Naveed Janjua

Naveed Janjua
Quaid-i-Azam University | QAU · Department of Chemistry

Professor
Electrocatalysis work is under research using simple nanomaterials.

About

90
Publications
15,619
Reads
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1,343
Citations
Additional affiliations
Position
  • Molecular Spectroscopy and Nuclear Chemistry
July 2009 - June 2009
Quaid-i-Azam University
Position
  • Flanonoid-DNA binding Studies
Description
  • Antioxidant, DNA, Flavonoids, Binding
Education
November 1992 - May 1999

Publications

Publications (90)
Article
Full-text available
Using ammonia as an efficient and quick co-precipitant, pure BaCeO 3 (BCO) and Cu doped barium cerate, BaCe 1-x Cu x O 3 (BCCO), with x = 0.02-0.16 mol%, were formulated. XRD and SEM were used to characterize the impact of copper on phase and morphology, respectively. XRD exhibited cubic phase for both BCO and BCCOs. The uniformity of the nanosized...
Article
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Electrochemical water splitting is one of the most promising methods for producing green oxygen and hydrogen fuels to meet concurrent increasing energy demands. Herein, versatile single phase olivines magnesium doped lithium metal phosphates (LiMPO4) where M = Co, Zn, Ni were synthesized using the non-aqueous sol–gel method. For structural and morp...
Article
A simple and efficient microwave-assisted synthesis route was adopted for carbon aerogel (CA)-supported Cu and Fe catalysts for OER in alkaline media. Catalysts were characterized physically by ICP-MS, XRD, TEM, XPS, SEM, and EDX and electrochemically by CV, chronoamperometry, and EIS. The catalyst having the composition of Cu30Fe70/CA showed excel...
Article
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This study reports novel three-step electrochemical fabrication of CoCr2O4/graphene-oxide nanocomposite on glassy carbon electrode including sequential synthesis of graphene-oxide using modified Hummer's method, CoCr2O4 nanoparticles using sol-gel method and the cost-effective co-precipitation technique for nanocomposite formation. The resulting na...
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The development of efficient and durable catalysts for the oxygen evolution reaction (OER) is urgent for renewable and sustainable energy storage and conversion. High-entropy oxides (HEOs) have gained significant attention for OER electrocatalysis owing to their multielement synergy and tunable electronic structure. The presence of multiple cations...
Article
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The oxygen evolution reaction (OER) is a critical step for oxygen production during the electrochemical splitting of water. Effective OER catalysts support the development of clean energy technologies by increasing the energy efficiency of these processes. In this study, carbon aerogel (CA) was first synthesized as a catalyst support material using...
Article
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Direct hydrazine fuel cells (DHFC) insist on the evolved and persistent electrocatalysts for anodic hydrazine oxidation reaction (HzOR). Herein, PdO promoted CuO heterostructures supported on γ‐Al2O3 are depicted as efficient electrocatalysts for HzOR. γ‐Al2O3 is prepared by precipitation method while metal precursors are incorporated by co‐impregn...
Article
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Biomass has become a key contender in the race to find sustainable energy options, as we move toward a more environmentally friendly future. This extensive assessment explores the potential of biomass to transform the global energy landscape. We have examined different conversion technologies, including thermal technologies such as combustion and g...
Article
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Electrochemical water splitting presents an optimal approach for generating hydrogen (H 2 ), a highly promising alternative energy source. Nevertheless, the slow kinetics of the electrochemical oxygen evolution reaction (OER) and the exorbitant cost, limited availability, and susceptibility to oxidation of noble metal-based electrocatalysts have co...
Article
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Electrochemical water oxidation reaction (WOR) lies among the most forthcoming approaches toward eco-conscious manufacturing of green hydrogen owing to its environmental favors and high energy density values. Its vast commoditization is restricted by high-efficiency and inexpensive catalysts that are extensively under constant research. Herein, cal...
Article
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Materials engineering is an important trajectory for the design of new complex oxide compounds for their high-temperature application in solid oxide electrochemical cells. Usually, tailoring the functional properties of such compounds is realized through a cationic-type doping strategy, when a partial substitution of basic cations with impurity ion...
