MnO2 Nanocomposites Research Articles

Insights into the electrochemical performance of manganese dioxide coated metallic foils as potential electrodes for supercapacitors

AbstractManganese dioxide (MnO2) is a promising electrode material for supercapacitors due to its high theoretical specific capacitance. In this study, MnO2 particles were synthesized using a simple hydrothermal method and subsequently coated onto silver, nickel, and aluminum foils via dip coating. The structural, morphological, and functional properties of the resulting MnO2 nanocomposites were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier-transform infrared spectroscopy (FT–IR). Electrochemical impedance spectroscopy (EIS), galvanostatic charge–discharge (GCD), and cyclic voltammetry (CV) were employed to investigate the electrochemical performance of the coated metallic foils. The results demonstrated that MnO2/Ag foils exhibited the highest specific capacitance of 198 F g–1 at a scan rate of 0.25 A g−1, accompanied by excellent cycle stability (89% capacitance retention). This performance surpassed that of MnO2/Ni and MnO2/Al foils, which exhibited maximum specific capacitances of 150 and 101 F g−1, respectively. Additionally, MnO2/Ag foils displayed the highest charge storage capacity, as evidenced by EIS analysis, reaching 4000 Ω, nearly double that of MnO2/Ni and MnO2/Al foils. These findings highlight the potential of cost-effective and high-performance MnO2/Ag foils for widespread applications in energy storage devices such as electrochemical capacitors. Graphical Abstract

Photocatalytic reduction of nitroarene derivatives by impressive visible-light active Co3O4-QDs/Mn3O4 nanocomposite

A visible light active Co3O4-quantum dots (QDs)/Mn3O4 nanocomposite was successfully synthesized by a straightforward precipitation approach. Notably, the formation of Mn3O4 nanosheets in composite structure was evidenced by different physicochemical techniques especially transmission electron microscopy (TEM), energy dispersive X-ray (EDX) and N2 sorption analyses, which indicated the uniform distribution of Co3O4-QDs with small size of around 5 nm on the surface of Mn3O4 nanosheets along with the enhancement of specific surface area for final composite. Also, the persistence of Co3O4-QDs during nanocomposite synthesis was analyzed by X-ray diffraction (XRD), FT-IR and TEM techniques. The diffuse reflectance UV–Vis and electrochemical impedance spectroscopies revealed the reduction of band gap energy and enhanced charge separation efficiency for Co3O4-QDs/Mn3O4 nanocomposite, respectively, which consequently led to improved photocatalytic response in comparison with bare Co3O4-QDs and Mn3O4 nanosheets. The as-prepared nanocomposite exhibited excellent photocatalytic activity in the reduction of a wide range of substituted nitroarenes with the yields of higher than 80 % relative to the corresponding arylamines, using N2H4·H2O as the hydrogen source and ethanol as green solvent at 25 °C and ambient pressure under visible light illumination. The synergistic effect could improve the production of active hydrogen atoms, therefore, the reasons for this transformation over the prepared nanocomposite under benign conditions are fully discussed. Furthermore, the nanocomposite could be easily recycled without decay in photocatalytic activity for at least five successive cycles.

Reduced graphene oxide–MnO2 nanocomposites by hydrothermal method for histamine sensor and photocatalytic activity

Reduced graphene oxide–MnO2 nanocomposites by hydrothermal method for histamine sensor and photocatalytic activity

Pemanfaatan Limbah Ban Bekas untuk Sintesis Nanokomposit MnO2/C dengan Metode Hidrotermal sebagai Material Superkapasitor

Activated carbon from waste tires is used as MnO2 metal oxide doping in making MnO2/C-based nanocomposites into high-density and environmentally friendly supercapacitor electrodes. The MnO2/C nanocomposite synthesis process was carried out using the hydrothermal method by varying the mass of activated carbon by 1.25 g, 2.5 g and 3.75 g to determine the optimum results. Based on the results of research that has been carried out, it shows that MnO2/C can be used as a high density supercapacitor electrode. This is in accordance with the XRD test results which show that the MnO2 nanocomposite with the addition of C was successfully synthesized and has an orthorhombic crystalline phase. The SEM test results show that the material has almost the same morphology, namely many protrusions which make each particle have high roughness. The most optimal results were obtained from the MnO2/C-50 variation because it has the highest C element content, namely 39.93%, so it has the highest capacitance value of 5.791 f/g during the CV test. The GCD test shows that electrodes with a carbon variation of 2.5 g have a much longer and constant charge-discharge measurement time. In the EIS test, this variation shows a resistance value that is not too high and not too small, materials that have good storage capacity or capacity have moderate resistance.

