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One‐Step Controllable Synthesis of Mesoporous MgCo 2 O 4 Nanosheet Arrays with Ethanol on Nickel Foam as an Advanced Electrode Material for High‐Performance Supercapacitors
Author(s) -
Teng Yifei,
Li Yingdi,
Zhang Ziqing,
Yu Deyang,
Feng Yi,
Meng Yanan,
Tong Wenming,
Wu Yunpeng,
Zhao Xudong,
Liu Xiaoyang
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.201802274
Subject(s) - supercapacitor , nanosheet , materials science , capacitance , nickel , spinel , mesoporous material , electrode , hydrothermal circulation , nanotechnology , chemical engineering , electrochemistry , ternary operation , hydrothermal synthesis , transition metal , metallurgy , catalysis , chemistry , computer science , biochemistry , engineering , programming language
Abstract In recent years, ternary transition metal oxides (TTMOs), especially spinel type TTMOs have attracted widespread attention as promising candidates for electrode materials. Among all of the popular TTMOs, MgCo 2 O 4 is an outstanding one, owing to its superior theoretical capacitance. In this work, MgCo 2 O 4 nanosheet arrays (NSAs) grown directly on nickel foams were fabricated through a facile hydrothermal process at 120 °C for 4 h. With a series of structural and morphological characterization techniques, it was found that the ethanol played a key role in controlling the composition and morphology during the synthesis process. The MgCo 2 O 4 NSAs exhibited a superior specific capacitance of 853.06 C g −1 (at 1 mA cm −2 ) and enhanced cycling performance, with 94.65 % of initial capacitance retained after 3000 cycles when used as a binder‐free integrated electrode for electrochemical supercapacitors; much higher than other reported data for MgCo 2 O 4 as well. The excellent electrochemical properties mainly came from the unique morphology of the MgCo 2 O 4 NSAs. This study will demonstrate the applications of MgCo 2 O 4 NSAs based large‐scale supercapacitors grown on low‐cost nickel foams.