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Nanoengineered reduced graphene oxide-Fe doped α-MnO2: A multifunctional smart material for energy storage and environmental remediation

2024; Elsevier BV; Volume: 86; Linguagem: Inglês

10.1016/j.est.2024.111206

2352-1538

N. D. Raskar, D. V. Dake, V. A. Mane, R.B. Sonpir, H. A. Khawal, V. D. Mote, М. Vasundhara, Asokan Kandasami, Ketan P. Gattu, B. N. Dole,

Nanomaterials for catalytic reactions

Nanocomposites based on α-MnO2, reduced graphene oxide (rGO)-based α-MnO2, and Fe-doped α-MnO2 were successfully synthesized via the hydrothermal method. These materials were investigated for their potential applications in supercapacitors and photocatalytic dye degradation. This investigation involves a phase transition from α-MnO2 to the cubic phase of α-Mn2O3, as revealed by X-ray diffraction (XRD) analysis. The electrochemical performance and photocatalytic activity were significantly enhanced through the incorporation of rGO and Fe doping into the α-MnO2 lattice. Notably, the rGO-based 5 % Fe-doped MnO2 (referred to as GFMO5) sample exhibits a high specific capacitance of 683.35 F/g−1, attributed to its mixed phase and defective morphology. Moreover, the introduction of Fe into the MnO2 structure led to a phase transition, as confirmed by XRD, FE-SEM, and XPS results. This phase transition resulted in the remarkable degradation of methylene blue (MB) dye, achieving up to 90 % degradation under visible light irradiation. This research underscores the potential of these nanocomposite materials for advanced energy storage and environmental remediation applications.