About
282
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Introduction
Skills and Expertise
Current institution
Current position
- Chief Research Scientist & Research Group Leader, Electrochemical Energy Technologies
Additional affiliations
March 2009 - present
Position
- Extra-ordinary Professor
Description
- As an extra-ordinary Professor, I train research students. I have trained well over 20 Masters and Doctorate students. This is my little way of giving back to the country that has been a blessing to me by what Nelson Mandela did.
Publications
Publications (282)
Adsorption and corrosion caused by Cl− are the main reasons for the low performance of Pt-based catalysts for the hydrogen evolution reaction (HER) in seawater. Although the introduction of hydroxyl species is an ideal approach to enhance HER kinetics and resist harmful Cl−, achieving this goal in Pt-based catalysts is challenging. In this study, w...
Rechargeable zinc–air batteries (RZABs) have been described as one of the most viable next-generation battery technologies, especially due to their low cost, high capacity, and being environmental-friendly. In this work, hausmannite Mn3O4 nanoparticles, obtained from low-cost commercial electrolytic manganese dioxide, were dispersed on conductive m...
Stabilizing the electrode interphases is urgently required to enhance the lifetime of high‐voltage sodium‐ion batteries (SIBs). However, the continuous anode solid–electrolyte interphase (SEI) growth associated with electron leakage and the fragile cathode–electrolyte interphase (CEI) lead to capacity fade at high voltage; and yet the solvation‐int...
Like other aqueous batteries, aqueous rechargeable Al‐ion batteries (ARAIBs) have attracted much attention due to their high safety and low cost. However, the low energy density of ARAIBs limits its popularization and application. In order to solve this problem, in addition to choosing Al metal as the negative electrode, it is also necessary to cho...
Tailoring of charge transport properties of the electron transport layer (ETL) in solution-processible solar cells is continuously addressed not only for the performance enhancements in perovskite solar cells but also in various other applications in nanotechnology. In this work, three p-type dopants: barium, cesium (Cs), and yttrium (Y) with varyi...
The electrocatalyst NiFeRuOx/NF, comprised of NiFeRuOx nanosheets grown on Ni foam, was synthesized using a hydrothermal process followed by thermal annealing. NiFeRuOx/NF displays high electrocatalytic activity and stability for overall alkaline seawater splitting: 98 mV@ 10 mA·cm−2 in hydrogen evolution reaction, 318 mV@ 50 mA·cm−2 in oxygen evol...
Human papillomavirus (HPV) is the causative agent for cervical cancer. Of the various types of HPV, the high-risk HPV-16 type is the most important antigenic high-risk HPV. In this work, the antigenic HPV-16 L1 peptide was immobilized on a glassy carbon electrode and used to detect several concentrations of the anti-HPV-16 L1 antibody, and vice ver...
The catalytic activity and durability of ternary Pd-based electrocatalysts are augmented by alloying with other metals and using supports, however, the effect of supports and electrolytes at varied pH on the electrochemical CO oxidation (COOxid) performance is not yet studied. Here, PdNiO-CeO2/CB nanosphere composed of PdNiO nanocrystals sprouted o...
Drug abuse has proliferated at an unprecedented rate worldwide, posing significant public health challenges that directly impact society, criminality, and the economy. This review presents the application of nanomaterials for qualitative and quantitative electrocatalytic analysis of drugs of abuse, mostly opioids (such as heroin (HER), morphine (MO...
This study reports on the valorisation of marula nutshell waste into a valuable electrode material for supercapacitors. Marula nutshell waste, a brown hard residue from marula fruits was valorised into a nitrogen-doped activated carbon (N-ACs) by KOH treatment and using melamine as a nitrogen source. The microporous and mesoporous nature of N-ACs e...
This work reports the first study on the possible application of nanodiamond-derived onion-like carbons (OLCs), in comparison with conductive carbon black (CB), as an electrode platform for the electrocatalytic detection of tramadol (an important drug of abuse). The physicochemical properties of OLCs and CB were determined using X-ray diffraction (...
