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Browsing by Author "Le Roux, Lukas J"

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Determination of effects of reverse bias on the efficiency of dye solar cells with the aid of spectroscopic and impedance studies

Author: Le Roux, Lukas J Date: Sep 2010 The work that is presented here is focused on the results that were obtained during studies of the performance of the DSC under certain reverse bias conditions. When one cell in the series connection in a module is shaded, the current will ... Read more
Dye solar cells ( and PV's) in South Africa

Author: Le Roux, Lukas J Date: Feb 2006 Various institutions are doing research on photovoltaics in South Africa. Although the CSIR is the only one that does research on DSC's there is significant support from the different universities. In the presentation a short overview of the ... Read more
Dye solar cells: a different approach to solar energy

Author: Le Roux, Lukas J ; Hietkamp, S ; Cummings, F Date: Nov 2008 An attractive and cheaper alternative to siliconbased photovoltaic (PV) cells for the conversion of solar light into electrical energy is to utilise dyeadsorbed, large-band-gap metal oxide materials such as TiO2 to absorb the solar light. ... Read more
Dye-sensitised solar cell (artificial photosynthesis)

Author: Le Roux, Lukas J ; Arendse, C ; Hietkamp, S ; Knoesen, D Date: Jul 2005 A novel system that harnesses solar energy is the nano-crystalline TiO dye-sensitised solar cell (DSC), in conjunction with several new concepts, such as nanotechnology and molecular devices. An efficient and low-cost cell can be produced by ... Read more
Dye-sensitised solar cell (artificial photosynthesis)

Author: Le Roux, Lukas J ; Arendse, C ; Hietkamp, S Date: Feb 2006 As fuel sources become depleted, there is an increasing need to turn to alternative sources of energy. Of particular interest, especially in southern Africa, is solar energy, since it is clean and abundant. A novel system that harnesses solar ... Read more
Effects of reverse bias on the efficiency of dye solar cells

Author: Le Roux, Lukas J Date: Aug 2009 Dye-sensitised solar cells (DSC) have attracted much attention during the last few years due to their high efficiencies and their potentially low production costs. The technology is based on a thin layer of nano sized, high band gap (3.2 eV) ... Read more
Electron migration and stability of dye solar cells

Author: Le Roux, Lukas J ; Hietkamp, S Date: Jul 2008 Dye-sensitised photoelectrochemical solar cells with four different electrolyte combinations were assembled and characterised using current voltage measurements. The effects that the solvents (acetonitrile - ACN and propionitrile - PN) have ... Read more
Laboratory controlled quantitative information about reduction in air pollution using the "Basa njengo Magogo" methodology and applicability to low-smoke fuels

Author: Le Roux, Lukas J ; Zunckel, M ; McCormick, SG Date: Jan 2005 The Department of Minerals and Energy (DME) piloted the top-down Basa njengo Magogo fire ignition method at Orange Farm during the winter in 2003. In total, 76 per cent of households reported less smoke in their homes, 67 percent reported ... Read more
Li4Ti5O12/graphene nanoribbons composite as anodes for lithium ion batteries

Author: Medina IV, PA ; Zheng, Haitao ; Fahlman, BD ; Annamalai, P ; Swartbooi, Ashton M ; Le Roux, Lukas J ; Mathe, Mahlanyane K Date: Oct 2015 In this paper, the authors report the synthesis of a Li4Ti5O12/Graphene Nanoribbons (LTO/GNRs) composite using a solid-coating method. Electron microscope images of the LTO/GNRs composite have shown that LTO particles were wrapped around ... Read more
Manganese oxide/graphene oxide composites for high-energyaqueous asymmetric electrochemical capacitors

Author: Jafta, CJ ; Nkosi, F ; Le Roux, Lukas J ; Mathe, Mahlanyane K ; Kebede, Mesfin A ; Makgopa, K ; Song, Y ; Tong, D ; Oyama, M ; Manyala, N ; Chen, S ; Ozoemena, KI Date: Nov 2013 A high-energy aqueous asymmetric electrochemical capacitor was developed using manganese diox-ide ( -MnO2)/graphene oxide (GO) nanocomposites. The nanostructured -MnO2was prepared frommicron-sized commercial electrolytic manganese dioxide ... Read more
Mechanistic formation of TiO2 nanotubes via anodisation – effect of operating voltage and time

