Preparation method of Fe and N-doped porous carbon nanofiber applicable to cathode catalyst for polymer fuel cell

Abstract

The invention discloses a preparation method of a Fe and N-doped porous carbon nanofiber applicable to a cathode catalyst for a polymer fuel cell. The preparation method comprises the following concrete steps: mixing a carbon nanofiber with pyrrole in proportion, adding a certain amount of a ferric iron ion solution, polymerizing the pyrrole, uniformly coating the surface of the carbon nanofiber with the polymerized pyrrole, removing unreacted impurities, performing suction filtration, naturally drying, soaking the carbon nanofiber coated with the polymerized pyrrole in the iron ion solution, absorbing ferric iron ions until the saturation rate is reached, then, performing suction filtration and drying, and performing high-temperature treatment, acid reflux and high-temperature treatment to obtain an efficient Fe and N-doped porous carbon nanofiber electrocatalyst. The Fe and N-doped porous carbon nanofiber is prepared from the carbon nanofiber, pyrrole and iron ions as precursors; raw materials are low in price and easily available; the Fe and N-doped porous carbon nanofiber can be easily produced on a large scale and can replace an expensive Pt-based material to serve as the stable and efficient catalyst for oxygen reduction reaction of the fuel cell.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a method for preparing a Fe and N co-doped porous carbon nanofiber material that can be used as a fuel cell oxygen reduction reaction catalyst. Background technique [0002] Efficient and environmentally friendly polymer fuel cells have received great attention in the field of energy conversion and utilization. A fuel cell is composed of a cathode oxygen reduction reaction and an anode fuel substance oxidation reaction, wherein the cathode oxygen reduction reaction is the main factor limiting the wide application of fuel cells. The noble metal platinum has long been used as a catalyst to catalyze the oxygen reduction reaction at the cathode of polymer fuel cells, but the limited platinum content makes them expensive. Moreover, Pt has poor reaction selectivity to fuels such as methanol and intermediate product carbon monoxide, and is easy to be poisoned an...

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Problems solved by technology

As a new type of material that can be prepared in large quantities and has excellent performance, carbon nanomaterials can overcome some inherent shortcomings of tradit

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