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![Research paper thumbnail of Na3+x[CrxTi2-x(PO4)3] glass-ceramic electrolyte: ionic conductivity and structural correlations for different heat treating temperatures and time schedules](https://attachments.academia-assets.com/93953393/thumbnails/1.jpg)
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Ionics, 2021
This investigation highlights the influence of nanosized amorphous intermediate domains such as N... more This investigation highlights the influence of nanosized amorphous intermediate domains such as Na3Bi and Na2Ti on the electrochemical characteristics of the new Na2O-Bi2O3 glass anode network mixed with TiO2 nanocrystals. Amorphous domains (h-Na3Bi and h-Na2Ti) are indexed with hexagonal structures precipitated during the charging and discharging process, which might improve the high electrochemical performance of the glass anode network to a greater extent. The first discharge and charge capacities are recorded as 700 and 1060 mAh/g, respectively. Moreover, the Coulombic efficiency achieved is between 66 and 98% as the current rate varies from 0.1 C to 5 C. The value of Rct in the EIS spectra gradually decreases up to 500 cycles, indicating an increase in the electronic conductivity, eventually boosting the ionic conductivity. These results will create a potential interest to design and develop various glass and glass–ceramic anode networks to realize Na-ion technology for large-scale energy storage applications.
THE SECOND MATERIALS RESEARCH SOCIETY OF THAILAND INTERNATIONAL CONFERENCE, 2020
Applied Nanoscience, 2018
Journal of the Iranian Chemical Society, 2020
In this report, efforts were made to investigate and characterize a variety of compositions in a ... more In this report, efforts were made to investigate and characterize a variety of compositions in a glass system of general formula Na3+xCrxTi2−x(PO4)3 (x = 0, 0.25, 0.5 and 0.75 mol%, designated as NCTPx) to optimize their properties for use in Na-ion batteries. Several crystalline phases such as Na3Ti2(PO4)3 (COD-4106515) (NASICON), Cr2O3 (ICSD-25781) and Cr(PO3)3 (ICSD-39410) are precipitated during the process of crystallization. The microstructures of all the glass and glass–ceramic samples are analyzed using SEM and are correlated with powder XRD to explain the ionic conductivity for a given glass–ceramic sample. Single semicircle in the complex impedance plots clearly suggests that the present NCTPx glass samples exhibit a predominantly single-ion conduction mechanism. Electrical conductivity data follow the Arrhenius equation. The power-law exponent ‘s’ is observed to be the lowest (0.70) for the best conducting glass–ceramic sample NTCP0.5 (4.24 × 10−4 S/cm). The electrical modulus study proves that the conductivity relaxation of NCTPx glass–ceramic samples is temperature independent. Scaling behavior in the normalized spectra indicates that frequency-dependent relaxation behavior is unaffected by the temperature.
Journal of Alloys and Compounds, 2004
Electrochimica Acta
Abstract In this manuscript, the effect of adding graphitic carbon nitride (g-C3N4) on the electr... more Abstract In this manuscript, the effect of adding graphitic carbon nitride (g-C3N4) on the electrochemical properties of ZnS conversion alloying anode has been investigated in detail. A cooperative phenomenon is observed in case of the ZnS/g-C3N4 composite anodes both in the lithium-ion and sodium-ion half-cell configuration. The ZnS nanoparticles render high capacity and gets lodged in the g-C3N4 nanosheets synthesized using acid assisted sonication method and leads to a synergistic effect which prevents restacking of layers and agglomeration of nanoparticles. The 0.7ZnS:0.3g-C3N4 composite delivers long term reversible capacity of ~596.9 mAh g−1 after 1150 cycles and ~432.6 mAh g−1 after 750 cycles in Li+/Na+ half-cell configuration, respectively, at a high current density of 1 A g−1. The structural and electrochemical investigation of the bare ZnS and ZnS/g-C3N4 composite anodes along-with post-mortem SEM and TEM analysis has been discussed. The enhanced rate capability of the 0.7ZnS:0.3g-C3N4 electrode can be attributed to a fairly prominent role played by capacitive charge storage. The deleterious volume alteration effect during the shuttling of Li+/Na+ ions in ZnS is mitigated by the presence of g-C3N4 and it renders a high reversible capacity and initial coulombic efficiency to the composite anodes which has been studied via ex-situ X-ray photoelectron spectroscopy.
