JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2021
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IF 8.067
Wei Luo,Yi Liu,Chuangye Wang,Dan Zhao,Xiaoyan Yuan,Jianfeng Zhu,Lei Wang,Shouwu Guo
The morphology of MAX phase powders significantly influences their microwave absorption properties. However, the traditional synthesis via solid-state reactions produces irregular powders, and the preparation of MAX phase powders with specific morphology remains a challenge. Herein, (V 0.8 Ti 0.1 Cr 0.1 ) 2 AlC MAX phase microrods were fabricated for the first time in NaCl/KCl molten salts using vanadium, titanium, chromium, aluminum , and short carbon fibers as precursors. It was found that despite acting as a carbon source, carbon fibers also acted as sacrificial templates. By adjusting the molar ratio of metal powders and short carbon fibers, a series of carbon fiber@(V 0.8 Ti 0.1 Cr 0.1 ) 2 AlC microrods with core-sheath structure were also obtained. Carbon fiber@(V 0.8 Ti 0.1 Cr 0.1 ) 2 AlC microrods with a molar ratio of 8:2 showed the optimum microwave absorption performance. The reflection loss (RL) value reached up to –63.26 dB at 2.40 mm, and the effective absorption bandwidth (EAB) was about 5.28 GHz with a thickness of 2.02 mm. Based on the electromagnetic parameter analysis and theoretical simulation, the enhanced microwave absorption performance was attributed to the synergistic effect of different factors like dielectric loss, magnetic loss, multiple reflection, and scattering. This work offers a facile route to modulate the morphology of MAX phase powders and may accelerate its application as microwave absorbers.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Yuantao Li,Jiajun Zhu,Jiyang Xie,Yongyun Mao,Wanbiao Hu
Constructing three-dimensional (3D) hierarchical bimetallic pseudocapacitive materials with abundant opening channel and heterojunction structures is rather promising but still challenging for high-performance supercapacitors. Herein, a self-sacrifice-template epitaxial growth strategy was proposed for the first time to construct 3D hierarchical bimetallic pseudocapacitive material. By using this strategy, NiCo 2 O 4 nanowires (NiCo 2 O 4 NW) arrayed randomly to form a porous shell via in-situ epitaxial growth fully enclosing a MnO 2 tube core, forming multiple transport channels and nano-heterojunctions between MnO 2 and NiCo 2 O 4 NW, which facilitates electron transfer, i.e. exhibiting high electronic conductivity than any single component. As a result of the self-sacrifice-template epitaxial growth method, special hollow tectorum-like 3D hierarchical structure with considerable inter-nanowire space and hollow interior space enables easy access of electrolyte to NiCo 2 O 4 NW surface and MnO 2 core, thereby resulting in highly exposed redox active sites of MnO 2 core and NiCo 2 O 4 NW shell for energy storage. Comprehensive evaluations confirmed MnO 2 @NiCo 2 O 4 NW was a supercapacitor electrode candidate, delivering a superior energy density of 106.37 Wh kg −1 . Such performance can be ascribed to the synergistic coupling effect of 3D hierarchical tube and nano-heterojunction structures. The proposed self-sacrifice-template epitaxial growth strategy provides important guidance for designing high-performance energy storage materials.
