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Browsing by Subject "Oxygen reduction reaction"

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Efficient oxygen reduction reaction using ruthenium tetrakis(diaquaplatinum)octacarboxyphthalocyanine catalyst supported on MWCNT platform

Author: Maxakato, NW ; Mamuru, SA ; Ozoemena, KI Date: Feb 2011 Electrocatalytic reduction of molecular oxygen in alkaline solution using a novel ruthenium tetrakis(diaquaplatinum) octacarboxyphthalocyanine (RuOCPcPt) electrocatalyst supported on multi-walled carbon nanotube electrode has been described. ... 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
Electrochemical preparation of iron-supported carbon-cloth electrode and its application in the in-situ production of hydrogen peroxide

Author: Emeji, I ; Ama, Monday O ; Osifo, P ; Ray, Suprakash S ; García-Rodríguez, O ; Lefebvre, O Date: Aug 2019 This study describes how carbon-cloth (CC) electrode was demonstrated to have good electrical conductivity using linear sweep voltammetry (LSV). Its electrocatalytic activity was evaluated toward the generation of hydrogen peroxide (H2O2) via ... 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
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
Glucose-derived carbon supported well-dispersed CrN as competitive oxygen reduction catalysts in acidic medium

Author: Luo, J ; Tang, H ; Tian, X ; Liao, S ; Ren, Jianwei ; Zhao, W ; Qiao, X Date: Aug 2019 In this work, a glucose-derived carbon supported CrN composite is prepared by using a hydrothermal method and followed by a nitridating process. It is found that CrN nanoparticles in the composite are well-dispersed and separated by the carbon ... Read more
Heterogeneous electron transfer and oxygen reduction reaction at nanostructured iron(II) phthalocyanine and its MWCNTs nanocomposites

Author: Mamuru, SA ; Ozoemena, KI Date: May 2010 Electron transfer and oxygen reduction dynamics at nanostructured iron(II) phthalocyanine/multi-walled carbon nanotubes composite supported on an edge plane pyrolytic graphite electrode (EPPGE-MWCNT-nanoFePc) platform have been reported. All ... Read more
Influence of Co doping on physiochemical properties of MnFe2O4/C nano compounds toward oxygen reduction reaction

Author: Matseke, Mphoma, S ; Zheng, Haitao ; Mathe, Mkhulu K ; Carleschi, E ; Doyle, B Date: Dec 2021 Recently, several researchers have found that the manganese ferrite (MnFe2O4) nanoparticle can be a promising candidate for the oxygen reduction reaction (ORR). However, the MnFe2O4 nanoparticles still face challenges on their ORR activity ... Read more
Insight into thermal effect on the surface properties and potentials of MnO2 (a, ß, Y) as electrocatalysts for the oxygen reduction reaction

Author: Zheng, Haitao ; Shi, Xuan ; Jiang, S ; Han, X ; Wen, L Date: Nov 2023 The purpose of the work is to study the thermal behavior of MnO2 (a, ß, ) nanomaterials as well as their performance in oxygen reduction reaction (ORR) before/after thermal treatment. After thermal treatment, oxygen vacancies were introduced ... Read more
Iron (II) tetrakis(diaquaplatinum) octacarboxyphthalocyanine supported on multi-walled carbon nanotubes as effective electrocatalyst for oxygen reduction reaction in alkaline medium

Author: Mamuru, SA ; Ozoemena, KI Date: Nov 2010 Oxygen reduction reaction (ORR) in alkaline medium at iron (II) tetrakis (diaquaplatinum) octacarboxyphthalocyanine (PtFeOCPc) catalyst supported on multi-walled carbon nanotubes (MWCNTs) has been described. The ORR followed the direct ... Read more
Maximization of quadruple phase boundary for alkaline membrane fuel cell using nonstoichiometric a-MnO2 as cathode catalyst

