CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 7
·12539-12548
·
IF 5.1
Wei Dang,Ziang Li,Bowen Wang,Zhuoli Xu,Xinyuan Zhang,Fuping Li,Kang Zhao,Jun Ma,Yufei Tang
Because of the inherent high-temperature resistance, the application of ZrO 2 nanofiber aerogels in thermal insulation is promising. However, the contradiction between mechanical and thermal insulation properties has limited its applications. In the present work, nanofiber aerogels of ZrO 2 /SiO 2 /C with enhanced thermal insulation and compressive strength were successfully prepared by freeze-casting using tetraethoxysilane (TEOS) as a binder. The effect of TEOS content on the microstructure, compressive and thermal insulation properties was investigated. The porosity of the fabricated aerogels is higher than 97.3 %. The pore structure exhibits hierarchical characteristics, with honeycomb pores on the micro-scale and mesopores on the nano-scale. Part of the SiO 2 phases generated by TEOS hydrolysis bond ZrO 2 nanofiber to form fiber junctions, while the others cover the surface of ZrO 2 nanofibers forming core-shell structure. With the increase of TEOS content, ZrO 2 /SiO 2 /C nanofiber aerogels showed a slightly decrease in thermal conductivity to a lower value of 0.032 W m −1 K −1 and an increase in compressive stress to 11.9 KPa. The thermal insulation mechanism and deformation mode during compression of aerogels were analyzed. This study not only provide ZrO 2 /SiO 2 /C nanofiber aerogels with both enhanced mechanical and thermal insulation properties, but also can guide the design and fabrication of other ceramic aerogels with excellent properties.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 17
·30579-30586
·
IF 5.1
Cheng Wang,Yangmin Tang,Guiqiang Pu,Wei Chen,Mingxue Deng,Jiacheng Wang
Ultraviolet C (UVC) light has a great promising application in the field of sterilization. However, how to obtain efficient UVC emission with peak maximum at 265 nm that is called ‘golden sterilization wavelength’ remains a great challenge. Herein, we propose a defect-engineering strategy to obtain enhanced UVC emission at the golden sterilization wavelength of 265 nm through introducing oxygen vacancies into Pr 3+ doped Ba 2 MgSi 2 O 7 melilite phosphors. Combined with X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR) and thermoluminescence (TL) characterizations, it is confirmed that the calcination of Ba 2 MgSi 2 O 7 :Pr 3+ in an inert atmosphere could efficiently increase oxygen vacancy concentration, promoting the efficient energy transfer from the melilite host to Pr 3+ ions. It could lead to a significant enhancement of the luminescence intensity to 2.43 times of the initial one with less oxygen vacancies . The optimized Ba 2 MgSi 2 O 7 :0.4%Pr 3+ phosphor could effectively inactivate 100 % of Staphylococcus aureus within 8 min, showing higher efficiency than commercially available mercury lamp. This work provides an effective solution for the design and preparation of UVC phosphors using defect engineering to achieve golden UVC emission.
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 10
·4122-4128
·
IF 3.288
Feiyuan Sun,Hao Feng,Shilun Gao,Dandan Yang,Huabin Yang
A silicon/antimony/antimony oxide/graphite@amouphous carbon (Si/Sb/Sb2O3/G@C) composite material was prepared successfully via a simple ball milling and high temperature calcination process. Its structural characterization showed that Si and Sb/Sb2O3 were dispersed into the graphite layer and coated with amorphous carbon. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) results revealed that Sb2O3 was partly reduced to Sb by carbon, which could improve its electronic conductivity. Besides, Si, Sb, Sb2O3 and carbon have different lithiation/delithiation voltage plateaus, which can act as a mutually buffering matrix, thus improving its electrochemical performance. Due to the high specific capacity, good electronic conductivity and stable cycling performance benefited from the Si/Sb/Sb2O3, Sb/G and G/C, respectively, as well as the mutually buffering matrix of all the active materials, the resulting composite electrode materials exhibit excellent electrochemical performance. The composite material exhibited good cycling performance (a stable reversible delithiation capacity of 567.8 mA h g−1 after 180 cycles), excellent rate capability (∼360 mA h g−1 and 280 mA h g−1 at current densities of 1000 mA g−1 and 2000 mA g−1, respectively) and decreased polarization resistance. This work demonstrates a facile and cost-effective approach to preparing composite materials with complementary advantages for use in high-performance Li-ion batteries.
