3D hierarchical core–shell structural NiCoMoS@NiCoAl hydrotalcite for high-performance supercapacitors

Abstract

Through a simple process, a hierarchical NiCoMoS@NiCoAl hydrotalcite (LDH) core-shell structure is prepared by growing the ultrathin NiCoAl-LDH nanosheets onto NiCoMoS nanoneedles arrayed on Ni foam (NF). After coating NiCoAl-LDH...

In Situ Transformation of Metal Molybdates into Polymetallic Sulfides with Enriched Edge Sites for High-Performance Supercapacitors

“…All the NiCoMoS samples demonstrated a typical type IV isotherm with a H3 hysteresis loop, pointing out the mesoporous structure (Figure 5A). 16,24 Additionally, the corresponding pore size distributions with 90% of the pore size for NiCoMoS were in the range of 16− 104 nm, further confirming the mesopore nature (Figure 5B). As seen in Figure 5B inset, S-doping could influence the textural property, where NiCoMoS (2.0) had the most specific surface area of 53 m 2 g −1 .…”

“…The specific surface area ( S BET ), pore volume ( V p ), and pore diameter ( D p ) were investigated by N 2 sorptometry, in which the N 2 adsorption–desorption isotherms of the NiCoMoS samples are displayed in Figure . All the NiCoMoS samples demonstrated a typical type IV isotherm with a H3 hysteresis loop, pointing out the mesoporous structure (Figure A). , Additionally, the corresponding pore size distributions with 90% of the pore size for NiCoMoS were in the range of 16–104 nm, further confirming the mesopore nature (Figure B). As seen in Figure B inset, S-doping could influence the textural property, where NiCoMoS (2.0) had the most specific surface area of 53 m 2 g –1 .…”

“…15 However, the low power density and easy agglomeration have become issues for long-duration applications. 10,16 Generally, there are two strategies to address the limitations: one approach is to dope heterogeneous metal ions into metal oxides and then convert the doped metal oxides into corresponding sulfides by sulfidation to improve the capacitive performance. 10,17 Another approach is to directly grow on current collectors, such as graphene, 10 carbon cloth (CC)/ textile, 17,18 and Ni foam (NF), 16 to form heterogeneous structures.…”

Co-doped amorphous NiMoS4 modified with rGO for high-rate performance and long-cycling stability of hybrid supercapacitors

“…All CV curves at different scan rates have a pair of redox peaks, corresponding to the reversible Faradaic properties of Ni 2+ and Ni 3+ states. 30 The CV curves of the electrode materials at different scan rates show no obvious polarization, which confirms that the optimized regulation of the nickel-cobalt element and the rGO composite composition brought about good redox reversibility. Fig.…”

High-performance supercapacitors based on amorphous carbon derived from natural Ramulus mori

“…38 An intense peak positioned at 2342 cm −1 is produced mainly owing to the introduction of heteroatoms in the carbon structure. 39 The signal located at 1120 cm −1 is attributed to C–O–C (symmetric angular deformation of ethers). 40…”