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In-situ grown carbon nanotubes on carbon paper as an integrated GDL for PEMFCs was fabricated by a chemical vapor deposition process.A series of GDLs with different featureswas obtained by varying growth time from 10 to 55min.The characteristics of the GDL samples involving morphology,contact angle,gas permeability,pore size distribution,through-plane electricalconductivity,in-plane electrical conductivity were evaluated and fuel cell performance of the GDLs was measured by a single cell test with hydrogen/oxygen.