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Browsing by Author "Zheng, Haitao"

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Capacity and charge-transport enhancement of LFP/RGO by doping with a-MnO2 in a microwave-assisted synthesis

Author: Rossouw, Claire A ; Raju, Kumar ; Zheng, Haitao ; Ozoemena, KI Date: Dec 2017 Manganese-doped lithium iron phosphate (LFMP), coated with reduced graphene oxide (RGO), has been prepared by a microwave-assisted solvothermal technique. The un-doped lithium iron phosphate material with RGO (i.e., LFP/RGO) gave a rod-like ... Read more
Development of paper-based electrochemical sensors for water quality monitoring

Author: Smith, Suzanne ; Bezuidenhout, Petroné ; Mbanjwa, Mesuli ; Zheng, Haitao ; Conning, Mariette Date: Sep 2016 We present a method for the development of paper-based electrochemical sensors for detection of heavy metals in water samples. Contaminated water leads to serious health problems and environmental issues. Paper is ideally suited for point-of-care ... 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 synthesis temperature on the properties of TiO2 (B) nanorods and its precursors as anode materials for lithium-ion batteries

Author: Ncube, Ntombizodwa M ; Zheng, Haitao Date: Jan 2020 In this work, we carried out a detailed research on the effect of synthesis temperature on the properties of TiO(sub2) (B) nanorods and its hydrogen titanate precursors. At the initial stage, hydrogen titanates (HTOs)were synthesised at ... Read more
The effect of ultrasonic cavitation on surficial properties of metals and industrial processes

Author: Zheng, Haitao ; Mathe, Mkhulu Date: Sep 2023 Ultrasonic cavitation is a phenomenon that occurs when high-frequency sound waves are introduced into a liquid medium, causing the formation and collapse of small bubbles within the liquid. These bubbles generate high-energy shock waves that ... Read more
Electrocatalytic performance of Co-doped NiFe2O4/C nanoparticles towards oxygen reduction reaction in alkaline media

Author: Matseke, Mphoma S ; Zheng, Haitao ; Mallick, Kaushik Date: Nov 2019 Spinel metal oxides with the general formula of AB(sub2)O(sub4) have attracted a lot of attention over the past few decades as promising cathode materials for oxygen reduction reaction (ORR) in fuel cells. This is due to their changeable ... Read more
The electrochemical effect of Al-doping on Li4Ti5O12 as anode material for lithium-ion batteries

Author: Ncube, NM ; Mhlongo, WT ; McCrindle, RI ; Zheng, Haitao Date: May 2018 This work investigates the electrochemical performance of Al-doped Li4Ti5O12 (LTO) on the Li site (Li4-xAlxTi5O12) and Ti site (Li4Ti5-xAlxO12) (x = 0.15), evaluated by galvanostatic charge-discharge tests and the electrochemical impedance ... Read more
A facile method of asymmetric ether-containing polybenzimidazole membrane for high temperature proton exchange membrane fuel cell

Author: Ou, T ; Chen, H ; Hu, B ; Zheng, Haitao ; Li, W ; Wang, Y Date: Jul 2018 A facile method has been suggested for the preparation of poly [2,20-(p-oxydiphenylene)-5,50-benzimidazole] (OPBI) membrane that comprises of dense and porous layers for high temperature proton exchange membrane fuel cells (HT-PEMFCs). The ... Read more
A green approach for enhancing the electrocatalytic activity and stability of NiFe2O4/CB nanospheres towards hydrogen production

Author: Munonde, Tshimangadzo S ; Zheng, Haitao ; Matseke, Mphoma S ; Nomngongo, PN ; Wang, Y ; Tsiakaras, P Date: Mar 2020 Among the exfoliation processes applied on layered materials, it is the first time to explore the ultrasonic exfoliation in water for improving the catalytic properties of NiFe(sub2)O(sub4)/CB (CB = carbon black) nanospheres towards the ... Read more
Growth of MnO2 nanoflakes on TiO2 nanorods for pseudocapacitor

Author: Mo, L ; Zheng, Haitao Date: Jun 2019 In this work, we report the synthesis of TiO2 (core)/MnO2(shell) nanorods by a redox reaction and TiO2 nanorods generated in-site from H-titanate nanorods during hydrothermal process. The MnO2 nanoflakes were grown densely on TiO2 nanorods ... Read more
Imade-imide cross-linked PEEK proton exchange membrane.

Author: Luo, H ; Vaivars, G ; Mathe, Mahlanyane K ; Zheng, Haitao Date: Aug 2009 The proton exchange membrane is a key component of polymer electrolyte membrane fuel cell (PEMFC). It plays an important role, conducts protons and separates the fuel from oxidant in PEMFC. DuPont’s Nafion is a perfluorinated sulfonic acid ... Read more
The impact of ultrasonic parameters on the exfoliation of NiFe LDH nanosheets as electrocatalysts for the oxygen evolution reaction in alkaline media

Author: Munonde, Tshimangadzo S ; Zheng, Haitao Date: Aug 2021 The ultrasonic process has been examined to exfoliate layered materials and upgrade their properties for a variety of applications in different media. Our previous studies have shown that the ultra-sonication treatment in water without chemicals ... 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
Interacting CoFe2O4 nanoparticles with different carbon materials for high performance oxygen evolution

Author: Munonde, Tshimangadzo S ; Nomngongo, PN ; Zheng, Haitao Date: Nov 2019 Electrocatalytic oxygen electrochemistry involving the conversion of H(sub2)O into O(sub2) has attracted considerable attention as a greener process for clean energy generation. However, the oxygen evolution reaction (that facilitates this ... 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-enriched electrochemistry of LiFePO4/RGO nanohybrid for aqueous energy storage

Author: Rossouw, Claire A ; Raju, Kumar ; Zheng, Haitao ; Ozoemena, Kenneth I Date: Jul 2017 Manganese-doped lithium iron phosphate (LFMP) integrated with reduced graphene oxide (RGO) has been prepared via microwave-assisted synthesis and investigated as lithium-ion energy storage system in aqueous Li2SO4 electrolyte. The doping of ... 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
Metal oxides and lithium alloys as anode materials for lithium-ion batteries

Author: Kebede, Mesfin A ; Zheng, Haitao ; Ozoemena, KI Date: Jul 2016 Metal oxides such as TiO(sub2), Li(sub4)Ti(sub5)O(sub12), SnO(sub2), SnO, M(sub2)SnO(sub4) (M=ZnM=Zn, Co, Mn, Mg), TMO (TM=MnTM=Mn, Fe, Co, Ni, or Cu), TM(sub3)O(sub4) (TM=CoTM=Co, Fe, or Mn), and lithium alloys Li–Sn, Li–Si are among the ... Read more
Nanostructured lithium titanates (Li4Ti5O12) for lithium-ion batteries

Author: Wen, L ; Luo, Honqze ; Liu, G-Y ; Zheng, Haitao Date: Jul 2016 Nanostructured lithium titanates (Li(sub4)Ti(sub5)O(sub12)) have been intensively investigated as anode materials of Li-ion batteries due to their many advantages, such as excellent performance, outstanding safety, and excellent cycle life. ... Read more

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