We report on an easy synthesis method for the preparation of a hybrid composite of Pt loaded MWCNTs@MOF 5 [Zn(4)O(benzene 14 dicarboxylate)(3)] that greatly enhanced hydrogen storage capacity at room temperature To prepare the composite we first prepared Pt loaded MWCNTs which were then incorporated in situ into the MOF 5 crystals The obtained composite was characterized by various techniques such as powder X ray diffractometry optical microscopy porosimetry by nitrogen adsorption and hydrogen adsorption The analyses confirmed that the product has a highly crystalline structure with a Langmuir specific surface area of over 2000 m(2)/g The hybrid composite was shown to have a hydrogen storage capacity of 1 25 wt% at room temperature and 100 bar and 1 89 wt% at cryogenic temperature and 1 bar These H(2) storage capacities represent significant increases over those of virgin MOF 5s and Pt loaded MWCNTs (C) 2010 Professor T Nejat Veziroglu Published by Elsevier Ltd All rights reserved