Correction for ‘Pd/Ni-metal–organic framework-derived porous carbon nanosheets for efficient CO oxidation over a wide pH range’ by Adewale K. Ipadeola et al. , Nanoscale Adv. , 2022, https://doi.org/10.1039/d2na00455k.
Direct alcohol fuel cells are deemed as green and sustainable energy resources; however, CO-poisoning of Pt-based catalysts is a critical barrier to their commercialization. Thus, investigation of the electrochemical CO oxidation activity (COOxid) of Pt-based catalyst over pH ranges as a function of Pt-shape is necessary and is not yet reported. He...
An electrocatalyst composed of RuO2 surrounded by interfacial carbon, is synthesized through controllable oxidization‐calcination. This electrocatalyst provides efficient charge transfer, numerous active sites, and promising activity for pH‐universal electrocatalytic overall seawater splitting. An electrolyzer with this catalyst gives current densi...
Controlling microbial proliferation in water systems, including wastewater, recreational water, and drinking water, is essential to societal health. Microbial inactivation through electrochemically generated reactive species (RS) mediated pathways provides an effective route toward this microbial control. Herein we provide an overview of recent pro...
Jahn-Teller (J-T) distortion remains the key challenge to realizing the full electrochemistry potential of the commercialized LiMn2O4 cathode material for lithium-ion batteries. In this work, the application of microwave irradiation to suppress the limiting J-T distortion in pristine LMO (LMO-p) materials and improve the electrochemistry of lithium...
This study reports the preparation, characterization, and electrocatalytic properties of palladium-based catalysts containing ceria (CeO2) on carbon black (CB) and onion-like carbon (OLC) supports. The electrocatalysts (Pd-CeO2/CB and Pd-CeO2/OLC) exhibit a large specific surface area, pore volume, and small particle size, as well as enhanced inter...
Rational composition design of trimetallic phosphide catalysts is of significant importance for enhanced surface reaction and efficient catalytic performance. Herein, hierarchical Co x Ni y Fe z P with precise control of stoichiometric metallic elements (x:y:z = (1-10):(1-10):1) has been synthesized, and Co1.3Ni0.5Fe0.2P, as the most optimal compos...
The durability and long-term applicability of catalysts are critical parameters for the commercialization and adoption of fuel cells. Even though a few studies have been conducted on hollow carbon spheres (HCSs) as supports for Pt in oxygen reduction reactions (ORR) catalysis, in-depth durability studies have not been conducted thus far. In this st...
Lithium-sulfur batteries (LSBs) have sparked a lot of attention due to their high theoretical energy density and cost-effectiveness. However, several challenges, notably unstable cycle life and low sulfur consumption, have hampered the development of workable LSBs for commercial use. Most of these challenges arise from the cathode materials and liq...
Correction for ‘Carbon onion/sulfur hybrid cathodes via inverse vulcanization for lithium–sulfur batteries’ by Soumyadip Choudhury et al. , Sustainable Energy Fuels , 2018, 2 , 133–146, DOI: 10.1039/C7SE00452D.
The evolution of cost-effective and reserve-rich nonprecious metals (NPMs) to replace precious metal electrocatalysts is of significant interest in modern electrocatalysis. The confinement effects in NPM-based nanoparticles encapsulated in carbon nanoshells have been considered as an emerging and efficient way to special types of electrocatalysts w...
MXenes have emerged as a superlative contestant water purification technology due to their two-dimensional multilayered structures, multifarious chemical composition, photocatalytic properties, and activated metallic hydroxide sites. The explosion of publications on MXenes results in (≥ 4380 articles) with the title ‘’MXenes’’ according to the Web...
Invited for this month's cover picture is the group of Prof. Dr. Kenneth I. Ozoemena at the University of the Witwatersrand and collaborators from Qatar University and Peking University. The Front Cover illustrates the significance of bifunctional electrocatalysis (ORR / OER) and zinc anode as the key drivers for the development of rechargeable zin...
This study examines the role of defects in structure–property relationships in spinel LiMn1.5Ni0.5O4 (LMNO) cathode materials, especially in terms of Mn³⁺ content, degree of disorder, and impurity phase, without the use of the traditional high-temperature annealing (≥700 °C used for making disordered LMNO). Two different phases of LMNO (i.e., highl...
