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Browsing by Author "Modibedi, Remegia M"

Now showing items 21-40 of 54

Electrochemical atomic layer deposition of Pt nanostructures on carbon paper and Ni foam; poster

Author: Louw, EK ; Modibedi, Remegia M ; Ozoemena, K ; Mathe, Mahlanyane K Date: Jul 2012 The cost of the platinum catalyst hinders the progress of direct methanol fuel cells (DMFCs) into the commercial world. Electrochemical atomic layer deposition (ECALD) method was used to reduce the amount of Pt used and to increase its ... Read more
Electrochemical atomic layer deposition of Pt nanostructures on fuel cell gas diffusion layer

Author: Modibedi, Remegia M ; Mkwizu, T ; Kunjuzwa, N ; Ozoemena, K ; Mathe, Mahlanyane K Date: Dec 2010 Pt nanoparticles were deposited on carbon paper using the electrochemical atomic layer deposition technique. Pt and Cu were detected using SEM and EDX. Read more
Electrochemical deposition and characterization of platinum on carbon paper and Ni foam

Author: Louw, E ; Modibedi, Remegia M ; Cele, L ; Ozeomena, K ; Mathe, Mahlanyane K Date: Apr 2013 There are various methods used to prepare fuel cell (FC) catalysts. The electrochemical deposition method is well known for the fabrication of nanostructured catalysts for energy materials. Electrochemical atomic layer deposition (ECALD) ... 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
Electrochemical evaluation of Pt-Based binary catalysts on various supports for the direct methanol fuel cell

Author: Khotseng, L ; Bangisa, A ; Modibedi, Remegia M ; Linkov, V Date: Jan 2016 Multi-walled carbon nanotubes (MWCNTs), TiO(sub2), MoO(sub2), and carbon black Vulcan XC-72 were investigated as supports for PtRu and PtSn catalysts. X-ray diffraction (XRD) confirmed that all electrocatalysts examined display characteristic ... Read more
Electrodeposited Cu2ZnSnS4 thin films

Author: Valdes, M ; Modibedi, Remegia M ; Mathe, Mahlanyane K ; Hillie, T ; Vazquez, M Date: May 2014 Cu(sub2)ZnSnS(sub4)(CZTS) thin films have been prepared using Electrochemical Atomic Layer Deposition (EC-ALD)and also by one-step conventional constant potential electrodeposition. Optimal deposition conditionswere investigated using cyclic ... 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
Electrodeposition of ternary BiTePd nanofilm electrocatalyst using surface-limited reaction for direct ethanol fuel cell

Author: Mkhohlakali, Andile ; Fuku, Xolle ; Modibedi, Remegia M ; Khotseng, L ; Mathe, Mkhulu Date: Apr 2022 Herein, we report electro-synthesis of BiTePd using electrochemical atomic layer deposition (E-ALD). The SEM-EDS, AFM, and XRD were used to characterize Pd-based thin films' surface morphology and structure composition. BiTePd electrocatalyst ... 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
Fabrication and characterisation of hydrogen fuel cell membrane electrode assemblies

Author: Mathe, Mahlanyane K ; Hietkamp, S ; Rohwer, Mark B ; Modibedi, Remegia M ; Masuku, C ; Masombuka, T ; Mohlala, M Date: Sep 2006 Proton-exchange membrane fuel cells (PEMFC) have been receiving attention owing to their highly attractive properties as a power source for both stationary and mobile applications. Fabrication of Membrane Electrode Assemblies (MEAs) is a key ... Read more
Fast microwave-assisted solvothermal synthesis of metal nanoparticles (Pd, Ni, Sn) supported on sulfonated MWCNTs: Pd-based bimetallic catalysts for ethanol oxidation in alkaline medium

Author: Ramulifho, T ; Ozoemena, KI ; Modibedi, Remegia M ; Jafta, CJ ; Mathe, Mahlanyane K Date: Jan 2012 The preparation of metal nanoparticles (Pd, Ni, Sn) supported on sulfonated multi-walled carbon nanotubes (SF-MWCNTs) using a very rapid microwave-assisted solvothermal strategy has been described. Electrocatalytic behaviour of the SF-MWCNT-Pd ... Read more
Fuel cell activities at the CSIR: Presentation

