In this study, fiber-shaped cobalt (Co-fiber) was electroplated on the copper surface and modified with various amounts of gold nanoparticles (denoted as AuCofiber/Cu) with the aim to use it as the anode material in direct NaBH4-H2O2 (DBHPFC) and N2H4-H2O2 (DHHPFC) fuel cells. The galvanic displacement technique has been used for the deposition of Au nanoparticles onto the Co-fiber surface. The AuCofiber/Cu catalysts were prepared with the Au loadings in the range of 10.9-84.4 mu g(Au) cm(-2). Single fuel cell tests were performed by employing the prepared Co-fiber/Cu and different AuCofiber/Cu catalysts as the anode and a Pt sheet as the cathode. It was found that the peak power densities up to 162 mW cm(-2) for DHHPFC and 188 mW cm(-2) for DBHPFC were obtained at a temperature of 25 degrees C using the AuCofiber/Cu catalyst with the Au loading of 84.4 mu g(Au)cm(-2) as the anode. The highest specific peak power density values of 12018 mW mg(Au)(-1) for DHHPFC and 14954 mW mg(Au)(-1) for DBHPFC were obtained, when employing the AuCofiber/Cu catalyst with the lowest Au loading of 10.9 mu g(Au) cm(-2) as the anode material. (C) The Author(s) 2018. Published by ECS.