Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-20
·
IF 36.3
Liang Puwu,Pan Duo,Hu Xiang,Yang Ke R.,Liu Yangjie,Huo Zijing,Bo Zheng,Xu Lihong,Xu Junhua,Wen Zhenhai
Manganese-based chalcogenides have significant potential as anodes for sodium-ion batteries (SIBs) due to their high theoretical specific capacity, abundant natural reserves, and environmental friendliness. However, their application is hindered by poor cycling stability, resulting from severe volume changes during cycling and slow reaction kinetics due to their complex crystal structure. Here, an efficient and straightforward strategy was employed to in-situ encapsulate single-phase porous nanocubic MnS 0.5 Se 0.5 into carbon nanofibers using electrospinning and the hard template method, thus forming a necklace-like porous MnS 0.5 Se 0.5 -carbon nanofiber composite (MnS 0.5 Se 0.5 @N-CNF). The introduction of Se significantly impacts both the composition and microstructure of MnS 0.5 Se 0.5 , including lattice distortion that generates additional defects, optimization of chemical bonds, and a nano-spatially confined design. In situ/ex-situ characterization and density functional theory calculations verified that this MnS 0.5 Se 0.5 @N-CNF alleviates the volume expansion and facilitates the transfer of Na + /electron. As expected, MnS 0.5 Se 0.5 @N-CNF anode demonstrates excellent sodium storage performance, characterized by high initial Coulombic efficiency (90.8%), high-rate capability (370.5 mAh g −1 at 10 A g −1 ) and long durability (over 5000 cycles at 5 A g −1 ). The MnS 0.5 Se 0.5 @N-CNF //NVP@C full cell, assembled with MnS 0.5 Se 0.5 @N-CNF as anode and Na 3 V 2 (PO 4 ) 3 @C as cathode, exhibits a high energy density of 254 Wh kg −1 can be provided. This work presents a novel strategy to optimize the design of anode materials through structural engineering and Se substitution, while also elucidating the underlying reaction mechanisms.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Zequan Jiang,Xiaoqi Peng,Shuwei Sheng,Yawu He,Yuchen Li,Junjie Yang,Jianyu Li,Yue Hu,Changfei Zhu,Tao Chen,Hong Wang
Antimony selenosulfide, Sb2(S,Se)3, materials have emerged as a prominent research hotspot in energy and optoelectronics fields, owing to their tunable band gap, excellent stability and one-dimensional crystal structures. Sb2(S,Se)3 solar cell devices usually adopt layered device structure where the hole transport layers (HTLs) play critical roles in affecting the device efficiency, operational stability, and charge carrier transport capabilities. Despite considerable advances in Sb2(S,Se)3 photovoltaics, their development remains constrained by an efficiency-stability trade-off primarily stemming from interfacial defects and thermal degradation of conventional HTLs such as Spiro-OMeTAD, which exhibit rapid performance decay under ambient conditions. Herein, methylammonium lead bromide (MAPbBr3) films are strategically designed as HTLs, leveraging their covalent Pb-S(Se) and Sb-Br interfacial bonds with Sb2(S,Se)3 to enhance charge extraction efficiency and passivate interfacial defects. Ultraviolet photoelectron spectroscopy (UPS) analysis reveals a cliff-like band alignment at the Sb2(S,Se)3/MAPbBr3 heterojunction interface, which effectively suppresses interfacial electron recombination. Furthermore, we demonstrate a record power conversion efficiency (PCE) of 9.37% in optimized solar cells, which represents the highest reported value for antimony chalcogenides/perovskite heterojunction solar cells. This study proposes a class of perovskite based HTLs that enables efficient interfacial band alignment, establishing a new paradigm for interface engineering in high-performance photovoltaic devices.
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DALTON TRANSACTIONS
·
2025
·
IF 3.3
Jun Cao,Chengsheng Wang,Zechao Xu,Kelan Yan,Liming Shen,Zheng Huang,Lingjie Zhang,Runhua Fan,Ningzhong Bao
Metamaterials exhibiting simultaneous negative permittivity (ε < 0) and negative permeability (μ < 0) offer exceptional electromagnetic properties, enabling advanced applications such as subwavelength imaging, wireless power transfer, and advanced antenna systems. Chromium-based selenium spinel composites have emerged as promising candidates for random double-negative metamaterials (DNMs), although achieving tunable and desired double-negative characteristics remains challenging. Here, CoCr2Se4, distinguished by high magnetic spin resonance in high-frequency fields and low conductivity, was selected to modulate the electromagnetic properties of CuCr2Se4-based composites. A series of (1 − x)CuCr2Se4·xCoCr2Se4 samples were synthesized via a solid-state reaction. Double-negative properties were achieved in the MHz frequency ranges, specifically within 841–1000 MHz for x = 0.2, 638–1000 MHz for x = 0.4, and 484–1000 MHz for x = 0.6. The negative permittivity arises from the plasma oscillations of delocalized carriers, well described by the Drude model. Meanwhile, negative permeability is explained through the suppression of eddy currents–due to the low conductivity of CoCr2Se4-which mitigates skin-depth limitations and enhances magnetic resonance. This composite design not only reduces electromagnetic attenuation but also improves magnetic responsiveness under alternating fields. By clarifying the selection rationale for metallic ferromagnetic spinel composites, this work enhances the theoretical understanding and tuning mechanisms of negative ε and μ. It thereby broadens the scope of metamaterial research and facilitates the development of single-phase double-negative materials, especially for low-frequency near-field applications.
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