Enhanced electrochemical activity by NiCo-P nano-particles modified Co-MOF nanorods

Abstract

The design and preparation of high-performance electrode materials are among the most extensively researched topics in supercapacitor studies. By combining the three-dimensional structure and compatibility of cobalt-based metal-organic framework (Co-MOF) with the high redox activity of metal phosphates, a green, efficient, and safe co-precipitation and electro-deposition strategy was employed to fabricate the Co-MOF@NiCo-P heterostructure composite electrode material, with NiCo-P nanoparticles uniformly decorated on the surface of Co-MOF, addressing the issues of limited conductivity of Co-MOF and the tendency of NiCo-P to aggregate when grown in situ on foam nickel. In a three-electrode system, the Co-MOF@NiCo-P electrode exhibits specific capacities of 1389.8 F g⁻¹ at 1 A g⁻¹ and 964.3 F g⁻¹ at 20 A g⁻¹. The assembled Co-MOF@NiCo-P//AC hybrid supercapacitor device demonstrates energy densities of 54.08 Wh kg⁻¹ (22.92 Wh kg⁻¹) and power densities of 825 W kg⁻¹ (8250 W kg⁻¹), showing promising application prospects. This research offers a novel method for developing high-performance electrode materials.