3D layered MgCo2O4@CoMoO4 porous nanomaterial arrays grown on nickel foams: Preparation and application as high-performance electrodes for supercapacitor

Abstract

The advanced 3D layered porous MgCo2O4@CoMoO4 composite electrode (MCCo) was directly synthesized on a nickel foam substrate using a straightforward two-step hydrothermal approach. Among the various MCCo electrodes, the MCCo-7 h electrode demonstrated superior performance with a specific capacity of 2403 F g−1 due to its exceptional charge transfer internal resistance (Rs) and remarkable electrochemical characteristics. Notably, this performance surpassed that of MgCo2O4 (807 F g−1), MCCo-3 h (1224 F g−1), MCCo-5 h (1414 F g−1), MCCo-9 h (1936 F g−1), and CoMoO4-7 h electrode materials (442 F g−1). Furthermore, when MCCo-7 h was paired with activated carbon (AC) to construct a MCCo-7 h//AC device, it achieved an impressive energy density of 39 Wh kg−1 at a power density of 375 W kg−1, maintaining an impressive capacity retention of 83% even after 2000 cycles at a high current density of 5 A g−1. This groundbreaking work offers valuable insights and strategies for electrochemical energy storage and supercapacitors.