A high-performance sodium anode composed of few-layer MoSe₂ and N, P doped reduced graphene oxide composites

Abstract

Capacity and stability enhancement has been observed for MoSe2 covered with N, P-doped rGO sheets. The sodiation behaviour was also investigated through different ex situ studies.

A 3D Trilayered CNT/MoSe2/C Heterostructure with an Expanded MoSe2 Interlayer Spacing for an Efficient Sodium Storage

“…The electrochemical performance of CNT/MoSe 2 /C composite was assessed via cyclic voltammetry (CV) measurements with the initial four cycles scanned at 0.3 mV s −1 in a voltage range of 0.01-3.00 V (Figure 5a). [44,45] From the second cycle onward, the shape of the curves together with the cathodic and anodic peak positions of the CNT/MoSe 2 /C overlaps and this is consistent with a high degree of electrochemical reversibility and stability. The first cathodic or reduction peak at 0.48 V pertained to the intercalation of Na + into MoSe 2 layers to form Na x MoSe 2 .…”

Facile Synthesis of Ultra‐Small Few‐Layer Nanostructured MoSe2 Embedded on N, P Co‐Doped Bio‐Carbon for High‐Performance Half/Full Sodium‐Ion and Potassium‐Ion Batteries

“…As shown in Figure c, the prolonged cycling performance and coulombic efficiency of the MoSe 2 /NP‐C‐2 electrode were investigated at 1 and 5 A g −1 . Impressively, the MoSe 2 /NP‐C‐2 electrode delivers a superior stable capacity of 276 mAh g −1 at 1.0 A g −1 after 500 cycles and 192 mAh g −1 at 5.0 A g −1 even after 1000 cycles, which is one of the best performances for MoSe 2 ‐based anode materials for SIBs reported so far (Table S1 in the Supporting Information) . The CEs of the MoSe 2 /NP‐C‐2 anode approach 96 % in the second cycle and increased to about 100 % in the subsequent cycles.…”

“…However, the weak van der Waals interaction between adjacent Se‐Mo‐Se layers, high surface energy of 2D layers, and inherently low electronic conductivity of bulk MoSe 2 give rise to aggregation of MoSe 2 layers easily and immense volume expansion/contraction, which makes it difficult to function as SIB/PIB electrode materials with satisfactory performance . To ameliorate these drawbacks, various strategies have been attempted, including construction of MoSe 2 with carbon composites, fabricating novel MoSe 2 nanostructures, and rational design of few‐layer MoSe 2 . For instance, MoSe 2 @hollow carbon nanosphere (HCNS) composites assembled with few‐layer MoSe 2 nanosheets confined within HCNS were successfully fabricated by a facile strategy reported by Sun et al., and these composites delivered a high capacity of 502 mAh g −1 at 1 A g −1 for SIBs .…”

“…Guo's group fabricated a core–shell nanostructured hybrid (pistachio‐shuck‐like MoSe 2 /C) with an enlarged interlayer spacing of 0.85 nm, and it presented a high capacity of 322 mAh g −1 at 0.2 A g −1 for PIBs . Moreover, previous research has elucidated that few‐layered MoSe 2 could promote the reaction kinetics of Na + /K + , improving the rate performance . Even though these results demonstrated that the sodium/potassium storage properties can be improved, it is still highly desirable to explore facile, scalable, and effective strategies to further fabricate the MoSe 2 ‐based materials with fascinating cycling stability and high rate capacity for SIBs/PIBs.…”

“…[46][47][48][49] To ameliorate these drawbacks, variouss trategies have been attempted, includingc onstruction of MoSe 2 with carbon composites, fabricating novel MoSe 2 nanostructures, and rational design of few-layer MoSe 2 . [50][51][52][53] For instance, MoSe 2 @hollow carbon nanosphere (HCNS)c omposites assembled with fewlayer MoSe 2 nanosheets confined within HCNS were successfully fabricated by af acile strategy reported by Sun et al,a nd these composites delivered ah igh capacity of 502 mAh g À1 at 1Ag À1 for SIBs. [53] Guo's group fabricated ac ore-shell nanostructured hybrid (pistachio-shuck-like MoSe 2 /C) with an enlarged interlayer spacingo f0 .85 nm, and it presented ah igh capacityo f3 22 mAh g À1 at 0.2 Ag À1 for PIBs.…”