Ex-situ characterisation of gas diffusion layers for proton exchange membrane fuel cells

► This study focuses on generating important ex-situ GDL parameters. ► The paper highlights the various types of commercial GDLs and discusses their characteristic variations. ► The paper shows the relationship between several ex-situ GDL parameters. ► The study explores the effect of PTFE loading and MPL presence upon the ex-situ characteristics of the GDL. ► This study emphasizes the need of parameters optimisation in GDL design and fabrication.