Author: Shi, X ; Ahmad, S ; Perez-Salcedo, K ; Escobar, B ; Zheng, Haitao ; Kannan, AM Date: Jan 2019 Oxygen can only be reduced at the quadruple phase boundary (catalyst, carbon support, ionomer and oxygen) of the cathode catalyst layer with non-conducting electrocatalyst. To maximize the quadruple phase boundary sites is crucial to increase ... Read more
Ni-doped CoFe2O4/C nanoparticles as efficient catalysts for ORR in alkaline media

Author: Matseke, Mphoma S Date: Aug 2019 This presentation discusses the Ni-doped CoFe2O4/C nanoparticles as efficient catalysts for ORR in alkaline media. Read more
Oxygen reduction reaction at MWCNT-modified nanoscale iron(II) tetrasulfophthalocyanine: remarkable performance over platinum and tolerance toward methanol in alkaline medium

Author: Fashedemi, OO ; Ozoemena, KI Date: Apr 2015 A nanoscale iron(II) tetrasulfophthalocyanine (nanoFeTSPc) catalyst obtained by co-ordinating with hexadecyltrimethylammonium bromide and subsequently anchored onto multi-walled carbon nanotubes (MWCNTs) for oxygen reduction reaction (ORR) ... Read more
Oxygen reduction reaction using N4-metallomacrocyclic catalysts: fundamentals on rational catalyst design

Author: Masa, J ; Ozoemena, K ; Schuhmann, W ; Zagal, JH Date: Aug 2012 In this review, we describe and discuss the developments in the use of metalloporphyrins and metallophthalocyanines as catalysts for oxygen reduction in aqueous electrolytes. The main goal of most researchers in this field has been to design ... Read more
Palladium-based nanocatalysts for alcohol electrooxidation in alkaline media

Author: Modibedi, Remegia M ; Ozoemena, KI ; Mathe, Mahlanyane K Date: 2013 Direct alcohol alkaline fuel cells (DAAFCs) are potential power sources for a variety of portable applications as they provide unique advantages over hydrogen-based fuel cell devices. Alcohols (such as methanol, ethanol, ethylene glycol, and ... Read more
Ruthenium supported on nitrogen-doped carbon nanotubes for the oxygen reduction reaction in alkaline electrolyte; Poster

Author: Mabena, LF ; Modibedi, Remegia M ; Ray, Suprakas S ; Coville, NJ Date: Jul 2012 The oxygen reduction reaction (ORR) at the cathode of fuel cells plays an important role in controlling the performance of a fuel cell but the poor kinetics of the ORR hinders this performance. Currently platinum-based metals are the best ... Read more
Spinel LiMn2O4 Nanoparticles Grown in Situ on Nitrogen-Doped Reduced Graphene Oxide as an Efficient Cathode for a Li-O2/Li-Ion Twin Battery

Author: Leng, L ; Zeng, X ; Song, H ; Shu, T ; Wang, H ; Ren, Jianwei ; Liao, S Date: 2019 Seeking to design high-efficiency catalyst (LMO@N-rGO) for Li-O(sub2) batteries, we suggested a onestep hydrothermal strategy to grow well-crystallized spinel LiMn(sub2)O(sub4) (LMO) nanoparticles homogeneously on nitrogendoped reduced graphene ... Read more
Studies on the heterogeneous electron transport and oxygen reduction reaction at metal (Co, Fe) octabutylsulphonylphthalocyanines supported on multi-walled carbon nanotube modified graphite electrode

Author: Mamuru, SA ; Ozoemena, KI ; Fukuda, T ; Kobayashi, N ; Nyokong, T Date: Sep 2010 Heterogeneous electron transfer dynamics and oxygen reduction reaction (ORR) activities using octabutylsulphonylphthalocyanine complexes of iron (FeOBSPc) and cobalt (CoOBSPc) supported on multi-walled carbon nanotube (MWCNT) platforms have ... Read more

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