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Browsing by Author "Khotseng, LE"

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Co-pelletization of a zirconium-based metalorganic framework (UiO-66) with polymer nanofibers for improved useable capacity in hydrogen storage

Author: Bambalaza, Sonwabo E ; Langmi, HW ; Mokaya, R ; Musyoka, Nicholas M ; Khotseng, LE Date: Dec 2020 We report on a concept of co-pelletization using mechanically robust hydroxylated UiO-66 to develop a metal-organic framework (MOF) monolith that contains 5 wt% electrospun polymer nanofibers, and consists of an architecture with alternating ... 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
Electro-deposition of Pd on carbon paper and Ni foam via surface limited redox-replacement reaction for oxygen reduction reaction

Author: Modibedi, Remegia M ; Mathe, Mahlanyane K ; Motsoeneng, RG ; Khotseng, LE ; Ozoemena, KI ; Louw, EK Date: May 2014 Pd nanostructured catalysts were electrodeposited by surface-limited redox replacement reactions usingthe electrochemical atomic layer deposition technique. Carbon paper and Ni foam were used as substratesfor the electrodeposition of the ... Read more
Electrochemical deposition of PdBiSn catalyst for glycerol oxidation in alkaline medium

Author: Xaba, Nqobile ; Modibedi, Remegia M ; Mathe, Mahlanyane K ; Khotseng, LE Date: Dec 2020 PdBiSn thin film on Au substrate was prepared by means of the electrochemical atomic layer deposition (E-ALD) technique. The morphology and elemental distribution of the catalysts was determined using scanning electron microscope equipped ... Read more
Electrodeposition of Pd based binary catalysts on Carbon paper via surface limited redox-replacement reaction for oxygen reduction reaction

Author: Modibedi, Remegia M ; Mathe, Mahlanyane K ; Motsoeneng, RG ; Khotseng, LE ; Ozoemena, KI Date: May 2014 Direct alcohol fuel cells (DAFCs) continue to extensive attention as potential power sources for portable and stationary applications. The oxygen reduction reaction (ORR) involving the four electron transfer remains a challenge for DAFCs due ... Read more
Electroformation of Pd-modified thin film electrocatalysts using E-ALD technique

Author: Mkhohlakali, AC ; Fuku, X ; Modibedi, Remegia M ; Khotseng, LE ; Mathe, Mkhulu K Date: Jul 2021 Electrochemical atomic layer deposition was used to form bimetallic (BiPd, CuPd) and trimetallic (CuBiPd) thin films via surface-confined reactions. Pd thin films were characterized by cyclic voltammetry, scanning electron microscopy (SEM) ... 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
Incorporation of UiO-66 into graphene foam for hydrogen storage applications

Author: Bambalaza, Sonwabo E ; Langmi, Henrietta W ; Musyoka, Nicholas M ; Ren, Jianwei ; Khotseng, LE Date: May 2018 The fabrication of application-specific metal-organic framework (MOF) composites has the potential to shift more towards hydrogen storage system integration. The in-situ growth of nano particles on a graphene surface is a common technique for ... Read more
Pd, PdSn, PdBi, and PdBiSn nanostructured thin films for the electro-oxidation of ethanol in alkaline media

Author: Xaba, Nqobile ; Modibedi, Remegia M ; Mathe, Mahlanyane K ; Khotseng, LE Date: Feb 2019 Pd, PdSn, PdBi and PdBiSn nanostructured thin films were prepared on Au substrate using the electrochemical atomic layer deposition technique. The activity of the nanostructured thin films towards the electro-oxidation of ethanol was tested ... Read more
The synthesis of PdPt/carbon paper via surface limited redox replacement reactions for oxygen reduction reaction

Author: Motsoeneng, RG ; Modibedi, Remegia M ; Mathe, Mahlanyane K ; Khotseng, LE ; Ozoemena, KI Date: Sep 2015 Surface-limited redox replacement reactions using the electrochemical atomic layer deposition (EC-ALD) technique were used to synthesize PdPt bimetallic electrocatalysts on carbon paper substrate. Electrocatalysts having different Pd:Pt ratio ... Read more
Underpotential deposition of SnBi thin films for sodium ion batteries: The effect of deposition potential and Sn concentration

Author: Xaba, Nqobile ; Modibedi, Remegia M ; Khotseng, LE ; Mathe, Mahlanyane K ; Palaniyandy, Nithyadharseni Date: Nov 2019 Bimetallic SnBi film was deposited on a Cu foil substrate via the electrochemical atomic layer deposition (E-ALD) technique. The deposition attainment of Sn and Bi were investigated using cyclic voltammetry (CV) and linear sweep voltammetry ... Read more

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Browsing by Author "Khotseng, LE"

Browsing by Author "Khotseng, LE"

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