European Physical …, 2004
ESR, IR, optical absorption and photoluminescence spectra of Ho 3+ doped tungsten phosphate glass... more ESR, IR, optical absorption and photoluminescence spectra of Ho 3+ doped tungsten phosphate glasses modified with three different modifier oxides viz., PbO, ZnO and CaO have been studied. The ESR spectral studies indicate tungsten ions are present in W 5+ state in all ...
Indian journal of pure & applied …, 2005
Li2O-MgO-B2O3:TiO2 glasses were crystallized at three different temperatures. The samples were ch... more Li2O-MgO-B2O3:TiO2 glasses were crystallized at three different temperatures. The samples were characterized by scanning electron microscopy and differential scanning calorimetry. Various physical properties viz., optical (optical absorption, IR spectra and thermoluminescence), ...
Materials chemistry and …, 2004
Alkali/alkaline-earth oxy borate glasses are well known due to their variety of applications in p... more Alkali/alkaline-earth oxy borate glasses are well known due to their variety of applications in phosphors, solar energy converters and in a number of electronic devices. These glasses are relatively moisture-resistant, possess high mechanical strength when compared with the ...
Solid state …, 2004
PbOB 2 O 3 glasses containing different concentrations of MoO 3 ranging from 0 to 4 mol% were pr... more PbOB 2 O 3 glasses containing different concentrations of MoO 3 ranging from 0 to 4 mol% were prepared. The dielectric properties (constant ′, loss tan δ, ac conductivity σ ac over a range of frequency and temperature and breakdown strength) of these glasses have been ...
Journal of alloys and compounds, 2004
Li 2 OMgOB 2 O 3 glasses containing different concentrations of V 2 O 5 ranging from 0 to 1.5 m... more Li 2 OMgOB 2 O 3 glasses containing different concentrations of V 2 O 5 ranging from 0 to 1.5 mol% are prepared. Dielectric properties, viz., constant ′, loss tan δ, ac conductivity σ ac over a range of frequency and temperature and breakdown strength in air medium have ...
Ionics, 2021
This investigation highlights the influence of nanosized amorphous intermediate domains such as N... more This investigation highlights the influence of nanosized amorphous intermediate domains such as Na3Bi and Na2Ti on the electrochemical characteristics of the new Na2O-Bi2O3 glass anode network mixed with TiO2 nanocrystals. Amorphous domains (h-Na3Bi and h-Na2Ti) are indexed with hexagonal structures precipitated during the charging and discharging process, which might improve the high electrochemical performance of the glass anode network to a greater extent. The first discharge and charge capacities are recorded as 700 and 1060 mAh/g, respectively. Moreover, the Coulombic efficiency achieved is between 66 and 98% as the current rate varies from 0.1 C to 5 C. The value of Rct in the EIS spectra gradually decreases up to 500 cycles, indicating an increase in the electronic conductivity, eventually boosting the ionic conductivity. These results will create a potential interest to design and develop various glass and glass–ceramic anode networks to realize Na-ion technology for large-scale energy storage applications.
THE SECOND MATERIALS RESEARCH SOCIETY OF THAILAND INTERNATIONAL CONFERENCE, 2020
Applied Nanoscience, 2018
Journal of the Iranian Chemical Society, 2020
In this report, efforts were made to investigate and characterize a variety of compositions in a ... more In this report, efforts were made to investigate and characterize a variety of compositions in a glass system of general formula Na3+xCrxTi2−x(PO4)3 (x = 0, 0.25, 0.5 and 0.75 mol%, designated as NCTPx) to optimize their properties for use in Na-ion batteries. Several crystalline phases such as Na3Ti2(PO4)3 (COD-4106515) (NASICON), Cr2O3 (ICSD-25781) and Cr(PO3)3 (ICSD-39410) are precipitated during the process of crystallization. The microstructures of all the glass and glass–ceramic samples are analyzed using SEM and are correlated with powder XRD to explain the ionic conductivity for a given glass–ceramic sample. Single semicircle in the complex impedance plots clearly suggests that the present NCTPx glass samples exhibit a predominantly single-ion conduction mechanism. Electrical conductivity data follow the Arrhenius equation. The power-law exponent ‘s’ is observed to be the lowest (0.70) for the best conducting glass–ceramic sample NTCP0.5 (4.24 × 10−4 S/cm). The electrical modulus study proves that the conductivity relaxation of NCTPx glass–ceramic samples is temperature independent. Scaling behavior in the normalized spectra indicates that frequency-dependent relaxation behavior is unaffected by the temperature.
