Molten carbonate electrolyte containing variant valence metallic oxide and application thereof in carbon fuel cell

Abstract

This invention discloses a molten carbonate electrolyte containing a variant valence metallic oxide and application thereof in a carbon fuel cell. Fine particles which are composed of 3-5% of variant valence metallic oxide powder and 97-95% of a mixture of Li2Co3 and K2CO3 electrolytes by weight percent are used as a molten carbonate electrolyte system, a graphite rod is used as a carbon anode, 33% of O2 and 67% of CO2 / Au are used as reference electrodes, and a steel drum is used as a counter electrode, so that a tri-electrode system is formed. In the invention, the variant valence metallic oxide is used as a catalyst so that the electric oxidation property of the carbon in the molten carbonate is improved, and the defect of losing catalytic activity, the defect of large electrolyte resistance and the like, which are caused by dropping the variant valence metallic oxide after directly adding the variant valence metallic oxide into the carbon anode, are overcome, the initial polarization potential and current density of the carbon anode in the same potential are improved and the resistance of the electrolyte is reduced.

Description

technical field [0001] The invention relates to a direct carbon fuel cell electrolyte system. Specifically, it is a molten carbonate electrolyte system added with variable valence metal oxides. The invention also relates to an application method of the molten carbonate electrolyte containing variable-valence metal oxides in carbon fuel cells. Background technique [0002] A direct carbon fuel cell 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. In this coal-to-electricity conversion process, there is no combustion, no heat engine, and no need to reform and gasify coal. Therefore, direct carbon fuel cells not only have the characteristics of high efficiency and environmental protection, but also have a wide range of fuel sources, including coal , oil, natural gas, and even biofuels. In addit...

AI Technical Summary

Problems solved by technology

[0006] In order to further improve the power generation capacity of direct carbon fuel cells, researchers currently start with improving the electrochemical activity of carbon anodes, such as soaking activated carbon anodes, acid-base treatment, carbon surface coating with metals, and preparation of highly active carbon fuels. As the reaction proceeds, the treated carbon is consumed, the effects of infiltration treatment and acid-base treatment also disappear, and the coated metal will fall off, which cannot continue to continuously improve the electro-oxidation performance of carbon.