An oxidation amperometric sensor for measuring methanol concentration and its calculation method

Abstract

The invention discloses an electrochemical sensor for measuring methanol concentration. The electrochemical sensor improves the accuracy of sensor testing by introducing a reference electrode, and moisturizes the proton exchange membrane by introducing a water storage tank to ensure The stability of the membrane electrode test; by limiting the diameter of the methanol flow channel, the influence of methanol and carbon dioxide bubbles on the performance of the membrane electrode is eliminated, and the stability of the oxidation current sensor is further improved. At the same time, the functional relationship between temperature, current and methanol concentration in the model is also obtained. This relationship can also be used for temperature effect correction of other electrochemical sensors, which solves the problem of inaccurate functional relationship. Application tests show that the sensor can be used for precise monitoring of methanol concentration at the application level of DMFCs.

Description

technical field [0001] The invention relates to the field of chemical sensors, in particular to an oxidation current sensor for measuring methanol concentration and a measuring method thereof. Background technique [0002] Direct methanol fuel cells (DMFCs) are considered to be the most potential power sources in future portable devices, military applications, small vehicles, emergency auxiliary power sources due to their high energy density, low emissions, system simplicity, environmental protection, and the comfort of using liquid fuels One of the alternatives. However, the transition of methanol from the anode to the cathode, especially for fuels with high concentrations of methanol, leads to a decrease in the cathode potential and energy efficiency. DMFCs require a dilute methanol solution, usually less than 2M, to reduce the permeation of methanol through the membrane to the cathode. It would also result in a low energy density, large and heavy system. To maintain ef...

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Problems solved by technology

[0005] In order to solve the problems of long-term operation stability of the sensor, bubble disturbance and temperature correction under high temperature conditions, the present invention develops an oxidation current electrochemical sensor and its calculation method for measuring methanol concentration, by introducing a reference electrode , Optimizing the methanol flow channel and introducing water storage tanks and other measures to improve the long-term operation stability and anti-bubble interference ability of the sensor

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