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<p>The blooming of affordable negative electrodes for supercapacitors and improving their efficiency has recently gained attention in the energy storage. In this regard, transition metal phosphates show great promise as supercapacitor electrode materials. Here, the cobalt iron phosphate and its carbon composite were synthesized using microwave irradiation method. The prepared compounds were subjected to analyse its structural and morphological characteristics via powder X-ray diffraction spectroscopy (XRD), X-ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM), Brunauer − Emmett − Teller (BET). XRD analysis revealed that the incorporation of carbon nanofibers disrupts the crystallization of cobalt iron phosphate, resulting in nanocomposites that predominantly exhibit an amorphous structure. The chemical state and environment of the elements present in the 2.5 wt% of carbon nanofiber is blended composite is examined using X-ray photoelectron spectroscopy technique. The pristine cobalt iron phosphate exhibits a quasi-spherical nanostructure morphology, which is retained in the composites as well. However, the particle size is noticeably reduced upon the addition of carbon nanofibers, highlighting their effectiveness in minimizing aggregation and controlling particle growth. Furthermore, electrochemical analysis performed using a three-electrode configuration reveals prominent redox peaks, indicating that the prepared electrode materials store energy primarily through redox reactions. A maximum specific capacity of 553&#xa0;C g<sup>− 1</sup> at a current density of 1&#xa0;mA cm<sup>− 2</sup> was achieved for the cobalt iron phosphate composite containing 2.5 wt% carbon nanofibers. Additionally, the material demonstrated excellent cycling stability, achieving a remarkable 116% capacity retention even after 2000 GCD cycles. The results underscore the synergistic effect of carbon support and microwave synthesis in enhancing the electrochemical performance of cobalt iron phosphate, making it a strong candidate for future asymmetric supercapacitor devices.</p>

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Tailored cobalt iron phosphate on carbon support via microwave technique for supercapacitor electrodes

  • 期刊论文

  • 发表日期：

    2025年12月4日

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  • Arumugam Shanmugapriya,
  • Joseph Johnson William,
  • Lakshmanasamy Chitra,
  • Nataraj Chithra,
  • Deivasikamani Ganeshkumar,
  • Periasamy Grisa,
  • Prabhakaran Shriyash,
  • Mathiyazhakan Lokesh Kumar

摘要

The blooming of affordable negative electrodes for supercapacitors and improving their efficiency has recently gained attention in the energy storage. In this regard, transition metal phosphates show great promise as supercapacitor electrode materials. Here, the cobalt iron phosphate and its carbon composite were synthesized using microwave irradiation method. The prepared compounds were subjected to analyse its structural and morphological characteristics via powder X-ray diffraction spectroscopy (XRD), X-ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM), Brunauer − Emmett − Teller (BET). XRD analysis revealed that the incorporation of carbon nanofibers disrupts the crystallization of cobalt iron phosphate, resulting in nanocomposites that predominantly exhibit an amorphous structure. The chemical state and environment of the elements present in the 2.5 wt% of carbon nanofiber is blended composite is examined using X-ray photoelectron spectroscopy technique. The pristine cobalt iron phosphate exhibits a quasi-spherical nanostructure morphology, which is retained in the composites as well. However, the particle size is noticeably reduced upon the addition of carbon nanofibers, highlighting their effectiveness in minimizing aggregation and controlling particle growth. Furthermore, electrochemical analysis performed using a three-electrode configuration reveals prominent redox peaks, indicating that the prepared electrode materials store energy primarily through redox reactions. A maximum specific capacity of 553 C g− 1 at a current density of 1 mA cm− 2 was achieved for the cobalt iron phosphate composite containing 2.5 wt% carbon nanofibers. Additionally, the material demonstrated excellent cycling stability, achieving a remarkable 116% capacity retention even after 2000 GCD cycles. The results underscore the synergistic effect of carbon support and microwave synthesis in enhancing the electrochemical performance of cobalt iron phosphate, making it a strong candidate for future asymmetric supercapacitor devices.