Mn Doping Research Articles

Pressure-Modulated Interface Engineering toward Realizing Core@Shell Configuration Transition.

The strained interface of core@shell nanocrystals (NCs) can effectively modulate the energy level alignment, thereby significantly affecting the optical properties. Herein, the unique photoluminescence (PL) response of doped Mn ions is introduced as a robust probe to detect the targeted pressure-strain relation of CdS@ZnS NCs. Results show that the core experiences actually less pressure than the applied external pressure, attributed to the pressure-induced optimized interface that reduces the compressive strain on core. The pressure difference between core and shell increases the conduction band and valence band offsets and further achieves the core@shell configuration transition from quasi type II to type I. Accordingly, the PL intensity of CdS@ZnS NCs slightly increases, along with a faster blue-shift rate of PL peak under low pressure. This study elucidates the interplay between external physical pressure and interfacial chemical stress for core@shell NCs, leading to precise construction of interface engineering for practical applications.

Synthesis of Pure and Manganese Doped Zinc Oxide Nanoparticles by a Solution Growth Technique: Structural and Optical Investigation

Pure and manganese doped zinc oxide nanoparticles have been successfully synthesized over the composition range, Zn1-xMnxO (0<x<0.5), by a solution growth process. The effect of Mn doping on the structure, morphology and optical properties were investigated by several techniques. X-Ray diffraction studies confirmed the formation of a single-phase polycrystalline hexagonal wurtzite structure of ZnO within the range, 0 < x < 0.3. No Mn related secondary phases were detected, within this range, which could be attributed to the fact that the dopant atoms had been well incorporated into the ZnO crystal lattice. For Zn1-xMnxO (x = 0.5), several low intensity peaks belonging to remnants of Manganese acetate were observed in the diffractogram, establishing a solubility limit for the synthesis technique used. The variation of d-spacing with Mn percent doping showed a very good agreement with Vergard’s law within the range (0<x<0.25). EDAX analysis of the nanoparticles was consistent with the formation of Mn doped ZnO. The optical band gap of the ZnO nanoparticles decreased linearly with increasing Mn percent doping, suggesting the possibility of tuning the band gap of ZnO by doping with Mn.

Non-stoichiometric TbFe2Mnx compounds: Magnetic anisotropy, magnetostriction and thermal expansion

In magnetostrictive RFe2 (R – rare earth) materials, magnetic properties such as magnetocrystalline anisotropy and Curie temperature can have a profound impact on the magnetostriction, often reducing its value in practically applicable magnetic field at normal conditions. Tuning the atomic structure by Mn alloying is one of the research strategies that allows to improve both elastic and magnetoelastic properties. Here we investigate novel non-stoichiometric TbFe2Mnx (0 ≤ x ≤ 0.25) compounds in which Mn partially replaces both Tb and Fe. Curie temperature and magnetic moment values decrease with manganese alloying. We interpret these effects as a consequence of lowered Fe-Fe exchange interactions which is confirmed within two-sublattice molecular field model. Magnetocrystalline anisotropy estimated by law of approach to magnetic saturation in high pulsed magnetic fields shows trend of decrease with Mn doping. Notably, this cause significant increase of linear magnetostriction (up to 25%) for TbFe2Mnx compounds at liquid nitrogen temperature. Thermal expansion declined due to growth of magnetic contribution in magnetically ordered state, which is linked to volume magnetostriction. These changes make TbFe2Mnx promising material for practical application. Thus, it was shown that manganese alloying opens new way for tuning magnetocrystalline anisotropy and magnetostriction in non-stoichiometric Laves phase compounds.

Hyperfine splitting and ferromagnetism in CdS : Mn nanoparticles for optoelectronic device applications

Manganese (Mn) doped cadmium sulphide (CdS) nanoparticles were synthesized using a chemical method. It was possible to decrease CdS : Mn particle size by increasing Mn concentration. Investigation techniques such as ultraviolet−visible (UV−Vis) absorption spectroscopy and photoluminescence (PL) spectroscopy were used to determine optical properties of CdS : Mn nanoparticles. Size quantization effect was observed in UV−Vis absorption spectra. Quantum efficiency for luminescence or the internal magnetic field strength was increased by doping CdS nanoparticles with Mn element. Orange emission was observed at wavelength ~630 nm due to 4T1 → 6A1 transition. Isolated Mn2+ ions arranged in tetrahedral coordination are mainly responsible for luminescence. Luminescence quenching and the effect of Mn doping on hyperfine interactions in the case of CdS nanoparticles were also discussed. The corresponding weight percentage of Mn element actually incorporated in doping process was determined by atomic absorption spectroscopy (AAS). Crystallinity was checked and the average size of nanoparticles was estimated using the X-ray diffraction (XRD) technique. CdS : Mn nanoparticles show ferromagnetism at room temperature. Transmission electron microscopy (TEM) images show spherical clusters of various sizes and selected area electron diffraction (SAED) patterns show the polycrystalline nature of the clusters. The electronic states of diluted magnetic semiconductors (DMS) of Ⅱ−Ⅵ group CdS nanoparticles give them great potential for applications due to quantum confinement. In this study, experimental results and discussions on these aspects have been given.

