CARBON
·
2026
·
IF 12.7
Yanjun Jiang,Shuai Lv,Baoshan Li,Zihao Zhao,Xinyu Wang,Junjie Fu,Jingyu Wang,Yangzhaohua Sun,Yiming Liu,Dongdong Lv,Yanan Yang,Long Xia
To address the insufficient broadband coverage of conventional microwave absorbing materials, a high-performance absorber is developed through a synergistic strategy integrating microscopic component regulation and macroscopic structural design. Sn particles are uniformly anchored onto graphene oxide (GO) using cetyltrimethylammonium bromide (CTAB) as a charge mediator, constructing pod-like bionic micro-absorbing units. Subsequent heat treatment under an inert atmosphere induces the in-situ formation of a GO@Sn/SnO 2 multi-heterolayer structure. The optimized SG-3 sample exhibits a minimum reflection loss of −59.22 dB and a maximum effective absorption bandwidth of 5.49 GHz. To overcome the bandwidth limits of planar absorbers, a turtle shell-inspired metamaterial superstructure was designed to strengthen multi-reflection and structural resonance. Combining the optimized material with this bio-inspired structure, the composite absorber breaks the bandwidth constraints of the Planck-Rozanov limit and realizes 16 GHz broadband absorption in 2-18 GHz. At r1 = r2 = 6 mm, h1 = 8 mm, h2 = 12 mm, the absorber exhibits a 14.56 GHz effective bandwidth with strong absorption peaks in the S, C, X, and Ku bands, and a maximum reflection loss of −52.88 dB. This work provides a feasible strategy for high-performance broadband microwave absorbers.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Yiling Quan,Xiwen Xia,Peifeng Feng,Wanru Lin,Xuedong Wu,Mingguang Zhang,Kun Liang,Yujie Song,Xigao Jian,Jian Xu
To improve the conductivity and porosity of polymer derived SiOC ceramics, we incorporated graphite into the Sn-containing SiOC precursor (SG), thereby constructing multiscale porous architectures. The introduction of graphite has a dual effect. Firstly, it stabilizes the foam structure of the polymer, and secondly, it acts as a carbon source, promoting the carbothermal reduction of Sn oxide, releasing more gas, and leading to the formation of micropores. As a result, the specific surface area increases from 31 m 2 g -1 to 68 m 2 g -1 . The excellent electrical conductivity of graphite and the more stable porous structure brought by the introduction of graphite enhanced the electrochemical performance of the material as an anode, enabling SG to exhibit a high specific capacity of 412.3 mA h g -1 at 1 A g -1 while maintaining an outstanding rate performance. Moreover, the material retains a capacity of 341.3 mA h g -1 even after enduring 1000 cycles at a current density of 1 A g -1 , demonstrating remarkable cycling stability. The integration of polymer-derived SiOC ceramics with graphite to construct a multi-scale porous strategy paves the way for the practical use of advanced lithium-ion batteries.
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CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 22
·36739-36745
·
IF 5.6
Peilin Qing,Ning Guan,Yang Yang,Huizi Qiu,Weishuang Fang,Huaicheng Xiang,Ying Tang,Jie Li,Liang Fang
Crystal structure refinement and Raman spectroscopy were performed on Ca 3 M 2 Ga 2 GeO 12 (M = Ti, Sn, Zr) garnet-structured ceramics to explore the relationships between crystal structure, phonon modes, and microwave dielectric properties . The Ca 3 Ti 2 Ga 2 GeO 12 , Ca 3 Sn 2 Ga 2 GeO 12 , and Ca 3 Zr 2 Ga 2 GeO 12 ceramics were obtained by sintering at 1325–1475 °C for 6 h, and good microwave dielectric properties were achieved: ε r = 15.04, 9.53, and 11.89; Q × f = 59,515 GHz, 49,355 GHz, and 45,587 GHz; and τ f = −47.3 ppm/°C, −52.3 ppm/°C, and −43.0 ppm/°C, respectively. M 4+ (M = Ti, Sn, Zr) cations entirely occupied the octahedral site, leading to an average underbonding between cations and anions, a weak rattling effect, and measured ε r values deviating from theoretical values. The packing fraction and Raman FWHM (A 1g mode) correlated highly with the Q × f values. The negative τ f values were derived from the large positive temperature coefficient of permittivity ( τ ε ) and the temperature coefficient of ionic polarizability ( τ αm ).
