Constructing CoO/Co₃S₄ Heterostructures Embedded in N‐doped Carbon Frameworks for High‐Performance Sodium‐Ion Batteries

Abstract

Heterostructures are attractive for advanced energy storage devices due to their rapid charge transfer kinetics, which is of benefit to the rate performance. The rational and facile construction of heterostructures with satisfactory electrochemical performance, however, is still a great challenge. Herein, ultrafine hetero-CoO/Co 3 S 4 nanoparticles embedded in N-doped carbon frameworks (CoO/Co 3 S 4 @N-C) are successfully obtained by employing metal-organic frameworks as precursors. As anodes for sodium ion batteries, the CoO/Co 3 S 4 @N-C electrodes exhibit high specific capacity (1029.5 mA h g −1 at 100 mA g −1 ) and excellent rate capability (428.0 mA h g −1 at 5 A g −1 ), which may be attributed to their enhanced electric conductivity, facilitated Na + transport, and intrinsic structural stability. Density functional theoretical calculations further confirm that the constructed heterostructures induce electric fields and promote fast reaction kinetics in Na + transport. This work provides a feasible approach to construct metal oxide/sulfide heterostructures toward high-performance metal-ion batteries.

Boosting Transport Kinetics of Cobalt Sulfides Yolk–Shell Spheres by Anion Doping for Advanced Lithium and Sodium Storage

“…Recently, transition-metal sulfides (TMSs) have been widely used as anode materials in LIBs and SIBs owing to their excellent electronic conductivity, high theoretical capacity, and abundant redox chemical properties. [8,13,[15][16][17][18] Among them, Co and S can be combined to form various forms of compounds with different valence states such as CoS, [19][20][21] CoS 2 , [22][23][24] Co 3 S 4 , [13,25,26] Co 9 S 8 , [27][28][29] and others, which endows them as potential anode materials with high theoretical specific capacity and superior thermal stability. However, the issues of rapid capacity decay, poor reaction kinetics, and severe polarization owing to volume changes during electrochemical reactions are still huge challenges for cobalt sulfides in practical applications.…”

Stabilising Cobalt Sulphide Nanocapsules with Nitrogen-Doped Carbon for High-Performance Sodium-Ion Storage

“…Transition metal chalcogenides (TMCs) with high charge storage capacity, suitable redox voltage, and good electron conductivity have advantages compared to their oxide counterparts [1][2][3]. Among various TMCs, cobalt sulphides hold a great potential as anode materials for highperformance NIBs due to their high theoretical capacities, relatively low voltage plateau, and low cost [4][5][6]. Unfortunately, this family of materials suffers from sluggish kinetics of sodium-ion transport and large volume changes during charge/discharge, causing problems such as severe pulverisation and unstable solid electrolyte interphase (SEI) films [7].…”

Bimetal‐organic Framework‐derived Co9S8/ZnS@NC Heterostructures for Superior Lithium‐ion Storage

“…So far, many strategies including downsizing the particle size to fabricate hierarchical nanostructures, constructing composites with conductive carbon matrix, and integration with heterogeneous hybrids to shorten electronic and ionic transport paths, alleviate the internal strain, improve the electrical conductivity, and accommodate the volume changes during cycling, have been devoted to promote the lithium storage performance of metal sulfides. Among these effective approaches, construction of heterostructures consisted of different components with bandgaps difference, is an effective way to promote the electrochemical performance, which could generate a strong built‐in electric field ( E ‐field), promote interface charge transport of ions and electrons, thus improving the reaction kinetics .…”