Sulfidation of Hierarchical NiAl−LDH/Ni−MOF Composite for High‐Performance Supercapacitor

Abstract

Designing nanocomposites with good electrochemical properties is the key to studying electrode materials for supercapacitors. In this paper, we report a well‐defined composite (NiAl‐LDH/Ni−MOF/S) prepared in three steps. After the synthesis of LDH nanoplates through a hydrothermal method, the MOF nanosheets were grown on its surface by in situ nucleation. In this procedure, the synergistic effect of MOF and LDH will improve the specific capacitance. Afterwards, the composite was subjected to a sulfidation treatment to enhance its electrical conductivity. Consequently, the NiAl‐LDH/Ni−MOF/S has an excellent specific capacitance (1670 F g−1 at 1 A g−1) and rate capability (65 % from 1 to 30 A g−1). Moreover, an asymmetric supercapacitor (ASC) was assembled with NiAl‐LDH/Ni−MOF/S as cathode and activated carbon as anode. The ASC displays a maximum energy density (35.4 Wh kg−1) and outstanding cycle stability (retention of 96.4 % after 10000 cycles at 10 A g−1), demonstrating the potential of the electrode for use in high‐efficiency electrochemical capacitors.

Mesoporous Nanohybrids of 2D Ni‐Cr‐Layered Double Hydroxide Nanosheets Pillared with Polyoxovanadate Anions for High‐Performance Hybrid Supercapacitor

“…[ 1,21–25 ] The performance of recently reported LDHs and their hybrids as HSC cathodes are summarized, as shown in Figure . [ 21–39 ]…”

A Hierarchically Porous ZIF@LDH Core‐Shell Structure for High‐Performance Supercapacitors

“…A larger CV curve fitting area also means a longer discharge time and a higher specific capacitance. [35] The CV diagrams with scan rates from 5 to 100 mV s À 1 of M-ZIF-67 and M-ZIF-67@LDH1-3 modified electrode are presented in Figure S9a Figure 4a. Due to the polarization of the electrode, the position of the oxidation and reduction peaks shifted slightly as the scan rate increased.…”

“…It can be seen that M‐ZIF‐67@LDH4 shows a larger response current, which means a superior pseudocapacitive behavior. A larger CV curve fitting area also means a longer discharge time and a higher specific capacitance [35] . The CV diagrams with scan rates from 5 to 100 mV s −1 of M‐ZIF‐67 and M‐ZIF‐67@LDH1‐3 modified electrode are presented in Figure S9a–d.…”

Enhanced ionic diffusion interface in hierarchical metal-organic framework@layered double hydroxide for high-performance hybrid supercapacitors

“…For instance, porous Ni-LDH/Ni-MOF and hollow NiFe 2 O 4 -NiCo-LDH@rGO were hydrothermally synthesized, showing satisfied specific capacitance and rate capability. [22,23] Although porous MOF/LDH displayed improved performance, the aggregation of LDH during the hydro-thermal reaction severely hinder the optimal performance [24][25][26]. For overcoming this issue, electro-deposition technique has been employed for fast constructing multimetallic MOF/LDH structures with excellent morphology [27,28].…”