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A Zinc Cobalt Sulfide Nanosheet Array Derived from a 2D Bimetallic Metal–Organic Frameworks for High‐Performance Supercapacitors
Author(s) -
Tao Kai,
Han Xue,
Cheng Qiuhui,
Yang Yujing,
Yang Zheng,
Ma Qingxiang,
Han Lei
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201800960
Subject(s) - nanosheet , supercapacitor , bimetallic strip , materials science , cobalt , cobalt sulfide , sulfide , zinc , chemical engineering , electrolyte , electrochemistry , inorganic chemistry , electrode , metal organic framework , metal , nanotechnology , chemistry , metallurgy , organic chemistry , adsorption , engineering
Porous ternary metal sulfide integrated electrode materials with abundant electroactive sites and redox reactions are very promising for supercapacitors. Herein, a porous zinc cobalt sulfide nanosheet array on Ni foam (Zn‐Co‐S/NF) was constructed by facile growth of 2D bimetallic zinc/cobalt‐based metal–organic framework (Zn/Co‐MOF) nanosheets with leaf‐like morphology on NF, followed by additional sulfurization. The Zn‐Co‐S/NF nanosheet array acted directly as a supercapacitor electrode showing much better electrochemical performance (2354.3 F g −1 and 88.6 % retention over 1000 cycles) when compared with zinc cobalt sulfide powder (355.3 F g −1 and 75.8 % retention over 1000 cycles), which originates from good electrical conductivity and mechanical stability, abundant electroactive sites, and facilitated transportation of electrons and electrolyte ions due to the unique nanosheet array structure. An asymmetric supercapacitor (ASC) device assembled from Zn‐Co‐S/NF and activated carbon electrodes can deliver a highest energy density of 31.9 Wh kg −1 and a maximum power density of 8.5 kW kg −1 . Most importantly, this ASC also shows good cycling stability (71.0 % retention over 10000 cycles). Furthermore, a red LED can be powered by two connected ASCs, and thus as‐synthesized Zn‐Co‐S/NF has great potential for practical applications.