Fuel cell catalyst layer on-line aging diagnosis method 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: 2022-01-11
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 in conjunction with the accompanying drawings and specific embodiments.
[0035] like figure 1 Shown, the present invention comprises the following steps:
[0036] 1) Measure the electrochemical impedance spectroscopy and electrochemical surface area parameters of a 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 0.6V voltage for 10 seconds, and 0.9V voltage for 30 seconds;
[0037] 2) According to the electrochemical impedance spectroscopy of the fuel cell at different aging stages, calculate the two-point impedance aging corresponding to all the frequency combinations of the electrochemical impedance spectroscopy in the preset low frequency range and the preset medium and high frequency r...
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The invention discloses a fuel cell catalyst layer online aging diagnosis method based on impedance aging characteristics. The method includes the following steps: measuring electrochemical impedance spectroscopy and electrochemical surface area parameters of the fuel cell in different aging stages; calculating two-point impedance aging characteristics corresponding to different frequency combinations in different frequency intervals in different aging stages of the current fuel cell; repeating the steps to obtain electrochemical surface area parameters and two-point impedance aging characteristics of each fuel cell in different aging stages; determining the optimal two-point impedance aging characteristics in different frequency intervals; forming a training set and training the model to obtain a trained aging diagnosis regression model; during online diagnosis, measuring and calculating the optimal two-point impedance aging characteristics of the to-be-diagnosed fuel cell, and performing diagnosis to obtain the predicted electrochemical surface area parameters, so that the aging state of the catalyst layer is judged. By means of the invention, accurate fuel cell aging diagnosis is realized, and reliable and durable operation is facilitated.
Description
technical field [0001] The invention belongs to the fuel cell application field and relates to an online aging diagnosis method for a fuel cell catalytic layer, and in particular 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 temporal and spatial 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, due to the actual use process, the catalytic layer of the proton exchange membrane fuel cell will experience 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 陈剑刘浩
Owner ZHEJIANG UNIV