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Dielectric and electrochemical behavior of hydrothermally synthesized Zn-doped titanate nanotubes
(2026-11-01)
Masakul, Pristanuch
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Krongkitsiri, Pacharee
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Thongbai, Prasit
;
Kidkhunthod, Pinit
;
Maensiri, Santi
A bstract Zn-doped titanate nanotubes (Zn-doped TNTs) with the composition of Zn<inf>x</inf>Ti<inf>3-x</inf>O<inf>7</inf>, (Na<inf>0.96</inf>H<inf>1.04</inf>∙3.42H<inf>2</inf>O) (where x = 0, 0.05, 0.1, and 0.2) were synthesized via a hydrothermal method at 130 °C for 24 h. Structural and morphological characterization using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), UV-Vis (Ultraviolet-Visible), X-ray Absorption Near Edge Structure (XANES), and Brunauer-Emmett-Teller (BET) techniques confirmed the formation of well-defined nanotubes with controlled dimensions. Transmission electron microscopy (TEM) images of undoped and Zn-doped titanate nanotubes reveal uniform hollow nanotubular structures with diameters of ∼7–15 nm and multilayered walls. The dielectric properties of the Zn-doped TNTs were examined using an LCR meter across a frequency range of 102–106 Hz. The results revealed a remarkably high dielectric constant (ε′) (∼104-105 at 30 °C and 1 kHz), which was attributed to Debye-like relaxation governed by Maxwell-Wagner polarization. The dielectric response exhibited a strong dependence on Zn doping levels, with higher Zn content leading to enhanced permittivity. Electrochemical properties were evaluated through cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS). The Zn-doped TNTs demonstrated a specific capacitance ( C ) of 23 F g−1 at a scan rate of 1 mV s−1, indicating their potential for energy storage applications. This systematic investigation of Zn incorporation provides critical insights into its impact on the structural, dielectric, and electrochemical properties of titanate nanotubes (TNTs). These findings provide useful insight for further optimization of doped titanate nanostructures toward advanced multifunctional dielectric and electrochemical energy-storage applications.
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Glass-sulfur composite cathodes: A new strategy for improving the performance of lithium-sulfur batteries
(2024-10-01)
Siriroj, Sumeth
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Padchasri, Jintara
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Montreeuppathum, Amorntep
;
Sonsupap, Somchai
;
Maensiri, Santi
In this study, we investigated the potential of glass-sulfur composites to improve lithium–sulfur battery (LSB) performance. Glass-sulfur composites were prepared by the precipitation method, and the effect of varying carbon black content was studied. The results showed that glass addition improved the battery performance due to the high ion-conductivity of its structural motif. The 75 % glass variant demonstrated the best results, in both the low carbon and high carbon cases. The cyclic voltammetry (CV) and electrical impedance spectroscopy (EIS) measurements showed that glass-sulfur composites had lower resistivity than pure sulfur, which was beneficial for battery performance. The XANES analysis revealed that the incorporated glass interacted with and modified the properties of sulfur, leading to a higher proportion of sulfur in the -1 oxidation state (S−1). This suggests that the high proportion of S−1 phase benefitted battery capacity. Overall, glass-sulfur composites prepared using the precipitation method and incorporating a high content of carbon show promise as a novel and improved cathode material for LSBs.

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