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Browsing by Author "Langmi, Henrietta W"

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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
Challenges in hydrogen RCS' stakeholder engagement in South Africa

Author: North, Brian C ; Langmi, Henrietta W ; Swartbooi, Ashton M Date: Sep 2019 There is a great deal of knowledge and experience on the safe handling of hydrogen, and the safe operation and management of hydrogen systems in South Africa. This knowledge and experience mostly sits within large gas supply companies and ... Read more
Clay and clay-supported materials for clean energy storage applications

Author: Musyoka, Nicholas M ; Langmi, Henrietta W Date: 2015 The dwindling fossil energy reserves together with the need to find cleaner energy sources have intensified investigations for alternative energy sources. Solar energy, batteries and hydrogen have featured prominently amongst the most promising ... Read more
Compaction of a zirconium metal–organic framework (UiO-66) for high density hydrogen storage applications

Author: Bambalaza, Sonwabo E ; Langmi, Henrietta W ; Mokaya, R ; Musyoka, Nicholas M ; Ren, Jianwei ; Khotseng, LE Date: Nov 2018 We report a rare case whereby a metal–organic framework (MOF), namely UiO-66, is compacted at high pressure (700 MPa or 100 000 psi) resulting in densification and improved total volumetric hydrogen storage capacity, but crucially, without ... 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
Current research trends and perspectives on materials-based hydrogen storage solutions: A critical review

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Langmi, Henrietta W ; Mathe, Mahlanyane K ; Liao, S Date: Jan 2016 Effective hydrogen storage solutions have been pursued for decades, and materials-based hydrogen storage is a research frontier of much current interest. Yet, no researched materials to date have come close to the DOE 2020 targets for hydrogen ... 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
Development of hydrogen storage technologies

Author: Langmi, Henrietta W Date: Oct 2015 The use of hydrogen to deliver energy for cars, portable devices and buildings is seen as one of the key steps to reduce greenhouse gas emissions. South Africa’s national hydrogen strategy, HySA, aims to develop and guide innovation along 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 MOF nanofibers as hydrogen storage media

Author: Ren, Jianwei ; Musyoka, Nicholas M ; Annamalai, P ; Langmi, Henrietta W ; North, Brian C ; Mathe, Mahlanyane K Date: Jun 2015 In this study, Zr-MOF and Cr-MOF were chosen as representatives of the developed MOFs in our laboratory and were incorporated into electrospun nanofibers. The obtained MOF nanofibers composites were evaluated as hydrogen storage media. The ... 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
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
Feasibility of varied polyethylene terephthalate wastes as a linker source in metal-organic framework UiO-66(Zr) synthesis

Author: Dyosiba, Xoliswa L ; Musyoka, Nicholas M ; Langmi, Henrietta W ; Ren, Jianwei ; Mathe, Mahlanyane K ; Onyango, MS Date: Aug 2019 Polyethylene terephthalate (PET), a chemically stable polyester with multiple applications, has risen dramatically in manufacturing and consumption in the past decades. The increase in PET use has resulted in considerable volumes of waste PET ... 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

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