Pyrolyzed chicken feather fibers (PCFF) that were prepared by two-step process (215 degrees C/15 h + 400-450 degrees C/1 h) demonstrated a significant H(2) adsorption uptake due to their microporous nature. Considering their large availability, cost and H(2) storage capability, PCFF can be a significant, environmentally friendly and bio-renewable candidate to address the H(2) storage problem. A wide range of microporosities was obtained when the second step pyrolysis temperature was maintained between 400 and 450 degrees C for 0.5-2 h. The optimal H(2) storage was obtained using 1 h pyrolysis in this temperature range. The maximum excess H(2) storage capacity was 1.5 wt% at 77 K and at pressures below 2 MPa. The notable H(2) adsorption of PCFF below 1 MPa can be justified by the abundance of microporosity, and the nanopores available for H(2) penetration. The estimated adsorption energy for PCFFs, 5-6 kJ/mol was in the range of typical physisorption materials indicating the easy recovery of H(2). Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.