Oxidation current type sensor for measuring methanol concentration and calculation method of oxidation current type sensor

Abstract

The invention discloses an electrochemical sensor for measuring methanol concentration. According to the electrochemical sensor, a reference electrode is introduced, so that the accuracy of sensor test can be improved; a water storage tank is introduced, so that a proton exchange membrane can be moisturized, and the stability of membrane electrode test can be ensured; the diameter of a methanol flow channel is limited, so that the influence of methanol and carbon dioxide bubbles on the performance of a membrane electrode is eliminated, and the stability of the oxidation current type sensor is improved; meanwhile, the function relation among the temperature, the current and the methanol concentration in the model is obtained and can also be used for temperature effect correction of other electrochemical sensors, and the problem that an existing function relation is inaccurate is solved. Application tests show that the sensor can be used for accurately monitoring methanol concentration under the DMFCs application level.

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 metho

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