High-efficiency sodium storage of Co_0.85Se/WSe₂ encapsulated in N-doped carbon polyhedron via vacancy and heterojunction engineering

Abstract

With the advantage of fast charge transfer, heterojunction engineering is identified as a viable method to reinforce the anodes' sodium storage performance. Also, vacancies can effectively strengthen the Na⁺ adsorption ability and provide extra active sites for Na⁺ adsorption. However, their synchronous engineering is rarely reported. Herein, a hybrid of Co_0.85Se/WSe₂ heterostructure with Se vacancies and N-doped carbon polyhedron (CoWSe/NCP) has been fabricated for the first time via a hydrothermal and subsequent selenization strategy. Spherical aberration-corrected transmission electron microscopy confirms the phase interface of the Co_0.85Se/WSe₂ heterostructure and the existence of Se vacancies. Density functional theory simulations reveal the accelerated charge transfer and enhanced Na⁺ adsorption ability, which are contributed by the Co_0.85Se/WSe₂ heterostructure and Se vacancies, respectively. As expected, the CoWSe/NCP anode in sodium-ion battery achieves outstanding rate capability (339.6 mAh g^-1 at 20 A g^-1), outperforming almost all Co/W-based selenides.

Keywords

Co _0.85Se/WSe ₂ heterostructure / density functional theory simulations / N-doped carbon polyhedron / Se vacancies / sodium-ion batteries

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