研究领域:
材料科学
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储能技术
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纳米材料
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 7
·1229
·
IF 5.3
Jing Li,Jun Li,Meng Shao,Yanan Yan,Ruoliu Li
At present, binary bimetallic sulfides are widely studied in supercapacitors due to their high conductivity and excellent specific capacitance (SC). In this article, NiCo-S nanostructured hybrid electrode materials were prepared on nickel foam (NF) by using a binary metal–organic skeleton as the sacrificial template via a two-step hydrothermal method. Comparative analysis was carried out with Ni-S and Co-S in situ on NF to verify the excellent electrochemical performance of bimetallic sulfide as an electrode material for supercapacitors. NiCo-S/NF exhibited an SC of 2081 F∙g−1at 1 A∙g−1, significantly superior to Ni-S/NF (1520.8 F∙g−1at 1 A∙g−1) and Co-S/NF (1427 F∙g−1at 1 A∙g−1). In addition, the material demonstrated better rate performance and cycle stability, with a specific capacity retention rate of 58% at 10 A∙g−1than at 1 A∙g−1, and 75.7% of capacity was retained after 5000 cycles. The hybrid supercapacitor assembled by NiCo-S//AC exhibited a high energy density of 25.58 Wh∙kg−1at a power density of 400 W∙kg−1.Keywords:MOF;self-sacrificing template;transition metal sulfides;supercapacitor
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
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2020
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IF 2.87
Zewen Zhang,Yueping Bao,Xun Sun,Ke Chen,Mingjiong Zhou,Liu He,Qing Huang,Zhengren Huang,Zhifang Chai,Yujie Song
Membrane separation has been widely used in water purification, and mesoporous ceramic membranes show a high potential in the future because of their high stability and resistance to harsh environments. In the current study, a novel polymer-derived ceramic silicon oxycarbide (SiOC) membrane was developed via a preceramic reactive self-sacrificed method and was further applied in a homemade dead-end system for water purification. A cyclosiloxane hybrid polymer was selected as the precursor and polydimethylsiloxane (PDMS) was used as the sacrificial template. Membrane pores were formed because of template removal during the sintering process, creating channels for water transportation. The pore size and porosity could be readily adjusted by changing the amounts and types of PDMS used in the fabrication process. The as-prepared SiOC membrane showed a high water permeability (140 LMH@2.5 bar) and high removal rate of rhodamine B (RhB), demonstrating its potential applications in water treatment. This work would provide an easy and scalable method to prepare ceramic membranes with a controlled pore size, which could be used for different water treatment applications.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
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2021
·Vol. 23
·期 40
·7090-7096
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IF 3.545
Chong Lin,Xiao He,Huiqin Li,Junjie Zou,Miaoling Que,Jingyang Tian,Yong Qian
Metal–organic frameworks (MOFs) are regarded as advanced materials for oxygen evolution reactions (OER) because of their large specific surface area, adjustable pore size and abundant intrinsic molecular/atomic metal active sites. However, their essential features, such as the organic-ligand-shielded metal centres and low conductivity, make their electrocatalytic potential far from being exploited. These undesired issues can be avoided by designing and constructing MOF nanoarrays (MOF NAs) on self-supporting and conductive substrates such as the carbon cloth. Transforming appropriate solid material nanoarrays into MOF NAs provides a possibility to unlock the bottleneck. Herein, we have successfully developed a general approach for the morphological and electronic modulation of Co/Ni-MOF-74 NAs with wall-like Co/Ni(OH)2 NAs as the self-sacrificing template. The wall- or spindle-like morphology of MOF-74 NAs was modulated by changing the dosage of ligand. As a result, Co/Ni-MOF-74 NAs displayed superior activity and stability to those of Co/Ni-MOF-74 prepared without the template. The Co0.5Ni0.5-MOF-74 NAs delivered a low overpotential of 244 mV at a current density of 10 mA cm−2 due to the high proportion of active high-valence Co(III) and Ni(III). The proposed strategy can be extended to obtain brick-like Ni-BDC NAs and needle-like Ni BTC MOF NAs on carbon cloth.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2017
