Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6604393 | Electrochimica Acta | 2018 | 9 Pages |
Abstract
This paper investigates the influence of the cell compression of a PEM water electrolysis cell. A small single cell is therefore electrochemically analyzed by means of polarization behavior and impedance spectroscopy throughout a range of currents (0.01â¯Aâ¯cmâ2 to 2.0â¯Aâ¯cmâ2) at two temperatures (60°C and 80°C) and eight compressions (0.77â¯MPa-3.45â¯MPa). Additionally, a computational model is utilized to support the analysis. The main findings are that cell compression has a positive effect on overall cell performance due to decreased contact resistances, but is subject to optimization. In this case, no signs of severe mass transport problems due to crushed transport layers are visible in either polarization curves or impedance plots, even at high currents. However, a Tafel plot analysis revealed more than one slope throughout the current range. The change in the Tafel slope is therefore discussed and connected to the electrochemical reaction or an ohmic contribution from a non-electrode component.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Steffen Henrik Frensch, Anders Christian Olesen, Samuel Simon Araya, Søren Knudsen Kær,