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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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Jinyuan Dong,Silan Chen,Xiaotian Wang,Yuguang Mao,Xiaoxiao Jing,Zhixu Ouyang,Jiabao Ding,Jianjun Tian,Yujin Ji,Youyong Li,Wu-Jun Shi,Yang Han,Weifeng Zhang
Co3Sn2S2 (CSS) possesses robust surface states and high conductivity derived from Co atoms with Weyl points located only 60 meV above the Fermi level (Ef), revealing the probability of tuning the electronic band structure of CSS by doping with transition metal atoms. Here, Fe, Ni, and Cu atoms have been successfully incorporated into CSS, which turns out that the Fe0.1–CSS possesses better activity than CSS and IrO2 with an overpotential of 298 mV to reach the current density of 10 mA cm–2 and a Tafel slope of 358.3 mV dec–1 in 1 M KOH. The Fe0.1–CSS also shows better activity and stability than IrO2 as an anode for the anion exchange membrane water electrolyzer in 1 M KOH. Besides, the density functional theory results indicate that the band structure of CSS is adjusted by the incorporation of transition metal atoms, which is related to the regulation of Ef and thus the variation in electrolytic performance. Our findings provide a strategy to further engineer the activity of a topological semimetal, which provides a direction toward material design for catalysis and beyond.
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DOI
PubMed
高影响因子
Sustainable Energy & Fuels
·
2025
·Vol. 9
·期 19
·5269-5277
·
IF 4.1
Xinyue Zhang,Fulei Liu,Jiachang Zhao,Jun Jin
Because of their great capacity to store lithium, cobalt-based phosphides are utilized as anode materials for lithium-ion batteries (LIBs). However, in practice, they are prone to capacity fading and volume expansion, which restrict their long-term use. Herein, a simple method was proposed to prepare CoP nanoparticles encapsulated in a Co-MOF-71 derived carbon layer (CoP/C). The carbon in the composites greatly improved the cycling stability and rate capability of CoP/C when compared with pure CoP. CoP/C exhibits a high initial discharge capacity of 823 mA h g−1, a cycling durability of 338 mA h g−1 over 100 cycles, a good initial coulombic efficiency of ca. 76%, and an excellent rate capability (1 A g−1: 318 mA h g−1 and 2 A g−1: 284 mA h g−1).
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Zhi-Rong Fu,Xin Zhang,Jing-Yuan Hao,Yu Han,Yu-Wei Xiang,Bao-Ju Wang,Xiang-Sen Wu,Yong Luo
The Co/NC catalyst for the hydrogenation of adiponitrile (ADN) is of great importance to produce high-value-added hexamethylenediamine (HMDA), which is the raw material for nylon-66. However, current research has not taken the Co particle size distribution effect fully into account for the ADN hydrogenation performance. In this work, Co/NC catalysts with various Co particle sizes using N-doped carbon as the support were prepared to investigate their activity differences. Among all catalysts, the Co/NC catalyst with an average Co particle size of 13.3 nm exhibited the best performance due to its most dispersed Co0 active site, reaching a complete ADN conversion within 40 min with an HMDA selectivity of 83.68%. It displayed a surprising HMDA STY of 49.77 mmol·gcat–1·h–1 under a greatly reduced activation energy (65.30 kJ·mol–1) with a reaction rate constant of 2.98 × 107 min–1. XPS and H2 pulse adsorption characterizations proved that the synergy between the Co0 content and dispersion emerged as the predominant factor governing the catalytic activity. This work provided a promising method for the design of an advanced catalyst for ADN hydrogenation.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Lu Wen,Chaojie Li,Houqun Xiao,Huazhou Hu,Chaobin Lai,Luocai Yi,Qingjun Chen
The ZrCo alloy stands out as one of the most promising candidates for hydrogen isotope storage materials in nuclear fusion, owing to its extremely low equilibrium hydrogen pressure (10 −3 Pa, 20 ℃). However, ZrCo experiences severe disproportionation reactions during dehydrogenation/hydrogenation processes, which lead to significant performance degradation. To address this, we have introduced V and Ti into the ZrCo alloy, resulting in the Zr 0.8 V x Ti 0.2-x Co (x = 0–0.15) series. Our research indicates that the addition of V and Ti reduces the lattice parameters, thereby increasing the platform pressure for hydrogen desorption and decreasing the enthalpy and entropy of the desorption reaction. This modification allows for a lower desorption temperature and enhances the alloy's resistance to hydrogen-induced degradation. Remarkably, the hydrogen storage capacity of the Zr 0.8 V x Ti 0.2-x Co(x = 0–0.15) alloys remains stable after 19 h of desorption. Furthermore, the Zr 0.8 V 0.05 Ti 0.15 Co alloy demonstrates exceptional cycling stability, retaining over 99 % of its hydrogen storage capacity after 50 cycles. First-principles calculations have clarified the adsorption energies of hydrogen at different binding sites, revealing the following order of stability: E b(Ti-V) < E b(Zr-Ti) < E b(V-Zr) < E b(Zr-Zr) . The hydrogen absorption and desorption kinetics of the Zr 0.8 V x Ti 0.2-x Co alloys follow the trend: Zr 0.8 V 0.15 Ti 0.05 Co > Zr 0.8 V 0.1 Ti 0.1 Co > Zr 0.8 V 0.05 Ti 0.15 Co > ZrCo, indicating optimized performance with the introduction of V and Ti. This study not only provides a viable solution to the disproportionation issue in ZrCo alloys but also offers valuable insights into the design of high-performance hydrogen isotope storage materials for nuclear fusion applications.
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