High electrochemical sodium storage performance of ZnSe/CoSe@N-doped porous carbon synthesized by the in-situselenization of ZIF-8/67 polyhedron

• Published in: Applied surface science Vol. 518; p. 146259
• Main Authors: Jia, Miao, Jin, Yuhong, Zhao, Chenchen, Zhao, Peizhu, Jia, Mengqiu
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.07.2020
• Subjects: Bimetallic selenides; Carbon rhombic dodecahedron; Hollow structure; Metal organic framework; Sodium ion battery; Carbon rhombic dodecahedron; Hollow structure; Metal organic framework; Bimetallic selenides; Sodium ion battery
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2020.146259

ZnSe/CoSe@NPC nanocomposite was prepared by the in-situ selenization of ZIF-8/67 polyhedron. The hollow ZnSe/CoSe@NPC nanocomposite delivers a capacity of 236.4 mAh g−1 at a high rate of 10 A g−1. Our ZnSe/CoSe@NPC nanocomposite electrode exhibits excellent long cyclic life (303.9 mAh g−1 at 1A g−1 for 900 cycles). [Display omitted] •ZnSe/CoSe@NPC was synthesized by the in-situ selenization of ZIF-8/67 polyhedron.•As-prepared ZnSe/CoSe@NPC displays a high capacity 417.6 mAh g−1 for 200 cycles.•Our hollow ZnSe/CoSe@NPC nanocomposite delivers a capacity of 236.4 mAh g−1 at a high rate of 10 A g−1.•ZnSe/CoSe@NPC nanocomposite exhibits excellent long cyclic life (303.9 mAh g−1 at 1A g−1 for 900 cycles).•Kinetic analysis and electrochemical process of ZnSe/CoSe@NPC nanocomposite are studied. Bimetallic selenide (ZnSe / CoSe) was embedded in N-doped carbon rhombic dodecahedron and used as a sodium ion battery (SIB) anode. Metal organic framework (MOF) precursors (ZIF-8 / 67) form hollow structures (denoted as ZnSe/CoSe@NPC)through in situ pyrolysis and selenization processes at specific temperatures. Our selenides have very good electrochemical sodium storage properties. After 200circulation, the capacity of the as-prepared ZnSe/CoSe@NPC nanocomposite electrode was maintained at 417.6 mAh g−1 at 0.1 A g−1. Regarding rate capacity, the capacities of ZnSe/CoSe@NPC nanocomposite electrode are of 460.8, 415.6, 359.9, 346.3, 318.0, 274.1 and 236.4 mAh g−1 at different current densities of 0.1, 0.2, 0.5, 1, 2, 5 and 10 A g−1, respectively. The stability of the ZnSe/CoSe@NPC nanocomposite electrode at high current density is also obtained, and after 900 cycles at a high current density of 1 A g−1, the electrode can maintain a stable reversible capacity of 303.9 mAh g−1. Besides, kinetic analysis of the electrochemical Na+ storage behaviour of the ZnSe/CoSe@NPC nanocomposite shows that the external pseudocapacitor results in excellent rate performance and excellent long-cycle stability. This study proposes a new strategy for synthesizing multi-component hollow structures for the manufacture of intended energy storage devices.