Catalytic and direct synthesis of a neutral hydrogen peroxide solution from O-2 and H-2 was studied using a new conceptual PEMFC reactor with a new active cathode. A particular electrocatalyst of Co-TPP/vapor-grown-carbon-fiber (VGCF) heat-treated in He at 1073 K was found for two electrons reduction of O-2. The most active and efficient cathode was 0.05 wt.% Co-TPP/VGCF (2 mg cm(-2)) coated on the VGCF base electrode. The maximum concentration of 13.5 wt.% was obtained with 42% CE at 278 K. (C) 2011 Elsevier B.V. All rights reserved.