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Lototskyy M.V.,University of the Western Cape | Davids M.W.,University of the Western Cape | Tolj I.,University of the Western Cape | Klochko Y.V.,University of the Western Cape | And 5 more authors.
International Journal of Hydrogen Energy | Year: 2015

Metal Hydrides (MH) provide efficient hydrogen storage for various applications, including Low Temperature PEM Fuel Cells (LT PEMFCs), when system weight is not a major and critical issue. Endothermic dehydrogenation of MH leading to decreased rates of H2 evolution eliminates the risk of accidents even in the case of rupture of the hydrogen storage containment. At the same time, it poses a number of challenges related to the constant, stable and sufficient H2 supply for stable FC operation.This paper reviews recent efforts in MH hydrogen storage and supply systems for LT PEMFC applications, including the ones developed at HySA Systems/SAIAMC/University of the Western Cape. The systems are characterised by a series of hydrogen storage capacities ranging from 10NL to ~10Nm3H2 in turns providing stable operation for stationary and mobile FC power modules (from a few W to several kW). The MH systems use unstable hydride materials (equilibrium H2 pressure at ambient temperature around 10bar) that, in combination with special engineering solutions of MH containers (both liquid- and air-heated-cooled), and optimised system layout, facilitates H2 supply to LT PEMFC stacks. © 2015 Hydrogen Energy Publications, LLC. Source


Lototskyy M.V.,University of the Western Cape | Tolj I.,University of the Western Cape | Davids M.W.,University of the Western Cape | Klochko Y.V.,University of the Western Cape | And 5 more authors.
20th World Hydrogen Energy Conference, WHEC 2014 | Year: 2014

Metal Hydrides (MH) provide efficient hydrogen storage for various applications, including Low Temperature PEM Fuel Cells (LT PEMFCs), when system weight is not a major and critical issue. Endothermic dehydrogenation of MH leading to decreased rates of H2 evolution eliminates the risk of accidents even in the case of rupture of the hydrogen storage containment. At the same time, it poses a number of challenges related to the constant, stable and sufficient H2 supply for stable FC operation. This paper reviews recent efforts in MH hydrogen storage and supply systems for LT PEMFC applications, including the ones developed at HySA Systems / SAIAMC / University of the Western Cape. The systems are characterised by a series of hydrogen storage capacities ranging from 10 L to ∼10 m3 H2 STP in turns providing stable operation for stationary and mobile FC power modules (from a few W to several kW). The MH systems use unstable hydride materials (equilibrium H2 pressure at ambient temperature around 10 bar) that, in combination with special engineering solutions of MH containers (both liquid- And air-heated-cooled), and optimised system layout, facilitates H2 supply to LT PEMFC stacks. Copyright © (2014) by the Committee of WHEC2014 All rights reserved. Source


Lototskyy M.V.,University of the Western Cape | Tolj I.,University of the Western Cape | Tolj I.,University of Split | Davids M.W.,University of the Western Cape | And 10 more authors.
International Journal of Hydrogen Energy | Year: 2016

A novel hydrogen storage system for a RX60-30L 3-tonne electric forklift (STILL), equipped with a GenDrive 1600-80A fuel cell power module (Plug Power) has been developed. The system combines a compressed H2 composite cylinder (CGH2) and a liquid-heated-cooled metal hydride (MH) extension tank which is thermally integrated with a power module. The MH extension tank comprises a MH bed formed according to an advanced solution to provide easy activation of the MH material and fast H2 charge/discharge. The system has the same hydrogen storage capacity (∼19 Nm3 H2 or 1.7 kg) as the separate CGH2 tank charged at P = 350 bar, but at a lower H2 charge pressure (≤185 bar). A 15 min cycle refuelling provides the forklift with full-load operation (according to VDI-60 protocol) during >3 h, or 2 to 4 working shifts in a real industrial environment. The work also presents a hydrogen refuelling station (dispensing pressure up to 185 bar) with integrated MH compressor which has been developed for forklift refuelling. © 2016 Hydrogen Energy Publications, LLC. Source

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