New insights into the formation mechanism of the multicomponent carbides (Nb, M)C (M = Ti, Cr and Mn)

Combining first-principles calculations and classical nucleation theory, the results of elemental doping on the structure, electrons and stability of niobium carbides are investigated. Ti, Cr and Mn doping altered the physical characteristics of the carbides, resulting in lower mismatch strains and interfacial energies between the carbide and the substrate. Elemental doping reduced the critical nucleation size of carbides and contributed to the promotion of carbide nucleation. However, excessive doping with Cr and Mn increases the formation energy of carbides and unfavorable to carbide stabilization. Therefore, Cr and Mn are involved in the early elemental aggregation of carbides, while Ti and Nb are the main carbide-forming elements. The nano-precipitated phases of various compositions produced in niobium microalloyed steel were experimentally validated utilizing transmission electron microscopy (TEM) and three-dimensional atom probe tomography (3D-APT). The carbides primarily composed of Nb, Ti and C elements, with the presence of Cr and Mn in the core region leading to the formation of a core-shell structure, which is consistent with theoretical calculations.

Efficient heterogeneous activation of peroxymonosulfate by manganese-doped LaCoO3 perovskites for metronidazole degradation: A mechanistic study and reaction pathways

Herein, manganese-doped perovskites LaCo1−xMnxO3 (x = 0, 0.05, 0.1, and 0.2) were synthesized by the so-gel process to dominantly activate PMS for Metronidazole (2-methyl-5-nitroimidazole-1-ethanol (MNZ) degradation. The results revealed that the MNZ degradation rate under the LaCo0.8Mno.2O3/PMS system reached 99.42 % in 30 min with a rate constant of 0.1616 min−1, which is significantly higher than the LaCoO3/PMS system under optimal reaction conditions (LaCo0.8Mn0.2O3 = 0.4 g/L, [PMS] = 0.4 mM, [MNZ] = 15 mg/L, pH = 7, T = 25 ± 2 °C). LaCo0.8Mn0.2O3 has demonstrated a higher surface area (44.35 m2g−1) as compared to pristine LaCoO3 (7.89 m2g−1), suggesting that Mn doping remarkably improves the catalytic activity and provides more active sites to the LaCo0.8Mn0.2O3/PMS to increase MNZ degradation efficiency. Meanwhile, the impact of various influencing factors and associated anions on MNZ degradation was examined. On the surface of LaCo0.8Mn0.2O3, photogenerated electrons and the conversion of Co2+/Mn3+ to Co3+/Mn4+ both played a part in PMS activation for MNZ degradation. The changes in valence states of elements were further corroborated through XPS analysis, which confirmed the potential application of the LaCo0.8Mn0.2O3 catalyst in MNZ degradation process. The generation of SO4•−,HO•, and 1O2 was confirmed through radical quenching studies and further validated by EPR measurements. It is evident from results that SO4•−, contributed significantly towards the degradation of MNZ along with minor role of HO•, and 1O2. This study presents insight into the improvement of new perovskite catalysts for the elimination of organic pollutants in water.

Promoting mechanism of Mn doping on the NH3-SCR reaction over the Fe/γ-Al2O3 catalyst surface

To verify the superiority of Mn-Fe dual-component doped catalysts in terms of deNOx performance, the differences of mechanisms in selective catalytic reduction with ammonia (NH3-SCR) between Fe/γ-Al2O3 and Mn-Fe/γ-Al2O3 catalysts were investigated by using the density functional theory (DFT). On the surface of the Fe/γ-Al2O3 catalyst, the NH2 group generated by NH3 dehydrogenation can react with NO and NO2 to form NH2NO and NH2NO2, respectively. The decomposition process of NH2NO is established as the rate-determining step in the reaction between NH3 and NO, while the rate-determining step in the reaction between NH3 and NO2 is the decomposition of NHNO2. Mn doping significantly enhances the catalyst's adsorption performance for O2 and oxidation ability toward NO, thereby promoting the production of NO2. Additionally, Mn doping markedly reduces the reaction barriers, facilitating the dissociation of NH2NO and NHNO2 on the Mn-Fe/γ-Al2O3 catalysts. These findings may elucidate the reasons of the effective enhancement of deNOx performance in the Mn-doped Fe/γ-Al2O3 catalysts, which establishes a foundation for the subsequent development and application of Mn-Fe bimetallic-doped SCR deNOx catalysts.

