A NiCo2S4 /hierarchical porous carbon for high performance asymmetrical supercapacitor

Ultrafast Microwave Synthesis of Nickel-Cobalt Sulfide/Graphene Hybrid Electrodes for High-Performance Asymmetrical Supercapacitors

“…As shown in Figure i, the HR-TEM image exhibits the conspicuous difference between NCS and graphene through their well-resolved lattice fringes and individual interplanar spacings. The interplanar spacings of 0.242 nm (Figure j) and 0.281 nm (Figure k) correspond to the (111) and (311) planes of the NiCo 2 S 4 cubic phase. , The interplanar distance of 0.252 nm (Figure l) can be attributed to the (100) plane of the CoS phase. , The lattice fringe with the interplanar spacing of 0.358 nm (Figure m) was assigned to the (002) plane of hexagonal graphitic carbon. , The HRTEM results are consistent well with the XRD results.…”

“…As shown in the inset of Figure i, the last 10 charge/discharge cycles show a slightly longer charge/discharge time and have no obvious deformation compared to the first 10 cycles, verifying its excellent electrochemical stability. As the strong cycling stability of AC electrodes has been known, the outstanding cycling stability of the ASC should be due to the high stability of the NCS/graphene electrode and the shallow discharge process of the battery-type NCS/graphene electrode in this ASC setup . Based on the above discussion, the superior electrochemical performance of the NCS/graphene electrode might be mainly attributed to: (1) the synergistic effect of uniformly distributed NCS particles and graphene substrates, in which the highly conductive graphene substrates provided a large contact surface area and high electrical conductivity for the electrode.…”

Dual-functional NiCo2S4 polyhedral architecture with superior electrochemical performance for supercapacitors and lithium-ion batteries

“…However, the rates of Faradaic reactions for pseudocapacitors are usually not competitive compared to ion transportation rate, herein, the improvements of the rate capability for electrode materials are vitally important [10,11]. In addition, volume collapse during the reaction will lead to irreversible degradation on the cycling stability of electrode materials [12]. Herein, the rational design and synthese of mesoporous nano-architectures to increase surface reaction areas and to inhibit the structure collapse are appropriate techniques to realize the high-performance electrodes of supercapacitors [13][14][15].…”

MnO2/carbon nanocomposite based on silkworm excrement for high-performance supercapacitors

“…Besides the huge reserve and economic factor, the inherent elementary composition and crude structure of biomass have offered them a great prospect as carbon precursors. Recently, different types of biomass-derived activated carbon materials have been considered as capacitor electrode materials or conductive carbonaceous matrices, such as abandoned starches [28], cotton stalks [29], rice husks [30], pomelo peels [31], bamboos [32], peanut shells [33], and tea seed shells [34]. The porosity distribution and surface area of biomass carbon materials play essential roles in most electrochemical energy storage and conversion devices, which are attributed to the materials' ion transporting channels and ion storage sites.…”