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<p>The elementary and critical process in dielectric capacitors is interfacial charge separation. In this work, we propose the synthesis and investigation of the optical, electrical and dielectric properties of a WO<sub>3</sub>·H<sub>2</sub>O/W<sub>18</sub>O<sub>49</sub> heterojunction with optimized oxygen vacancies for efficient charge storage applications. Tungsten-oxide-based heterojunctions were synthesized via a co-precipitation method using varying HCl concentrations. XRD analysis confirmed the formation of distinct phases, while XPS and Raman spectra revealed effective charge transfer and structural defects. UV-DRS studies highlighted the formation of oxygen-deficient m-W<sub>18</sub>O<sub>49</sub>. Enhanced dielectric constant, low impedance and increased conductivity were observed, particularly with low HCl concentrations, due to improved interfacial charge separation in WO<sub>3</sub>·H<sub>2</sub>O/W<sub>18</sub>O<sub>49</sub> heterojunction. These properties make the WO<sub>3</sub>·H<sub>2</sub>O/W<sub>18</sub>O<sub>49</sub>&#xa0;heterojunction a promising candidate for energy storage applications, offering significant advantages such as improved cyclic stability, power density and reduced heat generation.</p> Graphical abstract <p></p>

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Impact of interfacial charge separation on the superior dielectric properties of novel WO3·H2O/W18O49 heterojunction

  • 期刊论文

  • 发表日期：

    2025年9月12日

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  • Surbhi Sharma,
  • Jaspreet Kaur,
  • Rajesh Kumar

摘要

The elementary and critical process in dielectric capacitors is interfacial charge separation. In this work, we propose the synthesis and investigation of the optical, electrical and dielectric properties of a WO3·H2O/W18O49 heterojunction with optimized oxygen vacancies for efficient charge storage applications. Tungsten-oxide-based heterojunctions were synthesized via a co-precipitation method using varying HCl concentrations. XRD analysis confirmed the formation of distinct phases, while XPS and Raman spectra revealed effective charge transfer and structural defects. UV-DRS studies highlighted the formation of oxygen-deficient m-W18O49. Enhanced dielectric constant, low impedance and increased conductivity were observed, particularly with low HCl concentrations, due to improved interfacial charge separation in WO3·H2O/W18O49 heterojunction. These properties make the WO3·H2O/W18O49 heterojunction a promising candidate for energy storage applications, offering significant advantages such as improved cyclic stability, power density and reduced heat generation.

Graphical abstract