Synthesis of PPy-MnO2 Nanocomposite for Utilization in Supercapacitor Applications

Polypyrrole (PPy) nanocomposites were prepared using chemical oxidation and were combined with manganese oxide (MnO2) nanoparticles. The PPY-MnO2 nanocomposite was synthesized by integrating PPy nanofibers with varying volume ratio percentages of MnO2 dopant (10, 30, and 50% vol. ratio). The structural features of the PPy and PPy-MnO2 nanocomposite were investigated using X-ray diffraction (XRD). Fourier transfor infrared (FTIR) spectroscopy was used to demonstrate the molecular structures of primary materials and the final product of PPy, MnO2, and PPy- MnO2 nanocomposites. Field Emission Scanning Electron Microscopy (FESEM) showed that the morphology of PPy consisted of a network of nanofibers. Increasing the volume ratios of manganese oxide added to the PPY nanofiber led to the increase of manganese oxide nanoparticles on the surface of the PPY nanofiber network. This resulted in a noticeable alteration in the structure of the nanocomposite. It has been observed that the nanocomposites demonstrate a significant level of pseudocapacitive activity. The highest capacitance of 236 F/g was observed when pure PPy was doped with 30% MnO2 compared to 125 F/g of the pure PPy.

Fabrication of Na and K based MnO2 nanocomposites for supercapacitive applications

α-Na0.5Mn0.93O2@Na0.91MnO2 (NaMnO) and K0.48Mn1.94O5@Na0.91MnO2 (KNaMnO) nanocomposites have been synthesized using solid-state reaction method. FESEM results convey the formation of column-shaped morphology. FTIR exhibited a shift in the vibration frequency upon potassium loading. Cyclic voltammetric curves are scanned (0 V–0.8 V) at different scan rates (5 mV/s to 100 mV/s) in 1M KOH electrolyte. Galvanostatic charge-discharge characteristics, for different current densities, have shown non-linear or pseudocapacitive characteristics of the prepared electrodes. High specific capacitance of ∼361 F/g and ∼143 F/g, at a current density of 1A/g, has been achieved for KNaMnO and NaMnO samples, respectively. KNaMnO sample exhibited higher capacitive retention (116 %), up to 2000 cycles, and obeys lower series resistance, charge transfer resistance, and Warburg impedance parameters, thus, convey higher efficiency of this compound for supercapacitor applications.

Synthesis of GN/ MnO2 nanocomposite materials for photo-assisted supercapacitor with enhanced capacities

Supercapacitors with the advantages of high power density and rapid discharging rate have widespread applications in energy storage. Nevertheless, their development is hindered by the limitation of low specific capacity. Traditional approaches to enhance specific capacity primarily involve incorporating foreign atoms and blending with additional reactive substances. Herein, a photo-assisted supercapacitor electrode material (GN/MnO2 nanocomposite) with excellent capacity is developed. As a photoactive material, graphene generates electrons and holes with photoirradiation. As the photogenerated carriers increase, electrons are separated from the holes and stored as charges. Photoirradiation is the driving force that promotes the energy storage and conversion of supercapacitors. Although there are many reports on GN/MnO2 composites, there are still few reports on the photo-assisted energy storage of this composite material. The specific capacity of this photo-assisted GN/MnO2 electrode materials could reach 210 F/g with photoirradiation. It was higher than that without photoirradiation (170 F/g). The development of this study provides important theoretical guidance and practical significance for the research of photo-assisted energy storage materials, and plays a significant role in advancing the progress of energy storage devices with high specific capacity.

