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<p>Graphitized carbon nanofibers (G-CNFs) were prepared by an electrospinning method and subsequently decorated with different wt% of iron nickel tungstate (Fe<sub>0.5</sub>Ni<sub>0.5</sub>WO<sub>4</sub>) nanoparticles (NPs) through an in-situ hydrothermal process to use as an efficient counter electrode (CEs) for dye-sensitized solar cells (DSSCs). The main objective of the work is to fabricate DSSC exhibiting long-term durability and enhanced photovoltaic performance compared to standard platinum (Pt) based DSSCs, by integrating the advantages of porous G-CNFs with the electrocatalytic active Fe<sub>0.5</sub>Ni<sub>0.5</sub>WO<sub>4</sub> nanoparticles. The structural and morphological studies by X-ray diffraction pattern (XRD), Raman spectroscopy and field-emission scanning electron microscopy (FE-SEM) confirmed the successful integration of nanoparticles. The electrocatalytic activity of iron nickel tungstate (Fe<sub>0.5</sub>Ni<sub>0.5</sub>WO<sub>4</sub>) nanoparticles decorated G-CNFs (Fe<sub>0.5</sub>Ni<sub>0.5</sub>WO<sub>4</sub>/G-CNFs) were observed from cyclic voltammetry (CV), electrochemical impedance and Tafel polarization studies. The electro-chemical stability of various concentrations of Fe<sub>0.5</sub>Ni<sub>0.5</sub>WO<sub>4</sub>/G-CNFs in iodide/tri-iodide (I<sup>−</sup>/I<sub>3</sub><sup>−</sup>) redox couple containing electrolyte was investigated by Tafel polarization and electrochemical impedance studies. It implies that 5wt% of Fe<sub>0.5</sub>Ni<sub>0.5</sub>WO<sub>4</sub>/G-CNFs has more corrosion resistant than Pt, (Fe-Ni)/G-CNFs and 10 wt% of Fe<sub>0.5</sub>Ni<sub>0.5</sub>WO<sub>4</sub>/G-CNFs. Finally, DSSC assembled with this CE delivered higher photo-conversion efficiency than the standard Platinum-based device, owing to the synergistic effect of one-dimensional G-CNF electron transport and the high electrocatalytic activity of Fe<sub>0.5</sub>Ni<sub>0.5</sub>WO<sub>4</sub>. These findings highlight a promising pathway toward long durable, low-cost CEs for next-generation DSSCs.</p>

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Synergistic performance enhancement of electrospun graphitized carbon nanofibers loaded iron nickel tungstate nanoparticles as a long durable counter electrode for dye-sensitized solar cell

  • 期刊论文

  • 发表日期：

    2026年1月21日

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  • K. Saranya,
  • Saradh R. Prasad,
  • Chao Yan,
  • Ju Hyun Oh,
  • Seung Jun Lee,
  • A. Subramania

摘要

Graphitized carbon nanofibers (G-CNFs) were prepared by an electrospinning method and subsequently decorated with different wt% of iron nickel tungstate (Fe0.5Ni0.5WO4) nanoparticles (NPs) through an in-situ hydrothermal process to use as an efficient counter electrode (CEs) for dye-sensitized solar cells (DSSCs). The main objective of the work is to fabricate DSSC exhibiting long-term durability and enhanced photovoltaic performance compared to standard platinum (Pt) based DSSCs, by integrating the advantages of porous G-CNFs with the electrocatalytic active Fe0.5Ni0.5WO4 nanoparticles. The structural and morphological studies by X-ray diffraction pattern (XRD), Raman spectroscopy and field-emission scanning electron microscopy (FE-SEM) confirmed the successful integration of nanoparticles. The electrocatalytic activity of iron nickel tungstate (Fe0.5Ni0.5WO4) nanoparticles decorated G-CNFs (Fe0.5Ni0.5WO4/G-CNFs) were observed from cyclic voltammetry (CV), electrochemical impedance and Tafel polarization studies. The electro-chemical stability of various concentrations of Fe0.5Ni0.5WO4/G-CNFs in iodide/tri-iodide (I−/I3−) redox couple containing electrolyte was investigated by Tafel polarization and electrochemical impedance studies. It implies that 5wt% of Fe0.5Ni0.5WO4/G-CNFs has more corrosion resistant than Pt, (Fe-Ni)/G-CNFs and 10 wt% of Fe0.5Ni0.5WO4/G-CNFs. Finally, DSSC assembled with this CE delivered higher photo-conversion efficiency than the standard Platinum-based device, owing to the synergistic effect of one-dimensional G-CNF electron transport and the high electrocatalytic activity of Fe0.5Ni0.5WO4. These findings highlight a promising pathway toward long durable, low-cost CEs for next-generation DSSCs.