Small
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2024
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IF 13
Xinyu Wang,Lei Yang,Huanyu Liang,Chunliu Zhu,Jing Shi,Jingyi Wu,Jingwei Chen,Weiqian Tian,Yue Zhu,Huanlei Wang
The poor cycling stability and rate performance of transition metal selenides (TMSs) are caused by their intrinsic low conductivity and poor structural stability, which hinders their application in potassium-ion batteries (PIBs). To address this issue, encapsulating TMSs within carbon nanoshells is considered a viable strategy. However, due to the lack and uncontrollability of internal void space, this structure cannot effectively mitigate the volume expansion induced by large K + , resulting in unsatisfactory electrochemical performance. Herein, peanut-shaped FeSe 2 @carbon yolk-shell capsules are prepared by modulation of the internal space. The active FeSe 2 is encapsulated within a robust carbon shell and an optimal void space is retained between them. The outer carbon shell promotes electronic conductivity and avoids FeSe 2 aggregation, while the internal void mitigates volume expansion and effectively ensures the structural integrity of the electrode. Consequently, the FeSe 2 @carbon anode demonstrates exceptional rate performance (242 mAh g −1 at 10 A g −1 ) and long cycling stability (350 mAh g −1 after 500 cycles at 1 A g −1 ). Furthermore, the effect of internal space modulation on electrochemical properties is elucidated. Meanwhile, ex situ characterizations elucidate the K + storage mechanism. This work provides effective guidance for the design and the internal space modulation of advanced TMSs yolk-shell structures.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
VACUUM
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2025
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IF 3.9
Jiajia Ye,Zizhong Chen,Zifan Wang,Li Han,Mingyuan Pang,Zhen Kong,Juan An,Zheng Li,Guang Xia
P-doped CoSe 2 /FeSe 2 heterojunction nanoparticles (2–10 nm) anchored on a three-dimensional porous foam-like carbon network were synthesized via a direct pyrolysis-blowing strategy followed by phosphorization/selenization process. This carbon network serves as a continuous pathway for electron conduction, enhances specific surface area, and alleviates electrode volume expansion during cycling. Specifically, P-doping further improves the electrical conductivity of CoSe 2 /FeSe 2 nanoparticles, significantly accelerating electrochemical kinetics and enabling high specific capacities at elevated current densities. Benefiting from the unique nanostructure and atomic-level P-doping, the P-CoSe 2 /FeSe 2 (2:1)/C anode delivers prominent cycling stability (210.9 mAh g −1 after 2000 cycles at 2000 mA g −1 ) and exceptional rate capability (323.5 mAh g −1 at 5000 mA g −1 ). This work demonstrates that combining heterojunction engineering with heteroatom doping is an effective strategy to enhance the long-term cycling stability of sodium-ion battery anodes.
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产品关联
DOI
高影响因子
Nano Today
·
2021
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IF 20.722
Shaojun Peng,Hao Wang,Yongjie Xin,Wei Zhao,Meixiao Zhan,Jingchao Li,Rong Cai,Ligong Lu
Hydrogen selenide (H 2 Se) plays key roles in diverse physiological processes ; however, the noninvasive regulation of H 2 Se levels in living systems has been rarely achieved and the functional mechanism of H 2 Se in cancer cells remains unclear. Herein, biocompatible ferrous selenide (FeSe 2 ) nanoflowers with second near-infrared (NIR-Ⅱ) photoactivatable H 2 Se generation were developed for metastasis-inhibited cancer therapy. Upon NIR-II laser irradiation, FeSe 2 nanoflowers generated mild photothermal effect, leading to their decomposition and on-demand release of H 2 Se to induce cell death. Such a FeSe 2 nanoflower-mediated synergistic photothermal-H 2 Se gas therapy effectively suppressed the tumor growth in a subcutaneous breast tumor-bearing mouse model. Furthermore, the local generation of H 2 Se was proved to down-regulate the expression levels of metastasis-related proteins, contributing to the complete inhibition of liver and lung metastasis. Overall, we report a NIR-Ⅱ photoactivatable H 2 Se production strategy for metastasis-inhibiting cancer therapy, which may be mediated by autophagy, opening a new avenue for the biomedical application of H 2 Se in the future.
研究领域:
生物医学工程
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癌症生物学
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纳米技术
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光疗
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2021
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IF 9.229
Jian Feng,Shao-hua Luo,Yang Zhan,Sheng-xue Yan,Peng-wei Li,Lin Zhang,Qing Wang,Ya-hui Zhang,Xin Liu
Thanks to their high conductivity and theoretical capacity, transition metal selenides have demanded significant research attention as prospective anodes for sodium-ion batteries. Nevertheless, their practical applications are hindered by finite cycle life and inferior rate performance because of large volume expansion, polyselenide dissolution, and sluggish dynamics. Herein, the nitrogen-doped carbon (NC)-coated FeSe2 nanoparticles encapsulated in NC nanoboxes (termed FeSe2@NDC NBs) are fabricated through the facile thermal selenization of polydopamine-wrapped Prussian blue precursors. In this composite, the existing nitrogen-doped dual carbon layer improves the intrinsic conductivity and structural integrity, while the unique porous yolk–shell architecture significantly mitigates the volume swelling during the sodium/desodium process. Moreover, the derived Fe–N–C bonds can effectively capture polyselenide, as well as promote Na+ transportation and good reversible conversion reaction. As expected, the FeSe2@NDC NBs deliver remarkable rate performance (374.9 mA h g–1 at 10.0 A g–1) and long-cycling stability (403.3 mA h g–1 over 2000 loops at 5.0 A g–1). When further coupled with a self-made Na3V2(PO4)3@C cathode in sodium-ion full cells, FeSe2@NDC NBs also exhibit considerably high and stable sodium-storage performance.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
PubMed
高影响因子
BIOMATERIALS
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2024
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IF 12.8
Fan Yang,Rui Shu,Wenyu Dai,Bin Li,Chuang Liu,Hang Yang,Hannah M. Johnson,Sheng Yu,Ding Bai,Weizhong Yang,Yi Deng
Pathogenic infection leads to excessive senescent cell accumulation and stagnation of wound healing. To address these issues, we devise and develop a hydrogen selenide (H 2 Se)-evolving bio-heterojunction (bio-HJ) composed of graphene oxide (GO) and FeSe 2 to deracinate bacterial infection, suppress cellular senescence and remedy recalcitrant infected wounds. Excited by near-infrared (NIR) laser, the bio-HJ exerts desired photothermal and photodynamic effects, resulting in rapid disinfection. The crafted bio-HJ could also evolve gaseous H 2 Se to inhibit cellular senescence and dampen inflammation. Mechanism studies reveal the anti-senescence effects of H 2 Se-evolving bio-HJ are mediated by selenium pathway and glutathione peroxidase 1 (GPX1). More critically, in vivo experiments authenticate that the H 2 Se-evolving bio-HJ could inhibit cellular senescence and potentiate wound regeneration in rats. As envisioned, our work not only furnishes the novel gasotransmitter-delivering bio-HJ for chronic infected wounds, but also gets insight into the development of anti-senescence biomaterials.
研究领域:
生物材料
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伤口愈合
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生物医学工程
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细胞生物学
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药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）