Synthesis of MnSe @C yolk‐shell nanospheres via a water vapor‐assisted strategy for use as anode in sodium‐ion batteries

Abstract

Summary This study introduces a simple and eco‐friendly synthetic strategy for yolk‐shell nanospheres that consist of manganese selenide yolks and carbon shells (MnSe@C) by reacting manganese salt impregnated in the porous hollow carbon nanospheres (HCNS) with H2O vapor. First, manganese salt dissolved in ethanol was impregnated into the spacious pores of the HCNS by capillary force. Then, heat treatment of the powder in the presence of H2O triggered the nucleation and crystal growth of manganese hydroxide, resulting in the formation of HCNS whose central voids are filled with multiple nanoparticles. Subsequent selenization yielded yolk‐shell nanospheres with MnSe@void@carbon configuration. MnSe@C was applied as the anode for sodium‐ion batteries (SIBs), and the following electrochemical reaction was confirmed from various analytical techniques: MnSe +2Na+ + 2e− ↔ Mn + Na2Se. MnSe@C nanospheres exhibited stable cycle performance up to 1000 cycles at 0.5 A g−1, wherein a reversible capacity of 222 mA h g−1 was delivered in the 1000th cycle. Furthermore, MnSe@C nanospheres exhibited a fair rate performance (209 mA h g−1 at 2.0 A g−1).

A core@double‐shell structured silicon/ flower‐like manganese selenide/carbon composite as superior dual anode materials of Li/Na‐ion batteries

“…In order to enhance the electrochemical performance of MnSe based composite, the conventional method is to compound with carbon material. However, when composite with carbon material, the form of MnSe in the product is mostly nanoparticles 17,37,44,54‐57 . Because the particle size is small and evenly dispersed on the matrix of carbon material, the electrochemical performance is significantly improved.…”

“…However, when composite with carbon material, the form of MnSe in the product is mostly nanoparticles. 17,37,44,[54][55][56][57] Because the particle size is small and evenly dispersed on the matrix of carbon material, the electrochemical performance is significantly improved. Only two kinds of materials achieve the special morphology of coaxial double nanotubes 38 or nanoboxes 58 supported by their own templates.…”

Developing High‐Performance Metal Selenides for Sodium‐Ion Batteries

“…This sodiumstorage mechanism of intercalation-conversion metal selenides has been demonstrated by various research groups. [38][39][40][41][42][43][44][45][46] For example, Yi and co-workers analyzed the phase evaluation process of layered VSe 2 during the first cycle by in situ X-ray diffraction (XRD) and ex situ high-resolution transmission electron microscope (HRTEM). [47] As shown in Figure 2a, the characteristic peaks of NaVSe 2 and Na 0.6 VSe 2 are detected at the preliminary stage of Na + intercalation.…”

Polypyrrole Modified MoS2 Nanorod Composites as Durable Pseudocapacitive Anode Materials for Sodium-Ion Batteries

“…Recently, two-dimensional layered metal chalcogenides have attracted extensive attention. Park et al synthesized a variety of metal sulfides/selenides and achieved excellent performance in sodium-ion batteries [6][7][8]. Metal sulfides have good conductivity and large layer spacing, so they possess high theoretical capacities [9][10][11].…”