Fuel cell carbon corrosion online diagnosis method based on carbon capacitance analysis
A technology of fuel cells and diagnostic methods, which is applied in the direction of fuel cells, circuits, electrical components, etc., can solve the problems of mutual influence of platinum capacitors, difficulty in distinguishing, and difficulty in responding to carbon carrier corrosion in capacitors, so as to improve rapidity and sensitivity. Conducive to the effect of early warning treatment
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Embodiment 1
[0047]Step 1) select conventional fuel cell, carry out cyclic voltammetry test to conventional fuel cell, determine the electric double layer capacitance region of conventional fuel cell, then carry out AC impedance test to conventional fuel cell, obtain the total effective electric double layer capacitance of conventional fuel cell ;
[0048] Step 2) taking the platinum-free fuel cell as a comparison, under the same operating conditions as step 1), measure the total effective double-layer capacitance of the platinum-free fuel cell;
[0049] Based on the total effective electric double layer capacitance of the conventional fuel cell and the platinum-free fuel cell, the platinum capacitance of the conventional fuel cell is obtained, and the platinum capacitance per unit area of the conventional fuel cell is further calculated;
[0050] Step 3) Using the CO adsorption and desorption method to demonstrate the invariance of the platinum capacitance per unit area before and after...
Embodiment 2
[0058] Step 1) select conventional fuel cell, carry out cyclic voltammetry test to conventional fuel cell, determine the electric double layer capacitance region of conventional fuel cell, then carry out AC impedance test to conventional fuel cell, obtain the total effective electric double layer capacitance of conventional fuel cell ;
[0059] Specifically: carry out cyclic voltammetry test on conventional fuel cell, determine the electric double layer capacitance region of conventional fuel cell; Select the corresponding voltage based on the electric double layer capacitance region of conventional fuel cell, use this voltage to carry out AC impedance test, and The total effective electric double layer capacitance of the conventional fuel cell is obtained by using the equivalent circuit model analysis.
[0060] Step 2) taking the platinum-free fuel cell as a comparison, under the same operating conditions as step 1), measure the total effective double-layer capacitance of the...
Embodiment 3
[0071] Except for the following content, all the other contents are the same as in Example 2.
[0072] The degree of carbon corrosion of the fuel cell is evaluated in combination with the increment of carbon oxidation capacity in the fuel cell to be tested. The specific process is as follows:
[0073] When the carbon capacitance of the fuel cell to be tested is greater than 10% of the carbon capacitance of the standard fuel cell, and the oxidation capacitance increase of carbon in the fuel cell to be tested is less than 2±0.2mF·cm -2 , while the coverage ratio of the polymer on the carbon surface is less than 1, the fuel cell to be tested is in the first stage of carbon corrosion. At this time, it is recommended that the intake humidity of the fuel cell be lower than a given value;
[0074] When the carbon capacitance of the fuel cell to be tested is greater than 10% of the carbon capacitance of the standard fuel cell, and the oxidation capacitance increment of carbon in the f...
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