Preparation and catalytic performance study of hierarchical self-supporting oxygen reduction reaction
As an efficient energy storage and conversion device,fuel cell is a new power source with broad application prospects in many fields.To design and regulate the structure and performance of carbon nanomate-rials,a novel synthesis method for carbon-coated cobalt nanoparticle nanotube array self-supporting material(CC@Co-CNTs)with a armor structure was proposed in this paper.First,a leaf-shaped nanoplate array pre-cursor was formed on the surface of carbon cloth by growing a metal-organic framework compound.Then,af-ter the vapor phase transformation of diamine,a multi-level self-supporting nanotube material was obtained.Electrochemical testing showed that at 1 600 r/m,the half-wave potential of the self-supporting electrode was as high as 0.78 V,the limiting current density was-12.14 mA/cm2,the capacitance value was about 4.2 times that of the CC@Co-NCNA material,and the current retention rate was as high as 75.0%after 500 min of con-tinuous testing.It also had good resistance to methanol.This was attributed to the introduction of the carbon-coated Co nanoparticle nanotube array,which not only increased the surface area but also protected the cata-lyst.Meanwhile,the carbon nanotubes formed multi-level ion transport channels for the electrolyte,effective-ly shortening the ion transport path and improving the electrocatalytic performance.
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