58 results about "Methanol poisoning" patented technology

The invention discloses a metal alloy-carbon nanotube network macroscopic body composite material, a preparation method and application thereof. The preparation method comprises the following steps providing a carbon nanotube network macroscopic body, wherein the carbon nanotube network macroscopic body contains elemental iron serving as a trace impurity; carrying out activation treatment on the carbon nanotube network macroscopic body; making the activated carbon nanotube network macroscopic body contact a metal precursor solution to enable the elemental iron and the metal precursor to be subjected to a replacement reaction to generate an elemental metal combined with the elemental iron, wherein the elemental metal has oxygen reduction catalytic activity, and then drying treatment is conducted; and finally carrying out transient electric heating to obtain the composite material. According to the invention, the preparation method is low in cost, simple and easy to implement and short in consumed time, the binding force between the carbon nanotube network macroscopic body and the metal alloy nanoparticles in the obtained composite material is high, the catalytic performance is excellent, the stability is high, the methanol poisoning resistance is excellent, and the carbon nanotube network macroscopic body can be directly used as an oxygen electrode for a metal-air battery.

The invention relates to preparation of a supported hollow sphere carbon material and application in electrocatalytic performance. A metal macrocyclic complex is supported by taking a hollow sphere carbon material as a carrier. The preparation method of the catalyst comprises the following steps of: (1) adding a certain amount of a template agent into ethanol and an alkaline solution, adding dopamine hydrochloride and derivatives thereof, stirring, centrifuging, drying, carrying out high-temperature treatment, carrying out alkaline washing to remove the template, washing with water to neutrality, and drying to obtain a hollow sphere carbon carrier, and (2) dissolving or dispersing the transition metal macrocyclic complex in an organic solvent, mixing with the hollow sphere carbon carrier prepared in the step (1), carrying out ultrasonic treatment, rotary evaporation, high-temperature roasting and acid washing to remove impurities, and washing to neutrality to obtain the supported non-noble metal electrocatalyst. The preparation method has the advantages that the preparation method is simple and easy to control, large-scale application is easy, and the prepared non-noble metal catalyst has very high oxygen reduction catalytic activity, selectivity and methanol poisoning resistance while the cost is reduced, thereby realizing a wide application prospect.

The invention discloses a cobalt-based transition metal oxygen reduction catalyst, a preparation method and application thereof. The method including the steps of: adding a cobalt salt and a nitrogen-containing organic ligand into ethanol respectively and letting the two substances fully react to form a cobalt complex solution; adding a carbon material into the solution, and carrying out reflux reaction in oil bath to make the cobalt complex uniformly adsorbed on the carbon material surface; removing ethanol by evaporation, and grinding the remaining material uniformly to obtain black powder; and conducting heat treatment on the black powder in an inert gas atmosphere for 0.5-3h at 600-900DEG C, thus obtaining the cobalt-based transition metal oxygen reduction catalyst. The catalyst abandons the noble metal platinum, effectively reduces the making cost of fuel cells, and has very high oxygen catalytic activity, high catalytic stability and good methanol poisoning resistance, is easy to realize mass production, and can be widely used in fuel cells.

The invention relates to an iron, cobalt and nitrogen codoped carbon catalyst and a preparation method and application thereof. An iron / cobalt double-metal zeolite imidazate framework material is adopted as a precursor, and the iron, cobalt and nitrogen codoped carbon catalyst is prepared and obtained through high-temperature pyrolysis, wherein the iron / cobalt double-metal zeolite imidazate framework material is prepared by adopting ferrous sulfate, cobalt nitrate and 2-methylimidazole to carry out a self-assembly reaction in a solvent under an oxygen-free environment. The iron, cobalt and nitrogen codoped carbon catalyst prepared in the invention has the advantages that the oxygen reduction catalytic activity, electrochemical stability and methanol poisoning resistance is superior to those of commercial Pt / C, the cost is low, the preparation method is simple and volume production can be realized. The catalyst disclosed by the invention can be widely applied to the fields of fuel batteries, metal-air batteries and the like.