Scholarlink

<p>Titanium dioxide (TiO<sub>2</sub>) exhibits promising pseudocapacitive behavior, but its practical application as a supercapacitor is hindered by inherently low electrical conductivity. To address this limitation, an effective surface engineering strategy was implemented in this work to improve charge transport and enhance the overall pseudocapacitance of nickel-doped TiO₂ nanocrystals with different Ni concentrations, Ni-0.3, 0.5, and 0.7, to optimize their performance in energy storage and antibacterial effectiveness. XRD structural investigation verified the presence of both anatase and rutile TiO₂ phases, with successful Ni²⁺ incorporation into the Ti⁴⁺ lattice, which revealed peak shifts, increased percentage of rutile phase with increasing Ni concentration up to optimum level Ni-0.5, and nonlinear decreasing trends in crystallite size. The porous morphology with agglomerated granular clusters with relatively dense packing is confirmed from SEM analysis. The successful incorporation of Ni in TiO<sub>2,</sub> along with the elemental composition justified by the EDX analysis. FTIR spectroscopy indicated Ti-O bonds, whereas UV–vis analysis exhibited redshift in absorption edges and reduced band gaps from 3.24 for pristine to 2.73&#xa0;eV for Ni-0.5 modified TiO<sub>2</sub> porous structures. Cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) assessments revealed a notable enhancement in specific capacitance, 336.84&#xa0;F g⁻¹, and energy density 6.75&#xa0;W h kg⁻¹ for the Ni-0.5 sample, attributed to optimal Ni doping that improved charge transport and redox activity. Furthermore, antibacterial assays against mixed colonies of E. coli and S. aureus demonstrated escalating inhibitory zones with increasing Ni concentration, which is ascribed to enhanced ROS formation and surface contact. Ni-modified TiO₂ nanocrystals exhibited significant dual functionality in energy storage and antibacterial applications, underscoring their potential for advanced multifunctional uses.</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

Synthesis and characterization of multifunctional Ni-modified TiO2 nanocrystals for supercapacitor and antibacterial applications

  • 期刊论文

  • 发表日期：

    2026年5月13日

查看全文
  • Muhammad Irfan,
  • Azhar Ali Haidry,
  • Samiah H. Al-Mijalli,
  • Osama A. Mohammed

摘要

Titanium dioxide (TiO2) exhibits promising pseudocapacitive behavior, but its practical application as a supercapacitor is hindered by inherently low electrical conductivity. To address this limitation, an effective surface engineering strategy was implemented in this work to improve charge transport and enhance the overall pseudocapacitance of nickel-doped TiO₂ nanocrystals with different Ni concentrations, Ni-0.3, 0.5, and 0.7, to optimize their performance in energy storage and antibacterial effectiveness. XRD structural investigation verified the presence of both anatase and rutile TiO₂ phases, with successful Ni²⁺ incorporation into the Ti⁴⁺ lattice, which revealed peak shifts, increased percentage of rutile phase with increasing Ni concentration up to optimum level Ni-0.5, and nonlinear decreasing trends in crystallite size. The porous morphology with agglomerated granular clusters with relatively dense packing is confirmed from SEM analysis. The successful incorporation of Ni in TiO2, along with the elemental composition justified by the EDX analysis. FTIR spectroscopy indicated Ti-O bonds, whereas UV–vis analysis exhibited redshift in absorption edges and reduced band gaps from 3.24 for pristine to 2.73 eV for Ni-0.5 modified TiO2 porous structures. Cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) assessments revealed a notable enhancement in specific capacitance, 336.84 F g⁻¹, and energy density 6.75 W h kg⁻¹ for the Ni-0.5 sample, attributed to optimal Ni doping that improved charge transport and redox activity. Furthermore, antibacterial assays against mixed colonies of E. coli and S. aureus demonstrated escalating inhibitory zones with increasing Ni concentration, which is ascribed to enhanced ROS formation and surface contact. Ni-modified TiO₂ nanocrystals exhibited significant dual functionality in energy storage and antibacterial applications, underscoring their potential for advanced multifunctional uses.