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Browsing by Author "Modibedi, Remegia M"

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Carbon supported Pd-Ni and Pd-Ru-Ni nanocatalysts for the alkaline direct ethanol fuel cell (DEFC)

Author: Modibedi, Remegia M ; Mathe, Mahlanyane K ; Ozoemena, KI Date: Sep 2011 Ethanol powered direct alcohol fuel cells (DAFCs) have attracted enormous attention as potential power sources for portable electronic devices and transportation due to the much higher energy density than gaseous fuels such as hydrogen and ... Read more
Carbon supported Pd-Ni and Pd-Ru-Ni nanocatalysts for the alkaline direct ethanol fuel cell (DEFC)

Author: Mathe, Mahlanyane K ; Modibedi, Remegia M Date: Aug 2011 Carbon supported Pd-Ni and Pd-Ru-Ni nanocatalysts were prepared by the chemical reduction method, using sodium borohydride and ethylene glycol mixture as the reducing agent. The catalytic activity towards ethanol electro-oxidation in alkaline ... Read more
Carbon supported Pd-Sn and Pd-Ru-Sn nanocatalysts for ethanol electro-oxidation in alkaline medium

Author: Modibedi, Remegia M ; Masombuka, T ; Mathe, Mahlanyane K Date: Apr 2011 Carbon supported Pd-Sn and Pd-Ru-Sn nanocatalysts were prepared by the chemical reduction method, using sodium borohydride and ethylene glycol mixture as the reducing agent. The catalytic activity towards ethanol electro-oxidation in alkaline ... Read more
Chemical modification of polysulfone: composite anionic exchange membrane with TiO2 nano-particles

Author: Nonjola, Patrick NT ; Mathe, Mahlanyane K ; Modibedi, Remegia M Date: Apr 2013 Synthesis of quaternary polysulfone/Titanium dioxide (QPSf/TiO2) nanocomposite membranes by the recasting procedure as suitable electrolyte in alkaline fuel cells is described. The composite membranes were characterized by ionic conductivity ... Read more
Co-existence of Pd, Bi2O3 and CuO supported on porous activated biocarbon for electrochemical conversion and energy storage

Author: Fuku, Xolile G ; Modibedi, Remegia M ; Mkhohlakali, Andile ; Mathe, Mahlanyane K Date: Aug 2021 The co-existence of metal oxides (MO) and activated carbon (AC) causes changes in the catalytic behaviour and activity which would contribute greatly to a number of applications. Pd–AC/Bi2O3/CuO synthesized via the green process was used as ... Read more
Covalently cross-linked polyetheretherketone proton exchange membrane for DMFC

Author: Luo, H ; Vaivars, G ; Modibedi, Remegia M ; Mathe, Mahlanyane K Date: May 2009 The proton exchange membrane was prepared by covalent cross-linking sulfonated-sulfinated polyetheretherketone. The cross-linked membrane showed high proton conductivity (0.04 S/cm) with suitable water uptake, low methanol permeability (2.21 ... Read more
Cross-lined PEEK proton exchange membranes for fuel cell - Conference Poster

Author: Luo, H ; Vaivars, G ; Modibedi, Remegia M ; Mathe, Mahlanyane K Date: Jul 2009 The low-cost cross-linked Polyetheretherketone (PEEK) proton exchange membranes were prepared via the simple route. The membranes exhibited similar electrochemical properties as compared with commercial Nafion. The membranes were highly proton ... Read more
Crystalline thin films: The electrochemical atomic layer deposition (ECALD) view

Author: Modibedi, Remegia M Date: Sep 2011 Electrochemical atomic layer deposition technique is selected as one of the methods to prepare thin films for various applications, including electrocatalytic materials and compound. Read more
The effect of g-C3N4 materials on Pb(II) and Cd(II) detection using disposable screen-printed sensors

Author: Zheng, Haitao ; Ntuli, Letta ; Mbanjwa, Mesuli ; Palaniyandy, Nithyadharseni ; Smith, Suzanne ; Modibedi, Remegia M ; Land, Kevin J ; Mathe, Mahlanyane K Date: Dec 2018 The disposable electrochemical sensors were designed and fabricated onto a photo paper substrate in-house. We report a first case use of g-C3N4, which is an emerging material as the most stable carbon-like polymer, explored for application ... Read more
The effect of nickel precursors on the electrochemical properties of spinel LiMn2-xNixO4 cathode: a comparative study ofNi(NO3)2·6H2O and NiSO4·6H2O as nickel sources

Author: Kunjuzwa, Niki ; Kebede, Mesfin A ; Mathe, Mahlanyane K ; Modibedi, Remegia M Date: May 2019 A comparative study was carried out with the effect of nickel precursors on the electrochemical performance of spinel LiMn2−x Ni x O4 (x = 0, 0.1 and 0.2) cathode materials. The spinel materials were prepared by employing a low temperature ... Read more
Effect of P on the electrochemical activity of carbon supported Pt-Ru alloy catalyst for methanol oxidation.