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 8
·1-9
·
IF 2.8
Peng Yanyan,Jiang Dayong,Zhao Man
The recent trend of combining perovskite with other materials to enhance optoelectronic performance has garnered significant interest. In this paper, MAPb 0.9 Sn 0.1 I 3 and ZnO–MAPb 0.9 Sn 0.1 I 3 photodetector were prepared by frequency magnetron sputtering and sol–gel spin-coating method. Hybrid heterojunction photodetectors have more beneficial optoelectronic performance compared to MAPb 0.9 Sn 0.1 I 3 photodetector, due to the presence of built-in electric fields, which can suppress the recombination of electrons and holes. At 7 V bias conditions, the responsivities of MAPb 0.9 Sn 0.1 I 3 photodetector were 0.022 and 0.015 A/W, and the responsivities of ZnO–MAPb 0.9 Sn 0.1 I 3 photodetector were 0.39 and 0.99 A/W obtained under 350 and 850 nm illumination, respectively. The maximum external quantum efficiency reaches 144.47%, the detection rate was 5.53 × 10 11 Jones and the light to dark ratio was 2.95 × 10 3 of ZnO–MAPb 0.9 Sn 0.1 I 3 photodetector. This study provides a basis for the preparation of perovskite heterojunction photodetectors with high optoelectronic performance. High performance UV–vis–NIR photodetectors based on ZnO/organic–inorganic hybrid Sn–Pb hybrid perovskite heterojunction.
研究领域:
材料科学
·
光电子学
·
半导体物理
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2022
·Vol. 2022
·期 16
·e202200130
·
IF 2.551
Shengqiang Zhou,Lipeng Zhou,Yunlai Su,Xiaomei Yang,Hao He
Graphical Sn-Beta was synthesized by a quasi-solid-phase method without adding additional solvent. Low amount of template and mineralizer was used as compared with traditional route. Sn-Beta zeolites were successfully synthesized through a quasi-solid-phase method by grinding the raw materials and then crystallizing in solid state. The method employed small amount of tetraethyl ammonium hydroxide (TEAOH) and no additional solvent, except for the water contained in template solution. The synthesis conditions including amount of TEAOH and water, and crystallization time were explored. Under optimized conditions, the obtained sample showed high crystallinity and capped square bipyramidal crystals. The diffuse reflectance ultraviolet-visible spectra and Fourier transform infrared spectra of CD 3 CN and pyridine adsorption were used to characterize the state of Sn and acidity in Sn-Beta sample. Sn 4+ ions were introduced into the framework which generated strong Lewis acid sites. The sample synthesized by quasi-solid-phase method gave 38.5 % methyl lactate (MLA) yield for the conversion of glucose to MLA, which is comparable to that of Sn-Beta prepared with conventional hydrothermal method (39.4 %).
研究领域:
材料科学
·
催化化学
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Hangchao Wang,Xiaomi Shi,Keqiang Ding,Chenxue Li,Yanzhi Sun,Hui Wang,Hongmin Dou,Junqing Pan
A novel finding, that spine-shaped elementary Sn can be prepared by using a constant voltage electrolysis method, was reported for the first time in this communication. The well-defined spine morphology of the prepared sample was evidenced by the SEM image, and the formation of elementary Sn particles with relatively higher crystallinity was documented by the obtained XRD pattern. More importantly, the galvanostatic charge-discharge measurement results indicated that the initial discharge capacity of the prepared sample was as high as 439 mAh g -1 at 100 mA g -1 , and after 20 cycles, the discharge capacity could be maintained at about 101 mAh g -1 under the current density of 100 mA g -1 . Showing the preparation of spine-shaped elementary Sn was the main contribution of this work, which was not only beneficial to the development of anode material of LIBs but also very favorable to the improvement of microelectronic devices.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米材料
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高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Dandan Yang,Jing Shi,Jinhong Shi,Huabin Yang
A silicon/tin@amorphous carbon-graphite (Si/Sn@C-G) composite material was successfully prepared by a simple high energy ball milling and annealing process , exhibiting excellent electrochemical performance in lithium-ion batteries. Structural characterization showed that the phase separated Si/Sn mixture was coated by amorphous carbon and were highly dispersed into the graphitic sheets. As a result, the Si/Sn@C-G composite exhibited a high initial coulombic efficiency of 81.5% and a stable reversible capacity of 612.6 mAh g −1 even after 100 cycles. Cyclic voltammetry and electrochemical impedance spectroscopy results indicated that the Sn acted as an active matrix and could obviously decrease the polarization resistance (Rp). And the ductile Sn could not only cushion the volumetric deformation of Si, but could also improve the Si dispersion. This work demonstrated a facile approach to synthesize highly stable Si/Sn@C-G composite in lithium-ions batteries.
