Nitrogen-doped carbon nanotube oxygen-reduction electrocatalyst and preparation method thereof

Abstract

The invention relates to a nitrogen-doped carbon nanotube oxygen-reduction electrocatalyst and a preparation method thereof. The preparation method comprises the steps of growing a bimetal zeolite imidazate framework structure material (ZIF) on sheet-shaped graphite-phase carbon nitride (g-C3N4) in an in-situ way, and then performing high-temperature thermal processing, wherein g-C3N4 is obtainedby pyrolysis of a low-cost biologic material. The electrocatalyst is a porous nitrogen-doped carbon nanotube material wrapped with transition metal or a compound thereof. The preparation method is simple in process and low in cost, the low-cost biological material is introduced and is calculated at a low temperature to generate the g-C3N4 material, the bimetal ZIF material is carried, and the effective nitrogen-doped carbon nanotube electrocatalyst is obtained by high-temperature pyrolysis. The prepared nitrogen-doped carbon nanotube oxygen-reduction catalyst has a large amount of mesopores and high specific area, shows high catalytic activity on oxygen-reduction reaction and can be used as a negative catalyst widely applied to the field of a fuel cell and a metal-air battery.

Description

technical field [0001] The invention relates to an oxygen reduction electrocatalyst, in particular to a nitrogen-doped carbon nanotube oxygen reduction electrocatalyst and a preparation method thereof. Background technique [0002] At present, traditional energy consumption is serious, and the development and utilization of new energy sources such as solar energy, wind energy, and hydrogen energy, and the development of new energy vehicles for energy conservation and emission reduction are becoming increasingly important. Fuel cells and metal-air batteries have the advantages of cleanliness, high efficiency, high power density, and low-temperature fast start-up, and are widely used in vehicle power supplies, distributed power generation, and new energy storage. However, the performance of fuel cells and metal-air batteries is severely limited by the slow reaction kinetics at the cathode. At present, the best catalyst for the cathode oxygen reduction reaction (ORR) is still ...

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Problems solved by technology

[0003] Nitrogen-doped carbon materials (such as carbon nanotubes, graphene, etc.) are the ORR non-noble metal catalysts that are most likely to replace Pt, but non-noble metal catalysts often use relatively expensive macrocyclic compounds to introduce nitrogen, which makes the catalyst preparation cost Still relatively high; at the same time, carbon nanotubes often need to be prepared using expensive vapor deposition equipment, and the process is complicated

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