Characterization of membrane electrode assembly with hydrogen-hydrogen cell and ac-impedance spectroscopy: Part I. Experimental |
| |
| Authors: | Olli Himanen Tero Hottinen Ville Saarinen |
| |
| Affiliation: | a Helsinki University of Technology, Laboratory of Advanced Energy Systems, P.O. Box 2200, 02015 HUT, Finland
b Helsinki University of Technology, Laboratory of Physical Chemistry and Electrochemistry, P.O. Box 6100, 02015 HUT, Finland |
| |
| Abstract: | A measurement system based on a symmetrical hydrogen-hydrogen cell was developed and presented. The net water flux through and impedance of Gore™ Primea® Series 58 MEA were measured under different humidity conditions. An equivalent circuit approach was used to analyze impedance measurement data and the dependences of membrane conductivity and reaction kinetics on the humidity were obtained. Modeling work was found necessary to estimate the diffusion coefficient of water in the membrane, because humidity profile inside the cell was uneven and unknown during the net water flux measurements. Gas permeabilities of different cell components and water uptake of the MEA were measured to get parameter values for the modeling work. The actual modeling work was not conducted in this contribution, but is explained in Part II of this paper. |
| |
| Keywords: | PEMFC Hydrogen-hydrogen cell Water transport Hydraulic permeability Water uptake |
| 本文献已被 ScienceDirect 等数据库收录！ |