Article
In this study, we presented a novel approach involving the co-precipitation synthesis of a two-dimensional MXene nanocomposite with spinel magnesiochromite MgCr 2 O 4. The resulting nanocomposite was comprehensively characterized. The synthesized nanomaterial exhibited an average crystallite size of approximately 6.85 nm, and its surface morphology...
Article
In this work, ammonia electrooxidation (AEO) is studied to probe the electrochemical behavior of aqueous NH 3 as direct fuel by implication of gamma alumina supported copper oxide catalysts (CuO/Al 2 O 3). Precipitation and impregnation techniques are adapted to synthesize the substrate Al 2 O 3 , and loading of different ratios (1%, 2%, 3%, 4%) of...
Article
Direct hydrazine liquid fuel cell (DHFC) is perceived as effectual energy generating mean owing to high conversion efficiency and energy density. However, the development of well-designed, cost effective and high performance electrocatalysts is the paramount to establish DHFCs as efficient energy generating technology. Herein, gamma alumina support...
Article
Actively study on graphene oxide nanocomposites for energy storage applications had been raised intensely in the previous dated. Novelty of synthesized materials as energy storage material has activated a rapid progress in capacitive materials. In this favor, two-dimensional (2D) graphene-based spinels of metal oxide nanocomposites display relative...
Article
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Hexanary high-entropy oxides (HEOs) were synthesized through the mechanochemical sol-gel method for electrocatalytic water oxidation reaction (WOR). As-synthesized catalysts were subjected to characterization, including X-ray diffraction (XRD), Fourier transforms infrared (FTIR) analysis, and scanning electron microscopy (SEM). All the oxide system...
Article
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RuO2 and PdO promoted CuO/Al2O3 mixed metal oxide nanostructures synthesized via co-impregnation technique demonstrated a robust electrocatalytic activity towards ammonia electro-oxidation (AEO). Physio-chemically characterized RuO2-CuO/Al2O3 and PdO-CuO/Al2O3 catalyst powders exhibited high electrochemical active surface area (ECSA), the highest b...
Article
Reactive oxygen species (ROS) are the most threatening element for shelf life of packaged food. Mainly increase ROS is related to enzymatic, photochemical and pathogen action in the packaged food. In this study the cascade in ROS is observed in the presence of gold nanoparticles (AuNPs) conjugated with gallic acid. This is an efficient and promisin...
Article
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The oxygen reduction and evolution reaction (ORR/OER), are the keystones for many energy generating and storage devices, have influence with many electrocatalytic reactions. The sluggish kinetics of these reaction is a challenging situation on the surface of electrodes which imposes large over‐potential and affects the energy output of fuel cells....
Article
Development of highly catalyzing electrode materials for hydrazine electrooxidation reaction (HzOR) demands a judicious assortment of intrinsically active candidates, precise engineering of electrodes for enhancement of active sites and building of electronically conductive structures. Herein, we report the novel, innovative and robust heterogeneou...
Article
This research intended to synthesize γ-Al2O3 supported Ag2O nanopowders (xAg2O/Al2O3, x = 1-5%) in five different compositions for alkaline water electro-oxidation reaction (WEOR). Electrochemical investigations including cyclic voltammetry (CV), linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) were performed to exami...
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Unique and significant properties of layered two-dimensional titanium carbide MXene (Ti3C2) triggered world for designing and fabricating nanoelectrode materials with maximum energy storage capacity employed in various electrochemical device applications such as supercapacitors (SCs). In the present study, novel MXene/CoCr2O4 synthesis to fabricate...
Article
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This work reports the synthesis of NaCr2O4/GO nanocomposite using co-precipitation method for energy storage applications. Characterizations e.g., scanning electron microscopy (SEM) and X-ray diffraction (XRD) were performed to investigate the important optical and structural properties. The Crystalline size is seen to decrease from 28 nm for sodiu...