Rechargeable aluminum batteries (RABs) have attracted great interest as one of the most promising candidates for large-scale energy storage because of their high volumetric capacity, low cost, high safety and the abundance of aluminum. However, compared with the aluminum anodes, the cathode materials face more problems including low specific capaci...
Beneficial properties of graphitic carbon nitride (gCN) have been discovered in recent years during the promotion of its visible‐light‐driven photocatalytic activity for water splitting. Applications of gCN have flourished in such fields as renewable energy production and environmental remediation, while gCNs have been explored to serve as electroc...
Pd/Ni-based catalysts consisting of Ni-rich MOF-derived carbon (Pd/Ni-r/MOFDC) and Ni-deficient counterpart
(Pd/Ni-d/MOFDC) have been demonstrated as efficient nanostructured catalysts for alkaline hydrogen oxidation
(HOR) and oxygen reduction reactions (ORR). Physico-chemical analysis of the catalysts unravels the significance of controlled chemic...
This work investigates how bovine serum albumin (BSA), a commonly used protein in the fabrication of electrochemical immunosensors, can impact on the sensitivity of detection when integrated with antibody (Ab) pre-encapsulated with (i) insulating polyacrylonitrile (PAN) fibre (i.e., GCE-PAN-Ab-BSA immunosensor) or (ii) conducting PAN-grafted iron (...
The performances of the core-shell nano-electrocatalysts (FeCo@Fe@Pd/CNT-OH and their monometallic Pd counterparts (Pd/CNT-OH) on carbon nanotubes in passive and active direct methanol fuel cells (DMFCs) and direct ethanol fuel cells (DEFCs) have been studied. The direct alcohol alkaline fuel cell (DAAFCs) performances of the two nanocatalysts stud...
The development of active and durable proton exchange membrane fuel cell catalysts with high loading (ca. 40%) is critical for the commercialization of hydrogen fuel cells. Herein we report on the synthesis of a novel Pt/C catalyst using a novel bowl-like broken hollow carbon sphere (and N-doped sphere) support (carbon shell thickness ~ 4.6 nm). Hi...
An indirect fuel cell concept is presented herein where a palladium‐based membrane (either pure Pd with 25 m m thickness or Pd 75 Ag 25 alloy with 10 m m thickness) is used to separate the electrochemical cell compartment from a catalysis compartment. In this system, hydrogen is generated from a hydrogen‐rich molecule, such as formic acid, and sele...
Controlling the porosity of carbon-based electrodes is key toward performance improvement of charge storage devices, e.g., supercapacitors, which deliver high power via fast charge/discharge of ions at the electrical double layer (EDL). Here, eco-friendly preparation of carbons with adaptable nanopores from polymers obtained via microwave-assisted...
The Cover page illustrates that palladium‐nickel on carbon‐derived metal organic frameworks efficiently splits water into oxygen and hydrogen
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 morphology in reducing capacity fade and improving rate capability in Li1.2Mn0.52Ni0.13Co0.13Al0.02O2 (LMNCA)...
This work compares the supercapacitive properties of pristine molybdenum disulfide (MoS2¬‐AS) and its counterpart annealed at 450ºC (MoS2¬‐450) in 1 M Na2SO4 solution. The MoS2‐450 powder delivers an increased specific capacitance and low charge‐tansfer resistance compared to the MoS2¬‐AS powder, interpreted as the consequence of high pore size and...
Metal-organic framework derived carbon (MOFDC) serves as supporting platforms for PdNi catalyst (Pd/Ni/MOFDC) and acid-treated nickel counterpart (Pd/AT-Ni/MOFDC). The two Pd-based electrocatalysts are tested for alkaline water-splitting (i.e., hydrogen evolution (HER) and oxygen evolution reactions (OER)). The results reveal better HER and OER kin...
A low cost synthesis of catalyst free carbon nano‐onions (CNOs) and nitrogen post doped CNOs (N−CNOs) using grapeseed oil is reported. Successful incorporation of nitrogen atoms into the lattice of CNOs was confirmed by XPS, resulting in 1.7 % nitrogen content. BET and Raman analysis showed an increase in the specific surface area and the ID/IG rat...
