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A MnCo 2 O 4 @NiMoO 4 Core‐Shell Composite Supported on Nickel Foam as a Supercapacitor Electrode for Energy Storage
Author(s) -
Chen Tao,
Shi Rui,
Zhang Yuanyuan,
Wang Zhenghua
Publication year - 2019
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201800549
Subject(s) - supercapacitor , capacitance , materials science , electrode , composite number , power density , electrochemistry , nickel , energy storage , current density , carbon fibers , composite material , metallurgy , power (physics) , chemistry , thermodynamics , physics , quantum mechanics
A MnCo 2 O 4 @NiMoO 4 composite was synthesized on nickel foam by a two‐step method. The composite has a core‐shell structure in which MnCo 2 O 4 nanoneedles are wrapped by NiMoO 4 nanoflakes. The MnCo 2 O 4 @NiMoO 4 /Ni foam is applied as a binder‐free electrode for supercapacitors and it achieves a specific capacitance of up to 1718 F g −1 at a current density of 1 A g −1 , and 84 % capacitance retention after 6000 charge‐discharge cycles. The capacitance of the MnCo 2 O 4 @NiMoO 4 composite is much higher than MnCo 2 O 4 nanoneedles and NiMoO 4 nanoflakes alone. Moreover, a hybrid supercapacitor is assembled by applying the MnCo 2 O 4 @NiMoO 4 /Ni foam as the positive electrode, activated carbon/Ni foam as the negative electrode. The hybrid supercapacitor reaches an energy density of up to 42.3 W h kg −1 at a power density of 797 W kg −1 , a power density of 6256 W kg −1 at an energy density of 17.4 W h kg −1 , and 86 % capacitance retention after 2000 charge‐discharge cycles. The results suggest that the rational design of electrode materials with such structure and composition is an effective strategy to improve electrochemical performance.