Unleashing nature’s energy: Enchanted Albizia amara leaf extract empowers supercapacitors with NdMn2O5 nanocomposite

The potential of using Albizia amara plant extract to synthesize environmentally-friendly Mn3O4, Nd2O3 nanoparticles (NPs) and NdMn2O5 nanocomposites (NCs) for supercapacitor applications was explored. Various techniques will be used to characterize the resulting nanocomposite and evaluate its electrical properties and electrochemical performance. The study will also investigate the impact of synthesis parameters on the nanocomposite properties and optimize them for enhanced supercapacitor performance. Additionally, the environmental sustainability of using Albizia amara plant extract as a green reducing agent will be assessed. The study found that NdMn2O5 nanocomposites possess 754 F/g specific capacitance at 0.5 A/g and concluded superior electrode material properties for supercapacitors compared to the Mn3O4 and Nd2O3 nanoparticles. Moreover, hybrid supercapacitor is employed in as-prepared NdMn2O5 as positive electrode and activated carbon as negative electrode. Assembled hybrid NdMn2O5//AC exhibits 42 Wh/kg specific energy and 379 W/kg power density. 94.34 % of coulombic efficiency and 76.11 % of capacitance retention was perpetuating after 15,000 cycles. The use of Albizia amara plant extract shows promise as green alternative, cost-effective and environmentally-friendly methods for synthesizing NdMn2O5 nanocomposites for energy storage devices.

Engineered g-C3N4/MnO2 Nanocomposite for Exceptional Photocatalytic Methylene Blue Degradation and Robust Antibacterial Impact

Engineered g-C3N4/MnO2 Nanocomposite for Exceptional Photocatalytic Methylene Blue Degradation and Robust Antibacterial Impact

Boosted charge separation via Ce2S3 over dual Z-scheme ZnO–Ce2S3–MnO2 core double-shell nanocomposite for the degradation of diverse dye pollutants

Herein, core double-shell direct dual Z-scheme ZnO–Ce2S3–MnO2 nanocomposite was synthesized via a hydrothermal route along with pure ZnO, Ce2S3, MnO2, and characterized by numerous characterization tools for application in synthetic dyes degradation. The XRD, Raman, and FTIR analyses have confirmed the nanocomposite formation. TEM images exhibited the core double-shell morphology with an average particle diameter of 81 nm and stacking of ZnO, Ce2S3, and MnO2. EDX confirmed the existence of desired elements in the grown composition. The varied oxidation states, presence of defects, and fast charge transfer were also revealed from XPS, PL, and EIS. The ZnO–Ce2S3–MnO2 nanocomposite has an optical energy bandgap of 2.84 eV, capable of decomposing harmful dyes with excellent efficiency, 99.81% MB, 97.62% MO, 88.5% MR, and 58.9% EY in 40 min sunlight exposure. The effect of several operating parameters is also observed and obtained results showed the optimal catalyst dose was 20 mg, pH of 8, and dye concentration of 10 ppm. The scavenger's experiment suggests that •O2− and •OH are the main active radicals in the photodegradation reaction which is also evident in the dual Z-scheme formation. The MnO2 and ZnO layers covered the Ce2S3 (core) and dual Z-scheme formation allows rapid kinetics of redox reaction and provides plenteous channels for transfer of photo-generated charge carriers during photocatalysis. Thus, core double-shell direct dual Z-scheme photocatalysts having inorganic components could be an excellent choice for photocatalysis at the industrial level, particularly for water purification.

Biosynthesis of Doped Carbon Dots-Decorated MnO2 Nanocomposites Using Eucalyptus Extract: Evaluation of Catalytic Activity

Biosynthesis of Doped Carbon Dots-Decorated MnO2 Nanocomposites Using Eucalyptus Extract: Evaluation of Catalytic Activity

Fabrication and assessment of CuO and NiO-infused MnO2 nanocomposites: Characterization, methylene blue degradation, and antibacterial efficacy

This study employed the solid combustion method to fabricate CuO and NiO-doped MnO2 nanocomposites (MnNCs). Various spectral techniques confirmed their structural integrity. The Ultraviolet-Visible (UV–Vis) spectrum of the nanocomposites revealed peaks at 466 nm, ascribed to the bandgap and enhance the visible light absorption. The crystalline structure of the nanocomposites was confirmed by X-ray diffraction method. The scanning electron microscopy (SEM) images displayed a dumbbell and spherical shapes, while Transmission Electron Microscope (TEM) showed hexagonal, octahedral, and spherical particles. The elemental composition and oxidation state of MnNCs composites were verified by Energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). The EDS analysis results indicate that the prepared composites contain a reasonable amount of Mn, Cu, Ni, and O atoms. Additionally, based on the XPS results, the estimated percentages of Mn, Cu, Ni, and O are 49.48%, 8.79%, 11.84%, and 22.91%, respectively. The MnNCs-2 composites exhibit superior photocatalytic activity compared to MnO2 and MnNCs-1. Within 100 min, the MnNCs-2 nanocomposites demonstrate an 89.05% efficiency in degrading MB dye. The synthesized MnNCs nanocomposites are found to be extremely toxic against Gram-positive bacteria, Staphylococcus aureus (S. aureus), Streptococcus pyogenes (S. pyogenes), and Gram-negative bacteria, Escherichia coli (E. coli), and Klebsiella pneumoniae (K. pneumoniae). This study underscores the potential of MnNCs nanocomposites as versatile photocatalysts and antibacterial agents

