Abstract
Modern energy systems such as redox flow batteries (RFB) or biological fuel cells (BFC) are becoming increasingly popular in the specialist trade [1-5]. Despite a number of demonstrative tests and the increasing number of media representations [4-7], up to now the systems are cost-intensive and for some components like bipolar plates are only a few materials are usable like original carbon materials. So, the development and knowledge in processing of the components are essential for the economic efficiency of the systems. However, it is necessary to look at the surface structure of the materials as one of the parameters defined by different production methods and after-treatment. There are some measurement methods commercially available, which are tested on different samples and generate different values. It can be concluded that optical methods are more suitable than mechanical ones.
Highlights
In order to define the surface roughness, it is necessary to define the parameters
Despite a number of demonstrative tests and the increasing number of media representations [4,5,6,7], up to now the systems are cost-intensive and for some components like bipolar plates are only a few materials are usable like original carbon materials
It is necessary to look at the surface structure of the materials as one of the parameters defined by different production methods and after-treatment
Summary
In order to define the surface roughness, it is necessary to define the parameters. Common parameters are the arithmetic average called Ra and the average of maximum peak to valley height of profile called Rz. The arithmetic and averaged maximum peak height are looked for in order to describe the surface quality of graphite compound panels from different manufacturing and aftertreatment processes. The corresponding measurements are taken relatively locally so that either a wide range of measuring points or always the same points have to be checked in order to obtain comparable, meaningful results. The surface roughness has a significant impact to the contact resistivity of the graphite material to the connecting parts like electrodes [8]
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