Enhancing hydrogen storage properties of the Mg/MgH2 system by the addition of bis(tricyclohexylphosphine)nickel(II) dichloride |
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| Affiliation: | 1. Univ Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, F-69626, Villeurbanne, France;2. LCC-CNRS, Université de Toulouse, CNRS, UPS, 205 Route de Narbonne, BP 44099, F-31077, Toulouse Cedex 4, France;1. School of Chemistry and Chemical Engineering, South China University of Technology; Guangdong Key Lab for Fuel Cell Technology, Guangzhou 510641, China;2. School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA 30332-0245, United States;1. School of Aeronautics, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, China;2. School of Energy and Power Engineering, Xi''an Jiaotong University, Xi''an, Shaanxi 710049, China;3. Unmanned Systems Research Institute, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, China;1. Department of Materials Science and Engineering, Sharif University of Technology, 14588 Tehran, Iran;2. Institute for Nanoscience and Nanotechnology, Sharif University of Technology, 14588 Tehran, Iran;3. Department of Engineering, Shahid Beheshti University, 1983963113 Tehran, Iran;4. Department of Physics, University of Isfahan, 81744 Isfahan, Iran;5. Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran;1. College of Materials Science and Engineering, Nanjing Tech University, 5 Xinmofan Road, Nanjing, 210009, PR China;2. Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, School of Mechanical Engineering, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, PR China;3. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing, 210009, PR China;1. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro Atómico Bariloche, Av. Bustillo, 9500, S.C. de Bariloche, Argentina;2. Centro Regional Universitario Bariloche, Universidad Nacional del Comahue, Quintral, 1250, S.C. de Bariloche, Argentina;3. Facultad de Ingeniería, Universidad Nacional de Cuyo, Centro Universitario, Mendoza, Argentina;4. Instituto Balseiro, Universidad Nacional de Cuyo, Av. Bustillo 9500, S.C. de Bariloche, Argentina |
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| Abstract: | This is a first report on the use of the bis(tricyclohexylphosphine)nickel (II) dichloride complex (abbreviated as NiPCy3) into MgH2 based hydrogen storage systems. Different composites were prepared by planetary ball-milling by doping MgH2 with (i) free tricyclohexylphosphine (PCy3) without or with nickel nanoparticles, (ii) different NiPCy3 contents (5–20 wt%) and (iii) nickel and iron nanoparticles with/without NiPCy3. The microstructural characterization of these composites before/after dehydrogenation was performed by TGA, XRD, NMR and SEM-EDX. Their hydrogen absorption/desorption kinetics were measured by TPD, DSC and PCT. All MgH2 composites showed much better dehydrogenation properties than the pure ball-milled MgH2. The hydrogen absorption/release kinetics of the Mg/MgH2 system were significantly enhanced by doping with only 5 wt% of NiPCy3 (0.42 wt% Ni); the mixture desorbed H2 starting at 220 °C and absorbed 6.2 wt% of H2 in 5 min at 200 °C under 30 bars of hydrogen. This remarkable storage performance was not preserved upon cycling due to the complex decomposition during the dehydrogenation process. The hydrogen storage properties of NiPCy3-MgH2 were improved and stabilized by the addition of Ni and Fe nanoparticles. The formed system released hydrogen at temperatures below 200 °C, absorbed 4 wt% of H2 in less than 5 min at 100 °C, and presented good reversible hydriding/dehydriding cycles. A study of the different storage systems leads to the conclusion that the NiPCy3 complex acts by restricting the crystal size growth of Mg/MgH2, catalyzing the H2 release, and homogeneously dispersing nickel over the Mg/MgH2 surface. |
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| Keywords: | Hydrogen storage Bis(tricyclohexylphosphine)nickel(II) dichloride complex Absorption Desorption Reversibility |
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