Monodisperse polar NiCo2O4 nanoparticles decorated porous graphene aerogel for high-performance lithium sulfur battery

Recent advancements in 3D porous graphene-based electrode materials for electrochemical energy storage applications

“…After 200 cycles the capacitance was still maintained at 668 and 577 mAh g -1 for the same above-mentioned loading concentration of sulfur at 1.0 C. The specific surface area of sulfur-doped VN/N-rGO is about 5.9 m 2 g -1 with a reduced pore volume from 0.75 to 0.02 m which results in such high capacitance. Similarly, Tian et al also reported on NiCo 2 O 4 nanoparticle-dispersed porous graphene aerogel composite (NCO-GA/S) for improved capacitance activity of LSB synthesized by hydrothermal approach followed by freeze drying and annealing [64]. The reported specific surface area of NCO-GA is about 82 m 2 g -1 .…”

In situ construction of NiCo2O4 nanosheets on nickel foam for efficient electrocatalytic oxidation of benzyl alcohol

“…each other with a nanosheet thickness of ∼5 nm, displaying the lattice distance of 0.20 nm and 0.24 nm corresponding to the (400) and ( 211 2+ and Co 3+ forms. 37,38 Meanwhile, the O 1s XPS spectrum (Fig. 3d) can be divided into three characteristic peaks for O1, O2 and O3 at binding energies of 532.4, 531.2 and 529.6 eV, respectively, which represent hydroxyl species and typical metal-oxygen bonds, respectively.…”

Flexible self-supporting interconnected cobalt sulfide nanosheets enable high-loading and long-cycling Li-S batteries with high areal capacity

“…These results indicate that chemical interactions between metallic polar Co 9 S 8 nanosheets and sulfur species signi cantly enhance the contact of Co 9 S 8 -CC/active material[50]. Fig.S3c and dfurther show the correlation between Z re and ω -1/2 of Co 9 S 8 -CC/Li 2 S 6 and CC/Li 2 S 6 cathodes before and after 100 cycles, where the slope re ects Warburg factor correlated with Li + diffusion[11]. Slope for Co 9 S 8 -CC/Li 2 S 6 cathode is much smaller compared to CC/…”

“…Compared to the pristine Li 2 S 6 solution, the intensities of characteristic S 6 2peaks located at ~ 280 nm of CC and Co 9 S 8 -CC in the absorption spectra decrease obviously after absorption for 1 h [22]. The much lower S 6 2peak intensity of Co 9 S 8 -CC than that of CC implies again that the polar Co 9 S 8 nanosheets possess strong a nity and adsorption to trap LiPSs and suppress the shuttle effect during charging/discharging processes [11].…”

“…To conquer these challenges, several strategies including construction of sulfur composite cathodes, designing of functional separators, protection of Li metal and application of electrolyte additives have been proposed [11][12][13][14][15][16][17]. Various carbon matrixes, including carbon nano ber, carbon nanotube, carbon cloth and graphene, have been applied to encapsulate sulfur to construct the composite sulfur cathode [18][19][20][21].…”