Hydrothermal tellurization process for crafting nanostructured cobalt telluride: A hop advancing in supercapacitor and non-enzymatic glucose sensor

Abstract

The reliable performance of energy storage devices and glucose sensors depends on the deposition method and nanostructural-features of nanomaterials. Therefore, a simple inexpensive hydrothermal method is considered to craft cobalt-telluride (CoTe₂) electrode. The surface area of 54 m²g⁻¹, specific capacitance of 2907 Fg⁻¹ at 1 Ag⁻¹ and capacitance stability of 97 % for 14,000 cycles are observed for nanorods. The equivalent-series-resistance, Warburg-impedance and charge transfer resistance of electrode are -2/1.8, 2.80/2.81 and zero ohm before/after 14,000 cycles. The 88/56 % diffusive contribution are simulated at 5/170 mVs⁻¹. The electrode presented hybrid behavior as confirmed by Power's law simulations. Moreover, the deposited electrode is exhibited excellent amperometric responses in glucose concentration of 1–9 mM. The CoTe₂//AC device is delivered energy density of 280–109 Whkg⁻¹, power density of 2400–8500 Wkg⁻¹, cyclic life of 89 % and Coulombic efficiency of 93 % (10,000 cycles). It is concluded that electrode is efficient for both supercapacitors and catalytic activity.