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Browsing by Subject "Hydrogen storage"

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Advanced hydrogen technologies for FC applications and PGM beneficiation in SA: Presentation

Author: Langmi, Henrietta W ; Bessarabov, D Date: Mar 2013 This presentation discusses the R&D activities at HySA Infrastructure (CSIR and NWU). The mission of HySA Infrastructure is to deliver technologies for hydrogen production (linked to renewable energy), storage and distribution. The scope ... Read more
A comparison of hydrogen storage capacity of commercial and fly ash-derived zeolite X together with their respective templated carbon derivatives

Author: Musyoka, Nicholas M ; Ren, Jianwei ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K Date: Oct 2015 This paper presents comparative results of structural, morphological and hydrogen sorption properties between commercial and fly ash-derived zeolite X including their respective templated carbon derivatives. The surface area of commercial ... Read more
Comparison of MOF-5- and Cr-MOF-derived carbons for hydrogen storage application

Author: Segakweng, T ; Musyoka, Nicholas M ; Ren, Jianwei ; Crouse, P ; Langmi, Henrietta W Date: Nov 2015 Nanoporous carbons which possess high surface areas and narrow pore size distributions have become one of the most important classes of porous materials with potential to be utilized for hydrogen storage. In recent times, several metal–organic ... Read more
Development of functional metal-organic frameworks (MOFs) for storing hydrogen in para form

Author: Ren, Jianwei ; Dyosiba, Xoliswa L ; Musyoka, Nicholas M ; Langmi, Henrietta W ; Mathe, Mahlanyane K Date: Dec 2016 In this work, enrichment of para-hydrogen is performed by flowing ultra-purity hydrogen gas at low temperature (77K) in the presence of a developed catalyst anchored in a MOF hybrid material. This approach fits within the bigger scope of the ... Read more
Effect of inclusion of MOF-polymer composite onto a carbon foam material for hydrogen storage application

Author: Molefe, Lerato Y ; Musyoka, Nicholas M ; Ren, Jianwei ; Langmi, Henrietta W ; Mathe, Mahlanyane K ; Ndungu, PG Date: Aug 2020 Despite the extensive studies done on the remarkable characteristics of metal–organic frameworks (MOFs) for gas storage applications, several issues still preclude their widespread commercial lightweight applications. In most cases, MOF ... Read more
Electrospun zeolite-templated carbon composite fibres for hydrogen storage applications

Author: Annamalai, Perushini ; Musyoka, Nicholas M ; Ren, Jianwei ; Langmi, Henrietta W ; Mathe, Mahlanyane K ; Bessarabov, D ; Petrik, LF Date: Jan 2017 The current study explored the application of the electrospinning technique to produce multi-hierarchical composites for hydrogen storage applications. Predetermined control of fibre porosity is expected to enable production of well-defined ... Read more
Experimental demonstration of dynamic temperature-dependent behavior of UiO-66 metal-organic framework: Compaction of hydroxylated and dehydroxylated forms of UiO-66 for high-pressure hydrogen storage

Author: Bambalaza, Sonwabo E ; Langmi, HW ; Mokaya, R ; Musyoka, Nicholas M ; Khotseng, LE Date: May 2020 High-pressure (700 MPa or ∼100 000 psi) compaction of dehydroxylated and hydroxylated UiO-66 for H2 storage applications is reported. The dehydroxylation reaction was found to occur between 150 and 300 °C. The H2 uptake capacity of powdered ... Read more
Fabrication of core-shell MIL-101(Cr)@UiO-66(Zr) nanocrystals for hydrogen storage

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K ; Kang, X Date: Sep 2014 The fabrication of coreeshell nanocrystals by incorporating microporous UiO-66 into mesoporous MIL-101 is reported. The growth of the coreeshell MIL-101@UiO-66 nanocrystals was observed and supported by TEM and PXRD. The accessible pore volumes ... Read more
Green synthesis of chromium-based metal-organic framework (Cr-MOF) from waste polyethylene terephthalate (PET) bottles for hydrogen storage applications

Author: Ren, Jianwei ; Dyosiba, Xoliswa L ; Musyoka, Nicholas M ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K ; Onyango, MS Date: Oct 2016 It is of great economic value to produce high-value PET-based MOF materials by the veritable elimination of waste PET, and provide sufficient MOF materials for hydrogen storage applications. Consequently, this work demonstrates the use of ... Read more
Hydrogen Storage Activities at HySA from (Nano)materials to Systems

Author: Langmi, Henrietta W ; North, Brian C ; Bessarabov, D ; Lototskyy, M ; Williams, M ; Pollet, BG Date: Nov 2012 One of HySA’s missions is to deliver technologies for hydrogen storage infrastructure that meet the set cost targets and provide the best balance of safety, reliability, robustness, quality and functionality. HySA aims to develop storage and ... Read more
Hydrogen storage for fuel cell applications: Challenges, opportunities and prospects for metal-organic frameworks

