to control, and the preparation cost is low.

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