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IF 4.798
Xiaoyu Xie,Xiaojun He,Xiaolong Shao,Shian Dong,Nan Xiao,Jieshan Qiu
It is a challenge to synthesize low-cost carbon materials with abundant pores by a simple route for supercapacitors. Herein, layered microporous carbons (LMPCs) with the specific surface area up to 1865 m 2 g −1 are fabricated from coal tar and melamine via a directing, space-confinement and self-sacrificed template strategy coupled with in-situ KOH activation. The button-type supercapacitor fabricated from LMPCs exhibits a high specific capacitance of 274 F g −1 at 0.05 A g −1 , a good rate performance of 191 F g −1 at 20 A g −1 and a superior cycle stability with 98.8% capacitance retention after 10000 cycles. This work presents a facile strategy for mass production of LMPCs from liquid polycyclic hydrocarbon molecules for supercapacitors.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
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2022
·Vol. 29
·期 6
·1895-1908
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IF 2.523
Li Jinhao,Bao Agula
The current greenhouse effect issue and climate change crisis has urged the advancement of highly efficient and cost-effective CO 2 adsorbents for environmental remediation. We present a sustainable and convenient self-sacrificed templating method for the preparation of nitrogen-doped hierarchical porous carbons (GNCK-X-Y). Glucose serves as a carbon source for the GNCK-X-Y, and graphitic carbon nitride (g-C 3 N 4 ) is used as both a self-sacrificing template and nitrogen doping agent during pyrolysis. The use of these precursors will allow for substantial cost reductions, making the designed materials considerably attractive from an industrial perspective. The adsorbents all demonstrated large specific surface areas and well-developed porosities. Furthermore, the influences of the carbonization temperature and activator on CO 2 capture performance were also systematically investigated. The samples prepared under the optimum conditions exhibit excellent CO 2 uptake capacities of up to 3.65 and 6.12 mmol/g at 25 ℃ and 0 ℃ (1 bar), respectively. The outstanding CO 2 capacity of the material can be attributed to the cooperative effect produced by its surface structure and chemical composition. Additionally, this adsorbent also displays moderate adsorption heat, high CO 2 /N 2 selectivity, excellent reusability and a certain adsorption performance at higher temperatures. These characteristics give the as-synthesized materials broad practical application prospects for CO 2 capture.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2023
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IF 3.3
Qianglong Chen,Ruibin Guo,Yangyang Jiang,Li li,Wenjing Qin,Yanchun Tan,Nijuan Liu,Zunli Mo
Three-dimensional amorphous silver lug-like CoNi 2 S 4 electrode materials have been designed and synthesised by the sacrificial template method. Through a clever combination of Ni 2+ induced template deficiency and sulphidation reactions, the rearrangement of the electronic structure can be promoted, generating more defects. The Ni element-doped electrode significantly improves the capacitance due to the bimetallic synergy and has a high mass specific capacitance of 1351 F g −1 at a current density of 4 A g −1 . The specific capacitance was 1111 F g −1 at a current density of 20 A g −1 , showing an excellent multiplicative performance (82.2%).
研究领域:
材料科学
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能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Jiayu Hao,Yanqiu Wang,Xiaoqing Qiu,Min Liu,Wenzhang Li,Jie Li
It is still a challenge to achieve efficiently controlled preparation of functional oxygen reduction reaction (ORR) carbon electrocatalysts with multi-preferred structures (hierarchically porous networks and specific carbon–nitrogen bonds) from carbohydrate-containing small molecules via simple one-step pyrolysis. Based on the step-by-step spontaneous gas-foaming strategy, we successfully prepare 3D hierarchically porous networks with tunable N sites (NP/NG ≈ 1:1) by pyrolyzing diverse carbohydrates (glucose, maltose, and cyclodextrin) using nonmetal–metal dual inorganic sacrificial templates. In situ evaporation templates can simplify the procedure of the experiments and avoid the active site loss compared with traditional hard templates. Crucially, dual inorganic sacrificial templates can induce abundant defects and microscopic