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Rational Design of Porous Structured Nickel Manganese Sulfides Hexagonal Sheets‐in‐Cage Structures as an Advanced Electrode Material for High‐Performance Electrochemical Capacitors
Author(s) -
Khalafallah Diab,
Wu Zongxiao,
Zhi Mingjia,
Hong Zhanglian
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.201904991
Subject(s) - supercapacitor , materials science , capacitance , pseudocapacitor , current density , electrode , nickel , electrochemistry , manganese , power density , mesoporous material , chemical engineering , phosphide , nanotechnology , nanowire , optoelectronics , metallurgy , chemistry , catalysis , power (physics) , physics , biochemistry , quantum mechanics , engineering
The design of hierarchical electrodes comprising multiple components with a high electrical conductivity and a large specific surface area has been recognized as a feasible strategy to remarkably boost pseudocapacitors. Herein, we delineate hexagonal sheets‐in‐cage shaped nickel–manganese sulfides (Ni‐Mn‐S) with nanosized open spaces for supercapacitor applications to realize faster redox reactions and a lower charge‐transfer resistance with a markedly enhanced specific capacitance. The hybrid was facilely prepared through a two‐step hydrothermal method. Benefiting from the synergistic effect between Ni and Mn active sites with the improvement of both ionic and electric conductivity, the resulting Ni‐Mn‐S hybrid displays a high specific capacitance of 1664 F g −1 at a current density of 1 A g −1 and a capacitance of 785 F g −1 is maintained at a current density of 50 A g −1 , revealing an outstanding capacity and rate performance. The asymmetric supercapacitor device assembled with the Ni‐Mn‐S hexagonal sheets‐in‐cage as the positive electrode delivers a maximum energy density of 40.4 Wh kg −1 at a power density of 750 W kg −1 . Impressively, the cycling retention of the as‐fabricated device after 10 000 cycles at a current density of 10 A g −1 reaches 85.5 %. Thus, this hybrid with superior capacitive performance holds great potential as an effective charge‐storage material.