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Transition metal composite oxide catalytic material and microwave preparation method thereof

A composite oxide and transition metal technology, applied in the field of electrochemistry, can solve the problems of difficult control, complex preparation process, and difficulty in nanoscale transition metal spinel-type composite oxides, and achieves fast heating speed, uniform distribution, increased The effect of product specific surface area

Inactive Publication Date: 2010-12-08
TIANJIN JIUJU ENERGY TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis methods of composite oxides reported in the literature include high-temperature solid-state reaction of nitrate, high-temperature sputtering technology, sol-gel method, combustion method, etc. There have always been difficulties in the preparation process, and the preparation process is complicated and difficult to control

Method used

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  • Transition metal composite oxide catalytic material and microwave preparation method thereof
  • Transition metal composite oxide catalytic material and microwave preparation method thereof
  • Transition metal composite oxide catalytic material and microwave preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Press CoMn 2 o 4 stoichiometric ratio (Co:Mn molar ratio 1:2), weigh cobalt nitrate (Co(NO 3 ) 2 6H 2 O) 2.91g (0.01mol) and manganese nitrate (Mn(NO 3 ) 2 ) 3.58g (0.02mol), add 3.6g of distilled water (the molar ratio of distilled water and Co is 20:l) to form a solution, and magnetically stir until the nitrate is fully dissolved. Then add 1.6g of Cabot's Vulcan XC-72 product, stir for 1 hour, centrifuge to collect the precipitate, wash the precipitate, put it in an oven at 75°C for 24 hours, and then grind it into powder to obtain the precursor.

[0035] (2) Heat the precursor in a microwave oven for 140s at a microwave power of 750W to obtain CoMn 2 o 4 It is a catalytic material with catalytically active components and Vulcan XC-72 as a carrier.

[0036] (3) The obtained catalytic material is made into an air electrode according to the traditional method, and this is used as the positive electrode, the zinc sheet is used as the negative electrode, and 7mo...

Embodiment 2

[0038] (1) Press CoFe 2 o 4 The stoichiometric ratio (Fe to Co molar ratio 2:1) Weigh 0.02mol of ferric nitrate and 0.01mol of cobalt nitrate, add 3.6g of distilled water to make a solution (the molar ratio of distilled water to Fe is 20:l), magnetic stirring When the nitrate is fully dissolved, add 1.6g of Cabot’s Vulcan XC-72 product, stir magnetically for 1.5 hours, centrifuge to collect the precipitate, wash the precipitate, put it in an oven at 75°C and fully dry it for 24 hours, then grind it into powder. That is, the precursor is obtained.

[0039] (2) Heating the precursor in a microwave oven for 210s at a microwave power of 750W yields CoFe 2 o 4 It is a catalytic material with active ingredient and Vulcan XC-72 as carrier.

[0040] (3) The obtained catalytic material is made into an air electrode according to the traditional method, and this is used as the positive electrode, the zinc sheet is used as the negative electrode, and 7mol / L KOH is used as the electrol...

Embodiment 3

[0042] (1) Press MnCo 2 o 4 The stoichiometric ratio (Mn to Co molar ratio 1:2) Weigh 0.01mol of manganese acetate and 0.02mol of cobalt acetate (both AR), add 3.6g of distilled water to make a solution, add 10ml according to the stoichiometric ratio, the concentration is 3.6 mol / L ammonium oxalate (AR) solution (excess 20%) was reacted under constant stirring for 1 hour, and then centrifuged to collect the precipitate. The precipitate was washed and dried at 75°C. The resulting solid product mixture of cobalt oxalate and manganese oxalate was the precursor.

[0043] (2) Add 1.6g of microwave absorbing agent acetylene black to the precursor, then add absolute ethanol and stir until it becomes a paste, dry it at 60°C, grind it into powder, and heat it in a microwave oven with a microwave power of 320W for 80s. MnCo 2 o 4 It is a catalytic material with active ingredient and acetylene black as carrier.

[0044] (3) The obtained catalytic material is made into an air diffusio...

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Abstract

The invention discloses a transition metal composite oxide catalytic material and a microwave preparation method thereof, can output larger working voltage under higher current density, and has simple preparation method, easily controlled preparation process and rich raw material resources. The preparation method comprises the following steps: taking the nitrates of two transition metals according to the stoichiometric ratio of two metal elements, adding distilled water to prepare a solution, adding carbon black, stirring for reaction, and centrifuging to obtain the precipitate; washing the precipitate; drying at 50-80 DEG C and pulverizing to obtain a precursor, wherein the mass ratio of the transition metal composite oxide to the carbon black is 6:4, the A transition metal is one of Co, Mn, Fe and Ni, and the B transition metal is one of Co, Mn and Fe; and calcining the precursor by microwave to obtain the transition metal composite oxide catalytic material. The microwave calcining method of the invention has simple process and high efficiency, and the prepared spinel has a nano crystal form, small particle size and even distribution.

Description

technical field [0001] The invention relates to the field of electrochemistry, and more specifically relates to a transition metal composite oxide catalytic material used for an air electrode of an alkaline fuel cell and a microwave preparation method thereof. Background technique [0002] The positive electrode reaction of the fuel cell is the reduction reaction of oxygen. The positive electrode of the fuel cell that directly uses the oxygen in the air as the oxidant is the air electrode. Oxygen reduction reaction process is complex and kinetics is slow, which is the main part of fuel cell voltage loss. The performance of the air electrode directly determines the voltage, current and power of the battery. Catalytic materials are key technologies for air electrodes and fuel cells. [0003] At present, platinum group metals are the most effective cathode catalyst materials in low-temperature fuel cells, but the cost of platinum group noble metals as catalytic materials is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B01J23/889B01J23/75B01J23/755B01J37/34
CPCY02E60/50
Inventor 周德壁
Owner TIANJIN JIUJU ENERGY TECH DEV
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