A kind of preparation method of porous graphene supported transition metal nanocomposite catalyst

Abstract

The invention provides a preparation method of a nano composite catalyst of porous graphene loading a transition metal. The method is as follows: bamboo and pine dust powder or leftover material and the like are calcined at high temperature in anoxic atmosphere, then immersed into a transition metal ion- containing solution, maintained for 1 ~ 1000 minutes, then taken out, then calcined at high temperature in anoxic atmosphere, and immersed into a strong oxidizing solution, so that the bamboo charcoal or charcoal graphite structure is fully oxidized into graphite oxide; then the graphite oxide is taken out and placed in anoxic atmosphere for calcination for 0.01 ~ 0.5 hour at the high temperature of 500 to 1000 DEG C. The graphene prepared by the method is in a porous structure, has good water permeability and air permeability characteristics, can meet fast mass transfer requirement required by electrode reaction; transition metal nanoparticles are firmly attached to the inner wall of graphene channels to react with transferred-in water, gas and electrons to form numerous micro three-phase reaction zones, the reaction activity area is greatly increased, and the catalyst has excellent catalytic reaction activity.

Description

technical field [0001] The invention belongs to the field of electrochemical catalysis, in particular to a method for preparing a proton exchange membrane fuel cell catalyst, in particular to a method for preparing a porous graphene-loaded transition metal nanocomposite catalyst. Background technique [0002] A fuel cell is an energy conversion device that directly converts chemical energy stored in fuel into electrical energy. Because it does not need to go through the Carnot cycle, it has high energy density and energy conversion efficiency. It is a new type of green energy technology. Fuel cells can be divided into five categories according to the nature of the electrolyte used in the battery: alkaline fuel cells with potassium hydroxide as the electrolyte, phosphoric acid fuel cells with concentrated phosphoric acid as the electrolyte, and perfluorinated or partially fluorinated sulfonic acid type protons. Proton exchange membrane fuel cell (PEMFC) with exchange membrane...

AI Technical Summary

Problems solved by technology

This results in a great waste of materials, and severely limits the three-phase catalytic reaction area, which cannot significantly improve the catalytic activity of the electrode.

Images