The Cover Feature illustrates that the interface between palladium and stannic oxide promotes hydrogen oxidation reaction (HOR), a reaction that can generate clean electricity for a plethora of applications, including transportation, consumer electronics, home and rural electrification. More information can be found in the Article by A. K. Ipadeola...
This work demonstrates hierarchical 3D nitrogen-doped carbon nanotube-carbon fibre ([email protected]) networks obtained via a two-step synthetic technique: electrospinning and chemical vapour deposition (CVD) methods. Scanning Electron Microscopy (SEM) and Transmission Electron Microscope (TEM) reveal randomly entangled networks structure. Raman s...
This work describes the use of electrospun onion-like carbon-polyacrylonitrile fibre (OLC-PAN) hybrids as an efficient electrode platform for electrochemical immunosensor for Vibrio cholerae Toxin in water samples. First, the OLC-PAN nanohybrid was obtained by electrospinning technique. The immunosensor was constructed by covalent integration of th...
Manganese-based materials have been attractive candidates for zinc-air batteries in the recent years. This is as a result of their natural abundance, low cost and level of toxicity. However, this review shows that the application still faces some challenges. In our opinion, continual fundamental information on strategies for improving the catalytic...
Cobalt-based metal–organic framework-derived carbon (MOFDC) has been studied as a new carbon-based support for a Pd catalyst for electrochemical water-splitting; i.e., the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline medium. The study shows a high increase in the HER activity, in terms of low onset overpotential...
Efficient approaches for toxic metal removal from wastewater have had transformative impacts to mitigating freshwater scarcity. Adsorption is among the most promising purification techniques due to its simplicity, low cost, and high removal efficiency at ambient conditions. MXene-based nanoarchitectures emerged as promising adsorbents in a plethora...
Planar perovskite solar cells (PPSCs) have received great attention in recent years due to their intriguing properties, which make them a good choice for photovoltaic applications. In this work, the effect of alkali and transition metal-doped TiO2 (cesium-doped TiO2 (Cs-TiO2) and yttrium-doped TiO2 (Y-TiO2)) compact layers on the optical, structura...
An electrochemical immunosensor for Vibrio cholerae toxin (VCT) has been developed using electrospun carbon nanofibers (CNFs) as the electrode platform. To fabricate the immunosensor, the anti-cholera toxin antibody (Ab) was covalently immobilized on the electrode platforms using the carbodiimide chemistry for the amide bond formation. Every step o...
Manganese-based materials have been attractive candidates for zinc-air batteries in the recent years. This is as a result of their natural abundance, low cost and level of toxicity. However, this review shows that the application still faces some challenges. In our opinion, continual fundamental information on strategies for improving the catalytic...
The voltammetric responses of novel porous Co3O4 spinel materials supported on MOF-derived carbons (MOFDC) have been described. The electrocatalysts were prepared using microwave-assisted hydrothermal methods, obtaining both Rich- and Starved-Co3O4 MOF-derived carbons (i.e., R-Co3O4@MOFDC and S-Co3O4@MOFDC). The physicochemical properties of the po...
The effect of carbon onions or onionlike carbons (OLCs) as a dopant on the supercapacitive properties of titanium carbide MXene (Ti2C) has been studied. The materials were characterized using x-ray diffraction, Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, x-ray photoelectron spectroscopy, and electrochemical t...
Alkaline direct ethanol fuel cells (ADEFCs) represent one of the promising renewable and clean energy devices for portable, stationary and transportation auxiliary applications. The use of ethanol as fuel is due to its low toxicity, high energy density (theoretical energy density of 8 kWh-1 kg) and large production from sugar containing agricultura...
Nanostructured SnO2/onion-like carbon (OLC) composites were fabricated via a facile and rapid microwave-assisted synthesis technique. The influence of SnO2 nanorods anchored on OLC was investigated as an anode material for the first time in lithium-ion battery applications. The OLC successfully served as a barrier layer between SnO2 nanorods and el...