Synthesis and characterization of highly efficient Te-doped Mn3O4 and s-g-C3N4 /Te- Mn3O4 nanocomposites as an excellent antimicrobial and photocatalytic agent

This work aims to synthesize manganese oxide nanoparticles (Mn3O4NPs) using a co-precipitation method and analyzed them through XRD, SEM and FT-IR. The XRD analysis confirmed the tetragonal hausmanite structure of the Mn3O4 NPs, while SEM revealed an average particle size of 9–20 nm. Kinetic studies demonstrated the efficient photooxidation of methylene blue with first-order kinetics under UV or visible light. Degradation efficiencies varied between 82% and 93% depending on the light source. Furthermore, we used the zone inhibition approach to assess the antibacterial potency of various Mn3O4 NP contents alongside human pathogenic bacteria, namely Escherichia coli and Staphylococcus aureus. The results of the qualitative antibacterial tests revealed that E. coli, a Gram-negative bacterium, is more sensitive to Mn3O4 NPs than are Gram-positive bacteria, with a maximum zone diameter of 28 mm (S. aureus). Alternatively, it was determined that S-g-C3N4/Te-Mn2O3 had the maximum antifungal activity against Alternaria solani at 28.9 mm and against. Colletotrichum gloeosporioides at 47.3 mm.

Sensitive voltammetric determination of rifaximin by electrode modified by nanocomposite of MWCNT/MnO2/Au NPs

Antibiotics are a group of antimicrobial compounds that are used in human medicine, aquaculture, and the livestock industry to treat and prevent disease and improve growth. However, improper use of antibiotics may lead to antibiotics entrance in the environment through water and land, which may cause various toxic effects. Therefore, it is necessary to use easy, fast and sensitive methods like electrochemical methods to detect them. Herein, Au-decorated Multi-walled carbon nanotubes (MWCNTs) /MnO2 nanocomposites which seems as a Gypsophila paniculata flower were utilized to detection of Rifaximin (RFX). In this method MWCNT/MnO2 nanocomposites were first drop-casted onto the GCEs then the electro-deposition of Au NPs onto the modified GCEs was done. The formation and electroanalytical performance of the fabricated sensor were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) Spectroscopy, X-ray diffraction (XRD), cyclic and linear sweep voltammetry (LSV). The LSV response of the electrode to RFX was linear in the range 0.75–200μΜ with a detection limit of 0.25 μM, a sensitivity of 0.38μA μM−1 cm−2 and the relative standard deviation (RSD) of 7.0 % under the optimum conditions. Besides, the RFX is successfully measured in human blood serum and RFX tablet samples, in conditions close to the physiological environment (pH = 6) without any sample pre-treatment. The stability, reproducibility, and repetitive usability exhibited by the fabricated modified electrode are very good to make it a suitable electrochemical sensor for the determination of RFX in pharmaceutical preparations and its quality control and moreover in real samples.

A Highly Sensitive Luminescent Upconversion Nanosensor for Turn-On Detection of As3.

