On-line aging diagnosis method of fuel cell catalytic layer based on impedance aging characteristics
A fuel cell and diagnostic method technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of long time for electrochemical impedance spectroscopy measurement and the aging state of the catalytic layer of difficult fuel cells, and achieve the effect of reducing the burden of data storage
Active Publication Date: 2022-07-26
ZHEJIANG UNIV
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However, the measurement time of electrochemical impedance spectroscopy is also long and requires stable operating conditions. It is difficult to implement it online to reflect the aging state of the fuel cell catalytic layer, which has certain limitations.
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[0034] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0035] like figure 1 As shown, the present invention comprises the following steps:
[0036] 1) Measure the electrochemical impedance spectroscopy and electrochemical surface area parameters of the new proton exchange membrane fuel cell at different aging stages, such as figure 2 shown. In the specific implementation, the aging test cycle condition used is a voltage cycle condition with a total duration of 40 seconds, wherein the voltage cycle condition is specifically a voltage of 0.6V for 10 seconds, and a voltage of 0.9V for 30 seconds;
[0037] 2) According to the electrochemical impedance spectrum of the fuel cell in different aging stages, calculate the two-point impedance aging corresponding to all the electrochemical impedance spectrum frequency combinations in the preset low frequency interval and the preset middle and high frequency ...
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The invention discloses an on-line aging diagnosis method of a fuel cell catalytic layer based on impedance aging characteristics. Including: measuring the electrochemical impedance spectrum and electrochemical surface area parameters of the fuel cell in different aging stages; calculating the two-point impedance aging characteristics corresponding to different frequency combinations in different frequency ranges in different aging stages of the current fuel cell; repeating the steps to obtain each fuel cell The electrochemical surface area parameters and two-point impedance aging characteristics of the battery in different aging stages; determine the optimal two-point impedance aging characteristics in different frequency ranges; form a training set and train the model to obtain a trained aging diagnosis regression model; online diagnosis , measure and calculate the optimal two-point impedance aging characteristics of the fuel cell to be diagnosed, and obtain the predicted electrochemical surface area parameters after diagnosis, thereby judging the aging state of the catalytic layer. The invention realizes accurate fuel cell aging diagnosis, which is helpful for more reliable and durable operation.
Description
technical field [0001] The invention belongs to an on-line aging diagnosis method for a fuel cell catalytic layer in the field of fuel cell application, and particularly relates to an online aging diagnosis method for a fuel cell catalytic layer based on two-point impedance aging characteristics. Background technique [0002] The aging of the catalytic layer of proton exchange membrane fuel cells is a complex and strongly nonlinear process, involving complex factors such as multiple mechanisms, multiple physical domains, multiple spatiotemporal scales, multiple working conditions, and multiple couplings, making the aging state of the catalytic layer accurate and fast. It is estimated to be a huge challenge. In addition, in the actual use process, the catalytic layer of the proton exchange membrane fuel cell will experience the phenomenon of aging recovery after shutdown and restart due to factors such as water management, which further increases the difficulty of estimating ...
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IPC IPC(8): G01R31/392
CPCG01R31/392
Inventor 刘浩陈剑
Owner ZHEJIANG UNIV