Self–Supporting Mn–RuO2 Nanoarrays for Stable Oxygen Evolution Reaction in Acid

Currently, the process of an acidic oxygen evolution reaction (OER) necessitates the use of Iridium dioxygen (IrO2), which is both expensive and incredibly scarce on Earth. Ruthenium dioxygen (RuO2) offers high activity for acidic OERs and presents a potential substitution for IrO2. Nevertheless, its practical application is hindered by its relatively poor stability. In this study, we have developed Mn–doped RuO2 (Mn–RuO2) nanoarrays that are anchored on a titanium (Ti) mesh utilizing a two–step methodology involving the preparation of MnO2 nanoarrays followed by a subsequent Ru exchange and annealing process. By precisely optimizing the annealing temperature, we have managed to attain a remarkably low overpotential of 217 mV at 10 mA cm−2 in a 0.5 M H2SO4 solution. The enhanced catalytic activity of our Mn–RuO2 nanoarrays can be attributed to the electronic modification brought about by the high exposure of active sites, Mn dopant, efficient mass transfer, as well as the efficient transfer of electrons between the Ti mesh and the catalyst arrays. Furthermore, these self–supported Mn–RuO2 nanoarrays demonstrated excellent long–term stability throughout a chronoamperometry test lasting for 100 h, with no discernible changes observed in the Ru chemical states.

Solvent/ligand free synthesis of Mn-doped CsPbCl3 perovskites with enhanced fluorescence for color sensor of bromide ions

For the detection of anions from wastewater, the perovskite materials synthesized should have suitable stability and be as hydrophilic as possible, and it’s not appropriate to introduce organic ligands. Mechanochemical reaction can avoid the use of organic solvents and provide improved stability for the perovskite materials due to their large particle size and compact structure, but their fluorescence is often too weak. To solve this problem, the Mn2+ doping effect was introduced into the CsPbCl3 crystals, and their synthesis doping strategies driven by mechanical grinding were systematic studied. The optimal Mn2+-doped CsPbCl3 (CsPbCl3:Mn) product was obtained by optimizing the synthesis conditions of Mn2+ source, grinding time on each reaction stage, Mn: Pb feeding ratio, and the sintering temperature. CsPbCl3:Mn had the same crystal structure as its undoped counterpart, while an obvious photoluminescence emission peak at 604 nm was obtained, which was originated from the doped Mn2+ ions. CsPbCl3:Mn had good stability against the ethanol environment and there was no organic ligands to hinder the ion exchange between Cl- and Br- from wastewater. Through testing the color difference of the resultant powders, a linear relationship with high correlation coefficient above 0.99 was established between chroma and Br- concentrations, and the Br- concentration in wastewater was accurately determined, demonstrating a promising application prospect of CsPbCl3:Mn in the fast detection of Br- ions.

Crystal structure, magnetism, electronic structure and effect of electron doping in ThCrAsN: An ab-initio study

In this work, we use first principles methods, to predict a mechanically and dynamically stable crystal structure of ThCrAsN which is iso-structural to ThXAsN (X = Mn,Fe,Co,Ni). We have investigated its mechanical, thermal, magnetic and electronic properties. Our calculation reveals that the magnetic ground state of ThCrAsN is G-AFM. Bader charge analysis reveals a significant inter-layer charge transfer between ThN and CrAs layers. Electronic structure of ThCrAsN is thoroughly investigated by evaluation of density of states, band structure and FSs for NM as well as G-AFM phases. Our calculation predicts a metallic behaviour for both the phases. Existence of FS pockets, consisting of multiple Cr-d orbitals at different parts of the Brillouin zone is observed. The influence of electron correlation effects on the electronic structure of ThCrAsN has been investigated using the Hubbard model. We also evaluate Lindhard response function to study the FS nesting which indicate a stronger FS nesting along Γ-X direction as compared to the Γ-M direction. Furthermore, we have examined the alterations in the density of states resulting from the partial substitution of Cr atom with Mn atom in ThCrAsN. Our findings suggest the occurrence of a metal-insulator transition in ThCrAsN upon Mn doping.