A luminescent nanoprobe (NP), MnO2-modified Er3+/Yb3+-codoped Ag2MoO4 upconversion nanoparticles (UCNPs; cod-AMO-3/MnO2), was constructed for rapid, sensitive, and selective "turn-on" detection of trace As3+. Herein, two kinds of luminescent NPs were developed based on luminescence resonance energy transfer (LRET) between cod-AMO-3 as the energy donor and MnO2 as the energy acceptor. By using MnO2 as the matrix in cod-AMO-3/MnO2 fluorometric assay, the upconversion luminescence (UCL) intensity (IUCL) of the cod-AMO-3 probe was quenched significantly through LRET, illustrating MnO2 as an efficient quencher for UCL. With the addition of As3+, a stable bidentate binuclear (BB) corner-sharing bridged complex (As5+-MnO2) was probably formed, which alters the surface of the upconversion NP, leading to gradual separation between UCNPs and MnO2 and subsequent recovery of IUCL. Interestingly, it possessed superior sensitivity, reaction kinetics, and also high selectivity toward As3+ in aqueous solution. Our optimized cod-AMO-3/MnO2 nanocomposite (NComp) demonstrated a linear range of 0-150 ppb and an ultrasensitive detection limit of 0.028 ppb for As3+, which is extremely below the regulatory level, signifying the promising practical usage of this system. To the best of our knowledge, such a surface-modified Ln3+-codoped Ag-based nanosensor being applied for As3+ detection probably has not been reported yet, and it is rather unexplored. In a nutshell, the ability to monitor the As3+ concentration may enable the rational design of a convenient platform for a diverse range of environmental monitoring applications.

Characterization of Mn3 O4 -MnO2 nanocomposites biosynthesized by cell lysate of Haloferax alexandrinus GUSF-1.

Manganese oxide nanocomposites attract huge attention in various biotechnological fields due to their extensive catalytic properties. This study reports an easy, rapid, and cost-effective method of using the cell lysate of haloarchaeon, Haloferax alexandrinus GUSF-1 for the synthesis of manganese oxide nanoparticles. The reaction between the cell lysate and manganese sulfate resulted in the formation of a dark brown precipitate within 48 h at room temperature. The X-ray diffraction pattern showed the existence of Mn3 O4 and MnO2 phases consistent with the JCPDS card no. (01-075-1560 and 00-050-0866). The dark brown colloidal suspension of MnO3 -MnO2 in methanol showed maximum absorption between 220 and 260 nm. The EDX spectrum confirmed the presence of manganese and oxygen. The Transmission electron microscopy revealed the spherical morphology with an average particle size between 30 and 60 nm. The magnetic moment versus magnetic field (MH) curve, at room temperature (300 K) did not saturate even at a high magnetic field (±3T) indicating the paramagnetic nature of the prepared nanocomposite. The Atomic Emission Spectroscopic analysis showed a negligible amount of soluble manganese (0.03 ppm in 50 ppm) in the Mn3 O4 -MnO2 suspension suggesting the maximum stability of the material in the solvent over time. Interstingly, Mn3 O4 -MnO2 nanocomposites evidenced antimicrobial activity in the order of Pseudomonas aeruginosa > Salmonella typhi > Escherichia coli > Proteus vulgaris > Candida albicans > Staphylococcus aureus. Conclusively, this is the first report on the formation of Mn3 O4 -MnO2 nanocomposites using cell lysate of salt pan haloarcheon Haloferax alexandrinus GUSF-1 with antimicrobial potential.

Effect of RGO-MoS2/MnO2 nanocomposites with high catalytic activity on the combustion of AP/HTPB composite propellant

A novel RGO-MoS2/MnO2 (RSM) nanocomposite catalyst was effectively constructed by in situ hydrothermal method. RSM nanocomposite was constructed by using RGO-MoS2 composite as a substrate and in situ MnO2 as a catalytic core. Various characterization tests were used to prove the successful preparation of RSM nanocomposite and the results showed that RSM-3 exhibited a network-loaded nanoparticle structure with lots of active sites. During catalytic and combustion experiments, RSM-3 showed significant catalysis for AP decomposition. The catalytic experiment results showed that RSM-3 (2.0 wt%) could highly decrease AP decomposition temperature to about 327.8 ºC and enhance the heat release to 1530.4 J‧g−1. RSM-3 (2.0 wt%) dramatically decreased the Ea of HD stage by 112.7 kJ·mol−1. It also shortened the ignition delay time of AP/HTPB propellants by 61.8% and increased the mass burning rate by 148%. Excellent catalytic performance of RSM-3 might be owing to the synergy of metal-carbon structure of RGO-MoS2 and MnO2 nanoparticles. This work provides a new direction for the synthesis of novel catalyst materials with high catalytic activity.

