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• W3029820768 abstract "In our previous peer-reviewed article, a three-step method is put forward for increasing the efficiency of activating a newly-built membrane electrode assembly (MEA). By changing the activation temperatures of each step of the three-step method, the fuel cell performance can be greatly improved when compared with a normal one-step activation method. In this article, a deep understanding of the internal mechanism of this three-step method is conducted. Both cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) are tested after each I–V test round of a step. Two indexes, i.e., resistance reducing rate and effective current generation of catalyst (ECGC), are put forward. By integrating these two indexes, it clearly shows that the three-step activation method includes two effects, i.e., pore digging effect and pore swelling effect, which dominates in Step 1 and Step 2 separately. Finally, a pore forming mechanism model is put forward, which explains that the pore digging effect helps to form more three-phase reaction points and the pore swelling effect helps the three-phase points to become more effective. The same model also explains why the electrochemical surface area (ECSA) decreases during Step 1 and Step 2." @default.
• W3029820768 created "2020-06-05" @default.
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• W3029820768 date "2021-01-01" @default.
• W3029820768 modified "2023-10-14" @default.
• W3029820768 title "Disclosure of the internal mechanism during activating a proton exchange membrane fuel cell based on the three-step activation method" @default.
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• W3029820768 doi "https://doi.org/10.1016/j.ijhydene.2020.04.280" @default.
• W3029820768 hasPublicationYear "2021" @default.
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