Enhanced Lithium Storage Property Boosted by Hierarchical Hollow-Structure WSe₂ Nanosheets/N, P-Codoped Carbon Nanocomposites

Abstract

Developing hierarchical nanostructures composed of transition-metal dichalcogenides and hollow carbon matrixes is one of the attractive avenues in energy storage and conversion field on account of their unique the synergistic effect and stable architecture. Herein, N, P-codoped hollow carbon nanocomposites combined with WSe2 nanosheets were fabricated via a robust strategy including a metal chelation coordination method and high-temperature selenization treatment. Such a typical hollow structure can offer numerous reaction sites and more diffusion paths to accelerate the transport of Li-ions. In addition, the carbon substrate is able to enhance electric conductivity and alleviate the aggregation of the WSe2 nanosheets. As a result, the as-prepared WSe2 nanosheets/N, P-codoped carbon nanocomposites deliver the rate capability of 477 mA h g–1 at 5.0 A g–1. This electrode demonstrates super-durable cyclability after 3000 cycles with the capability of 620 mA h g–1 at 1.0 A g–1. Moreover, the as-prepared sample displays a high-power density (4987.5 W kg–1), high-energy density (125.1 W h kg–1), and impressive cyclic durability, when assembled with activated carbon for hybrid Li-ion capacitors. This work proposes an effective approach to design advanced hierarchical nanostructures in various energy-related applications.

Exploring 2D Energy Storage Materials: Advances in Structure, Synthesis, Optimization Strategies, and Applications for Monovalent and Multivalent Metal‐Ion Hybrid Capacitors

“…Another example, WSe 2 /NPCs nanocomposite, was given by Wang et al. [ 287 ] WSe 2 , as one of the TMDCs, has attracted tremendous attention on account of the attractive energy density, higher reversible capacity, and faster ion diffusion rate owing to the larger interlamellar space (≈6.50 Å). However, the severe aggregation and poor conductivity of WSe 2 lead to the inferior cycling ability and attenuation of capability.…”

“…Since then, different kinds of TMDCs have emerged and been fully used in LIHCs, including CoS, [282] MoSe 2 , [283] MoS 2 , [284][285][286] and WSe 2 . [287] In 2019, based on simple and efficient hydrothermal method, a CoS nanosheets self-assembled 3D hierarchically structure (Figure 17d,e) was synthesized by Kong's group. [282] The obvious charge-discharge plateau in GCD curves suggested a conversion-type storage mechanism and a specific capacity of 434 mAh g −1 can be observed (Figure 17f).…”

Freestanding ReS2/Graphene Heterostructures as Binder-Free Anodes for Lithium-Ion Batteries

“…Furthermore, the 3DRG electrode shows a much bigger specific capacity than the theoretical capacity of ReS 2 (∼430 mAh g −1 ) in Figure 5d, which was previously reported in many research studies on TMD-based composite anodes. 10,47,48 A reasonable explanation can be summarized as follows. In general, nanostructured electrode materials have stronger lithium storage capabilities than the corresponding bulk or large-size electrode materials.…”

Efficient Lithium/Sodium‐Ion Storage by Core–Shell Carbon Nanospheres@TiO2 Decorate by Epitaxial WSe2 Nanosheets Derived from Bimetallic Polydopamine Composites

“…[ 18,19 ] Moreover, our group developed a series of M‐PDA composites for electrochemical performance such as W‐PDA and Mo‐PDA composites. [ 20–22 ] It was found that the content of reactants and the ratio of solvents always play an important role in the final morphology. For bimetallic dopamine composites, multicomponent design and structural modulation can effectively improve electrochemical performance.…”

“…[18,19] Moreover, our group developed a series of M-PDA composites for electrochemical performance such as W-PDA and Mo-PDA composites. [20][21][22] It was found that the content of reactants and Metal-polydopamine coordination chemistry attracts great attention owing to the synergistic effect of adjustable components and advantageous structures. However, few efforts have been devoted to exploring bimetal-polydopamine composites, especially for multistructural composites with high-capacity components and high stability.…”