In-Situ Synthesis Strategy of S-Doped Hierarchical Ni-MOF Nanosheet Supercapacitor Electrodes via Nickle Foam Etching
Hua Yang, Yi Duan, Huiling Gu, Lihua Liu, Hongtao Guan, Chengjun Dong, Gang Chen
Abstract
Metal–organic frameworks (MOFs) with porous structures are beneficial for electrochemical energy storage. Herein, the in-situ growth of the S-doped Ni-MOF nanosheet (S-NMN) on the surfaces of nickel foams was prepared via a facile solvothermal process. Owing to the rich active sites, small transport barrier, and excellent mechanical stability, the fabricated S-NMN-2 electrode displays a high specific capacity (1952 mF cm –2 at 1 mA cm –2 ), satisfactory rate performance, and remarkable cyclic stability. For practical application, the assembled S-NMN-2//AC device achieves a high energy density of 0.189 mWh cm –2 at the power density of 1.600 mW cm –2 with prominent cycling stability (93.27% capacity retention after 4000 cycles). The facile strategy of etching nickel foam demonstrates a new idea for developing high-performance supercapacitor materials.