Author: Modibedi, Remegia M Date: Mar 2013 Fuel cells continue to be investigated as alternative energy source because of the high energy demand worldwide. Research activities worldwide are focussed on improving the performance of the catalysts, support material, membrane, MEA ... Read more
Fuel cell catalysts and membrane development at the CSIR: Presentation

Author: Modibedi, Remegia M Date: Jul 2013 Fuel cells continue to be investigated as alternative energy source because of the high energy demand worldwide. Research activities worldwide are focussed on improving the performance of the catalysts, support material, membrane, MEA ... Read more
Fuel cell electrodes: Electrochemical characterization and electrodeposition of Pt nanoparticles

Author: Modibedi, Remegia M Date: May 2008 Metrohm potentiostat are used in our laboratory for characterising fuel cell electrodes. Pt based materials were prepared and tested for electrochemical activity. Read more
High rate and stable capacity performance of 2D LiMn1.5Ni0.5O4 nanoplates cathode with ultra-long cycle stability

Author: Palaniyandy, N ; Reddy, MV ; Zaghib, zK ; Kebede, Mesfin A ; Raju, Kumar ; Modibedi, Remegia M ; Mathe, Mahlanyane K ; Abhilash, KP ; Balamuralikrishnan, S Date: May 2022 Typically, the high electrochemical performance of cathode materials is achieved by fine-tuning the surface morphology and particle size of the nano-electrode materials. Two-dimensional (2D) nanomaterials like nanoplates show astounding ... Read more
A high selectivity quaternized polysulfone membrane for alkaline direct methanol fuel cells

Author: Abuin, GC ; Franceschini, EA ; Nonjola, Patrick NT ; Mathe, Mahlanyane K ; Modibedi, Remegia M ; Corti, HR Date: 01 Apr 2015 Alkaline membranes based on quaternized poly(arylene ether sulfone) (QPAES) were characterized in relation to their water and methanol uptake, methanol permeability, electrical conductivity, and mechanical properties. The performance of QPAES ... Read more
Methanol electro-oxidation on Pt-Ru-P/C and Pt-Ru-P/MWCNT in acidic medium

Author: Modibedi, Remegia M ; Masombuka, T ; Hietkamp, S ; Mathe, Mahlanyane K Date: Jun 2009 Pt-Ru-P was prepared by the chemical reduction method using sodium hypophoshite as a reducing agent on Vulcan XC 72 and multi-walled carbon nano-tubes (MWCNTs). Sodium citrate was added as the stabilizer during electro-catalyst preparation. ... Read more
Microwave activation of palladium nanoparticles for enhanced ethanol electrocatalytic oxidation reaction in alkaline medium

Author: Rohwer, Mark B ; Modibedi, Remegia M ; Ozoemena, KI Date: Feb 2015 The impact of microwave irradiation on the structure and electrochemistry of monodispersed palladium nanoparticles is reported for the first time. When compared to the Pd that was not subjected to microwave treatment, the microwaved Pd ... Read more
Microwave-assisted pechini synthesis of Pd-Ni nanocatalyst for ethanol electro-oxidation in alkaline medium

Author: Rohwer, Mark B ; Ozoemena, K ; Modibedi, Remegia M Date: Nov 2012 Fuel cells provide a means for the direct conversion of fuels to electricity. Direct alcohol fuel cells (DAFCs) are particularly attractive because liquid fuels such as methanol or ethanol have a relatively low cost, a high volumetric energy ... Read more
Microwave-induced defective PdFe/C nano-electrocatalyst for highly efficient alkaline glycerol oxidation reactions

Author: Mphahlele, Nonhlanhla E ; Ipadeola, AK ; Haruna, AB ; Mwonga, PV ; Modibedi, Remegia M ; Palaniyandy, Nithyadharseni ; Billing, C ; Ozoemena, KI Date: Mar 2022 Pd-based mono- and bi-metallic nano-electrocatalysts (Pd/C and PdFe/C) have been synthesized using two different methods for comparison: conventional sodium borohydride (NaBH4) route and microwave-assisted reduction process. The performance ... Read more

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