Embedding α-MnSe nanodots in nitrogen-doped electrospinning carbon nanofibers to enhanced storage properties of lithium-ion batteries

Lee

Intl J of Energy Research

et al. 2021

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).

Section: Resultsmentioning

confidence: 61%

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

Lee

Intl J of Energy Research

et al. 2021

“…Due to the p‐type semiconductor characteristics of MnSe (Figure 4c) [ 32,54 ] and n‐type semiconductor characteristics of WS 2 , [ 55 ] MnSe/WS 2 vertical heterojunctions can form p–n heterojunction naturally. We further fabricated MnSe/WS 2 vertical heterojunctions via a two‐step CVD method to study the electronic and optoelectronic properties of the MnSe/WS 2 p–n diode (Figure S10, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Ultrathin 2D Nonlayered α‐MnSe Nanosheets, MnSe/WS₂ Heterojunction for High‐Performance Photodetectors

et al. 2021

Numerous efforts have been made to synthesize 2D atomic semiconductor materials and their heterojunctions because of the diverse novel properties and potential applications in constructing next‐generation highly compact electronic and optoelectronic devices. However, intrinsic 2D p‐type semiconductor materials are still scarce. Herein, to enrich the p‐type 2D semiconductor family, epitaxial growth of a large‐area, ultrathin 2D nonlayered p‐type semiconductor α‐MnSe on mica with the thickness down to one unit crystal cell (0.9 nm) is reported. Moreover, the thickness of the α‐MnSe nanosheets can be systematically tailored from over 150 to 0.9 nm by increasing the flow rate of the carrier gas. X‐ray‐diffraction, transmission electron microscopy, and electron diffraction studies confirm that the resulting 2D nanosheets are high‐quality single crystals. The photodetector based on the p‐type α‐MnSe nanosheet shows a fast response time of 4 ms. Furthermore, α‐MnSe/WS2 heterojunctions are synthesized and a diode based on p‐type α‐MnSe and n‐type WS2 displays outstanding photodetectivity (1.00 × 1013 Jones), high photoresponsivity (49.1 A W−1), and an obvious rectification ratio (283). Together, the synthesis of α‐MnSe and the α‐MnSe/WS2 p–n heterojunction provides opportunities for next‐generation electronics and optoelectronics.

“…The value of b of ZnSe@N-CNFs anode in LIBs and SIBs is calculated and showing in Figure 6B,F, respectively. The value of b in each peak is between 0.5 to 1, which can be considered that the ion storage process of ZnSe@N-CNFs anode is controlled by both capacitive and diffusion (Zhou et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Electrochemical Performance of ZnSe Electrospinning Nanofibers as an Anode Material for Lithium Ion and Sodium Ion Batteries

et al. 2019

Self Cite

ZnSe nitrogen-doped carbon composite nanofibers (ZnSe@N-CNFs) were derived as anode materials from selenization of electrospinning nanofibers. Electron microscopy shows that ZnSe nanoparticles are distributed in electrospinning nanofibers after selenization. Electrochemistry tests were carried out and the results show the one-dimensional carbon composite nanofibers reveal a great structural stability and electrochemistry performance by the enhanced synergistic effect with ZnSe. Even at a current density of 2 A g −1 , the as-prepared electrodes can still reach up to 701.7 mA h g −1 after 600 cycles in lithium-ion batteries and 368.9 mA h g −1 after 200 cycles in sodium-ion batteries, respectively. ZnSe@N-CNFs with long cycle life and high capacity at high current density implies its promising future for the next generation application of energy storage.