Probing the optical, magnetic and energy storage properties of co-precipitation routed ZnMn2O4

Abstract

In this work, ZnMn2O4 nanomaterial is synthesized by facile co-precipitation method. The ZnMn2O4 nanomaterial is figured out by numerous characteristic techniques. Further, optical property of ZnMn2O4 is obtained and, 2.5 eV energy band gap is observed. The magnetic property of ZnMn2O4 is also obtained. The M-H curves obtained at 300 K and 200 K show the paramagnetic behavior, wherever, at 5 K ZnMn2O4 nanomaterial indicate the anti-ferromagnetic ordering with the coercivity and remanent of 187 Oe and 0.5 emu g−1, respectively. Thereafter, the prepared nanomaterial is utilized for supercapacitor. The specific capacitance of 545 F g−1 is observed at 1 A g−1. Further, aqueous asymmetric supercapacitor (ASC) is designed by ZnMn2O4 as positive electrode and activated carbon (AC) as negative electrode. The high energy density of 27.5 W h kg−1 is received at 753 W kg−1 from ZnMn2O4//AC device. Furthermore, for practical electronic application, LEDs, motor fan and kitchen timer are functionalized by ZnMn2O4//AC devices.