Vertically Aligned Graphene-Like SnS₂ Ultrathin Nanosheet Arrays: Excellent Energy Storage, Catalysis, Photoconduction, and Field-Emitting Performances

Abstract

New layered SnS2 nanosheet arrays consisting of 1–5 atomic layers were synthesized directly on Sn foil as both the tin source and the metal current collector substrates by a simple biomolecule-assisted method. It is found that SnS2 nanosheets synthesized have excellent photoelectric applications, such as on lithium ion batteries, and photocatalytic, field emission, and photoconductive properties. Cyclic voltammetry and discharge and charge behaviors of the atomic SnS2 nanosheets were examined, and it shows that the average discharge capacity in 1050 mAh/g is much larger than the theoretical capacity at the 1C rate. The photocatalytic action driven by solar light is quite quick, and the degradation rate of RhB is 90%, only irradiated for 20 min when the content of SnS2 nanosheets is 0.4 g/L. The response of the SnS2 device to the incidence UV light is very fast and shows excellent photosensitivity and stability. In addition, field emission properties of SnS2 nanosheets were also researched, and we found that the turn-on field for SnS2 is 6.9 V/μm, which lowered ever reported values. The enhanced photoelectric properties are likely to originate in a graphene-like structure. Thus, graphene-like SnS2 materials are promising candidates in the photoelectric field.

Origin of the Increased Li+‐Storage Capacity of Stacked SnS2/Graphene Nanocomposite

“…[6] The calcination heatt reatment after hydrothermal processing recrystallizedt he SnS 2 nanoplates into nanosheets.T he conditions were carefully chosen so that SnS 2 was stable during the calcination. [7,12] The disappearance of discrete SnS 2 nanoplates is apparent in both field-emission scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images. ( Figure3)I nt he as-formed stacked SnS 2 /graphene nanocomposite, the thickness of the composited sheets was around 10 nm.…”

Synthesis of hierarchical MoS2 microspheres composed of nanosheets assembled via facile hydrothermal method as anode material for lithium-ion batteries

“…Therefore, development of advanced anode materials attracts great attention of the researchers worldwide. Among them, metal sulfides are promising material due to their high capacities (Zhong et al 2012;Vaughn et al 2012;Lai et al 2012;Liu et al 2012a;Gu et al 2013;Fei et al 2013). Molybdenum disulfide (MoS 2 ) is an ''inorganic analogue of graphene'', which has drawn particular research interest: it has a very high capacity about 670 mAh g -1 upon insertion of 4 mol of Li ?…”

Engineering Vertical Aligned MoS 2 on Graphene Sheet Towards Thin Film Lithium Ion Battery

“…This lowers the complete utilization of the electrochemical surface area of layered materials. Hence, the favorable vertical designing can offer new opportunities for the electrolyte ions to enhance interaction with all of the layers, leading to a full utilization of the high surface area offered by the layers [25], and facile accommodation of the strains caused by lithium intercalation and deintercalation [26].…”