A simple chemical approach for synthesis of Sr2Co2O5 nanoparticles and its application in the detection of chloramphenicol and in energy storage systems

Abstract

In the present work, a simple hydrothermal synthesis of novel Sr 2 Co 2 O 5 Nanoparticles (NPs) was reported. The physical and chemical properties of Sr 2 Co 2 O 5 NPs were investigated by various spectral and analytical tools such as FT-IR, Raman, XRD, SEM, TEM, EDX, XPS and N 2 adsorption studies. The as-synthesized Sr 2 Co 2 O 5 NPs were explored for sensing of chloramphenicol in milk sample and for energy storage applications. The working potential window of electrochemical reduction of chloramphenicol (CAP) is 0.3 to -1 V with the fixed scan rate of 0.05 V/s and peak potential was obtained at -0.57 V. Sr 2 Co 2 O 5 NPs modified GCE electrode (Sr 2 Co 2 O 5 NPs/GCE) showed outstanding result for sensing of CAP with a desirable wide linear range of 0.01 to 21.1 and 31.1 to 931.1 μM and a lowest detection limit of 0.0023 and 0.011 μM respectively. The supercapacitive behavior of Sr 2 Co 2 O 5 NPs coated Ni foil electrodes was investigated by performing Cyclic Voltammogram (CV), Galvanostatic Charge-Discharge measurement (GCD) and electrochemical impedance spectroscopy (EIS) analysis in 1 M aqueous KOH electrolyte. Sr 2 Co 2 O 5 NPs/Ni foil electrode delivered a specific capacitance of 683 F/g at the scan rate of 5 mV/s with significant cycling stability (88% retention after 5000 cycles, 2 Ag −1 ). These results proved that Sr 2 Co 2 O 5 NPs could be utilized as the suitable electrode material for sensor and energy applications. • Novel Sr 2 Co 2 O 5 NPs were prepared via hydrothermal route. • As-prepared Sr 2 Co 2 O 5 NPs were evaluated for its electrochemical applications. • Sr 2 Co 2 O 5 NPs/GCE electrode showed a lowest detection limit of 10.5 nm. • Sr 2 Co 2 O 5 NPs/Ni foil delivered Csp value of 683 Fg −1 at 5 mVs −1 scan rate.