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A method for improving carbon activity of direct carbon fuel battery

A fuel cell and active technology, applied in the direction of fuel cells, battery electrodes, circuits, etc., can solve the problems of low specific surface, low hydrophilicity, and large ash content of carbon anode, so as to improve performance, reduce hydrophobicity, and increase ratio The effect of surface area

Inactive Publication Date: 2008-08-06
HARBIN ENG UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for improving the carbon activity of direct carbon fuel cells that can overcome the shortcomings of existing carbon anodes such as large ash content, low hydrophilicity and low specific surface area, and solve the problem of small discharge current of MCDCFC carbon anodes

Method used

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Experimental program
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Effect test

Embodiment 1

[0015] The carbon anode was treated with HCl, the ratio of acid to carbon was 2:1, the acid concentration was 2M, and the soaking time was 1 h. With NiO as the cathode (obtained from foamed Ni through in-situ oxidation and lithiation), 0.5atm O 2 / CO 2 =1:2 is the oxidizing agent, γ-LiAlO 2 The membrane is an electrolyte carrier diaphragm, and the MCDCFC is prepared. At 700°C and a voltage of 0.75V, the current density reaches 120mA / cm 2 , corresponding to a power density of 90mW / cm 2 .

Embodiment 2

[0017] The carbon anode is treated with HF, the ratio of acid to carbon is 2:1, the concentration of acid is 2M, and the soaking time is 1h. With NiO as the cathode (obtained from foamed Ni through in-situ oxidation and lithiation), 0.5atm O 2 / CO 2 =1:2 is the oxidizing agent, γ-LiAlO 2 The membrane is an electrolyte carrier diaphragm, and the MCDCFC is prepared. At 700 ° C and a voltage of 0.8 V, the current density reaches 130 mA / cm 2 , corresponding to a power density of 104mW / cm 2 .

Embodiment 3

[0019] Using HNO 3 To treat the carbon anode, the ratio of acid to carbon is 2:1, the concentration of acid is 2M, and the soaking time is 1h. With NiO as the cathode (obtained from foamed Ni through in-situ oxidation and lithiation), 0.5atm O 2 / CO 2 =1:2 is the oxidizing agent, γ-LiAlO 2 The membrane is an electrolyte carrier diaphragm, and the MCDCFC is prepared. At 700°C and a voltage of 0.8V, the current density reaches 140mA / cm 2 , corresponding to a power density of 112mW / cm 2 .

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Abstract

The present invention provides a method of improving carbon activity of direct carbon fuel cells. Acid and carbon are mixed according to the proportion of 2 to1; the concentration of acid is 1-5M; the soak time is one hour. The method has the advantages that: acid is adopted to treat anode carbon of MCDCFC; firstly, acid treatment can clear (at least partially) the impurities of activated carbon, reduce ash content in the carbon and then increase the specific surface area of the carbon as well as the total pore volume; secondly, acid treatment can ensure that more unsaturated carbon atoms, defects, dislocations and faults can be exposed on the surface of the carbon, and the positions have a great deal of unpaired electrons, having very strong adsorption; thirdly, acid treatment can decompose alkaline and neutral group on the surface of the carbon and produce more acidic group, and as the acidic group is favorable for attracting anions in solution, the hydrophobicity of the carbon can be decreased. Therefore, the method can remarkably improve the performance of MCDCFC with carbon powder as fuel.

Description

(1) Technical field [0001] The invention relates to a method for making a battery, in particular to a method for improving the performance of the battery. (2) Background technology [0002] A fuel cell is a green energy conversion device that directly converts the chemical energy in fuel into electrical energy in an efficient and environmentally friendly manner through an electrochemical reaction. It can simultaneously solve two world problems of energy saving and environmental protection. The theoretical energy conversion efficiency of solid carbon directly as fuel (MCDCFC) can reach 100%, and its waste gas emission is only one-tenth of that of traditional coal-fired power generation, and solid carbon fuel is rich in sources and low in price, so MCDCFC is more efficient than natural gas Molten carbonate fuel cells and traditional coal-fired power generation have greater energy saving, environmental protection and economic advantages. The reaction principle of the molten ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M8/00C01B31/00
CPCY02E60/50
Inventor 王贵领曹殿学吕艳卓王静
Owner HARBIN ENG UNIV
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