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<p>We have strategically converted α-Fe<sub>2</sub>O<sub>3</sub> into an amorphous iron oxide/iron/boron composite (Fe-O/B) amicable for use as a supercapacitor electrode material. The conversion of α-Fe<sub>2</sub>O<sub>3</sub> involves two combustion processes: (i) foamy combustion resulting in a reduction of α-Fe<sub>2</sub>O<sub>3</sub> to nano zero-valent iron (nZVI) and (ii) smoldering combustion from the oxidation of nZVI to Fe-O/B composite. The obtained composite was characterized by powder XRD, FT-IR, SEM, HRTEM, BET, and XPS, confirming the amorphous nature and presence of boron in the composite. Vibrating sample magnetometry studies showed <i>M</i><sub>s</sub> and <i>M</i><sub>r</sub> were 38.59&#xa0;emu/g and 15.75&#xa0;emu/g, respectively. Electrochemical studies of α-Fe<sub>2</sub>O<sub>3</sub>, nZVI, and Fe-O/B composite in three-electrode configurations in 1&#xa0;M KOH electrolyte solution were performed wherein Fe-O/B exhibited a high specific capacitance of 1900 F/g at 1 A/g, with a capacitance retention of 74.2% over 4000 cycles between −0.45 and 0.2&#xa0;V. The high electrochemical performance can be attributed to the amorphous nature and the role of iron and boron in redox reactions. Hence, Fe-O/B composite can be a promising electrode material for various electrochemical applications.</p>

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Enhanced electrochemical performance of amorphous iron oxide/boron composite derived from α-Fe2O3 for supercapacitor applications

  • 期刊论文

  • 发表日期：

    2025年9月24日

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  • R. Sudarshana,
  • Adithya Rajiv,
  • Ramdas Balan,
  • K. Jagannathan,
  • F. Regan Maria Sundar Raj,
  • R. Sambasivam,
  • M. Prakash

摘要

We have strategically converted α-Fe2O3 into an amorphous iron oxide/iron/boron composite (Fe-O/B) amicable for use as a supercapacitor electrode material. The conversion of α-Fe2O3 involves two combustion processes: (i) foamy combustion resulting in a reduction of α-Fe2O3 to nano zero-valent iron (nZVI) and (ii) smoldering combustion from the oxidation of nZVI to Fe-O/B composite. The obtained composite was characterized by powder XRD, FT-IR, SEM, HRTEM, BET, and XPS, confirming the amorphous nature and presence of boron in the composite. Vibrating sample magnetometry studies showed Ms and Mr were 38.59 emu/g and 15.75 emu/g, respectively. Electrochemical studies of α-Fe2O3, nZVI, and Fe-O/B composite in three-electrode configurations in 1 M KOH electrolyte solution were performed wherein Fe-O/B exhibited a high specific capacitance of 1900 F/g at 1 A/g, with a capacitance retention of 74.2% over 4000 cycles between −0.45 and 0.2 V. The high electrochemical performance can be attributed to the amorphous nature and the role of iron and boron in redox reactions. Hence, Fe-O/B composite can be a promising electrode material for various electrochemical applications.