Cobalt molybdate nanoflowers decorated bio-waste derived porous activated carbon nanocomposite: A high performance electrode material for supercapacitors

M S Vaishali; Priyadarshini N; Kiran Kumar Tadi; Ilaiyaraja P

doi:10.1016/j.chemosphere.2024.141965

Cobalt molybdate nanoflowers decorated bio-waste derived porous activated carbon nanocomposite: A high performance electrode material for supercapacitors

Chemosphere. 2024 Apr 13:357:141965. doi: 10.1016/j.chemosphere.2024.141965. Online ahead of print.

Authors

M S Vaishali¹, Priyadarshini N², Kiran Kumar Tadi³, Ilaiyaraja P³

Affiliations

¹ Department of Chemistry, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, 603110, Tamil Nadu, India.
² Department of Chemistry, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, 603110, Tamil Nadu, India. Electronic address: priyadarshinin@ssn.edu.in.
³ Chemistry Division, School of Advanced Sciences, Vellore Institute of Technology, Chennai, 600127, Tamil Nadu, India.

PMID: 38621491
DOI: 10.1016/j.chemosphere.2024.141965

Abstract

In this work, we report a supercapacitor electrode material based on nano-flower like cobalt molybdate decorated on porous activated carbon derived from waste onion peels (β-CoMoO₄-POAC). The obtained POAC exhibits highly porous structure and after the hydrothermal treatment with salts of cobalt and molybdenum, we observed a uniform distribution of β-cobalt molybdate (β-CoMoO₄) as nano-flowers on the surface of POAC. The chemical composition, morphology and porosity of the materials were thoroughly analyzed using field emission scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, infrared spectroscopy and Brunauer-Emmet-Teller surface area measurement. Due to its flower like and highly porous morphology, β-CoMoO₄@POAC exhibits a high specific capacitance of 1110.72 F/g at a current density of 1 mA/cm² with superior cyclic retention of 96.03% after 2000 cycles. The best electrochemical performance exhibited by β-CoMoO₄@POAC is mainly due to its high surface area and porous nature of the material which assists in active transport of ions. This study reveals the exceptional electrochemical properties of β-CoMoO₄@POAC which could be considered as a potential material for advanced energy storage devices.

Keywords: Activated carbon; Bio-waste; Cobalt molybdate (CoMoO(4)); Electrode; Onion peel; Supercapacitor.