Alkali, alkaline earth and transition metal doped B6H6 complexes are considered for the hydrogen storage. Density functional theory (DFT) and second order Moller Plesset methods with 6-311++G** basis set have been used for the study. B6H6Li, B6H6Be, B6H6Sc, B6H6Li2, B6H6Be2, B6H6Sc2 complexes can interact with maximum three, two, four, six, four and eight H-2 molecules respectively with respective H-2 uptake capacity of 7.2, 4.8, 6.5, 12.5, 8.3 and 9.1 wt%. This uptake capacity is well above the target set by the U.S. Department of Energy by 2020 except for the B6H6Be complex. Thermo chemistry calculations are carried out to estimate the Gibbs free energy corrected H-2 adsorption energy which reveals whether adsorption of hydrogen on these complexes is favourable or not at different temperature. It is observed that H2 adsorption on all the six complexes are unfavourable at ambient conditions where as it is favourable below 150, 135, 75, and 50 K on B6H6Sc, B6H6Be, B6H6Li and B6H6Li2 complexes respectively. Various interaction energies in H-2 adsorbed complexes are obtained using Many-body analysis approach. The H-2 desorption temperature for the B6H6Li, B6H6Be, B6H6Sc, B6H6Li2, B6H6Be2 and B6H6Sc2 complexes is found to be 25, 165, 265, 10, 265 and 373 K respectively. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.