Article
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MXene/Ag2CrO4 nanocomposite was synthesized effectively by means of superficial low-cost co-precipitation technique in order to inspect its capacitive storage potential for supercapacitors. MXene was etched from MAX powder and Ag2CrO4 spinel was synthesized by an easy sol-gel scheme. X-Ray diffraction (XRD) revealed an addition in inter-planar spac...
Article
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Innovation in design and fabrication of energy storage materials has triggered a swift development in capacitive materials. In this regard, two-dimensional grapheme-based spinal metal oxide nanocomposites exhibit quite substantial capacitive potential. Moreover, heteroatom-incorporated graphene nanocomposites improvise the electronic significance o...
Article
We report semiconductor-semiconductor (S-S) type heterostructures prepared by solvothermal method using ZnSe (Z), commercial titania (C-TiO2) and reduced titania (R-TiO2-x) as precursor materials. The synthesized Z-C-TiO2 and Z-R-TiO2-x heterostructures manifest remarkable electrocatalytic oxygen evolution reaction (OER) activity with onset over po...
Article
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Ammonia electro-oxidation (AEO) is a zero carbon-emitting sustainable means for the generation of hydrogen fuel, but its commercialization is deterred due to sluggish reaction kinetics and the poisoning of expensive metal electrocatalysts. With this perspective, CuO impregnated γ-Al2O3 (CuO/γ-Al2O3) hybrid materials were synthesized as effective an...
Article
Full-text available
An Ag2O(x)−PrO2(y)/γ-Al2O3 electrocatalyst series (X:Y is for Ag:Pr from 0 to 10) was synthesized, to use synthesized samples in electrochemical applications, a step in fuel cells advancements. Ag2O(x)−PrO2(y)/γ-Al2O3/Glassy-Carbon was investigated for electrochemical oxidation of ammonia in alkaline medium and proved to be highly effective, having...
Article
A series of new poly(amide-imide)s was prepared by polycondensation of our already reported diamine, N,N’-[((propane-2,2-diylbis(4,1-phenylene) bis(oxy))bis(4,1-phenylene)]bis(4-aminobenzamide) (BDM) containing flexible ether and amide linkages with different aromatic dianhydrides via simple two-step method. The synthesized poly(amide-imide)s were...
Article
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This study demonstrates the synthesis of olivine LiNiPO4 and carbon modified LiNiPO4 (LNP/C-composites) cathode materials for use in lithium-ion batteries (LIBs) synthesized via non aqueous sol-gel process. The LNP/C-composites were fabricated through high energy ball-milling of LiNiPO4 with different weight ratios of conductive carbon black. The e...
Article
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In this study, the binding tendency of bisnitrophenoxy compounds (BN) having different methylene (-CH2-)n spacer groups (n = 8-11) with fish sperm double stranded deoxyribonucleic acid (dsDNA) was explored. Cyclic voltammetry (CV) was used to evaluate various kinetic and binding parameters (Ks,h, Do, K b and binding site sizes). Performed electroc...
Article
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Absract The performance of noble metal promoted-Co/γ-Al2O3 bimetallic catalysts was examined for efficient H2 generation from hydrazine decomposition. Ruthenium, platinum and palladium were chosen as promotor metals (M) to prepare three series of bimetallic catalysts (CoMx/γ-Al2O3) via wet impregnation method. Promoting role of each noble metal was...
Article
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The corrosion inhibitive capabilities of some ferrocene-based Schiff bases on aluminium alloy AA2219-T6 in acidic medium were investigated using Tafel polarization, electrochemical impedance spectroscopy (EIS), weight loss measurement, FT-IR spectroscopy and scanning electron microscopic (SEM) techniques. The influence of molecular configuration on...
Article
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There are only scarce reports on using lanthanum cerates in water electrocatalysis. The electrocatalytic facility in water-splitting is manifested in two of the electrochemical output parameters: the lower onset potential and the higher peak current response. The robustness of the envisioned scheme of using lanthanum cerates perovskite (LaCeO3; LCO...
