Low temperature catalytic fused salt electrolyte capable of increasing electro-oxidation performance of carbon

Abstract

The invention provides a low temperature catalytic fused salt electrolyte capable of increasing electro-oxidation performance of carbon. The low temperature catalytic fused salt electrolyte comprises a catalyst composed of a variant valence metal oxide powder and a salt capable of forming an eutectoid with the variant valence metal oxide, and carbonate, wherein the catalyst is CsVO3-MoO3 or Cs2MoO4-V2O5 with a molar ratio of 3:1; the carbonate is Li2CO3 and K2CO3, or Li2CO3, Na2CO3 and K2CO3; and the electrolyte accounts for 5%-20% of the mass ratio of the carbonate. The low temperature catalytic fused salt electrolyte is advantageous in that the variant valence metal oxide added in a fused carbonate electrolyte system has a prominent effect for significantly increasing the electrochemical oxidation performance of a carbon anode. Compared with other methods (such as treating by alkali carbonate, coating metal on carbon surface, synthesizing carbon with high activity, etc.) for increasing the electro-oxidation performance of carbon, the method provided by the invention is simple and useful, can be operated easily, and is suitable for applications in large-scale direct carbon fuel cells.

Description

technical field [0001] The invention relates to an electrolyte system of a direct carbon fuel cell. Background technique [0002] Direct carbon fuel cell (DCFC) is a special type of fuel cell that uses solid carbon (such as coal) as fuel directly. It generates electricity through the electrochemical oxidation of carbon at the anode and the electrochemical reduction of oxygen at the cathode. As an electrochemical power generation method, DCFC breaks through the limitation of heat engine efficiency of traditional thermal power generation, and does not undergo carbon combustion reaction in the process of coal-to-electricity conversion. Therefore, direct carbon fuel cells have high energy conversion efficiency and low pollutant emission. The outstanding advantage of less emissions. First of all, the theoretical efficiency of DCFC is 100%, and the actual electrical efficiency can reach more than 80%. Secondly, DCFC emits less pollutants, and the exhaust gas emitted is high-puri...

AI Technical Summary

Problems solved by technology

They mainly start with improving the activity of the carbon anode, such as pre-wetting the carbon anode, acid-base treatment, coating the carbon surface with metal, and preparing highly active carbon fuel, etc. However, as the reaction proceeds, the treated carbon is consumed If it falls off, the effects of infiltration treatment and acid-base treatment will also disappear, and the coated metal will fall off, which cannot continuously improve the performance of carbon electrooxidation.

Another example is to directly add the variable price metal oxide MnO in the electrolyte 2 , Fe 2 o 3 、Co 3 o 4 etc., the electrochemical oxidation reaction performance of the carbon anode is also improved to a certain extent, but the solubility of variable-valent metal oxides in the electrolyte is very low, which is a trace level, and the performance improvement is very limited, and the battery needs to work at a higher temperature, so , the use of this method is affected by many factors and the reliability is relatively poor

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