Preparation method of fluffy porous nitrogen-doped oxygen reduction catalyst

Abstract

The invention discloses a preparation method of a fluffy porous nitrogen-doped oxygen reduction catalyst, belonging to the technical field of synthesis of porous carbon materials. According to the key point of the technical scheme of the invention, the preparation method comprises the following steps: putting a carbon source, a nitrogen source, zinc chloride and a pentahydrate basic magnesium carbonate into a glass mortar, grinding for 10-20 minutes until the materials are uniformly stirred so as to obtain a material A, transferring the material A into a ceramic boat, putting the ceramic boat into a tubular furnace, heating to 800-1000 DEG C under the protection of inert gas, standing for 120 minutes, and naturally cooling to the room temperature, so as to obtain a material B; and transferring the material B into a container, adding an acidic solution, soaking for 18 hours, washing with high-purity water until filtrate is neutral, and drying at 40-60 DEG C for 12-24 hours, so as to obtain the fluffy porous nitrogen-doped oxygen reduction catalyst. The specific surface area of the prepared fluffy porous nitrogen-doped oxygen reduction catalyst is 1346m<2> / g-1976m<2> / g, the hole diameter is about 3.8nm, and the fluffy porous nitrogen-doped oxygen reduction catalyst has excellent oxygen reduction catalytic performance and is capable of resisting methanol and carbon monoxide poisoning.

Description

technical field [0001] The invention belongs to the technical field of synthesis of porous carbon materials, and in particular relates to a preparation method of a fluffy porous nitrogen-doped carbon-oxygen reduction catalyst. Background technique [0002] Porous carbon material has become a typical fuel cell cathode oxygen reduction reaction catalyst due to its high specific surface area, rich pore structure and good electrical conductivity. Doping heteroatoms into carbon materials can effectively improve the surface structure of carbon materials, improve the surface wettability of carbon materials, and enhance the capacitance and catalytic properties of carbon materials (Peng, H.; Ma, G.; Sun, K.; et al. Electrochim. Acta 2016, 190, 862-871.). Nitrogen atoms doped into carbon materials exist in the following ways: pyridinic nitrogen, pyrrole nitrogen, graphite nitrogen and oxide nitrogen. The nature of the active sites for nitrogen-doped carbon materials to catalyze the ...

AI Technical Summary

Problems solved by technology

[0003] At present, the patent whose publication number is CN104258892A discloses a kind of SiO synthesized by sol-gel hydrothermal method 2 As a hard template, a hierarchical porous carbon block material is prepared by nano-casting method, and then a nitrogen source (urea, etc.) is added to prepare a nitrogen-doped mesoporous / macroporous hierarchical carbon-oxygen reduction catalyst. Although the specific surface area of ​​the nitrogen-doped carbon-oxygen reduction catalyst is as high as 1570-2480m 2 g -1 , with large pores connected in three dimensions, but this method is complicated and difficult to operate

The patent with the publication number CN105186010A discloses a method for preparing a solid-phase polymer using a eutectic salt as a template, and then preparing a nitrogen-doped carbon-oxygen reduction catalyst by high-temperature depyrolysis. The prepared nitrogen-doped carbon with a hierarchical porous structure Although the material has a rich pore structure, this method uses a large number of raw materials, high cost and complicated process

The patent with publication number CN103435034A discloses a method for synthesizing graphite-based oxygen reduction catalyst with ammonia water, sodium sulfide, sodium borohydride, hydroiodic acid, etc. to provide heteroatoms and as a reducing agent. The method has simple process and wide application range, but The performance of the prepared oxygen reduction catalyst is average, which cannot meet the requirements of production and life for oxygen reduction catalysts

Images