Cost effective Cr-doped Co(OH)2 nano-flower assemblies exhibiting excellent electrochemical performance for supercapacitors

Abstract

Chromium doping along with topology, the nano-flowers exhibit exceptional electrochemical performance. By systematically characterizing the prepared samples of pristine Co(OH)2 and Cr doped Co(OH)2 using a comprehensive series of analytical techniques, including XRD, SEM, TEM, EDX, FTIR, and PL, a profound understanding of their structural and morphological features is achieved. Paving the path for significant advancements in renewable energy storage technology exploration for prime and cost-effective electrode materials for supercapacitors is a major challenge. This paper presents an innovative study on Cr doped Co(OH)2 based nano-flowers. The synergistic role of the average size of fibrous structures comprising nano-flowers is in the range of 20 nm showing high surface area of the prepared sample. Electrochemical performance was acquired in 2 M KOH electrolyte by CV, GCD and EIS. To understand the rate of ion transport within the sample, diffusion coefficient has been calculated. The discernible improvement in redox behavior, maximize the capacitance of 3 % Cr-Co(OH)2 to 1252 Fg−1 and diffusion coefficient to 1.509 × 10−5 cm2s−1. Furthermore, the power law unveils the pseudocapacitive nature of 3 % Cr-Co(OH)2 electrode material and unprecedented cyclic stability by possessing retention rate of 93 % even after 5000 cycles. All these calculated properties exhibit the immense potential of doped nano-flowers as a reliable source of high-energy electrode material.