High‐efficiency sodium storage of Co0.85Se/WSe2 encapsulated in N‐doped carbon polyhedron via vacancy and heterojunction engineering
Ya Ru Pei,
Hong Yu Zhou,
Ming Zhao,
Jian Chen Li,
Xin Ge,
Wei Zhang,
Chun Cheng Yang,
Qing Jiang
Affiliations
Ya Ru Pei
Key Laboratory of Automobile Materials (Jilin University), Ministry of Education, School of Materials Science and Engineering Jilin University Changchun China
Hong Yu Zhou
Key Laboratory of Automobile Materials (Jilin University), Ministry of Education, School of Materials Science and Engineering Jilin University Changchun China
Ming Zhao
Key Laboratory of Automobile Materials (Jilin University), Ministry of Education, School of Materials Science and Engineering Jilin University Changchun China
Jian Chen Li
Key Laboratory of Automobile Materials (Jilin University), Ministry of Education, School of Materials Science and Engineering Jilin University Changchun China
Xin Ge
Jilin Provincial International Cooperation Key Laboratory of High‐Efficiency Clean Energy Materials, Electron Microscopy Center Jilin University Changchun China
Wei Zhang
Jilin Provincial International Cooperation Key Laboratory of High‐Efficiency Clean Energy Materials, Electron Microscopy Center Jilin University Changchun China
Chun Cheng Yang
Key Laboratory of Automobile Materials (Jilin University), Ministry of Education, School of Materials Science and Engineering Jilin University Changchun China
Qing Jiang
Key Laboratory of Automobile Materials (Jilin University), Ministry of Education, School of Materials Science and Engineering Jilin University Changchun China
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 Co0.85Se/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 Co0.85Se/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 Co0.85Se/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.
