Marigold micro-flower like NiCo2O4 grown on flexible stainless-steel mesh as an electrode for supercapacitors

Gokul P Kamble; Anil A Kashale; Akash S Rasal; Seema A Mane; Rutuja A Chavan; Jia-Yaw Chang; Yong-Chien Ling; Sanjay S Kolekar; Anil V Ghule

doi:10.1039/d0ra09524a

Marigold micro-flower like NiCo₂O₄ grown on flexible stainless-steel mesh as an electrode for supercapacitors

RSC Adv. 2021 Jan 18;11(6):3666-3672. doi: 10.1039/d0ra09524a. eCollection 2021 Jan 14.

Authors

Gokul P Kamble¹, Anil A Kashale¹, Akash S Rasal^{1

2}, Seema A Mane¹, Rutuja A Chavan¹, Jia-Yaw Chang², Yong-Chien Ling³, Sanjay S Kolekar⁴, Anil V Ghule¹

Affiliations

¹ Green Nanotechnology Laboratory, Department of Chemistry, Shivaji University Kolhapur 416004 Maharashtra India avg_chem@unishivaji.ac.in.
² Department of Chemical Engineering, National Taiwan University of Science and Technology Taipei Taiwan.
³ Department of Chemistry, National Tsing Hua University Hsinchu 30013 Taiwan ycling@mx.nthu.edu.tw.
⁴ Analytical Chemistry and Material Science Research Laboratory, Department of Chemistry, Shivaji University Kolhapur 416004 Maharashtra India.

Abstract

Nanostructured NiCo₂O₄ is a promising material for energy storage systems. Herein, we report the binder-free deposition of porous marigold micro-flower like NiCo₂O₄ (PNCO) on the flexible stainless-steel mesh (FSSM) as (PNCO@FSSM) electrode by simple chemical bath deposition. The SEM and EDS analysis revealed the marigold micro-flowers like morphology of NiCo₂O₄ and its elemental composition. The porous nature of the electrode is supported by the BET surface area (100.47 m² g^-1) and BJH pore size diameter (∼1.8 nm) analysis. This PNCO@FSSM electrode demonstrated a specific capacitance of 530 F g^-1 at a high current density of 6 mA cm^-2 and revealed 90.5% retention of specific capacitance after 3000 cycles. The asymmetric supercapacitor device NiCo₂O₄//rGO within a voltage window of 1.4 V delivered a maximum energy density of 41.66 W h kg^-1 at a power density of 3000 W kg^-1. The cyclic stability study of this device revealed 73.33% capacitance retention after 2000 cycles. These results indicate that the porous NiCo₂O₄ micro-flowers electrode is a promising functional material for the energy storage device.