Author: Mohlala, M ; Modibedi, Remegia M ; Mathe, Mahlanyane K Date: Nov 2007 In polymer electrolyte membrane fuel cell (PEMFC), platinum is recognized to be the most active metal for methanol oxidation, however there is a strong CO adsorption tendency, which blocks the surface for further methanol adsorption and leads ... 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
Electro-deposition of Pd on Carbon paper and Ni foam via surface limited redox-replacement reaction for oxygen reduction reaction: Presentation

Author: Modibedi, Remegia M ; Louw, E ; Mathe, Mahlanyane K ; Ozoemena, K Date: Mar 2013 Fuel cells continue to be investigated as alternative energy source because of the high energy demand worldwide. The electrocatalytic reduction of oxygen is of great importance in fuel cells and sensors. Noble metals have proved to be the ... Read more
Electro-design of bimetallic PdTe electrocatalyst for ethanol oxidation: Combined experimental approach and ab initio Density Functional Theory (DFT)-Based Study

Author: Mkhohlakali, A ; Fuku, X ; Seo, MH ; Modibedi, Remegia M ; Khotseng, L ; Mathe, M Date: Oct 2022 An alternative electrosynthesis of PdTe, using the electrochemical atomic layer deposition (E-ALD) method, is reported. The cyclic voltammetry technique was used to analyze Au substrate in copper (Cu2+), and a tellurous (Te4+) solution was ... Read more
Electro-oxidation of alcohols using carbon supported gold, palladium catalysts in alkaline media

Author: Maumau, Thandiwe R ; Modibedi, Remegia M ; Mathe, Mahlanyane K Date: May 2018 Mono and binary Pd-Au based catalysts were synthesized using the NaBH4 assisted ethylene glycol reduction method. The catalysts were supported on Vulcan XC 72 carbon black and denoted as Pd/C, Au/C, Pd(Au/C) and Pd-Au/C co-reduction. Pd:Au ... Read more
Electrocatalysis research for fuel cells and hydrogen production

Author: Mathe, Mahlanyane K ; Mkwizu, T ; Modibedi, Remegia M Date: 2012 The CSIR undertakes research in the Electrocatalysis of fuel cells and for hydrogen production. The Hydrogen South Africa (HySA) strategy supports research on electrocatalysts due to their importance to the national beneficiation strategy. ... Read more
Electrocatalytic optically modulated green prepared nanoparticles

Author: Fuku, Xolile G ; Modibedi, Remegia M Date: Dec 2019 Nanoscience has shown itself to be one of the most exciting areas in science, with experimental developments being driven by pressing demands for new technological applications. It is a highly multidisciplinary research field, and the ... Read more
Electrocatalytic oxidation of ethylene glycol at palladium-bimetallic nanocatalysts (PdSn and PdNi) supported on sulfonate-functionalised multi-walled carbon nanotubes

Author: Ramulifho, T ; Ozoemena, KI ; Modibedi, Remegia M ; Jafta, CJ ; Mathe, Mahlanyane K Date: Apr 2013 Electrocatalytic oxidation of ethylene glycol (EG) in alkaline medium using nano-scaled palladium-based bimetallic catalysts (PdM, where M = Ni and Sn) supported on sulfonated multi-walled carbon nanotubes (SF-MWCNTs) is compared. The bimetallic ... Read more
The electrochemical atomic layer deposition of Pt and Pd nanoparticles on Ni foam for the electro oxidation of alcohols

Author: Modibedi, Remegia M ; Louw, EK ; Mathe, Mahlanyane K ; Ozoemena, KI Date: 2013 Electrodeposition of Pt and Pd metal by surface limited redox replacement reactions was performed using the electrochemical atomic layer deposition. Carbon paper and Ni foam were used as substrates for metal deposition. Supported Pt and Pd ... Read more
The Electrochemical Atomic Layer Deposition of Pt and Pd nanoparticles on Ni foam for the electrooxidation of alcohols

Author: Modibedi, Remegia M ; Louw, EK ; Ozoemena, KI ; Mathe, Mahlanyane K Date: Oct 2012 Electrodeposition of Pt and Pd metal by surface limited redox replacement reactions was performed using the electrochemical atomic layer deposition. Carbon paper and Ni foam were used as substrates for metal deposition. Supported Pt and Pd ... Read more

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