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Browsing Journal Articles by Author "Raju, Kumar"

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a-MnO2 nanorod/onion-like carbon composite cathode material for aqueous zinc-ion battery

Author: Palaniyandy, Nithyadharseni ; Kebede, Mesfin A ; Raju, Kumar ; Ozoemena, KI ; Le Roux, Lukas ; Mathe, Mahlanyane K ; Jayaprakasam, R Date: May 2019 Onion-like carbon (OLC) integrated a-MnO2 nanorods (a-MnO2/OLC) composite has been studied as a viable cathode material for potential development of high-performance zinc-ion batteries (ZIBs). XRD results revealed the tetragonal phase of the ... Read more
Ammonium metal phosphates: Emerging materials for energy storage

Author: Raju, Kumar Date: Jun 2020 The search for new materials that can hold the heteroatoms viz., nitrogen, oxygen and phosphorus becomes crucial for robust energy storage and conversion devices. Recently, ammonium metal phosphates (NH4MPO4, M = Mn2+, Ni2+, Co2+, Fe2+, etc.) ... Read more
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
Carbon onion/sulfur hybrid cathodes via inverse vulcanization for lithium-sulfur batteries

Author: Choudhury, S ; Srimuk, P ; Raju, Kumar ; Tolosa, A ; Fleischmann, S ; Zeiger, M ; Ozoemena, KI ; Borchardt, L ; Presser, V Date: Jan 2018 A sulfur–1,3-diisopropenylbenzene copolymer was synthesized by ring-opening radical polymerization and hybridized with carbon onions at different loading levels. The carbon onion mixing was assisted by shear in a two-roll mill to capitalize ... Read more
Conversion of electrolytic MnO2 to Mn3O4 nanowires for high-performance anode materials for lithium-ion batteries

Author: Palaniyandy, Nithyadharseni ; Nkosi, FP ; Raju, Kumar ; Ozoemena, KI Date: Jan 2019 A simple and versatile approach has been implemented for the preparation of some manganese oxide (MnxOy)-based lithium-ion battery anode materials from low-cost electrolytic manganese dioxide (EMD). Depending on the additive, calcination ... Read more
The effects of morphology re-arrangements on the pseudocapacitive properties of mesoporous molybdenum disulfide (MoS2) nanoflakes

Author: Khawula, TNY ; Raju, Kumar ; Franklyn, PJ ; Sigalas, I ; Ozoemena, Kenneth I Date: Jul 2016 Mesoporous molybdenum disulfide (MoS(sub2)) with different morphologies have been prepared via hydrothermal method using different solvents, water or water/acetone mixture. The MoS(sub2) obtained with water alone gave a graphene-like nanoflakes ... Read more
Efficient catalytic reduction of nitroaromatics by recyclable 2-naphthalene sulfonic acid doped polyaniline nanotubes decorated with NiFe2O4 nanorods

Author: Sypu, VS ; Kear, NH ; Bhaumik, M ; Raju, Kumar ; Maity, Arjun Date: Mar 2021 A hybrid nanostructure comprising NiFe2O4 nanorods and 2-naphthalene sulfonic acid (2-NSA) doped polyaniline nanotubes (NiFe2O4@PANI/NSA) has been explored as an efficient catalyst for the reduction of nitroaromatics in the aqueous medium. ... Read more
Fluorinated Mn3O4 nanospheres for lithium-ion batteries: Low-cost synthesis with enhanced capacity, cyclability and charge-transport

Author: Palaniyandy, Nithyadharseni ; Nkosi, Funeka P ; Raju, Kumar ; Ozoemena, KI Date: Apr 2018 A facile synthesis of fluorinated Mn3O4 nano-spheres (F-Mn3O4) from low-cost electrolytic manganese dioxide (EMD) at different temperatures and times has been reported. While the as-prepared materials are micron-sized (>200 nm) and the ... Read more
Hierarchical one-dimensional ammonium nickel phosphate microrods for high-performance pseudocapacitors

Author: Raju, Kumar ; Ozoemena, KI Date: Dec 2015 High-performance electrochemical capacitors will drive the next-generation portable, flexible and wearable electronics. Unlike the conventional all-carbon supercapacitors (electric double layer capacitors, EDLC) with high power but poor energy ... Read more
High-performance Mn3O4/onion-like carbon (OLC) nanohybrid pseudocapacitor: Unravelling the intrinsic properties of OLC against other carbon supports

Author: Makgopa, K ; Raju, Kumar ; Ejikeme, PM ; Ozoemena, Kenneth I Date: Jun 2017 The electrochemical performance of the tetragonal hausmannite Mn3O4, when embedded on various carbon materials, onion-like carbon (OLC), carbon nanotubes (CNT), reduced graphene oxide (RGO) and activated carbon (AC) (i.e., OLC/Mn3O4, CNT/Mn3O4, ... Read more
High-performance supercapacitors based on S-doped polyaniline nanotubes decorated with Ni(OH)2 nanosponge and onion-like carbons derived from used car tyres

