Rational construction of ternary ZnNiP arrayed structures derived from 2D MOFs for advanced hybrid supercapacitors and Zn batteries

Exploiting nickel-based phosphide electrodes for next-generation high-performance supercapacitors and secondary batteries with high security has attracted great attentions. Herein, we fabricated binderless ZnNiP electrode based on Ni metal-organic framework and the optimized Zn-doping process, which achieved high electrochemical performance both in hybrid supercapacitor and Zn battery. Encouragingly, the addition of Zn source and the phosphating process make a component synergy with enhanced electronic conductivity, enriched electrochemical active centers and redox reactions. The ZnNiP-0.5 with sturdy construction exhibits a remarkable specific capacity and a good cycling stability in alkaline electrolyte. When assembled to hybrid supercapacitor, the installation delivers a maximum energy density of 67.4 Wh kg(-1), a maximum power density of 15.9 kW kg(-1), and outstanding cycling performance (88% retention after 10 000 cycles). Additionally, the fabricated Zn battery could achieve discharge voltage of similar to 1.9 V, with an admirable energy density of 529.58 Wh kg(-1) and also shows the excellent durability (capacity retention of 91.6% after 3000 cycles). This work offers a feasible route and provides a certain guiding significance for the reasonable design of binder-free electrodes with delicate structures and compositions, which may inspire new significative findings of building electrodes for high-security hybrid supercapacitors and alkaline batteries. (C) 2021 Published by Elsevier Ltd.

Automated summary

This study fabricated a ZnNiP electrode based on Ni metal-organic framework and optimized Zn-doping process, showing high electrochemical performance in both hybrid supercapacitor and Zn battery. The addition of Zn source and phosphating process enhanced electronic conductivity and electrochemical active centers, leading to ZnNiP-0.5 with remarkable specific capacity and cycling stability in alkaline electrolyte.