Facile synthesis of MgCo ₂ O ₄ hexagonal nanostructure via co‐precipitation approach and its supercapacitive properties

Abstract

Summary Magnesium cobalt oxide (MgCo2O4) hexagonal nanoplates were prepared via a fast and simple co‐precipitation process. The electrochemical properties of MgCo2O4 nanostructures were characterized by various techniques. Furthermore, the MgCo2O4 hexagonal nanoplate material was used for supercapacitors. In three‐electrode scheme, MgCo2O4 hexagonal nanoplate electrode demonstrated a good specific capacity of 164 mAh g−1 at 3 A g−1. Furthermore, an aqueous asymmetric supercapacitor (ASC) using MgCo2O4//activated carbon (AC) was also fabricated. The MgCo2O4//AC delivered 39 mAh g−1 of specific capacity at 1 A g−1. It revealed the high energy density of 28.34 W h kg−1 with the power density of 363 W kg−1 with the current density of 0.5 A g−1. The impressive electrochemical performance is mainly associated to high surface area of 55 m2 g−1 resulted from voids/gaps in‐between hexagonal nanoplates of MgCo2O4. Also, a toy motor fan, 11 light‐emitting diodes (LEDs), and a kitchen timer were functionalized by series linked two ASCs for practical applications.