Article
Fabrication and attractive performance of CuO nanoparticles coated onto TiO2 substrate (CuO@TiO2) as electrocatalysts for glucose and methanol electrooxidation are detailed in this article. These bi-functional electrocatalysts were prepared by impregnating (5–25 wt%) CuO nanoparticles onto nanosized TiO2 substrate and were characterized for morphol...
Article
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The in vivo determination of radical scavenging activity of flavonoids (Fls) and their metal complexes (M‐Fls) through co‐administration of 2‐hydroxypropyl beta‐cyclodextrin (HP‐βCD) was determined. The flavonoids morin (mo), quercetin (quer), primuletin (prim), their Cu (II) and Fe (III) complexes were selected to explore their radical scavenging...
Article
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Stable bimetallic catalysts composed of CoPt x /γ-Al 2 O 3 (x = Pt/Co molar ratio) were synthesized by wet impregnation method followed by calcination and the H 2 reduction. The powders were characterized using XRD, AAS, BET, SEM, EDX, TPR, and TPO techniques. The prepared catalysts were drop casted on the glassy carbon electrode (GCE) and catalyti...
Article
Here we are presenting complete electrochemical studies on redox activities of 1,2-dinitrobenzene (DNB) in the presence of antioxidants–quercetin, morin, rutin, ascorbic acid and β-carotene. Bimolecular rate constants (k2), antioxidant activities (Ka) and diffusion coefficients (Do) were evaluated from changes in voltammeric responses and electroch...
Article
We report on a new synthesis protocol for functionalization of water-insoluble ferrocene derivative on gold nanoparticles (AuNPs) in aqueous media. 11-mercaptoundecylferrocene (HS-(CH2)11-ferrocene) (FcSH) was successfully conjugated on AuNPs in an aqueous phase with the help of different thiol-alkylated polyethyleneglycol (PEG) ligands. Cyclic vol...
Article
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An attempt has been made to incorporate intercalation power of metal-flavonoids (metal-Fls) into ds.DNA for selective accumulation of heavy metal ions on DNA trapping water insoluble (3-aminopropyl)triethoxysilane (APTES) films. Three flavonoids (Fls) namely primuletin (prim), morin (mor) and quercetin (quer) were used to chelate heavy metal ions a...
Article
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The presented work is focused on the investigation of ferrocene and its derivatives (ferrocene benzoic acid and ferrocene dicarboxylic acid) via electrochemical, and spectrophotometric for biological activity. DNA binding capacity was studied by cyclic voltammetry and UV-Vis spectroscopy with evaluation of kinetic and thermodynamic parameters. Hete...
Article
In the present work, three flavonoids (Fls) namely, quercetin (quer), morin (mor), and primuletin (prim) as well as their metal; (Cu(II) and Fe(III)) complexes (M-Fls) were deposited on APTES-FTO ((3-aminopropyl)triethoxysilane-fluorine doped tin oxide) electrodes. The formation of the (M-)Fls-APTES-FTO surface was verified and characterized throug...
Article
In this study, NiO-Ce0.8Sm0.2O1.9 (NiO-SDC) composite was synthesized through co-precipitation method by changing the NiO volume concentration from 45 to 65%. Then, experimentation was done to add La from 10 to 20 mol% in NiO-SDC composite. Finally, NiO-SDC composite was synthesized by the addition of 5–15 mol% hydrogen peroxide (H2O2) during co-pr...
Article
Full-text available
Fuel cell is undoubtedly widespread energy conversion technology, which can convert fuel (biogas) energy into electricity. Solid oxide fuel cell (SOFC) is one of the best choices among the fuel cell’s family due to high efficiency and fuel flexibility. In this study, zinc-based nanostructured Mn0.20FexZn0.80−xOδ electrode materials were successfull...
Article
Cu2 + and Fe3 + complexes of three flavonoids (morin or mo, quercetin or quer and primuletin or prim) were synthesized with the objective of improving antioxidant capacities of flavonoids. The radical scavenging activities of pure flavonoids and their metal complexes were assayed to monitor their tendencies towards sequestering of radicals at physi...
