Tropes

www.technology.org 2015 10902.txt.txt

#olecular spongeadvancement in storing hydrogen Researchers at the University of Bath have discovered that hydrogen absorbed in specialised carbon nanomaterials can achieve extraordinary storage densities at moderate temperatures and pressures. The research marks a major development in our understanding of efficient hydrogen storage. It was led by Dr Valeska Ting from University Department of Chemical engineering in conjunction with researchers from Rutherford Appleton Laboratory and collaborators in the USA and Germany. Sustainable, low-carbon fuel Hydrogen presents a significant opportunity as a sustainable, low-carbon alternative to fossil-based transport fuels. However, hydrogen is stored typically as a compressed gas in bulky high pressure tanks and these costly storage problems are a barrier to its use as a transport fuel of the future. The research which has been published in the prestigious journal ACS Nano, found that when hydrogen is stored in materials with optimally-sized subnanometer pores, it is able to be compressed simultaneously and stored at much higher densities than in conventional tanks. These materials include activated carbons, zeolites, metal-organic framework materials and certain porous polymers which act as olecular sponges Solid-like behaviour Using inelastic neutron scattering, which is one of the few experimental techniques that can be used to obtain direct information on the state of the hydrogen inside a solid material, the team observed hydrogen gas with a solid-like behaviour, indicating hydrogen densities almost 1, 000 times the density of gaseous hydrogen at ambient temperatures and pressures. Dr Ting said: reater understanding of how the nanoscale structure of the storage material can influence gas storage capacities is expected to lead to more accurate evaluation methods for existing porous hydrogen storage materials. This, in turn, should have an impact on the design and evaluation of new hydrogen storage materials for future automotive applications. Shift in focus These findings open the door to a shift in focus towards pore design with future research looking to exploit storing high density hydrogen in solid materials, rather than as a liquid or a gas q

< Back - Next >