Neodymium orthoferrite/reduced graphene oxide composite electrode material for high-performance asymmetric supercapacitors

Zahra T, Bashir S, Anwar M, Jaffri JA, Hina M, Loh KH, Prasankumar T, Ramesh S, Ramesh K (2026)

Publication Type: Journal article

Publication year: 2026

Journal

DOI: 10.1016/j.jre.2026.01.019

Abstract

The rational design of nanostructured metal oxides with integrated conductive frameworks is critical for advancing high-performance supercapacitor technologies. Herein, we report the hydrothermal synthesis of rare earth oxide neodymium orthoferrite (NdFeO3, NFO) and its composite with reduced graphene oxide (rGO) as promising pseudocapacitive electrode materials. X-ray diffraction (XRD) results assure the development of pure orthorhombic NFO and NFO/rGO, while field emission scanning electron microscopy (FESEM) analysis reveals NFO particles uniformly distributed across rGO sheets. Electrochemical evaluations using a three-electrode system demonstrate the superior performance of the NFO/rGO composite. The formulated electrodes achieve the specific capacitance (Cs) of 243 F/g (rGO), 420 F/g (NFO), and 717 F/g (NFO/rGO) at 10 mV/s by cyclic voltammetry (CV) analysis. Galvanostatic charge–discharge (GCD) analysis at 1 A/g attained 218, 659, and 825 F/g, respectively. Electrochemical impedance spectroscopy results reveal reduced solution resistance (0.28 Ω) and charge transfer resistance (1.75 Ω) for NFO/rGO, confirming enhanced electron/ion transport. An asymmetric supercapacitor device employing NFO/rGO as the positive electrode and activated carbon as the negative electrode exhibits Cs of 239 F/g at 1 A/g, delivering energy density (Ed) of 75 Wh/kg at a power density (Pd) of 1500 W/kg. The device maintains 78% of its initial capacitance after 5000 cycles at 7 A/g, indicating excellent long-term stability. These findings position the rare earth oxide composite as a scalable and efficient electrode material for next-generation asymmetric supercapacitors.

Authors with CRIS profile

Muhammad Anwar Department Chemie- und Bioingenieurwesen (CBI)

Additional Organisation(s)

Interface Research and Catalysis (ECRC)

Involved external institutions

University of Malaya (UM) / Universiti Malaya

Malaysia (MY) Bahauddin Zakariya University

Pakistan (PK)

How to cite

APA:

Zahra, T., Bashir, S., Anwar, M., Jaffri, J.A., Hina, M., Loh, K.H.,... Ramesh, K. (2026). Neodymium orthoferrite/reduced graphene oxide composite electrode material for high-performance asymmetric supercapacitors. Journal of Rare Earths. https://doi.org/10.1016/j.jre.2026.01.019

MLA:

Zahra, Tehreem, et al. "Neodymium orthoferrite/reduced graphene oxide composite electrode material for high-performance asymmetric supercapacitors." Journal of Rare Earths (2026).

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