Article
The thermal, spectroscopic and electrochemical behavior of some novel ferrocene-containing polyesteramides and their siloxane-based block copolymers are described in the present study. The thermal properties of the organometallic materials were investigated by thermogravimetric analysis (TGA) and compared with their terephthaloyl- and isophthaloyl-...
Article
Advanced functional materials were synthesized to obtain catalytic compositions of CuO@CeO2 hybrid oxides (xCuO@CeO2, x = 5–25 wt%) by means of precipitation/impregnation method. Morphological characteristics of the materials were studied through FTIR, XRD, SEM, EDX, TEM and PSD analyses. Glassy carbon (GC) modified with these materials was used as...
Article
Full-text available
To enhance and optimize nanocatalyst ability for nitrophenol (4-NP) reduction reaction we look beyond Au-metal nanoparticles and describe a new class of Au nanoalloys with controlled composition for core of AuCu-metals and Pt-metal shell. The reduction of 4-NP was investigated in aqueous media spectroscopically on 7.8 nm Au nanospheres (AuNSs), 8.3...
Article
A series of γ-Al2O3 supported bimetallic catalysts CoIrx/γ-Al2O3 was prepared by wet impregnation method followed by air calcination and hydrogen reduction. The catalysts were characterized by using AAS, FTIR, XRD, N2 physisorption, TPR, TPO, and SEM equipped with EDX which show the formation of Co–Ir nanoalloy particles well dispersed on γ-Al2O3 s...
Article
Barium cerate and its zinc doped series, BaCe1-xZnxO3 with 0.02 <= x <= 0.16, were synthesized using ammonia as a co-precipitant. The influence of zinc on phase and morphology was characterized using XRD and SEM, respectively. XRD revealed orthorhombic crystallinity for x=0 to 14 mol% but distorted hexagonal phase for x = 16 mol%. SEM images reveal...
Article
Full-text available
Copper oxide impregnated γ-Al2O3 hybrid catalysts (5 to 25 wt%CuO@Al2O3) were prepared and characterized by XRD, FT-IR, SEM, and EDX. The redox properties of the materials were studied electrochemically which coincided well with the XRD and EDX analyses. Their catalytic properties were comprehended using electrochemical impedance, cyclic voltammetr...
Article
A series of single phase LiNi(1-x)CuxPO4 (0 < x < 0.99) was successfully synthesized by non-aqueous sol-gel method followed by microwave (MW) annealing. The advantage of MW short span annealing is obvious from the nanometer sized particles compared to reported microparticles. XRD, IR and SEM studies were conducted to investigate the phase purity, c...
Article
In this paper, B-site doping of an optimized A-site deficient composition, calcium-doped lanthanum strontium titanate, La0.2Sr0.25Ca0.45TiO3 (LSCTA�) with Ni and Fe is presented. The doped compositions were successfully synthesized by the Pechini method and then characterized by XRD, SEM, dilatometry, ac impedance, and dc conductivity. The doped an...
Article
Porous gamma-Al2O3 support with improved mechanical strength was synthesized via sol gel method in granular form having different mesh sizes i.e., 0.60-1.0 mm and 2.0-2.8 mm, followed by rehydration at room temperature and calcination at 1023 K, and was employed for the preparation of Ir and Ru catalysts by impregnation method. The structural featu...
Article
Full-text available
Herein, the cyclic voltammetric (CV) investigations of structurally similar bisnitrocompounds (N3, N4, N5, N6, having different--spacer length) is presented. CV study offered interesting interactional possibilities of bisnitrocompounds with chicken blood ds.DNA at physiological pH 4.7 and human body temperature, 310 K. The results indicated strong...
Article
Full-text available
Olivine type single phase LiNi(1-x)CuxPO4 (0 < x < 0.99) samples were successfully synthesized by non-aqueous sol-gel method followed by microwave (MW) annealing.. The phase purity, lattice parameters and morphology was confirmed by FTIR, XRD and SEM studies. X-Ray diffraction patterns of both the parent LiNiPO4 (LNP) and doped analogues were simil...