Author: Cummings, FR ; Le Roux, Lukas J ; Hietkamp, S Date: Jul 2008 Titanium dioxide (TiO) nanotubes hold great potential for application in dye-sensitised solar cells for they provide a one-dimensional transport route for generated charge carriers. An investigation is launched into the formation of these ... Read more
Metal octacarboxy phthalocyanines / Multiwalled carbon nanotubes hybrid for the development of dye solar cells

Author: Mphahlele, N ; Ozoemena, KI ; Le Roux, Lukas J ; Cele, LM Date: May 2011 Dye solar cell (DSC) has become one of the attractive devices for the conversion of solar energy into electricity worldwide, because of their remarkable properties such as low cost, non-toxicity and easy to fabricate as compared to other ... Read more
Microwave-assisted optimization of the manganese redox states for enhanced capacity and capacity retention of LiAl(subx)Mn(sub2-x)O(sub4) (x = 0 and 0.3) spinel materials

Author: Nkosi, FP ; Jafta, CJ ; Kebede, Mesfin A ; Le Roux, Lukas J ; Mathe, Mahlanyane K ; Ozoemena, KI Date: Mar 2015 Microwave irradiation at the pre- and post-annealing steps of the synthesis of LiAl(subx)Mn(sub2-x)O(sub4) (x = 0 and 0.3) spinel cathode materials for rechargeable lithium ion battery is a useful strategy to optimize the average manganese ... Read more
Photoelectrochemistry of metallo-octacarboxyphthalocyanines for the development of dye solar cells

Author: Mphahlele, N ; Ozoemena, K ; Le Roux, Lukas J ; Mathe, Mahlanyane K ; Nyokong, T ; Cele, LM ; Soji, S ; Kobayashi, N Date: Sep 2011 Significant attention is being paid to dye solar cells (DSCs) as the next generation in solar cell technology for their low cost alternative as compared to solid state solar cells. Read more
Reduction in air pollution using the “Basa Njengo Magogo” methodology and applicability to low-smoke fuels

Author: Le Roux, Lukas J Date: 2009 The Department of Minerals and Energy (DME) piloted the top-down Basa njengo Magogo fire ignition method at Orange Farm during the winter in 2003. In total, 76% of households reported less smoke in the homes, while 67% reported less smoke in ... Read more
Spectroscopic and impedance studies of reverse biased degraded dye solar cells

Author: Le Roux, Lukas J ; Knoesen, D ; Hietkamp, S Date: Mar 2011 The work that is presented here is focused on the results that were obtained during studies of the performance of Dye Solar Cells under certain reverse bias conditions. This reverse voltage could permanently modify or damage a cell if it is ... Read more
Structural and electrochemical properties of aluminium doped LiMn2O4 cathode materials for Li battery: experimental and ab initio calculations

Author: Kebede, Mesfin A ; Phasha, MJ ; Kunjuzwa, N ; Le Roux, Lukas J ; Mkhonto, D ; Ozoemena, KI ; Mathe, Mahlanyane K Date: Mar 2014 Pristine and Al-doped lithium manganese oxide (LiAlxMn2-xO4) spinel cathode materials were successfully synthesized by combustion method using urea as reducer and fuel. The structural and electrochemical properties of the as-synthesized powders ... Read more
Synthesis, photophysical and preliminary investigation of the dye-sensitized solar cells properties of functionalized anthracenyl-based bipyridyl and phenanthrolyl Ru(II) complexes

Author: Adeloye, AO ; Ajibade, PA ; Cummings, FR ; Le Roux, Lukas J ; Mamphweli, SN ; Meyer, EL Date: Jan 2013 Four new amphiphilic ligands: 4-(2,3-dimethylacrylic acid)-2,2′-bipyridine (L(sub1), 4-(9-anthracenyl-10-(2,3-dimethylacrylic acid)-2,2′-bipyridine (L(sub2), 5-(2,3-dimethylacrylic acid)-1,10-phenanthroline (L(sub3) and 5-(9-anthracenyl-10- ... Read more
TiO2 nanotube-based dye solar cell research in South Africa

Author: Cummings, F ; Le Roux, Lukas J ; Mutangwa, N ; Knoesen, D Date: Oct 2009 Vertically orientated titanium dioxide (TiO2) nanotubes hold great potential for application in dye-sensitized solar cells (DSCs) as they provide an unscathed, one-dimensional transport route for photo-generated charge carriers, thereby ... Read more

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