Regular Article

Mg-doped NiCoP microflower grown on Ni foam for high-capacity supercapacitor electrode

School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, P.R. Chin

^* e-mail: caoshaokui@zzu.edu.cn, lizhang9@zzu.edu.cn

Received: 30 December 2022
Received in final form: 27 February 2023
Accepted: 8 March 2023
Published online: 17 April 2023

Abstract

In this work, a binder-free electrode Mg-doped NiCoP/Ni foam (MNCP-x/NF) was prepared via hydrothermal and phosphorization process, in which echinoid microflower-like MNCP-x was densely loaded on the NF skeleton. By regulating the Mg²⁺ doping amount, remarkable enhancements in the morphology, mass-loading of MNCP, electrode conductivity and overall electrochemical capacitive properties of MNCP-x/NF have been achieved. Particularly, moderate doped MNCP-0.5/NF exhibits the best energy storage performances with a superior specific capacity (4461 mC cm⁻² @ 2 mA cm⁻²), acceptable rate capability (retaining 50.1% @ 50 mA cm⁻²), and striking cyclability (retaining 83% over 5000 cycles). Moreover, a solid-state asymmetric supercapacitor constructed with MNCP-0.5/NF as cathode, graphene hydrogel/NF (GH/NF) as anode, PVA/KOH gel as electrolyte, outputs the notable energy density of 39.8 Wh kg⁻¹ (1.8 mWh cm⁻³) and power density of 16674 W kg⁻¹ (750 mW cm⁻³), companied by a superior cyclability (retaining 87% over 5000 cycles).