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<p>This study focuses on developing efficient, ecologically friendly, and cost-effective electrocatalysts for energy applications. Carbon nanofiber (CNF)-supported Bi<sub>25</sub>FeO<sub>40</sub> (S-BFO) composites are synthesised, and their suitability as electrocatalysts for supercapacitors and counter electrodes (CEs) in dye-sensitised solar cells (DSSCs) is investigated. Different methodologies are utilised to assess sample quality, phase, crystalline structure, morphology, and elemental composition. Electrochemical tests revealed that the S-BFO/30 mg CNF composite exhibited an exceptional specific capacitance of 1182 F g<sup>−1</sup>, even at an elevated current density of 4 A g<sup>−1</sup>, indicating a 55% improvement over pristine S-BFO. The S-BFO-CNF//activated carbon (AC) asymmetric supercapacitor (ASC) achieved an impressive energy density of 27.2 Wh kg<sup>−1</sup> at a power density of 1800 W kg<sup>−1</sup>. This ASC&#xa0;maintained outstanding cycle reliability (85% @ 5000 cycles at 15 A g<sup>−1</sup>). The synthesised samples are also employed as CE in DSSCs. The S-BFO/30 mg CNF CE achieved a higher power conversion efficiency, PCE (<i>η</i>) of 3.05%, with a maximum short-circuit current density (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({J}_{\text{s}\text{c}})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>J</mi> <mtext>sc</mtext> </msub> <mrow> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> of 7.2 mA cm<sup>−2</sup> and open-circuit voltage (<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({V}_{oc})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>V</mi> <mrow> <mi mathvariant="italic">oc</mi> </mrow> </msub> <mrow> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> of 0.77 V. In a comprehensive analysis, they assessed redox kinetics, rate capability, conductivity, catalytic activity, diffusion capacitance, and charge-transfer kinetics at the electrode/electrolyte interface. This research underscores the potential of CNF-supported S-BFO as an efficient and promising electrocatalyst for future energy storage and conversion devices.</p>

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Synergistic effect of Bi25FeO40/carbon nanofiber composite on electrocatalytic performance of supercapacitors and dye-sensitised solar cells

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • A. Muthu Kumar,
  • B. Janarthanan,
  • K. Jayakumar

摘要

This study focuses on developing efficient, ecologically friendly, and cost-effective electrocatalysts for energy applications. Carbon nanofiber (CNF)-supported Bi25FeO40 (S-BFO) composites are synthesised, and their suitability as electrocatalysts for supercapacitors and counter electrodes (CEs) in dye-sensitised solar cells (DSSCs) is investigated. Different methodologies are utilised to assess sample quality, phase, crystalline structure, morphology, and elemental composition. Electrochemical tests revealed that the S-BFO/30 mg CNF composite exhibited an exceptional specific capacitance of 1182 F g−1, even at an elevated current density of 4 A g−1, indicating a 55% improvement over pristine S-BFO. The S-BFO-CNF//activated carbon (AC) asymmetric supercapacitor (ASC) achieved an impressive energy density of 27.2 Wh kg−1 at a power density of 1800 W kg−1. This ASC maintained outstanding cycle reliability (85% @ 5000 cycles at 15 A g−1). The synthesised samples are also employed as CE in DSSCs. The S-BFO/30 mg CNF CE achieved a higher power conversion efficiency, PCE (η) of 3.05%, with a maximum short-circuit current density ( \({J}_{\text{s}\text{c}})\) J sc ) of 7.2 mA cm−2 and open-circuit voltage ( \({V}_{oc})\) V oc ) of 0.77 V. In a comprehensive analysis, they assessed redox kinetics, rate capability, conductivity, catalytic activity, diffusion capacitance, and charge-transfer kinetics at the electrode/electrolyte interface. This research underscores the potential of CNF-supported S-BFO as an efficient and promising electrocatalyst for future energy storage and conversion devices.