Journal of Alloys and Compounds, 2004
Electrochimica Acta
Abstract In this manuscript, the effect of adding graphitic carbon nitride (g-C3N4) on the electr... more Abstract In this manuscript, the effect of adding graphitic carbon nitride (g-C3N4) on the electrochemical properties of ZnS conversion alloying anode has been investigated in detail. A cooperative phenomenon is observed in case of the ZnS/g-C3N4 composite anodes both in the lithium-ion and sodium-ion half-cell configuration. The ZnS nanoparticles render high capacity and gets lodged in the g-C3N4 nanosheets synthesized using acid assisted sonication method and leads to a synergistic effect which prevents restacking of layers and agglomeration of nanoparticles. The 0.7ZnS:0.3g-C3N4 composite delivers long term reversible capacity of ~596.9 mAh g−1 after 1150 cycles and ~432.6 mAh g−1 after 750 cycles in Li+/Na+ half-cell configuration, respectively, at a high current density of 1 A g−1. The structural and electrochemical investigation of the bare ZnS and ZnS/g-C3N4 composite anodes along-with post-mortem SEM and TEM analysis has been discussed. The enhanced rate capability of the 0.7ZnS:0.3g-C3N4 electrode can be attributed to a fairly prominent role played by capacitive charge storage. The deleterious volume alteration effect during the shuttling of Li+/Na+ ions in ZnS is mitigated by the presence of g-C3N4 and it renders a high reversible capacity and initial coulombic efficiency to the composite anodes which has been studied via ex-situ X-ray photoelectron spectroscopy.
European Physical …, 2004
ESR, IR, optical absorption and photoluminescence spectra of Ho 3+ doped tungsten phosphate glass... more ESR, IR, optical absorption and photoluminescence spectra of Ho 3+ doped tungsten phosphate glasses modified with three different modifier oxides viz., PbO, ZnO and CaO have been studied. The ESR spectral studies indicate tungsten ions are present in W 5+ state in all ...
Indian journal of pure & applied …, 2005
Li2O-MgO-B2O3:TiO2 glasses were crystallized at three different temperatures. The samples were ch... more Li2O-MgO-B2O3:TiO2 glasses were crystallized at three different temperatures. The samples were characterized by scanning electron microscopy and differential scanning calorimetry. Various physical properties viz., optical (optical absorption, IR spectra and thermoluminescence), ...
Materials chemistry and …, 2004
Alkali/alkaline-earth oxy borate glasses are well known due to their variety of applications in p... more Alkali/alkaline-earth oxy borate glasses are well known due to their variety of applications in phosphors, solar energy converters and in a number of electronic devices. These glasses are relatively moisture-resistant, possess high mechanical strength when compared with the ...
Solid state …, 2004
PbOB 2 O 3 glasses containing different concentrations of MoO 3 ranging from 0 to 4 mol% were pr... more PbOB 2 O 3 glasses containing different concentrations of MoO 3 ranging from 0 to 4 mol% were prepared. The dielectric properties (constant ′, loss tan δ, ac conductivity σ ac over a range of frequency and temperature and breakdown strength) of these glasses have been ...
Journal of alloys and compounds, 2004
Li 2 OMgOB 2 O 3 glasses containing different concentrations of V 2 O 5 ranging from 0 to 1.5 m... more Li 2 OMgOB 2 O 3 glasses containing different concentrations of V 2 O 5 ranging from 0 to 1.5 mol% are prepared. Dielectric properties, viz., constant ′, loss tan δ, ac conductivity σ ac over a range of frequency and temperature and breakdown strength in air medium have ...