Scholarlink

<p>A two-dimensional (2D) vanadium oxide (VO<sub>x</sub>) nanosheet was synthesized via a straightforward hydrothermal method, and its potential application for supercapacitors was explored. The as-synthesized VO<sub>x</sub> nanosheets were characterized through X-ray diffraction (XRD), Raman spectroscopy, high-resolution scanning electron microscopy (HR-SEM), and high-resolution transmission electron microscopy (HR-TEM) analysis. Cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) techniques were used to explore the electrochemical performances of the supercapacitor. A specific capacitance of 278 F/g was achieved at a current density of 1 A/g. Besides, excellent Coulombic efficiency (93%) and capacitance retention (83%, after 5000 cycles) were obtained at the current density of 5 A/g. Moreover, an asymmetric supercapacitor (ASC) was also constructed, which shows 5 Wh/kg and 7500 W/kg energy and power densities at 10 A/g, respectively. A remarkable coulombic efficiency (90%) and capacity retention (98%) were observed even after 12,000 GCD cycles, which indicates excellent cyclic stability of the VO<sub>x</sub>-based 2D materials for energy storage applications. Thus, the synthesized VO<sub>x</sub>-based electrodes exhibited high specific capacitance at higher current densities with adequate stability (achieving higher coulombic efficiency and capacity retention) compared to the existing VO<sub>x</sub>-based and other electrodes.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Enhanced energy storage performance of two-dimensional vanadium oxide nanosheets for supercapacitors

  • 期刊论文

  • 发表日期：

    2025年4月12日

查看全文
  • Sankaranarayanan Karthikeyan,
  • E. S. Sowbakkiyavathi,
  • M. Sindhuja,
  • Anandhakumar Sukeri

摘要

A two-dimensional (2D) vanadium oxide (VOx) nanosheet was synthesized via a straightforward hydrothermal method, and its potential application for supercapacitors was explored. The as-synthesized VOx nanosheets were characterized through X-ray diffraction (XRD), Raman spectroscopy, high-resolution scanning electron microscopy (HR-SEM), and high-resolution transmission electron microscopy (HR-TEM) analysis. Cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) techniques were used to explore the electrochemical performances of the supercapacitor. A specific capacitance of 278 F/g was achieved at a current density of 1 A/g. Besides, excellent Coulombic efficiency (93%) and capacitance retention (83%, after 5000 cycles) were obtained at the current density of 5 A/g. Moreover, an asymmetric supercapacitor (ASC) was also constructed, which shows 5 Wh/kg and 7500 W/kg energy and power densities at 10 A/g, respectively. A remarkable coulombic efficiency (90%) and capacity retention (98%) were observed even after 12,000 GCD cycles, which indicates excellent cyclic stability of the VOx-based 2D materials for energy storage applications. Thus, the synthesized VOx-based electrodes exhibited high specific capacitance at higher current densities with adequate stability (achieving higher coulombic efficiency and capacity retention) compared to the existing VOx-based and other electrodes.