Direct Formic Acid Fuel Cells Catalyzed by Vanadium Oxide Sulfate Homogeneously

Abstract

The invention relates to a fuel cell technology and aims to provide a direct formic acid fuel cell with vanadium sulfate oxide homogeneous assisted catalysis. The preparation method for modified formic acid fuel in the fuel cell comprises the following steps of: heating one liter of concentrated sulfuric acid with a mass concentration of 98 wt% to 70-90 DEG C, adding 0.1-1 mol of NH4VO3 and conducting stirring and reacting for 5 h, after cooling to room temperature, adding 1-4 liters of formic acid aqueous solution with a mass concentration of 30-60 wt% to obtain modified formic acid fuel containing a (VO)SO4 cocatalyst. (VO)SO4 is added into the formic acid solution to play a co-catalytic role, dehydration reaction of formic acid on a solid catalyst is prevented, and catalyst poisoning iseffectively avoided. The cocatalyst exists in the formic acid solution, is not restricted by the supported area of the solid catalyst, can play the role of the cocatalyst to the maximum extent and does not reduce the supported amount of the main catalyst on the solid carrier. The active center is homogeneous and has high activity, and the electrochemical reaction speed of the formic acid is greatly improved. A new idea is provided for design and performance improvement of direct formic acid fuel cells.

Description

technical field [0001] The invention relates to fuel cell technology, in particular to a direct formic acid fuel cell with homogeneous assisted catalysis of vanadium oxide sulfate. Background technique [0002] A fuel cell is a high-efficiency energy conversion device that directly converts the chemical energy stored in the fuel into electrical energy. Because it does not need to go through the Carnot cycle, it has high energy density and energy conversion efficiency. It is a new type of green energy technology. In recent years, due to innovative breakthroughs in fuel cell (Fuel Cell) technology, coupled with multiple pressures such as environmental protection issues and energy shortages, governments of various countries and industries such as automobiles, electric power, and energy have gradually attached importance to the development of fuel cell technology. Fuel cell is a new power generation technology with high efficiency, low pollution and diversified energy sources. ...

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Problems solved by technology

A hydroxyl group (OH) can be formed at the position of the Ru element, and the CO adsorbed on the platinum active site is oxidized to CO under the action of OH 2 and H 2 O, thereby eliminating the adsorption of CO and regaining the platinum active sites, however, reaction (5) is still the rate-determining step in the electrochemical oxidation of formic acid, and the enhanced reduction of platinum oxide is still the key factor to improve the performance of direct formic acid fuel cells

Moreover, on the surface of the limited carbon carrier, both the main catalyst and the co-catalyst must be loaded. Increasing the loading of the co-catalyst will inevitably lead to a decrease in the loading of the main catalyst, so the effects of the main catalyst and the co-catalyst cannot be maximized. Maximize

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