Preparation method of transition metal-nitrogen-carbon nanotube co-doped activated carbon oxygen reduction catalyst

Abstract

The invention relates to a preparation method of a transition metal-nitrogen-carbon nanotube co-doped activated carbon oxygen reduction catalyst, and belongs to the field of catalyst preparation. Themethod comprises the following steps: pretreating an activated carbon carrier, growing a metal organic framework compound on the activated carbon in situ, and carrying out high-temperature pyrolysis carbonization. The method for in-situ growth of the metal organic framework compound on the activated carbon comprises the following steps: dissolving transition metal salt and zincate in a solvent toform a solution A; dissolving a nitrogen-containing organic ligand in a solvent to form a solution B; adding the pretreated activated carbon into the solution B to form a mixed solution; adding the solution A into the mixed solution for reaction, separating precipitates after reaction, and performing washing and drying. The catalyst has rich pyridine nitrogen, graphite nitrogen and metal nitrogencatalytic active sites, highly dispersed transition metal nanoparticles and carbon nanotubes, a developed three-dimensional pore structure and a high graphitization degree, so that the catalyst has relatively high oxygen reduction catalytic performance and can be widely applied to air electrode oxygen catalytic reduction of various fuel cells.

Description

technical field [0001] The invention relates to a preparation method of a transition metal-nitrogen-carbon nanotube co-doped active carbon oxygen reduction catalyst, which belongs to the field of catalyst preparation. Background technique [0002] Microbial fuel cells can convert the chemical energy contained in organic matter in wastewater into electrical energy. Efficient cathode oxygen reduction (ORR) performance is crucial to ensure the energy conversion efficiency of microbial fuel cells. However, due to the low operating temperature (room temperature) and the neutral condition of the electrolyte of microbial fuel cells, it is difficult for the cathode ORR reaction to proceed according to the theoretical four-electron pathway. Slow cathode ORR kinetics will lead to increased cathode overpotential and reduce the power generation performance of microbial fuel cells. Therefore, there is an urgent need to develop highly active ORR catalysts suitable for microbial fuel cel...

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Problems solved by technology

However, how to effectively increase the number of catalytic active sites of activated carbon, increase its degree of graphitization, and further improve the ORR catalytic performance of activated carbon is still a huge challenge in this field.

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