MOF-derived Mo-CoP@NiFe LDH hierarchical nanosheets for high- performance hybrid supercapacitors

作者：Chen, Xing; Li, Shanze; Liu, Yuxin; Xie, Kun; Wang, Yuqiao^*

来源：Journal of Alloys and Compounds, 2022, 919: 165842.

DOI：10.1016/j.jallcom.2022.165842

• Layered double hydroxide
• MOF
• Hierarchical nanosheets
• Supercapacitor

The well-designed hierarchical nanosheets composed of different components can enhance specific capa-citances and cycling stabilities of electrode materials. Herein, Mo-CoP@NiFe layered double hydroxide (LDH) hierarchical nanosheets were prepared by growing NiFe LDH nanosheets on MOF-derived ultrathin Mo-CoP nanosheets fabricated by etching Co-MOF with Mo ions. The hierarchical nanosheet structure can facilitate the transport of electrons/ions and provide numerous electroactive sites. Furthermore, the sy-nergistic effects between the active materials provided more oxidation states for redox reactions. Owing to the hierarchical nanosheets and the synergistic effects between Mo-CoP and NiFe LDH, the Mo-CoP@NiFe LDH electrode exhibited a large specific capacity of 1655 C g(-1) (2796 F g(-1)) and good long-term stability with 79.6 % capacity retention after 8000 cycles. Additionally, the hybrid supercapacitor (HSC) delivered an energy density of up to 48.6 Wh kg(-1) at 800 W kg(-1) and outstanding cycling stability (90.6 % retention of the initial capacitance over 20,000 cycles).