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Zhuosen Wang,Xijun Xu,Zhengbo Liu,Shaomin Ji,Sahar Osman Ahmed Idris,Jun Liu
Lithium–sulfur batteries (LSBs) have attracted much attention in the field of electrochemical energy storage due to their high energy density and low cost. However, the ‘shuttle effect’ of sulfur cathode, resulting in the poor cyclic performance of batteries, is a big barrier for the development of LSBs. To overcome this critical drawback, herein, a matrix of well-designed double carbon shells-encapsulated metallic Mo 2 C nanoparticles (Mo 2 C/C@C) is facilely achieved as an efficient sulfur host for high-performance LSBs. During the electrochemical process, the embedded polar and metallic Mo 2 C nanoparticles could effectively retard polysulfide migration. While for the carbon layers, they can not only act as conductive matrix but also promote the restriction for all sulfur species and maintain the structural stability simultaneously. Specially, the inner carbon layer is mainly for encapsulation and the outside one for surface-modification. As a result, such well-designed Mo 2 C/C@C–S cathode could effectively adsorb soluble polysulfides both from chemical and physical aspects, and well confines them inside the porous structure of Mo 2 C/C@C, thus achieving a high reversible capacity and superior cycling performance.
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DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 14
·期 6
·5820-5830
·
IF 1.5
Yao Liug,Xiaojing Liug,Junli Liu,Chaozhong Guo,Yanrong Li,Jin Zhang,Zhongbin Li
Ternary Fe-N-C catalysts are regarded as the most promising candidates for low-cost alternatives to the Pt-based materials for catalyzing the oxygen reduction reaction (ORR). In this paper, the Fe and N codoped carbon catalyst (Fe-Py@K-800) with the unique foam-like 3D structure has been fabricated by using the molecular sieve as a new solid-state template. The results of physical characterization indicate that Fe atoms are coordinated with nitrogen atoms to form the Fe-N ORR-active structure. In contrast with the commercial Pt/C catalyst, the Fe-Py@K-800 displays a comparable ORR electrocatalytic activity with an onset potential of ~1.1 V and a half-wave potential of ~0.88 V ( vs. RHE), however, the long-term stability of Fe-Py@K-800 is obviously better. These results show that iron-organic coordination in the pyrrole ring will play a role in the generation of nitrogen-rich active sites, which facilitates the enhancement of ORR activity in alkaline electrolyte.
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DOI
高影响因子
IONICS
·
2022
·Vol. 28
·期 11
·4977-4987
·
IF 2.961
Shi Chonghua,Fu Hang,Nie Jiajin,Yao Shaowei
Bismuth-based material as a stable anode material for lithium-ion battery, which has the advantages of stable operating voltage and large volume energy density. In order to make the most of the theoretical specific capacity of 386 mAh g −1 bismuth-based materials, the carbon coating method will be used to obtain stable specific capacity. However, electrostatic spinning is great method of carbon coated precursor preparation. Here, the BiCl 3 reagent is added into the PAN-DMF spinning liquid to synthesize the fibrous Bi@C composites precursor, and the Bi@C fibre is obtained after heat treatment. Then the Bi@C fibres with different BiCl 3 content are used as anode materials for lithium-ion batteries to test the electrochemical performance of Bi@C. The results show that Bi@C fibre electrode can maintain the discharge capacity of 415.3 mAh g −1 at the current density of 100 mA g −1 for 100 cycles when the content of BiCl 3 is 1.5 g. When the current density is 500 mA g −1 , the specific capacity can still reach 415.7 mAh g −1 after 250 cycles and shows excellent electrochemical performance.
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DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Yingang Gui,Shasha He,Yunfeng Wang,Jiacheng Yang
This study proposed a self-powered bio-sensing positioning system driven by MOF-derived porous Ni/C material-based hybrid nanogenerator. The porous structure of Ni/C nanoparticles provides a high specific surface area, increases the capacitance of the nano-composite, and traps more charges due to the formation of micro-capacitors, which boost the performance of TENGs. The as-fabricated enhanced TENG achieved a peak voltage of 820 V and a power density of 10.1 W/m 2 . An optimal bilayer structure was determined through experiments and simulations to obtain the maximum output performance. Flexible TENGs are placed on various parts of the body to achieve biomechanical energy harvesting and motion monitoring, and provide power sources for small electronics. By combining with electromagnetic generator (EMG), a wearable self-powered positioning system is constructed. This work provides a new idea to enhance the output of TENG, and broadens the application of TENG in self-powered wearable systems.
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DOI
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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DOI
高影响因子
IONICS
·
2021
·Vol. 27
·期 8
·3663-3669
·
IF 2.817
Xiang Tong,Chen Zhi,Rao Zhixin,Yan Mingge,Feng Zhijun,Li Xibao,Yang Huiyong,Huang Juntong,Shen Xing
Iron carbide (Fe 3 C) has gained significant attention for use in energy storage applications. Furthermore, using a nano-scale metal as the catalyst can reduce the formation of a solid electrolyte interface (SEI), thus enhancing capacity. For these reasons, hierarchical Fe/Fe 3 C/C nanofibers are prepared by electrospinning with subsequent thermal treatment and used as the anodes for lithium ion batteries (LIBs). These anodes demonstrate a good rate and high capacities. At 0.1 A g −1 , the Fe/Fe 3 C/C nanofiber electrode maintains 518 mA h g −1 after 100 cycles. When tested at 1 A g −1 , the discharge capacity gradually increases and reaches 663 mA h g −1 after 1200 cycles. This work demonstrates the possibility to design and develop transition metal carbides (TMCs) for use in energy storage.