Author: Langmi, Henrietta W ; Bessarabov, D Date: Jul 2013 Safe, efficient hydrogen storage and distribution is widely regarded as one of the major challenges facing the transition to the Hydrogen Economy. Conventionally, hydrogen is stored as compressed gas or cryogenically as a liquid. In order to ... Read more
Hydrogen storage in metal-organic frameworks: A review

Author: Langmi, Henrietta W ; Ren, Jianwei ; North, Brian C ; Mathe, Mahlanyane K ; Bessarabov, D Date: May 2014 Metal-organic frameworks (MOFs) for hydrogen storage have continued to receive intense interest over the past decade. MOFs are a class of organic-inorganic hybrid crystalline materials consisting of metallic moieties that are linked by strong ... Read more
Hydrogen Storage: Preparation, Applications and Technology

Author: Langmi, Henrietta W Date: Aug 2018 The lack of safe, reliable and efficient hydrogen storage systems remains one of the key obstacles to the hydrogen economy. Amide-hydride systems are a promising class of hydrogen storage materials particularly for vehicular applications. ... Read more
HySA infrastructure center of competence: A strategic collaboration platform for renewable hydrogen production and storage for fuel cell telecom applications

Author: Bessarabov, D ; Human, G ; Chiuta, S ; Van Niekerk, F ; De Beer, D ; Malan, H ; Grobler, LJ ; Langmi, Henrietta W ; North, Brian C ; Mudaly, D ; Mathe, Mahlanyane K Date: Sep 2014 The Department of Science and Technology of South Africa developed the National Hydrogen and Fuel Cells Technologies (HFCT) Research, Development and Innovation Strategy. The National Strategy was branded Hydrogen South Africa (HySA). HySA ... Read more
Metal–organic frameworks for hydrogen storage

Author: Langmi, Henrietta W ; Ren, Jianwei ; Musyoka, Nicholas M Date: Aug 2015 Over the past decade, hydrogen storage in metal-organic frameworks (MOFs) has received increasing attention worldwide because they possess versatile structures, high surface areas, large free volumes, ultrahigh porosities, and tunable pore ... Read more
Microwave-assisted modulated synthesis of zirconium-based metal–organic framework (Zr-MOF) for hydrogen storage applications

Author: Ren, Jianwei ; Segakweng, T ; Langmi, Henrietta W ; Musyoka, Nicholas M ; North, Brian C ; Mathe, Mahlanyane K ; Bessarabov, D Date: May 2014 Zirconium-based metal–organic framework (Zr-MOF) was synthesized using a microwave-assisted modulated method in a short reaction time of 5 min. The Zr-MOF material was highly crystalline with well-defined octahedral shaped crystals, and it ... Read more
Modeling hydrogen storage in boron-substituted graphene decorated with potassium metal atoms

Author: Tokarev, A ; Avdeenkov, AV ; Langmi, Henrietta W ; Bessarabov, DG Date: Mar 2015 Boron-substituted graphene decorated with potassium metal atoms was considered as a novel material for hydrogen storage. Density functional theory calculations were used to model key properties of the material, such as geometry, hydrogen ... Read more
Modulated synthesis of chromium-based metal-organic framework (MIL-101) with enhanced hydrogen uptake

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Langmi, Henrietta W ; Segakweng, T ; North, Brian C ; Mathe, Mahlanyane K ; Kang, X Date: Aug 2014 Modulated synthesis of MIL-101(Cr) in high yield and with good reproducibility using formic acid as a modulator is reported. Higher molar ratio of formic acid/CrCl(sub3) was found to form better shape-defined MIL-101(Cr) crystals with higher ... Read more
Modulated synthesis of zirconium-metal organic framework (Zr-MOF) for hydrogen storage applications

Author: Ren, Jianwei ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K ; Bessarabov, D Date: Jan 2014 A modulated synthesis of Zr-metal organic framework (Zr-MOF) with improved ease of handling and decreased reaction time is reported to yield highly crystalline Zr-MOF with well-defined octahedral shaped crystals for practical hydrogen storage ... Read more
A more efficient way to shape metal-organic framework (MOF) powder materials for hydrogen storage applications

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Langmi, Henrietta W ; Swartbooi, Ashton M ; North, Brian C ; Mathe, Mahlanyane K Date: Apr 2015 Shaping of Zr-MOF powder material into spherical pellets with diameters of 0.5–15 mm in the presence of 10 wt.% sucrose as a binder was successfully demonstrated using a granulator. Zr-MOF pellets were produced in a kilogram batch within 30 ... Read more

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