Modulation Mechanism of Transition Elements Fe and Mn on the Interface Bonding Performance of Bronze/Diamond Composites

The modulation mechanism of iron (Fe) and manganese (Mn) in transition‐metal elements on the interface bonding and mechanical properties of bronze (Cu3Sn)‐based/diamond composites is investigated through first‐principles calculations. Transition‐elements‐doping scenarios are investigated employing six‐layer slab models. It is revealed that the doping of Fe or Mn can make the Cu3Sn/diamond interface more stable, which effectively improves the wettability of the Cu3Sn/diamond interface based on the calculation results and analysis of interface energy, differential charge density model, and density of states. However, co‐doping with both Fe and Mn weakens the wettability of the Cu3Sn/diamond interface. Finally, wettability tests and microstructure characterizations demonstrate that the doping of Fe and Mn represents an effective approach to controlling the interface bonding performance of bronze/diamond composites.

Study of tribological property of laser-cladded FeCoCrNiMnx high-entropy alloy coatings via experiment and molecular dynamics simulation

Laser cladding was used to fabricate the high entropy alloy (HEA) coating of FeCoCrNiMnx (x = 0, 0.5, 1). Coatings were studied to determine how Mn affected the microstructure, microhardness, and tribological property. Molecular dynamics simulations were used to examine the atomic-scale deformation and wear behavior of FeCoCrNiMn HEA coatings. FeCoCrNiMnx HEA coatings were composed of single FCC-type solid solution. Friction reduction and wear resistance are improved with Mn doping. When compared to the substrate and FeCoCrNi coating, the wear resistance of Mn1 coating is superior by 69.34% and 25.05%, respectively (wear rate is 3.74 ×10−5 mm3/N·m). The findings of molecular dynamics simulations demonstrate that Mn-doping significantly enhances strain hardening by the friction-induced FCC phase transition to the HCP phase. The deformation mechanism of Mn1 coating, as determined by the dislocation evolution pattern, is twinning induced plasticity, which improves the plasticity, strength, and work-hardening rate of coating all at once.

Largely Enhanced Thermoelectric Power Factor of Flexible Cu2-xS Film by Doping Mn.

Copper-sulfide-based materials have attracted noteworthy attention as thermoelectric materials due to rich elemental reserves, non-toxicity, low thermal conductivity, and adjustable electrical properties. However, research on the flexible thermoelectrics of copper sulfide has not yet been reported. In this work, we developed a facile method to prepare flexible Mn-doped Cu2-xS films on nylon membranes. First, nano to submicron powders with nominal compositions of Cu2-xMnyS (y = 0, 0.01, 0.03, 0.05, 0.07) were synthesized by a hydrothermal method. Then, the powders were vacuum-filtrated on nylon membranes and finally hot-pressed. Phase composition and microstructure analysis revealed that the films contained both Cu2S and Cu1.96S, and the size of the grains was ~20-300 nm. By Mn doping, there was an increase in carrier concentration and mobility, and ultimately, the electrical properties of Cu2-xS were improved. Eventually, the Cu2-xMn0.05S film showed a maximum power factor of 113.3 μW m-1 K-2 and good flexibility at room temperature. Moreover, an assembled four-leg flexible thermoelectric generator produced a maximum power of 249.48 nW (corresponding power density ~1.23 W m-2) at a temperature difference of 30.1 K, and had good potential for powering low-power-consumption wearable electronics.

Bandgap engineering of BZT-BCT by Mn doping and the emerging strong photo-pyroelectric effect

Developing narrow bandgap ferroelectrics with a sizable polarization presents great potential toward photoelectric applications. Unfortunately, most ferroelectrics exhibit wide bandgaps, while lowering their bandgaps constantly accompanies the serious deterioration of ferroelectricity. By utilizing the Jahn-Teller (J-T) effect of Mn ion, here we report an exception of lead-free ferroelectric 0.5Ba(Zr0.2-xTi0.8Mnx)-0.5(Ba0.7Ca0.3)TiO3 ceramics showing narrow bandgaps and large polarizations. Especially for the composition x = 0.12, a low bandgap of 1.2 eV with a high residual polarization 9.9 µC/cm2 is achieved. Further investigations indicate that it has negligible photovoltaic effect due to the high density of point defects, but a significant improvement in near-infrared (NIR) light induced pyroelectric response, driven by the simultaneously increased photothermal conversion ability and room temperature pyroelectric coefficient. The pyroelectric device as demonstrated shows excellent linear dependence on the NIR light intensity with current and voltage sensitivities of 0.169 nA/(mW/cm2) and 0.052 V/(mW/cm2), respectively. Furthermore, the device possesses substantial pyroelectric response to the infrared irradiation from human body and excellent anti-interference ability. This study not only find an excellent lead-free ferroelectric composition for human body recognition, but also provide a new strategy of materials design for light energy harvesting and photodetection.