Author: Bhaumik, M ; Raju, Kumar ; Arunachellan, Iviwe C ; Ludwig, T ; Mathe, Mahlanyane K ; Maity, Arjun ; Mathur, S Date: May 2020 High performance supercapacitors are designed based on hierarchical Ni(OH)2 nanosponges anchored on sulfur-enriched polyaniline (PANI) nanotubes and waste tyre-derived onion-like carbons (OLC) as counter electrode materials. The rational ... Read more
A high-rate aqueous symmetric pseudocapacitor based on highly graphitized onion-like carbon/birnessite-type manganese oxide nanohybrids

Author: Makgopa, K ; Ejikeme, PM ; Jafta, CJ ; Raju, Kumar ; Zeiger, M ; Presser, V ; Ozoemena, KI Date: Jan 2015 We present a study on the pseudocapacitive properties of birnessite-type MnO(sub2) grafted on highly graphitized onion-like carbon (OLC/MnO(sub2)). In a three-electrode setup, we evaluated two different substrates, namely a platinum disc and ... Read more
High-voltage symmetric supercapacitor based on 2D Titanium Carbide (MXene, Ti2CTx)/carbon nanosphere composites in a neutral aqueous electrolyte

Author: Melchior, SA ; Raju, Kumar ; Ike, IS ; Erasmus, RM ; Kabongo, G ; Sigalas, L ; Iyuke, SE ; Ozoemena, KI Date: Feb 2018 The energy storage performance of one of the lightest-known MXenes, Ti2CTx (MX) combined with carbon nanospheres (CNS) has been investigated as a symmetric electrode system in an aqueous electrolyte (1 M Li2SO4). The energy storage properties ... Read more
Influence of mesoporous defect induced mixed-valent NiO(Ni2+/Ni3+)-TiO2 nanocomposite for non-enzymatic glucose biosensors

Author: Rajendren, S ; Manoj, D ; Raju, Kumar ; Dionysiou, DD ; Naushad, M ; Gracia, F ; Cornejo, L ; Gracia-Pinilla, MA ; Ahamad, T Date: Jul 2018 An extraordinary sensitive and selective non-enzymatic glucose sensor has been demonstrated based on the electrochemically highly stable NiO-TiO2 mixed oxide comprising the defect induced mesoporous TiO2 nanoparticles with Ni2+ and Ni3+ ions ... Read more
Influence of microwave irradiation and combustion fuels on the rate capability and cycle performance of Li1.2Mn0.52Ni0.13Co0.13Al0.02O2 layered material

Author: Nkosi, Funeka ; Palaniyandy, Nithyadharseni ; Raju, Kumar ; Ozoemena, K Date: Oct 2020 Commercialization of lithium-manganese rich oxides (LMR-NMC) cathodes for lithium-ion batteries is hindered by shortcomings such as severe capacity fade and poor rate capability. This work reveals the synergetic effect of the structure and ... Read more
Insights into the synergistic roles of microwave and fluorination treatments towards enhancing the cycling stability of P2-type Na0.67[Mg0.28Mn0.72]O2 cathode material for sodium-ion batteries

Author: Nkosi, Funeka P ; Raju, Kumar ; Palaniyandy, Nithyadharseni ; Reddy, MV ; Billing, C ; Ozoemena, KI Date: Nov 2017 P2-type Na0.67Mg0.28Mn0.72O2 based cathode materials for sodium-ion batteries were prepared using combustion synthesis. The effect of microwave irradiation and fluorination was investigated with the aim to improve the electrochemical performance. ... 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
Microwave irradiation controls the manganese oxidation states of nanostructured (Li[Li0.2Mn0.52Ni0.13Co0.13Al0.02]O2) layered cathode materials for high-performance lithium ion batteries

Author: Jafta, CJ ; Raju, Kumar ; Mathe, Mahlanyane K ; Manyala, N ; Ozoemena, KI Date: Feb 2015 A hybrid synthesis procedure, combining microwave irradiation and conventional annealing process, is described for the preparation of lithium-rich manganese-rich cathode materials, Li[Li0.2Mn0.54Ni0.13Co0.13]O2 (LMNC) and its aluminum-doped ... Read more
Microwave-enhanced electrochemical cycling performance of the LiNi0.2Mn1.8O4 spinel cathode material at elevated temperature

Author: Raju, Kumar ; Nkosi, FP ; Viswanathan, E ; Mathe, Mahlanyane K ; Damodaran, K ; Ozoemena, Kenneth I Date: Apr 2016 The well-established poor electrochemical cycling performance of the LiMn(sub2)O(sub4) (LMO) spinel cathode material for lithium-ion batteries at elevated temperature stems from the instability of the Mn(sup3+) concentration. In this work, a ... Read more
Nanoporous copper-cobalt mixed oxide nanorod bundles as high performance pseudocapacitive electrodes

Author: Nwanya, AC ; Awada, C ; Obi, D ; Raju, Kumar ; Ozoemena, Kenneth I ; Osuji, RU ; Ruediger, A ; Maaza, M ; Rosei, F ; Ezema, FI Date: Feb 2017 We used a simple, cost effective and scalable chemical method to deposit mixed oxides of copper and cobalt on indium tin oxide (ITO) and stainless steel (ss) substrates. The deposited mixed oxides of Cu-Co and Co-Cu exhibit uniform surface ... Read more

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