A General Metal‐Organic Framework (MOF)‐Derived Selenidation Strategy for In Situ Carbon‐Encapsulated Metal Selenides as High‐Rate Anodes for Na‐Ion Batteries

Abstract

On account of increasing demand for energy storage devices, sodium‐ion batteries (SIBs) with abundant reserve, low cost, and similar electrochemical properties have the potential to partly replace the commercial lithium‐ion batteries. In this study, a facile metal‐organic framework (MOF)‐derived selenidation strategy to synthesize in situ carbon‐encapsulated selenides as superior anode for SIBs is rationally designed. These selenides with particular micro‐ and nanostructured features deliver ultrastable cycling performance at high charge–discharge rate and demonstrate ultraexcellent rate capability. For example, the uniform peapod‐like Fe7Se8@C nanorods represent a high specific capacity of 218 mAh g−1 after 500 cycles at 3 A g−1 and the porous NiSe@C spheres display a high specific capacity of 160 mAh g−1 after 2000 cycles at 3 A g−1. The current simple MOF‐derived method could be a promising strategy for boosting the development of new functional inorganic materials for energy storage, catalysis, and sensors.

TiO2‐Coated Interlayer‐Expanded MoSe2/Phosphorus‐Doped Carbon Nanospheres for Ultrafast and Ultralong Cycling Sodium Storage

“…As displayed in Figure 5A, all the CV curves have similar peak shapes except for the corresponding shift during Na + insertion/extraction processes. [11,49,50] As shown in Figure 5C, 86.2% of the total capacity is attributed to the capacitive contribution at a scan rate of MoSe 2 /P-C electrode ( Figure S7A, Supporting Information) and the decreasing charge-transfer resistance upon cycling ( Figure S7B, Supporting Information). Generally, b = 0.5 indicates a diffusion-controlled process, and b = 1.0 represents capacitive-contributed charge storage.…”

“…Compared with CV curves of the MoSe 2 /P-C and TiO 2 ( Figure S5, Supporting Information), the peak at 1.53 V corresponds to the Na + intercalation into anatase TiO 2 phase. [23,49] Accordingly, the oxidation peaks at 1.67 and 2.10 V are associated with the oxidation of Mo to MoSe 2 and Na x TiO 2 to TiO 2 , respectively. [23,49] Accordingly, the oxidation peaks at 1.67 and 2.10 V are associated with the oxidation of Mo to MoSe 2 and Na x TiO 2 to TiO 2 , respectively.…”

Hierarchical Hollow‐Microsphere Metal–Selenide@Carbon Composites with Rational Surface Engineering for Advanced Sodium Storage

“…[60] In addition, the obvious phase platforms of NiSe 2 /N-C at 0.5-1.0 V were detected, revealing that the existing NiOC bonds supplied more ions to participate in the redox reaction at certain rate. Through the comparison of rate capabilities of previous reports as displayed in Figure 5f, [7,[61][62][63][64][65] it is clear that the functionalized NiSe 2 /N-C showed the considerable rate properties, perhaps originated from the significant designed architecture with carbon layer and the formation of NiOC bonds. After 100 cycling, in Figure 5c, the comparison of their rate capabilities is presented at stepwise current densities of 0.2, 0.5, 1.0, 2.0, 3.0, 5.0, and 10.0 A g −1 , respectively.…”

FeP@C Nanotube Arrays Grown on Carbon Fabric as a Low Potential and Freestanding Anode for High‐Performance Li‐Ion Batteries

“…With the daily‐increasing pressure of limited fossil resources and environmental problems, one of the most feasible ways to alleviate these issues is to develop high efficiency energy storage device that exhibit high energy densities, long lifespans, and environmental friendliness . In recent decades, lithium‐ion batteries (LIBs) with a relatively high energy density and long cycle life have dominated the commercial energy storage market.…”