NiS2 nanodots on N,S-doped graphene synthesized via interlayer confinement for enhanced lithium-/sodium-ion storage

Low-content SnO2 nanodots on N-doped graphene: lattice-confinement preparation and high-performance lithium/sodium storage

“…Such an enhancement was reported in our recent study, 60 which demonstrated that the low-content NiS 2 nanodot (11.0 wt%)/N,S-rGO composite prepared from a LDH host/ [NiEDTA] 2− guest precursor via a different interlayer nanoconfinement delivered greatly boosted electrochemical performances compared with pristine N,S-rGO without NiS 2 . Second, the smaller specific surface area of the composite (132 m 2 g −1 ) as compared to that of the counterpart (156 m 2 g −1 ) facilitated alleviation of the undesirable SEI side effects, and contributed to the reversible capacity.…”

S@C composites constructed by a graded pore-making strategy for Mg–S batteries with outstanding rate performance

“…We observed that the positions of the oxidation and reduction peaks shifted slightly toward the lateral potential as the scan rate increased from 0.2 to 1.0 mV s À1 , caused by the inherent impedance of the material. 39,40 At a scan rate of 0.2 mV s À1 , all CV curves were similar in shape, and the curves of the first five cycles of CV largely overlapped, indicating a prominent electrochemical reaction with good reversibility (Fig. 5b).…”

A NiS2/C composite as an innovative anode material for sodium-ion batteries: ex situ XANES and EXAFS studies to investigate the sodium storage mechanism

“…The first peak found at 1.35 V during the cathodic cycle suggests the intercalation reaction of Na + ions into NiS 2 by forming Na x NiS 2 /C, while during the second cycle, it is slightly shifted to 1.45 V, suggesting an irreversible conversion reaction of Na 2 S and Ni. 46,47 The peak at 0.71 V corresponds to the formation of a solid electrolyte interface which results initially in the decrease of the charge/discharge capacity. 48 The shoulder peak appearing at 0.38 V refers to conversion reactions where Ni and Na 2 S lead to the formation of polysulphides from Na 2 S as during the sodiation/desodiation process, sodium polysulphides as intermediates are known to dissolve in the electrolyte solution.…”