研究领域:
材料科学
·
储能
·
电化学
·
纳米复合材料
·
电池技术
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Advanced Optical Materials
·
2023
·
IF 9
Gaolei Dong,Weichen Li,Lu Zhang,Weixiong Cai,Bobo Yang,Rongrong Hu,Qianqian Zhou,Shiliang Mei,Jun Zou
Cu-based perovskites have excellent optical properties, environmental friendliness, and broad optical applications. However, their development is hindered by complex preparation methods and poor hydrochromic stability. In this work, a solvent-evaporation-based crystallization strategy combined with Sn doping for the preparation of Cs 3 Cu 2 I 5 microcrystals (MCs) is reported. This strategy enhances the photoluminescence quantum yield (PLQY) and hydrochromic reliability. In addition, first-principles calculations reveal the effect of Sn doping on the lattice structure and exciton–phonon coupling of the Cs 3 Cu 2 I 5 MCs. The results show that Sn doping reduces the lattice spacing as a result of the substitution radius difference between Cu + and Sn 2+ ions, which causes stronger exciton–phonon coupling and enhances the PLQY. Moreover, the Sn-doped Cs 3 Cu 2 I 5 MCs show excellent reliability on heating and under hydrochromic cycles and long-term luminescence conditions. Based on their hydrochromic and temperature-responsive properties, the Sn-doped Cs 3 Cu 2 I 5 MCs are applied as encryptable printing materials for information encryption and decryption and as a fluorescence-based temperature sensor, combined with Machine-Learning to guide the manufacturing of fluorescent thermometers. The findings provide insights into the commercial value of copper-based perovskites and demonstrate their potential anti-counterfeiting, fluorescence temperature sensing applications.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Qiuyang Huang,Yicheng Zhao,Yongdan Li
Hematite with a suitable band gap is a promising candidate as the photoanode for photoelectrochemical water splitting, but it suffers from low catalytic activity and severe electron-hole recombination. Herein, a novel two-step solvothermal synthetic strategy is developed to fabricate a uniform CoO x amorphous layer with a thickness of 5 nm on Sn-doped Fe 2 O 3 nanowire photoanode. The CoO x surface layer increases the roughness of the photoanode significantly, and thus enlarges the electrochemical active area. Furthermore, the CoO x layer brings Co 2+ /Co 3+ redox couples, enhances the concentration of oxygen vacancies and increases the charge carrier density. The bulk and surface charge separation efficiencies are both improved. The surface charge transfer process and the oxygen evolution reaction are accelerated. The photocurrent density of the Sn–Fe 2 O 3 photoanode at 1.23 V (vs. reversible hydrogen electrode) is improved from 0.83 to 1.40 mA cm −2 after the deposition of the CoO x surface layer.
