Metal-organic framework derived bimetallic selenide embedded in nitrogen-doped carbon hierarchical nanosphere for highly reversible sodium-ion storage

Bowen Cong; Xianrong Li; Yanhua Suo; Gang Chen

doi:10.1016/j.jcis.2022.12.153

Metal-organic framework derived bimetallic selenide embedded in nitrogen-doped carbon hierarchical nanosphere for highly reversible sodium-ion storage

J Colloid Interface Sci. 2023 Apr:635:370-378. doi: 10.1016/j.jcis.2022.12.153. Epub 2022 Dec 29.

Authors

Bowen Cong¹, Xianrong Li¹, Yanhua Suo², Gang Chen³

Affiliations

¹ MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.
² College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing 163318, China. Electronic address: 33367123@qq.com.
³ MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China. Electronic address: gchen@hit.edu.cn.

PMID: 36599236
DOI: 10.1016/j.jcis.2022.12.153

Abstract

Bimetallic selenides with various valence transitions and high theoretical capacities are extensively studied as anodes for sodium-ion-batteries (SIBs), but their huge volume changes and poor capacity retention limit their practicality. Herein, a facile and controllable strategy using a binary Ni-Co metal-organic framework (MOF) precursors followed by the selenization process, which produced a cobalt nickel selenide/N-doped carbon composite ((CoNi)Se₂/NC) that maintained the hierarchical nanospheres structure. Such a distinctive structure affords both Na⁺ and electron diffusion pathways in the electrochemical reactions as well as high electrical conductivity, thus leading to superior electrochemical performance when the designed composite is utilized as an anode in SIBs. The resulting nanospheres-like (CoNi)Se₂/NC hierarchical structure exhibits a high specific capacity of 526.8 mA h g^-1 at 0.2 A/g over 100 cycles, a stable cycle life with no obvious capacities loss at 1.0 and 3.0 A/g after 500 cycles, and exceptional rate capability of 322.9 mA h g^-1 at 10.0 A/g.

Keywords: Hierarchical structure; Metal–organic framework; N-doped carbon; Selenides; Sodium-ion-batteries.