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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Nanocomposites IV: Nanoscience for Renewable Energy
Presentation Title Surface-Functionalized Nanoporous Carbons for Kinetically Stabilized Complex Hydrides through Lewis acid-Lewis base Chemistry
Author(s) Christopher L. Carr, Eric H. Majzoub
On-Site Speaker (Planned) Christopher L. Carr
Abstract Scope Complex metal hydrides are an attractive hydrogen storage option due to their high gravimetric capacities, but the re/de-hydriding reactions generally possess unfavorable thermodynamics and kinetics. Recent studies have attempted to alter these properties through confinement of complex hydrides in nanoporous substrates (e.g. LiBH4 melt-infiltrated into a nanoporous carbon). We present results of the surface functionality displayed by incorporation of electron-donating nitrogen into a nanoporous carbon. Pyridinic nitrogen in the substrate, confirmed by XPS, acts as a Lewis base. Our results indicate partial decomposition on melt-infiltration of LiBH4 may produce electron-accepting BH3 defects at the surface of the hydride forming a stabilizing capping layer. Although LiBH4 is already too stable for on-board hydrogen storage applications, it provides a well-characterized system for application of our concept. This ‘kinetic stabilization’ may provide a useful approach to using a wide class of complex hydrides with enthalpies below 15 kJ/mol H2.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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