Increasing the density of hydrogen storage is critical for the commercial introduction of hydrogen vehicles. Our nanostructured electrospun ammonia borane (AB)-polystyrene (PS) fibres hit the US DoE 2010 targets for storage capacity and H2 release rate. Previous AB-PS samples were insufficiently nanostructured to show the expected changes from the bulk, but our latest fibres show desorption kinetics 15x faster than bulk AB, and we would like to compare these samples with QENS data of pure AB thermolysis from a previous experiment. Using QENS and in-situ diffraction, in conjunction with INS, FTIR and DSC, and XRD, we hope to link the faster kinetics to H diffusion, and the AB fibres' nanostructural evolution, thus understanding the improvement in hydrogen storage properties and contributing to the commercial possibilities of these materials.