Exploration of temperature driven conduction process and ferroelectric properties of Mn doped GdCrO3

This work delivers the research findings of the temperature dependent DC resistivity, AC impedance and ferroelectric polarization of GdCr1−xMnxO3 (x = 0 and 0.3). Mixed valence states of Cr (Cr3+ and Cr4+) are explored using the x-ray photoelectron spectroscopy analysis. The exponential decay of DC resistivity on escalating the temperature advocates the semiconducting-like nature for the probed samples. The DC resistivity data of these samples fit well into small-polaron hopping and variable range hopping models. The impedance attributes of these samples were scrutinized over a broad spectrum of temperatures at selected frequencies. The values of the real and imaginary parts of impedance unveil substantial reduction on raising the temperature, thereby signifying the increase in conductivity of the samples. Pristine sample displays an electrical relaxation peak at 65 °C, which translates towards the lower temperature at higher frequencies. Further, the semicircular behavior of Nyquist plots at higher temperatures indicates the reduction of the charge transfer resistance. The equivalent circuits of Nyquist plots are generated using Z-view software. From these plots, it is perceived that grain boundary resistance upsurges while the grain resistance and capacitance drops upon doping. The ferroelectric measurements reveal that the coercive field (Ec) values decrease whereas the values of maximum polarization (Pm), remnant polarization (Pr) and energy storage increase in 30% doped GdCrO3. These observations establish that electrical and ferroelectric properties of GdCrO3 system can be tuned with appropriate Mn doping.

Enhanced photocatalytic performance of Mn-doped CeO2 nanoribbons for VOCs degradation: Investigating charge rearrangement and local electric field effects

In this study, we investigate Mn-doped CeO2 nanoribbons as photocatalysts to address the issue of performance enhancement in volatile organic compounds (VOCs) removal. Our primary focus centers on elucidating the interplay between charge rearrangement and local electric field (LEF) effects to uncover how these key factors collectively contribute to the improved photocatalytic performance. The successful doping of Mn atoms into the CeO2 lattice resulted in a strong dopant/matrix interaction effect. In situ XPS and density functional theory (DFT) calculations confirmed significant local charge rearrangement due to the dopant-induced local electric field, promoting charge carrier separation. The Mn dopant facilitated the generation of superoxide and hydroxide radicals. DFT simulations showed that Mn doping promoted VOCs adsorption on CeO2, favoring the subsequent oxidation process. The Mn-doped CeO2 nanoribbons achieved enhanced photodegradation performance of HCHO and CH3COCH3 compared to CeO2. This work aims to provide guidance and insights for the development of advanced photocatalysts.

Novel nickel-doped CoMnxSe2 Chalcogenides for boosting hydrogen evolution and urea oxidation

In the process of electrocatalytic hydrogen evolution, the use of non-polluting and cost-effective dual-functional non-precious metal catalysts is crucial. This study initially prepared CoMnSe2 on nickel foam via a solvothermal method. By adjusting the doping ratio of Mn, the catalytic performance is further optimized, with the best performance achieved at a Mn doping level of 0.3 mmol (CoMn0.3Se2). To enhance its catalytic kinetics, a metal nickel layer is deposited on CoMn0.3Se2/NF through electrodeposition, and the influence of electrodeposition time (300, 500, 700 s) on its performance was investigated. The results demonstrated that at an electrodeposition time of 500 s, NiCoMn0.3Se2/NF-5 exhibited the best electrocatalytic performance. For the hydrogen evolution reaction, it reached −193 mV@100 mA cm−2, while for the urea oxidation reaction, it achieved 1.395 V@100 mA cm−2. A dual-electrode electrolysis cell is established using Ni–CoMn0.3Se2/NF-5 as both the cathode and anode. In comparison, the cell voltage (1.6 V at 100 mA cm−2) is lower than other materials. The research provides a creative solution for the synthesis of high-performance dual-function catalysts.

