Preparation of silk-like non-precious-metal nanotube oxygen reduction electrocatalyst

An electrocatalyst and nanotube technology, applied in the field of electrocatalysis, can solve the problems of limited practical application and complete commercialization, troubled by cost and life problems, lack of precious metal Pt resources, etc., achieving good methanol poisoning ability, low production cost, Catalytic activity and stability of aerobic reduction

Inactive Publication Date: 2013-05-22
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of fuel cell industrialization, its cost and life issues have always been the core issues that plague its development.
Due to the scarcity of precious metal Pt resources, the price is relatively expensive, which limits its practical application and complete commercialization.

Method used

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  • Preparation of silk-like non-precious-metal nanotube oxygen reduction electrocatalyst
  • Preparation of silk-like non-precious-metal nanotube oxygen reduction electrocatalyst
  • Preparation of silk-like non-precious-metal nanotube oxygen reduction electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dissolve 2.0 g of L-lysine in a flask filled with 30 mL of aqueous ethanol and sonicate until completely dissolved, and dissolve 2 mL of FeCl with a concentration of 0.05 g / mL 3 Add the solution dropwise into the above flask, stir and sonicate for 30 min, then add 0.4 g of silica nanospheres (d=30±10 nm) into the above flask, stir and sonicate for 60 min, then evaporate it on a rotary evaporator. To dry, simply dry in the oven. The obtained samples were heated to 300°C at a rate of 5°C / min and stayed for 1 h in a tube furnace under the protection of nitrogen, then raised to 900°C and taken out after staying for 1 h. The silica template was removed from the hydrofluoric acid solution, filtered with suction, washed with water, and dried to obtain the catalyst.

[0030] The half-wave potential of the catalyst for catalytic oxygen reduction in 0.1 M KOH saturated oxygen solution is -96.7 mV, which is 23.6 mV earlier than the commercial Pt / C (Jonhson-Matthey Company) cataly...

Embodiment 2

[0032] Dissolve 2.0 g of arginine in a flask containing 40 mL of ethanol aqueous solution and sonicate until it is completely dissolved, add 3 mL of NiCl solution with a concentration of 0.04 g / mL into the above flask, stir and sonicate for 50 min, and then dissolve 0.8 g The silica nanospheres were added into the above flask, stirred and ultrasonicated for 60 min, evaporated to dryness on a rotary evaporator, and dried in an oven. The obtained samples were heated to 400°C at a rate of 5°C / min in a tube furnace under the protection of nitrogen and stayed for 1 h, then raised to 900°C and taken out after staying for 1 h. The silica template is removed from the hydrofluoric acid solution, filtered with suction, washed with water and dried to obtain the catalyst.

[0033] The half-wave potential of the catalyst for catalytic oxygen reduction in 0.1 M KOH saturated oxygen solution is -100.7 mV, which is 19.6 mV earlier than the commercial Pt / C (Jonhson-Matthey Company) catalyst. ...

Embodiment 3

[0035] Dissolve 2.0 g of histidine in a flask containing 50 mL of ethanol aqueous solution and sonicate until completely dissolved, and add 4 mL of 0.04 g / mL CoCl 2The solution was added dropwise to the above flask, stirred and ultrasonicated for 60 min, then 0.8 g of silica nanospheres were added to the above flask, stirred and ultrasonically 60 min, evaporated to dryness on a rotary evaporator, and dried in an oven. The obtained samples were heated to 250°C at a rate of 5°C / min in a tube furnace under the protection of nitrogen, stayed for 1 h, then raised to 900°C, and taken out after staying for 1.5 h. The silica template was removed from the hydrofluoric acid solution, filtered with suction, washed with water, and dried to obtain the catalyst.

[0036] The half-wave potential of the catalyst for catalytic oxygen reduction in 0.1 M KOH saturated oxygen solution is -99.7 mV, which is 20.6 mV earlier than the commercial Pt / C (Jonhson-Matthey Company) catalyst.

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Abstract

The invention provides a preparation of a silk-like non-precious-metal nanotube oxygen reduction electrocatalyst, and belongs to the technical field of an electrode catalytic material. A fuel cell cathode catalyst with a high catalytic activity to the oxygen reduction is prepared by serving amino acid as a carbon source and a nitrogen source, serving silicon dioxide as a template and serving chloride of metals Fe, Co and Ni as accelerants, and carrying out temperature programming and thermal cracking under the protection of inert gases, and the used raw materials in the process of preparation are not precious metals, thus the non-precious metallization of the catalyst is realized, the cost of the oxygen reduction electrocatalyst is effectively reduced, and a certain foundation is laid for the industrialization of the fuel cell; and meanwhile, the oxygen reduction electrocatalyst prepared by the invention has good oxygen reduction catalytic activity and stability and has the ability of good methanol poisoning resistance, and therefore, the oxygen reduction electrocatalyst becomes a non-precious metal catalyst which can replace a commercial Pt/C (platinum/carbon) catalyst, and can be used for a proton exchange membrane fuel cell cathode oxygen reduction electrocatalyst.

Description

Technical field [0001] The present invention is the field of electrical catalytic technology, involving a preparation of a non -precious metal fuel cell oxygen reduction catalyst, especially the preparation of a silk -shaped non -precious metal nanopotoro oxygen. Background technique [0002] With the shortage of energy and the pollution of the environment and the improvement of people's quality of life, the problem of solving energy and improving the environment is imminent.The fuel cell, as a power generation device that converts the chemical energy of fuel into electrical energy directly through electrochemical reactions without burning, is a green energy technology, because its discharge materials do not contain nitrogen oxides, granules and other harmful gases, etc.As a green energy source that can improve environmental pollution and global greenhouses, the above problems are solved. Therefore, the popularity of fuel cells in the future and market prospects are widely antici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J23/755B01J23/75B01J35/02H01M4/90
CPCY02E60/50
Inventor 王荣方周田宝王辉
Owner NORTHWEST NORMAL UNIVERSITY
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