Development of hydrogen storage technologies Henrietta Langmi.

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Presentation transcript:

Development of hydrogen storage technologies Henrietta Langmi

Outline Context South African energy profile Hydrogen energy Hydrogen South Africa (HySA ) Brief introduction Hydrogen storage Background Research

Coal supplies 72% of South Africa’s primary energy and 90% of its electricity requirements Sources: South African energy profile CO 2 emissions in thousands of tonnes per annum, via burning of fossil fuels SA 2013 CO 2 emissions: Annual: kt Per capita: 6.2 t Total primary energy consumption (2013)

Can hydrogen help? Hydrogen + Oxygen → Water + Energy H 2(g) + ½ O 2(g) → H 2 O + E High energy content and clean Abundant 3 rd most common element on earth’s surface Water (H 2 O), fossil fuels (–CH x ), biomass (–CH y O z ) Source: T. Mays, h2fcsupergen E = 120 – 142 MJ kg -1 heat (combustion) = 1.23 V electrical potential + 24 MJ kg -1 heat (fuel cell) + (40 – 55 MJ kg -1 for combustion of hydrocarbons; CO 2 emitted)

Hydrogen energy chain Fossil fuels Biomass Water splitting Cylinders Cryogenic tanks Pipelines Chemical compounds Compressed Liquefied Materials Liquid carriers Combustion Fuel cells Transport Stationary Portable Storage Conversion ApplicationProduction Delivery

Natural resources in South Africa Annual 24 h global solar irradiation average exceeds values in Europe, Russia, and most of North America South Africa’s solar potential South Africa has nearly 80% of the world’s platinum group metals (PGMs)

Hydrogen South Africa (HySA) “To create knowledge and human resource capacity that will develop high-value commercial activities in H&FC technologies utilising local resources and existing know-how”

The hydrogen storage challenge Hydrogen: Lightest element, lowest density Strong covalent bond Low polarisation ability → Weak interaction between H 2 molecules At room temp and atm pressure: 5 kg H 2 occupies vessel of ≈ 5 m diameter (5 kg H 2 gives 500 km driving range) ~10 –13 cm ~10 –8 cm 3*10 –8 cm

Hydrogen storage options Materials-based storage LaNi 5 H 6 MgH 2 NaAlH 4 LiNH 2 LiBH 4 NH 3 BH 3 LOHC NH 3 HCOOH Liquid chemical carriers

Hydrogen storage CSIR High pressure composite cylinders Chemical carriers (formic acid) Porous materials (MOFs, Carbon)

High pressure composite cylinders To develop enhanced materials and manufacturing methods to improve the characteristics of hydrogen storage tanks Composite = Carbon fibre + resin + fillers Resin modification (improve mechanical properties) Finite element modelling (design capabilities) Epoxy CNT/epoxy

Chemical carriers – formic acid Decomposition of formic acid Technology gaps Catalyst Reactor

Metal-organic frameworks (MOFs) Beneficiation (Cr, Zr, PGMs) Cost saving (cheaper solvents/reagents) Environmentally friendly (water as solvent) High stability (thermal, air, moisture) Zn-MOF Cr-MOF Zr-MOF Several MOFs are being developed

Metal-organic frameworks (MOFs) High thermal stability Good moisture stability Comparable H 2 storage capacity Int. J. Hydrogen Energy 39, 2014, 890; Int. J. Mat. Res. 105, 2014, 516; Int. J. Hydrogen Energy 39, 2014,12018; Int. J. Hydrogen Energy 39, 2014, 14912; Int. J. Hydrogen Energy, 40, 2015, 10542; Materials Today: Proceedings, 2, 2015, Some MOF materials developed in our laboratory MOF sample (solvent) Size of crystals S BET (m 2 ·g -1 ) Pore vol. (cm 3 ·g -1 ) Thermal stability (°C) Moisture stability H 2 uptake (wt.%) 77 K, 1 bar Zr-fum MOF (H 2 O)200 nm good1.4 MOF-5 (DMF)5-100 µm poor1.4 MOF-69c (DMF)5-100 µm poor1.9 Zr-MOF (DMF) nm good1.5 Cr-MOF (H 2 O) nm good1.9 (DMF) nm good2.4

Carbon nanostructures (CNS) Templated carbons Conventional feedstocks Unconventional feedstocks MOF derived carbons Graphene Activated carbon Recrystallization to zeolites TemplatingProcess Clay Coal fly ash Zeolite A Zeolite X Templated carbon Highly ordered pore structure Beneficiation (fly ash, clay) Cost saving (waste feedstocks) Several CNS are being developed Int. J. Hydrogen Energy 40, 2015, 9382Int. J. Energy Res , 494.

Carbon nanostructures: modifications Modifications – PGMs and Li-doping

MOF / Carbon composites Beneficial towards practical applications Enhanced H 2 storage capacity Enhanced thermal conductivity Enhanced bulk density MOF / Templated carbon MOF / Graphene MOF / Carbon composite Templated carbon Cr-MOF Hydrogen storage Res. Chem. Intermed. 2015, In press

Powder shaping: electrospinning Transition from lab to applications Application-oriented shapes Other attractive properties High surface areas Hierarchical pores MOF electrospun fibres MOF/polymer solutionElectrospinning set-up Int. J. Hydrogen Energy 40, 2015, 9382

Powder shaping: granulation From lab to applications Application-oriented shapes Int. J. Hydrogen Energy 40, 2015, 4617 MOF powder Compact durability

Summary Hydrogen is potentially a good alternative to fossil-based fuels Hydrogen storage presents a major challenge HySA Infrastructure is developing attractive and competitive hydrogen storage options for practical applications Key considerations are hydrogen storage properties, beneficiation, cost, environment

Dream? Vision? Reality? “…I believe that water will one day be employed as fuel, that hydrogen and oxygen which constitute it, used singly or together, will furnish an inexhaustible source of heat and light … Water will be the coal of the future....” Jules Verne, The Mysterious Island, 1874 Water + Energy → Hydrogen + Oxygen → Water + Energy J.A. Turner et al., Electrochem. Soc. Interface 13, 2004, 24.

Acknowledgements HySA Infrastructure Team (CSIR, NWU, DST) Host InstitutionsFinancial Support

Thank you