Considering the advantages of these two metal sulfides, a hybrid composite by combining Fe 1− xS with MoS 2 can be rationally designed and fabricated to expectedly achieve the desirable performance.Ĭonstructing unique heterostructures to create diverse interface effects offers unprecedented opportunities in various fields, such as solar cells, photocatalysis and electrocatalysis. In particular, the large interlayer spacing (0.62 nm) and high mechanical strength of MoS 2 are able to facilitate Na + migration and alleviate structural deformation during the discharge/charge processes. Besides Fe 1− xS, 2D layered molybdenum disulfide (MoS 2) is another promising anode candidate for SIBs due to its analogous structures to graphite. Nonetheless, there are still obstacles to its commercial applications mainly due to the poor intrinsic conductivity and severe volume changes during the sodiation/desodiation processes, thus resulting in inferior cycling stability and rate capability. As a typical example, iron sulfide (Fe 1− xS) has risen to prominence because of its high theoretical capacity (~ 610 mAh g −1), natural abundance and environmental benignity. Moreover, the weaker M–S bond than M–O bond is more kinetically favorable for electrochemical conversion reaction, leading to a better redox kinetics and reversibility. Among the various anode materials, transition metal sulfides (M xS y) have drawn extensive attentions due to their high sodium storage capacity. The key point to achieve high-performance SIBs relies on the rational design of electrode materials with satisfactory Na ions insertion/extraction performance during repeated cycles, especially for the active anode host materials. However, the sluggish reaction kinetics induced by the larger ionic radius of Na ions deteriorates their electrochemical properties seriously. Sodium ion batteries (SIBs) have aroused great interests as a promising substitute to conventional lithium ion batteries (LIBs) owing to the overwhelming superiority in low cost and abundant natural resources.

Naclo4 xps peak sodium ion