Nanofiber NiMoO4/g-C3N4 Composite Electrode Materials for Redox Supercapacitor Applications

Kannadasan Thiagarajan; Thirugnanam Bavani; Prabhakarn Arunachalam; Seung Jun Lee; Jayaraman Theerthagiri; Jaganathan Madhavan; Bruno Georges Pollet; Myong Yong Choi

doi:10.3390/nano10020392

Nanofiber NiMoO₄/g-C₃N₄ Composite Electrode Materials for Redox Supercapacitor Applications

Nanomaterials (Basel). 2020 Feb 23;10(2):392. doi: 10.3390/nano10020392.

Authors

Kannadasan Thiagarajan¹, Thirugnanam Bavani¹, Prabhakarn Arunachalam², Seung Jun Lee³, Jayaraman Theerthagiri^{3

4}, Jaganathan Madhavan¹, Bruno Georges Pollet⁵, Myong Yong Choi³

Affiliations

¹ Solar Energy Lab, Department of Chemistry, Thiruvalluvar University, Vellore 632 115, India.
² Electrochemistry Sciences Research Chair (ESRC), Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
³ Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University, Jinju 52828, Korea.
⁴ Centre of Excellence for Energy Research, Sathyabama Institute of Science and Technology (Deemed to be University), Chennai 600119, India.
⁵ Hydrogen Energy and Sonochemistry Research Group, Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway.

Abstract

NiMoO₄/g-C₃N₄ was fabricated by a hydrothermal method and used as an electrode material in a supercapacitor. The samples were characterized by XRD, FTIR, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to study the physical and structural properties of the as-prepared NiMoO₄/g-C₃N₄ material. The electrochemical responses of pristine NiMoO₄ and the NiMoO₄/g-C₃N₄ nanocomposite material were investigated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). From the CD studies, the NiMoO₄/g-C₃N₄ nanocomposite revealed a higher maximum specific capacitance (510 Fg^-1) in comparison to pristine NiMoO₄ (203 Fg^-1). In addition, the NiMoO₄/g-C₃N₄ composite electrode material exhibited high stability, which maintained up to 91.8% capacity even after 2000 charge-discharge cycles. Finally, NiMoO₄/g-C₃N₄ was found to exhibit an energy density value of 11.3 Whkg^-1. These findings clearly suggested that NiMoO₄/g-C₃N₄ could be a suitable electrode material for electrochemical capacitors.

Keywords: NiMoO4; NiMoO4/g-C3N4 composite; hydrothermal method; redox supercapacitors.

Abstract

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