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Preparation method of all-pH fuel cell cathodic oxygen reduction electrocatalyst

A fuel cell cathode and electrocatalyst technology, which is applied in the field of preparing metal-free nitrogen-doped porous carbon and metal-free nitrogen-doped porous carbon materials, can solve the problems of reducing the catalytic stability of materials and increasing costs, and achieve the improvement of electrocatalytic performance , controllable conditions and simple preparation method

Inactive Publication Date: 2019-07-26
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, those carbon nanomaterials with benign behavior under acidic conditions are usually functionalized with metal impurities or complexes, which inevitably increases the cost and also reduces the catalytic stability of the materials.
In order to cater to the current commercial market, the development of metal-free heteroatom-doped carbon nanomaterials suitable for the entire pH range environment makes the oxygen reduction electrocatalytic performance of nitrogen-doped carbon materials in acidic, neutral and alkaline media reach or even exceed Commercial platinum carbon, a big challenge

Method used

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  • Preparation method of all-pH fuel cell cathodic oxygen reduction electrocatalyst
  • Preparation method of all-pH fuel cell cathodic oxygen reduction electrocatalyst
  • Preparation method of all-pH fuel cell cathodic oxygen reduction electrocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0049] (1) Collect the waste papaya peel, wash it with deionized water and dry it, weigh 3 g into a corundum boat, put it in a tube furnace, and under the protection of inert gas nitrogen, the ventilation rate is 80 mL min -1 , at 5 ℃ min -1 The temperature was raised to 400 °C at a rate of 2 h, and then at 5 °C min -1 Cool to 300 °C to obtain pre-carbonized product A1.

[0050] (2) Weigh 0.6 g of pre-carbonized product A1 and 1.8 g of melamine with an analytical balance at a mass ratio of 1:3, and then place them in a ball mill with a ball milling speed of 300 rpm. min, put the ball-milled mixture into a corundum boat, place it in a tube furnace, and under the protection of inert gas nitrogen, the ventilation rate is 80 mL min -1 , at 3°C ​​min -1 The temperature was raised to 300 °C at a rate of 2 h, and then at 3 °C min -1 Cool to 100 °C to obtain nitrogen-doped product B1.

[0051] (3) Weigh 1.8 g of potassium bicarbonate with an analytical balance at a mass ratio of ...

Embodiment 2

[0056] (1) Collect the waste papaya peel, wash it with deionized water and dry it, weigh 3 g into a corundum boat, put it in a tube furnace, and under the protection of inert gas nitrogen, the ventilation rate is 80 mL min -1 , at 5 ℃ min -1 The temperature was raised to 400 °C at a rate of 2 h, and then at 5 °C min -1 Cool to 300°C to obtain pre-carbonized product A2.

[0057] (2) Weigh 0.6 g of pre-carbonized product A2 and 1.8 g of melamine with an analytical balance at a mass ratio of 1:3, and then place them in a ball mill with a milling speed of 300 rpm. min, put the ball-milled mixture into a corundum boat, place it in a tube furnace, and under the protection of inert gas nitrogen, the ventilation rate is 80 mL min -1 , at 3°C ​​min -1 The temperature was raised to 300 °C at a rate of 2 h, and then at 3 °C min -1 Cool to 100 °C to obtain nitrogen-doped product B2.

[0058] (3) Weigh 1.8 g of potassium bicarbonate with an analytical balance at a mass ratio of 1:3 (A...

Embodiment 3

[0063] (1) Collect the waste papaya peel, wash it with deionized water and dry it, weigh 3 g into a corundum boat, put it in a tube furnace, and under the protection of inert gas nitrogen, the ventilation rate is 80 mL min -1 , at 5 ℃ min -1 The temperature was raised to 400 °C at a rate of 2 h, and then at 5 °C min -1 Cool to 300 °C to obtain pre-carbonized product A3.

[0064] (2) Weigh 0.6 g of pre-carbonized product A3 and 1.8 g of melamine with an analytical balance at a mass ratio of 1:3, and then place them in a ball mill with a ball milling speed of 300 rpm. min, put the ball-milled mixture into a corundum boat, place it in a tube furnace, and under the protection of inert gas nitrogen, the ventilation rate is 80 mL min -1 , at 3°C ​​min -1 The temperature was raised to 300 °C at a rate of 2 h, and then at 3 °C min -1 Cool to 100 °C to obtain nitrogen-doped product B3.

[0065] (3) Weigh 1.8 g of potassium bicarbonate with an analytical balance at a mass ratio of ...

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Abstract

The invention discloses a method for preparing a metal-free nitrogen-doped porous carbon material from waste biomass and an all-pH fuel cell cathodic oxygen reduction electrocatalyst. The method comprises taking agricultural fruit and vegetable waste such as papaya peel as the raw materials, potassium bicarbonate as the activator and melamine as the nitrogen source to perform nitrogen doping at arelatively low temperature of 300 DEG C and then carbon material activation at 900 DEG C, and then increasing the degree of graphitization; before second carbonization is implemented, performing grinding to improve the reaction activity and the nitrogen doping effectiveness; performing acid pickling and drying to obtain the metal-free nitrogen-doped porous carbon material. The metal-free nitrogen-doped porous carbon material can be applied as the all-pH fuel cell cathodic oxygen reduction electrocatalyst. The preparation method converts the low-cost agriculture fruit and vegetable waste into the high-value energy material. The metal-free nitrogen-doped porous carbon material is comparable in electrocatalytic performance with oxygen reduction Pt / C catalysts and high in resistance to methylalcohol and cycling stability and has a great potential application prospect in all-pH fuel cell cathodic oxygen reduction electrocatalysis.

Description

technical field [0001] The invention belongs to the field of inorganic nanometer materials and electrochemistry, and relates to a metal-free nitrogen-doped porous carbon material, in particular to a method for preparing metal-free nitrogen-doped porous carbon based on discarded agricultural, forestry, fruit and vegetable waste and its fuel in the full pH range. Catalytic applications in battery cathode oxygen reduction. Background technique [0002] Oxygen reduction reaction (ORR) is a key cathode reaction in fuel cells and has been widely studied and applied for many years. Oxygen reduction reactions may also undergo our undesirable 2-electron transfer pathway with hydrogen peroxide (H 2 o 2 ) and hydrogen peroxide (HO 2 - ) by-products are formed. Considering the high activity and direct 4-electron transfer pathway, platinum and its alloys are considered as superior performance commercial oxygen reduction electrocatalysts. However, high cost, low selectivity, suscept...

Claims

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Application Information

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IPC IPC(8): C01B32/05B01J27/24B01J35/00B01J37/08H01M4/90
CPCC01B32/05H01M4/90B01J27/24B01J37/082B01J37/084B01J35/33Y02E60/50
Inventor 徐朗虞乐建杨闯闯张文都齐佳伟
Owner CHINA UNIV OF MINING & TECH
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