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Ultrathin Mn Doped Ni‐MOF Nanosheet Array for Highly Capacitive and Stable Asymmetric Supercapacitor
Author(s) -
Zheng Dengchao,
Wen Hao,
Sun Xun,
Guan Xin,
Zhang Jie,
Tian Wenli,
Feng Hao,
Wang Hongjing,
Yao Yadong
Publication year - 2020
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.202003220
Subject(s) - supercapacitor , nanosheet , capacitance , materials science , electrode , power density , capacitive sensing , nickel , chemical engineering , doping , carbon fibers , nanotechnology , optoelectronics , composite material , composite number , power (physics) , chemistry , metallurgy , electrical engineering , physics , engineering , quantum mechanics
In this study, we demonstrate that an Mn‐doped ultrathin Ni‐MOF nanosheet array on nickel foam (Mn 0.1 ‐Ni‐MOF/NF) serves as a highly capacitive and stable supercapacitor positive electrode. The Mn 0.1 ‐Ni‐MOF/NF shows an areal capacity of 6.48 C cm −2 (specific capacity C : 1178 C g −1 ) at 2 mA cm −2 in 6.0 m KOH, outperforming most reported MOF‐based materials. More importantly, it possesses excellent cycle stability to maintain 80.6 % capacity after 5000 cycles. An asymmetric supercapacitor device utilizing Mn 0.1 ‐Ni‐MOF/NF as the positive electrode and activated carbon as the negative electrode attains a high energy density of 39.6 Wh kg −1 at 143.8 Wkg −1 power density with a capacitance retention of 83.6 % after 5000 cycles.