Honeycomb-like\nPorous Carbon–Cobalt Oxide Nanocomposite\nfor High-Performance Enzymeless Glucose Sensor and Supercapacitor\nApplications

Abstract

Herein,\nwe report the preparation of Pongam seed shells-derived\nactivated carbon and cobalt oxide (∼2–10 nm) nanocomposite\n(PSAC/Co₃O₄) by using a general and facile synthesis\nstrategy. The as-synthesized PSAC/Co₃O₄ samples\nwere characterized by a variety of physicochemical techniques. The\nPSAC/Co₃O₄-modified electrode is employed in\ntwo different applications such as high performance nonenzymatic glucose\nsensor and supercapacitor. Remarkably, the fabricated glucose sensor\nis exhibited an ultrahigh sensitivity of 34.2 mA mM^–1 cm^–2 with a very low detection limit (21 nM) and\nlong-term durability. The PSAC/Co₃O₄ modified\nstainless steel electrode possesses an appreciable specific capacitance\nand remarkable long-term cycling stability. The obtained results suggest\nthe as-synthesized PSAC/Co₃O₄ is more suitable\nfor the nonenzymatic glucose sensor and supercapacitor applications\noutperforming the related carbon based modified electrodes, rendering\npractical industrial applications.