Nitrogen-doped carbon nanotube/carbon composite oxygen reduction catalyst and preparation method thereof

Abstract

The invention provides a nitrogen-doped carbon nanotube / carbon composite oxygen reduction catalyst and a preparation method thereof. The catalyst firstly adds melamine (MAM) into carbon nanotubes (CNTs), and prepares melamine through a non-covalent bond modification method. modified carbon nanotubes (CNT‑MAM), and then in situ polymerized them with melamine and aldehyde-containing compounds in dimethyl sulfoxide (DMSO) to synthesize carbon nanotubes / poly(melamine‑aldehyde) composites, and then A nitrogen-doped carbon nanotube / carbon composite catalyst is prepared by pyrolyzing the composite at high temperature. The nitrogen-doped carbon nanotube / carbon composite oxygen reduction catalyst provided by the invention has high specific surface area and nitrogen content, excellent oxygen reduction catalytic activity, methanol resistance performance and stability.

Description

technical field [0001] The invention relates to a nitrogen-doped carbon nanotube / carbon composite oxygen reduction catalyst and a preparation method thereof, belonging to the field of fuel cell science and technology. Background technique [0002] Due to its unique structure and synergistic effect between different materials, nitrogen-doped carbon nanocomposites can further improve the catalytic activity of oxygen reduction reaction (ORR) compared with single nitrogen-doped carbon materials, and are ideal for fuel cell cathodes. Contains metal-free catalysts. CNTs themselves have excellent properties, and many researchers compound them with polymers to prepare CNTs / polymer composites with desired properties. CNTs have small diameter and large surface energy, and are easy to attract each other to form larger aggregates. In order to make CNTs uniformly dispersed in composite materials, it is necessary to modify CNTs before polymerization. The non-covalent modification will n...

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Problems solved by technology

The methods for synthesizing nitrogen-doped carbon nanocomposites often include chemical vapor deposition (CVD), hydrothermal synthesis, solution self-assembly, and high-temperature post-treatment of nitrogen-containing organic precursors. The requirements are relatively high. The solution self-assembly method is a method of assembling and constructing structures without relying on manpower, and the controllability is poor.

Although the CVD method can well regulate the morphology of composite materials, the reaction conditions are relatively harsh and the operation is complicated, which is not conducive to large-scale production of this method; the method of high-temperature post-treatment of nitrogen-containing organic precursors is the simplest, and the obtained nitrogen-doped carbon nano The ORR activity of tube composites is also high, which is a good way to prepare high-efficiency ORR electrocatalysts.

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