Structural, Optical and Electrochemical Study of La0.8Sr0.2CuO3-δ for Supercapacitor Applications

Editorial Board PCSS Journal; Yaseen Khan; Iqra Naz; Asma Kamal; Javid Ullah; Izaz Khan; Raz Muhammad

doi:10.15330/pcss.27.3.598-605

Authors

Yaseen Khan Laboratory of Functional Materials and Devices, Department of Physics, Abdul Wali Khan University Mardan, KP, Pakistan
Iqra Naz Laboratory of Functional Materials and Devices, Department of Physics, Abdul Wali Khan University Mardan, KP, Pakistan
Asma Kamal Laboratory of Functional Materials and Devices, Department of Physics, Abdul Wali Khan University Mardan, KP, Pakistan
Javid Ullah Laboratory of Functional Materials and Devices, Department of Physics, Abdul Wali Khan University Mardan, KP, Pakistan
Izaz Khan Institute of Solid State Physics, Technische Universität Wien, Vienna, Austria
Raz Muhammad Laboratory of Functional Materials and Devices, Department of Physics, Abdul Wali Khan University Mardan, KP, Pakistan

DOI:

https://doi.org/10.15330/pcss.27.3.598-605

Keywords:

LaCuO3, Electrochemical Properties, Optical Properties, Supercapacitors

Abstract

La_0.8Sr_0.2CuO_3-_δ was prepared through solid state sintering route and its electrochemical performance was evaluated. A single-phase orthorhombic structure was formed when calcined at 950 °C for 6 h. The average crystallite size calculated using Williamson-Hall plot was found to be 43.3 nm while SEM reveals agglomerated, rectangular-like particles with an average particle size of ~0.4 µm. The optical band gap (E_g) of the sample was calculated through the diffuse reflectance spectrum. The direct (1.74 eV) and indirect (1.70 eV) optical band gaps were calculated from the Tauc plot. The sample showed a high absorption in the visible light region. The highest specific capacitance at a scan rate of 5 mV/s was 76.79 (F/g). Kinetic analysis indicates dominant capacitive-controlled charge storage (≈ 71% at 10 mV s^-1, rising to ≈ 88% at 100 mV s^-1). Linear sweep voltammetry further indicates oxygen evolution activity with an onset potential of 1.636 V and a Tafel slope of 221 mV dec^-1, with overpotentials of ~444 mV, 460 mV and ~470 mV at 40, 50 and 60 mA cm^-2, respectively.

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