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ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Liang Tan,Yijin Wu,Deliang Cheng,Renzong Hu
High-capacity storage in Li-ion batteries with graphite anodes remains a challenge at low temperature. By contrast, metal-based composite anode materials, including Sn metal, have shown good lithium storage capabilities at low temperature. However, the suitable low temperature electrolyte is still infancy to achieve high efficiency capacity of Sn-based anode in ultra-low temperature. Herein, a 2-methytetrahydrofuran (2Me-THF)-based low temperature electrolyte is proven to support the excellent lithium capability of Sn-based anode at ultra-low temperatures. The formulated 2Me-THF electrolyte exhibited small changes in viscosity and ionic conductivity with decreasing temperature. A SnO 2 -LiF-G (graphite) electrode with 1 M lithium bis(trifluoromethanesulfonyl)imide-(2Me-THF) electrolyte maintained 80% of the room temperature reversible capacity at -30°C and delivered a reversible capacity of 650 mAh g −1 , even at -50°C, under a current density of 100 mA g −1 . Furthermore, a detailed characterization based on Fourier Transform Infrared Spectroscopy, X-ray Photoelectron Spectroscopy and Time-of-flight Secondary ion Mass Spectrometry confirmed that the formed inorganic-rich solid electrolyte interphase on the electrode surface effectively maintained the solid-liquid interfacial stability at low temperature. This work provided design concepts for ultralow temperature electrolytes for metal-based anodes, which were especially helpful for further promoting batteries for low temperature applications.
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Journal of Physical Chemistry C
·
2023
·
IF 3.7
Hongxiang Wu,Yibo Wang,Zhaoping Shi,Dongchen Han,Jiahao Yang,Pengbo Wang,Jing Ni,Meiling Xiao,Changpeng Liu,Wei Xing
The successful deployment of proton-exchange membrane water electrolyzers (PEMWEs) relies on the development of an active and durable electrocatalyst for the anodic oxygen evolution reaction (OER). Although rutile IrO2 shows excellent durability due to its stable crystal structure, it suffers from unsatisfactory activity. Here, we report a partial Sn substitution strategy to trigger lattice oxygen reactivity toward boosted OER. The similar crystal structures of IrO2 and SnO2 promote uniform incorporation of Sn into the lattice of IrO2, thus retaining the durability of the pristine rutile phase. More importantly, the electron transfer from Ir to Sn through the local structure of Ir–O–Sn was found to enhance the Ir–O bond covalency, which in turn activated the lattice oxygen to participate in OER. The enhanced lattice oxygen mechanism (LOM) was further verified by in situ 18O isotope labeling in situ differential electrochemical mass spectroscopy (DEMS). Due to these attributes, the as-designed Ir0.83Sn0.17O2 catalyst showed significantly improved performance, with an overpotential of only 284 mV at a current density of 10 mA cm–2, 38 mV lower than that of the commercial IrO2. In addition, the mass activity of the Ir0.83Sn0.17O2 catalyst reaches as high as 130 A gIr–1 at 1.55 V, which is 2.58 times higher than that of commercial IrO2. Beyond that, the intrinsic stability of the rutile phase endows the Ir0.83Sn0.17O2 catalyst with excellent operational durability. This work provides a novel insight into the improvement of catalyst activity and inspires the design of highly active and stable OER catalysts.
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FOOD HYDROCOLLOIDS
·
2023
·
IF 10.7
Zhenfeng Huang,Huixin Xie,Tingting Hu,Jiarui Zeng,Xiaofei Tian,Zhenqiang Wu
Natural Monascus yellow pigments (MYPs) have received considerable attention due to their great safety and biological activities, but their unsatisfactory color tonality and stability limit their applications. A novel encapsulate system for hydrophilic yellow pigments (HYPs) were investigated through stable ternary nanocomplexes using quercetin-Sn (II), bovine serum albumin (BSA), and chitosan (CS) in this work. Layer-by-layer assembly preparation of HYPs-loaded quercetin-Sn (II)-BSA-CS nanocomplexes were verified by fluorescence spectroscopy, fourier transform infrared spectroscopy , X-ray photoelectron spectra, and 1 H nuclear magnetic resonance. A hyperchromic effect on HYPs was obtained since their maximum ultraviolet absorption wavelength redshifted from 352 nm to 364 nm first due to the interaction with quercetin-Sn (II) and further redshifted to 408 nm due to ternary conjugation, greatly improved the color tonality and dye-uptake. The HYPs-loaded nanocomplexes showed irregular glomerate nanosphere with 252–382 nm of particle size. Their conjugation remitted HYPs degradation under various environmental stresses (thermal, light, and ascorbic acid treatment), and had a great color stability response to pH change. Higher lipid-lowering and antioxidant activities were detected in the nanocomplexes than free HYPs. This study provides a new way for fabricating novel MYPs with great physicochemical stability, bright color and hypolipidemic activities.
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