Enhanced thermoelectric performance of CuSbSe2 via Mn doping

Ternary chalcostibite CuSbSe2 compound is known for low thermal conductivity. However, the poor electrical properties severely limit its thermoelectric performance. In this study, the Mn-doped CuSb1-xMnxSe2 (x = 0–0.04) samples were synthesized by vacuum melting with spark plasma sintering, and their thermoelectric properties were characterized. The results indicate that the impurity phase Cu3SbSe3 will be generated when Mn content x > 0.02, and the carrier concentration and mobility were optimized significantly for the Mn-doped compounds, thus enhancing the electrical transport performance. In terms of results, the PF increases from 1.3 × 102 to 2.18 × 102 µW m−1 K−2 at 673 K. Point defects and the second phase enhance phonon scattering and lead to a lower lattice thermal conductivity for CuSb1-xMnxSe2 compounds, the κl decreases from 0.39 to 0.26 W m−1 K−1 at 673 K. As a consequence, a maximum figure of merit ZT of ∼0.53 was achieved at 673 K for CuSb0.97Mn0.03Se2, which is 140 % higher than the intrinsic CuSbSe2.

Investigation of manganese doped BaSe for energy harvesting and spintronics devices

Abstract The incorporation of magnetism to a solid material may drastically alter its electrical transport behavior, providing a way to modify the magneto-optoelectronic and thermoelectric features that have recently drawn a lot of scientific attention. In this regard, we utilized density function theory (DFT) based full potential linearized augmented plane wave (FP-LAPW) approach to study doping effect of Mn on physical characteristics of barium selenide (BaSe). Pristine BaSe is nonmagnetic semiconductor with indirect bandgap of 2.11 eV. Concentration dependent Mn doping in BaSe introduces spin polarized intermediate bands in the vicinity of Fermi level primarily composed of Mn-3d orbitals. Asymmetric band profiles indicate the ferromagnetic semiconductor nature of of Mn doped BaSe compounds. Total magnetic moment value of 5.0 μ B, 10.0 μ B, and 20.0 μ B are obtained for corresponding Ba1−xMnxSe (x = 6.25%, 12.5%, 25%) systems. Furthermore, the analysis of optical and thermoelectric characteristics reveals the importance of studied alloy for application in advanced technologies including low energy light absorbers and thermoelectric generators.

Electrochemical performance of hybrid supercapacitor device based on Mn-doped LiFePO4/C and imidazolium ionic liquid electrolyte

The electrochemical performance of lithium-ion hybrid supercapacitors (Li-HSCs) build with nanostructured LiMnxFe1-xPO4/C in an ionic liquid electrolyte system was analyzed to determine the effects of Mn doping on olivine structure. The construction of hybrid cells using ionic liquids is strategic due to their low vapor pressure, which inhibits the evolution of gas and leakage in the cell, and non-flammability. The Li-HSCs cells were assembled using as electrolyte an ionic liquid system consisting of lithium bis(trifluorosulfonyl)imide (LiTFSI) and 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonamide) (EMITFSI) at a concentration of 1 mol L−1; a carbon with mesopore structure (MESO) as capacitive electrode; and Mn-doped LiFePO4 olivines, i.e., LiMnxFe1-xPO4 (x = 0.01 ≤ x ≤ 0.10), as positive electrodes. The olivines were synthesized using a solvothermal method, resulting in pure nanostructured materials. Subsequently, a thin carbon layer was added from a carbon source and calcinated at 550 °C, as confirmed by XRD, FTIR, EDS, and TEM. The electrochemical characterization of LiMnxFe1-xPO4 active materials was performed using a standard lithium cell (3-electrode cell). The LiMn0.05Fe0.95PO4 presented the best properties. The electrochemical performance of Li-HSCs constructed using all LiMnxFe1-xPO4 (x = 0.01 ≤ x ≤ 0.10) based cathodes was then evaluated. The Li-HSC built with LiMn0.05Fe0.95PO4 showed the highest capacitance, power, and energy densities among all the evaluated cells, as also verified by the electrochemical characterization of the standard lithium cells. This cell was able to deliver an energy density of 43.1 W h kg−1 at 25.9 W kg−1 (power density), which was higher than the device constructed with the un-doped olivine, LiFePO4, which delivers 35.9 W h kg−1 at 23.2 W kg−1, as well as higher than other LiMnxFe1-xPO4 based cells. Additionally, the Li-HSC constructed with LiMn0.05Fe0.95PO4 showed 67 % of energy retention after 1000 cycles, a superior performance compared to Li-HSC prepared with the un-doped olivine, which retained 54 % of its initial energy after the same cycling process.