Bimetallic Pd/SnO2 nanoparticle electrocatalysts on metal organic framework-derived carbon (MOFDC) were successfully synthesized using microwave-assisted strategies and explored for ethanol oxidation reaction (EOR) in alkaline solution. The materials were thoroughly characterized using XRD, XPS, TEM, and Raman. TEM showed that Pd/SnO2/MOFDC gave th...
This work describes the electrochemical detection of dopamine in samples (pure raw materials as well as pharmaceutical formulation) using onion-like carbon (OLC) and its carbon nanofiber composites (OLC-CNF). The OLC-CNF and precursor materials (polyacrylonitrile (PAN) fiber and OLC-PAN) were synthesized using electrospinning process. The morpholog...
Onion-like carbon (OLC) integrated α-MnO 2 nanorods (α-MnO 2 /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 α-MnO 2 materials, and the FE-SEM and HR-TEM images show nano-sized rod-shaped morphology with an average...
Bimetallic Pd/SnO2 nanoparticle electrocatalysts on metal organic framework-derived carbon (MOFDC) were successfully synthesized using microwave-assisted strategies and explored for ethanol oxidation reaction (EOR) in alkaline solution. The materials were thoroughly characterized using XRD, XPS, TEM, and Raman. TEM showed that Pd/SnO2/MOFDC gave th...
The performance of MXenes (Ti2CTx) combined with electrolytic manganese dioxide (EMD) in three different weight ratios (i.e. MXene:EMD = 20:80; 50:50; 80:20) were examined as anode material for Lithium-ion batteries (LIBs). A study of the structure, composition and morphology of the synthesized materials was conducted. The materials were further in...
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 were
interrogated using cyclic voltammetry (CV), galvanostatic cycling with potential limitation (GCPL), el...
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 temperature and time used in the preparation, the raw EMD exhibits different nano−/micro-structure morphologies,...
Fuel cell-based breath-alcohol sensor (FCBrAS) remains the most widespread and reliable electrochemical device, for the detection of alcohol due to its inherent advantages such as portability, rapid detection, acceptable accuracy, sensitivity and selectivity. However, despite the advances in nanotechnology, FCBrAS still suffers from several technic...
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 fluorinated Mn3O4 are nano-sized particles (<50 nm). Detailed characterization (using XRD, XPS, FESEM and EDX, ele...
The commercialization of rechargeable lithium-ion batteries in 1991 by Sony Corporation revolutionized the portable electronics industry [1]. Lithium-ion batteries are used in a variety of electronic devices such as cell phones, laptops, and cameras. Recently, lithium-ion batteries have also revolutionized the automobile industry; they are found in...
High-energy density lithium-ion batteries (LIBs) are ultimately the key drivers for portable electronic devices, hybrid electric vehicles and smart grid-energy storage systems [1]. However, the potential scarcity of lithium resources, which are used as cathode and organic electrolytes in batteries, as well as their low safety, will be a serious imp...
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 were interrogated using cyclic voltammetry (CV), galvanostatic cycling with potential limitation (GCPL), el...
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 morphology (> 200 nm in length), while the LFMP/RGO gave a sponge-like spherical morphology (≥ 100 nm diamete...
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. Four samples were considered: samples were prepared by the combustion method (NaMgMnO-a) and then eithe...
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 the LFP was achieved with a low-cost commercial electrolytic manganese oxide (EMD) precursor using a microwav...
In this paper, we show that magnesium and cobalt doped SnO2 (Mg-SnO2 and Co-SnO2) nanostructures have profound influence on the discharge capacity and coulombic efficiency of lithium ion batteries (LIBs) employing pure SnO2 and zinc doped SnO2 (Zn-SnO2) as benchmark materials. The materials were synthesized via sol-gel technique. The structural, ch...
A molten salt synthesis technique has been used to prepare nanorods of Mn2O3 and single-crystal LiMn2O4 nanorods cathode material with superior capacity retention. The molten salt-directed synthesis involved the use of NaCl as the eutectic melt. The as-synthesized LiMn2O4 nanorods cathode material showed superior electrochemical performance compare...