研究领域:
材料科学
·
储能技术
·
纳米技术
·
电化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Rui Yang,Xuefeng Bai,Xiangfeng Guo,Kun Song,Lihua Jia,Xiaoshuang Chen,Jun Wang
The rational construction of hierarchical electrode materials has always been an attractive strategic development in energy storage. In this paper, the porous Ni/C (NC) substrate, which is derived from Ni metal–organic frameworks (Ni-MOFs), is served as the conductive skeleton on Ni foam (NF) for supporting two different morphologies NiCo 2 O 4 nanostructure arrays (NiCo 2 O 4 /NC). The hierarchical layered nanomaterial utilizes the porous NC substrate as “favorable skeleton” for electron transfer and is coupled to vertical well-organized NiCo 2 O 4 nanoarrays to improve specific capacitance of composites. Benefits from the advantages of hierarchical layered structure, the electrochemical properties of as-constructed NiCo 2 O 4 /NC with two different morphologies were better than those of pure NiCo 2 O 4 prepared under the same conditions. Moreover, the optimized NiCo 2 O 4 nanowires arrays on NC substrate (NiCo 2 O 4NWs /NC) electrode acquire prominent specific capacitance of 1945.9 F g −1 (270.3 mAh g −1 ) at 1 A g −1 and good rate performance. Additionally, the assembled asymmetric device by NiCo 2 O 4NWs /NC and carbon nanotube (CNT) displays a high energy density of 58.31 Wh kg −1 at a power density of 749.7 W kg −1 , as well as good cyclic stability. The remarkable properties manifest that the hierarchical NiCo 2 O 4NWs /NC electrode has a good prospect in electrochemical applications.
研究领域:
材料科学
·
能量存储
·
电化学
·
纳米材料
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DOI
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 40
·19195-19202
·
IF 7.233
Xin-Yang Yue,Zhong Yan,Yun Song,Xiao-Jing Wu,Yong-Ning Zhou
Si/C composites are considered as the most promising anode materials for next-generation lithium-ion batteries (LIBs) due to their high specific capacity and low cost. However, the commercialized Si/C composites cannot maintain a Si content over 10 wt% for sustaining an acceptable cycle life. To achieve long-term cycle stability for Si/C composites with high Si content is still very challenging. Here, we report a rationally designed double-morphology Si/graphene (DMSiG) composite with a high Si content of 78 wt%, and prove its feasibility as a high performance anode material for LIBs. DMSiG composes of Si quantum-dot decorated graphene and mesoporous Si spheres with a complementary hierarchical structure. The graphene framework enhances the electronic conductivity, alleviates the aggregation of mesoporous Si spheres and provides space and flexibility to buffer the volume change during cycling. Mesoporous Si spheres contribute to a large reversible capacity and support the hierarchical architecture of DMSiG. The Si quantum-dots help to build firm connections between graphene and mesoporous Si spheres to avoid their separation during cycling. Coupling these features together, the DMSiG anode delivers a high reversible capacity of 1318 mA h g−1 at a current density of 500 mA g−1 and 684 mA h g−1 at 2000 mA g−1.
研究领域:
材料科学
·
储能
·
电化学
·
纳米材料
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.3
Hongwei Zhou,Ying Lin,Yongzhen Ma,Zhao Meng,Haibo Yang
To obtain high-performance electromagnetic wave (EMW) absorption materials with a broad effective absorption bandwidth (EAB), structural design has proven to be an effective strategy. In this investigation, Co/C@carbon nanofibers (Co/C@CNFs) derived from metal-organic frameworks (MOFs) were integrated with graphite oxide (GO) nanosheets, and Co/C@CNFs/GO aerogels were prepared through unidirectional freeze-drying followed by heat treatment. The resulting aerogels exhibit a unique directional channel structure that increases their contact area with air, thereby improving impedance matching. The Co/C@CNFs/GO aerogels demonstrate exceptional EMW capabilities, primarily due to the multiple heterogeneous interfaces and the synergistic electromagnetic loss mechanisms generated by the interactions among GO nanosheets, CNFs, and Co particles. The results reveal that Co/C@CNFs/GO-2 achieves remarkable EMW absorption with a maximum EAB of 10.0 GHz, covering both the X and Ku bands, thanks to its directional channel structure and complete conductive network. Moreover, the aerogels exhibit excellent radar cross-section attenuation and superior thermal insulation. This work provides a reliable strategy for synthesizing multifunctional carbon-based aerogels materials with efficient EMW absorption, offering broad potential for applications in electromagnetic protection, thermal management, and related fields.
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高影响因子
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