Impetus Yield of Acrylic Top Cover Pyramid Solar still due to Furthered Thermal Conductivity of MnO<sub>2</sub> and PANI-MnO<sub>2</sub> Nanocomposite Materials

Attempts to study the effect of blend MnO2 and PANI-MnO2 nanocomposites in enhancing the productivity of an acrylic Pyramid Solar Still (PSS) is carried out. Synthesized nanocomposites assorted with black paint to improve the absorption efficiency. Size of the synthesized MnO2 is found to be 35nm. SEM image infers particles are aggregates with random shape. Thermal analysis if distillate yield confirms the formation of nanocomposite with improved thermal stability of the PANI. Distillate yield is observed around 0.484 litre/0.25m2, 0.568 litre/0.25m2 and 0.615 litre/0.25m2 still without and with MnO2 and PANI-MnO2 nanocomposites. Average efficiency is found to be 23.05%, 26.63% and 28.52% under three modes. Efficiency of the combined performance is amended due to the absorption properties of MnO2 and PANI-MnO2. Performance ratio under three modes are found to be 5.52 %, 6.44 % and 6.93 %. Results concluded that saturation vapour pressure and latent heat also plays a major hole in production of distillate yield.

Effective drug combinations of betulinic acid and ceranib-2 loaded Zn:MnO2 doped-polymeric nanocarriers against PC-3 prostate cancer cells

The development of theranostic nanocarriers with synergistic drug combinations has received considerable attention due to their improved pharmaceutical activity. Herein, we reported an investigation about the in-vitro anticancer activity of ceranib-2 (Cer), betulinic acid (BA), and the combination of betulinic acid and ceranib-2 (BA-Cer) against PC-3 prostate cancer cells. For this purpose, first we designed a suitable nanocarrier using a novel Zn:MnO2 nanocomposite (NCs) and gallic acid (GA)-polylactic acid (PLA)-Alginate polymeric shell with nanoscale particle size and good stability. Chemical statements, morphology, and physicochemical properties of the nanocarrier have been illuminated with advanced characterization techniques. According to the transmission electron microscopy (TEM) results, Zn:MnO2 NCs had a spherical and monodispersed morphology with a 2.03 ± 0.67 nm diameter. Moreover, vibrating-sample magnetometer (VSM) results showed that Zn:MnO2 had paramagnetic properties with a saturation magnetization (Ms) value of 1.136 emu/g. Additionally, the in-vitro cytotoxic effects of the single and binary drugs loaded Zn:MnO2-doped polymeric nanocarriers against PC-3 prostate cancer cells were investigated. According to the results, there was no significant cytotoxic effect of free BA and Cer against PC-3 prostate cancer cells. However, BA/Zn:MnO2@GA-PLA-Alginate NCs, BA-Cer/Zn:MnO2 @GA-PLA-Alginate NCs and free BA-Cer had IC50 values of 6.498, 7.351, and 18.571 μg/mL, respectively. Consequently, BA-Cer/Zn:MnO2@GA-PLA-Alginate is a nanocarrier with good stability, enhanced drug loading and release capacity for hydrophobic drugs, as well as being used as both imaging and treatment agent due to its magnetic properties. Furthermore, BA and Cer drug combination showed great promise in prostate cancer therapy which is known to be resulted high drug resistance. We strongly believed that this work could lead to an investigation of the molecular mechanisms of BA-mediated cancer theapy.

High aspect ratio TiO2–Mn3O4 heterostructure: proficient nanorods for pathogen inhibition and supercapacitor application

ABSTRACT Supercapacitors are in great demand owing to necessity of clean and sustainable energy. Alternately, waterborne microbial infections are prime cause of diseases. So, there is demand for synthesis of novel materials with multifunctional adaptability. Herein, heterostructured TiO2–Mn3O4 composite nanorods were synthesised by two-step methods. In first step, TiO2 nanorods were prepared using electrospinning and by hydrothermal method Mn3O4 nanoparticles were attached to TiO2 surface. The composite heterostructure was described using sophisticated procedures such as X-ray diffraction, Fourier transforms infrared spectroscopy, Scanning electron and Transmission electron microscopy. Antimicrobial studies were probed against Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus pathogens. The results demonstrated that TiO2–Mn3O4 composite has more heightened antimicrobial activity than pristine TiO2. Additionally, the synthesised TiO2–Mn3O4 composite was implied as an electrode for supercapacitors. The definite capacitance of TiO2–Mn3O4 nanocomposite calculated at a potential scan rate of 5 mV/s was as amplified as 470 Fg−1.