We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
PEMFC 电化学氢泵活化方法 及其强化机制.
- Authors
戴海勤; 杨代军; 明平文; 李 冰; 张存满; 汪殿龙
- Abstract
Proton exchange membrane fuel cell (PEMFC) usually need an activation process to obtain its best electrochemical performance. Compared with the traditional activation methods, electrochemical hydrogen pump has the advantages of saving time and hydrogen cost. The electrochemical hydrogen pump is a method in which hydrogen is oxidized into protons at the anode, and the protons migrate to the cathode with an applied electric field, and then are reduced to hydrogen again. The performance, internal impedance and electrochemical specific area (ECSA) changes of PEMFC after electrochemical hydrogen pump activation were studied with the help of polarization curves, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) tests. Then the mechanism of the hydrogen pump activation was analyzed. Moreover, the influence of different current densities, inlet humidities and activation temperatures were investigated. The results show that after the hydrogen pump activation, the fuel cell performance is improved obviously, the slope of Tafel curve is decreased, the charge transfer resistance and mass transfer resistance get lower values, while the ohmic resistance is basically unchanged, and the ECSA is increased. Therefore, the mechanism of the hydrogen pump activation is related to the quantity of active species and microstructure of catalyst layer. The performance of hydrogen pump activation under 200 mA cm-2 is better than that of under 100 mA cm². The performance of hydrogen pump activation under the inlet humidity of 150% RH is better than that of 100% RH and 200% RH. In addition, the activation temperature has little impact on the PEMFC performance after hydrogen pump activation. and the fuel cell can be fully activated by hydrogen pump activation for 30 min at room temperature.
- Publication
Journal of Materials Engineering / Cailiao Gongcheng, 2023, Vol 51, Issue 6, p20
- ISSN
1001-4381
- Publication type
Article
- DOI
10.11868/j.issn.1001-4381.2021.000119