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 morphology with nanoporous structure as obtained from scanning electron microscopy (SEM). The electrochemical...
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, GO/Mn3O4, and AC/Mn3O4), has been investigated as electrode material for symmetric and asymmetric pseudoc...
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 morphology with nanoporous structure as obtained from scanning electron microscopy (SEM). The electrochemical...
The three types of MnO2 (α, β, and γ) materials were synthesized and were thermal treated to generated oxygen vacancy. The oxygen reduction reactions were measured for the three materials in 0.1KOH solution before and after thermal treatment. The comparison results have indicated thermal treatments have accelerated the activities of ORR on the α-Mn...
The potential of onion-like carbon (OLC) as an efficient alternative carbon support for palladium-decorated manganese dioxide (Pd-MnO2) catalyst for the electro-oxidation of glycerol in alkaline medium is reported. Pd-MnO2/OLC and Pd-MnO2/C (where C denotes activated carbon or Vulcan carbon XC-72) catalysts and their corresponding reference monomet...
The alkaline direct alcohol fuel cell (ADAFC) is an environmentally friendly electrochemical energy source that can drive a plethora of consumer and portable electronics. Research in ADAFCs has continued to attract major attention due to their several advantages over conventional proton-exchange membrane fuel cells (PEMFC); these include the emerge...
Every market analysis predicts that lithium-ion batteries (LIBs) will dominate energy storage technologies for now and the foreseeable future. LIBs will drive many applications ranging from portable electronics to electric vehicles and smart grids, while also permitting a greener and more sustainable global environment. The few successful cathode m...
Metal oxides such as TiO2, Li4Ti5O12, SnO2, SnO, M2SnO4 (\( \mathrm{M} = \mathrm{Z}\mathrm{n} \), Co, Mn, Mg), TMO (\( \mathrm{T}\mathrm{M} = \mathrm{M}\mathrm{n} \), Fe, Co, Ni, or Cu), TM3O4 (\( \mathrm{T}\mathrm{M} = \mathrm{C}\mathrm{o} \), Fe, or Mn), and lithium alloys Li–Sn, Li–Si are among the next-generation anode materials for lithium–ion...
The fundamental properties of supercapacitors such as basic understanding of calculations for symmetric and asymmetric systems and the effect of electrolytes are described. Manganese oxides such as MnO2 exhibited a great potential in the field of energy storage due to their structural as well as electrochemical properties, thus attracting much atte...
Mesoporous molybdenum disulfide (MoS2 ) with different morphologies have been prepared via hydrothermal method using different solvents, water or water/acetone mixture. The MoS2 obtained with water alone gave a graphene-like nanoflakes (g-MoS2 ) while the other with water/acetone (1:1 ratio) gave a hollow-like morphology (h-MoS2 ). Both materials a...
The operating life of a fuel cell is expected to be thousands of hours. One of the critical components of the fuel cell that will allow for such long-life cycle is the catalyst-support material. The support material is expected, amongst others, to be electrically conductive, strongly interact with the catalyst, possess large surface area, and be co...
Pseudocapacitive properties of nickel (II) tetraaminophthalocyanine-modified graphene oxide sheets (GO/NiTAPc) composites have been studied. Microscopic and spectroscopic analysis of the GO/NiTAPc electrode material with its precursors (GO and NiTAPc) were examined using Field Emission Scanning Electron Microscopy (FESEM), High-Resolution Transmiss...
Lithium manganese oxide (LMO) is a state-of-the-art cathode material for lithium-ion batteries. LMO works well at ambient temperature; however, it undergoes rapid capacity-fading during cycling at elevated temperatures (~55 o C) due to the manganese-dissolution. The last two decades have witnessed a number of strategies reported in the literature (...
The well-established poor electrochemical cycling performance of the LiMn2O4 (LMO) spinel cathode material for lithium-ion batteries at elevated temperature stems from the instability of the Mn(3+) concentration. In this work, a microwave-assisted solid-state reaction has been used to dope LMO with a very low amount of nickel (i.e., LiNi0.2Mn1.8O4,...
