Electrochemical sensor applied to direct methanol fuel cell as well as preparation method and application thereof

Abstract

The invention provides a catalyst carrier applied to a direct methanol fuel cell, and also provides an electrochemical sensor applied to the direct methanol fuel cell. A cleaned substrate electrode isput into the catalyst carrier prepared by using the method to carry out electro-deposition, and then is put into a potassium hexachloroplatinate aqueous solution to carry out electro-deposition to obtain a final product. According to the method disclosed by the invention, graphene oxide and polyethyleneimine are doped to form an intercalated composite material so as to obtain the catalyst carrier, and the catalyst carrier is deposited on the surface of a glass carbon electrode, a catalyst platinum is subjected to electro-deposition to obtain the electrochemical sensor; catalytic oxidation reaction on methanol is carried out by adopting a tri-electrode system, and thus, the catalysis effect is obvious. The methanol solutions with different concentrations are detected by using the electrode, a result shows that the catalytic oxidation peak height and the concentration of the methanol appear a linear reaction, and the linearity is good when the concentration of the methanol is between 0.02M and 2.0M, and R2 is equal to 0.996. The catalyst carrier can be used as the electrochemical sensor for detecting the methanol in the solution.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to an electrochemical sensor for direct alcohol fuel cells and its preparation method and application. Background technique [0002] Direct Alcohol Fuel Cell (DAFC) is a kind of proton exchange membrane fuel cell, which uses alcohol directly without reforming in advance. Alcohols are converted at the cathode to carbon dioxide and hydrogen ions, which then react with oxygen. DAFC has broad prospects in the energy field due to its characteristics of zero pollution, wide range of fuel sources, high energy density, fast conversion rate, low operating temperature, easy storage, and convenient transportation. The traditional noble metal catalyst, platinum (Pt), is expensive and easily deactivated, which seriously hinders the development of DMFC. Excellent catalyst support can reduce the amount of precious metals and improve catalyst activity, which is one of the imp...

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Problems solved by technology

There are many literature reports on Pt / GO composite materials as fuel cell catalysts, but most of the materials have poor uniformity, poor dispersion of Pt nanoparticles, and wide particle size range, which limit the ability of catalysts to catalyze methanol oxidation.

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