pore structures (the specific surface area increased from 922.403 to 1898.792 m2·g–1) and tunable N sites compared with single nonmetal sacrificial templates. The regulatory mechanism of dual inorganic templates on N sites (NP/NG ≈ 1:1) is independent of the polymeric state of carbohydrate precursors or even the carbonization condition of the pyrolysis process. A series of carbon materials prepared by this strategy all have ORR-preferred structures and exhibit low ORR overpotentials compared with Pt/C. For instance, the Zn–air battery with βCD-DSC-950-1 exhibits an open-circuit potential of 1.51 V and a peak power density of 180.89 mW·cm–2, higher than those of Pt/C (1.47 V, 174.94 mW·cm–2). In general, the conversion of carbohydrate-containing small molecules to functional carbon materials provides a new strategy for the development of carbonaceous electrocatalysts.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2017
·
IF 0
Yao Zhang,Wansen Zhang,Shuiyun Shen,Xiaohui Yan,Ruofei Wu,Aiming Wu,Christian Lastoskie,Junliang Zhang
In this work, a hollow LiNi1/3Co1/3Mn1/3O2 (H-NCM) nanosphere cathode with excellent electrochemical performance is developed for lithium-ion batteries. Preparation of the H-NCM nanospheres involves the sacrificial template method, in which carbon nanospheres work as the template and polyvinylpyrrolidone works as an additive. Structural and morphological analyses show that the as-prepared H-NCM nanospheres are highly uniform with diameters of approximately 50 nm and wall thicknesses of 10 nm. Electrochemical tests demonstrate that the H-NCM cathode not only manifests outstanding rate performance in the potential window of 2.5–4.5 V with high reversible specific capacities of 205.6, 194.9, 177.8, 165.9, 151.7, 126.0, and 115.3 mA h g–1 at 0.1, 0.2, 0.5, 1, 2, 5, and 10 C, respectively, but also delivers excellent stability with a capacity retention of 60.1% at 10 C after 2000 cycles. The superior electrochemical performance of the H-NCM cathode can be put down to the distinctive hollow interior structure with thin nanostructured walls, which can synergistically benefit the significantly enhanced rate capability and cycling stability.
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
PubMed
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiaofei Zhai,Jingyi Chen,Yaru Wang,Ruyue Su,Xiong Gao,Xueqin Zhang,Hua Jin,Rujie He
When preparing ceramic materials, high porosity and high strength are often played against each other. How to balance porosity and strength has become a core issue in the 3D printing of ceramic cores. In this work, alumina ceramic cores with a high porosity (36.93%) and a high flexural strength (75.4 MPa) were prepared by combining the vat photopolymerization 3D printing with sacrificial templating. The porosity of alumina ceramic cores was improved by the sacrificial templating method, and the flexural strength was enhanced with alumina particle grading. The effects of pore former (PMMA) content and particle size on the shrinkage, porosity, microstructure, and comprehensive performance of alumina ceramic cores were investigated to reveal the mechanism of simultaneous high porosity and high strength.
研究领域:
材料科学
·
制造工程
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Jinsong He,Wenjie Liu,Fan Ni,Dong Tian,Yongjia Lei,Jianmei Zou,Yanzong Zhang,Fei Shen,Xiaochan An
Sacrificed template strategy has become a promising pathway to construct high performance loose nanofiltration (LNF) membranes for dye-containing wastewater treatment. However, few studies have been conducted on the recycling of templates in the LNF membrane preparation. In this study, lignin nanoparticles (LNPs) with abundant biomass sources, low cost, renewable ability, were attempted to be used as a recycled sacrificed template for the first time. The LNPs were easily renewed by concentration and NaOH dialysis with smaller nano-size and more hydrophilic surface. The optimized P-LNF-50 membrane prepared by pristine LNPs templates exhibited high water permeability of 146.24 LMH·bar −1 , excellent separation of dye/salt (i.e. rejection: 97.79 % for CR, 0.48 % for Na 2 SO 4 , 0.25 % for NaCl), and superior long-term stability. Interestingly, the R1-LNF-70 membrane prepared by 1 st recycled LNPs templates can still maintain high water permeability of 132.97 LMH·bar −1 and excellent separation of dye/salt (i.e. rejection rate: 98.31 % for CR, and 1.27 % for Na 2 SO 4 ). While the 2 nd recycled LNPs can not produce satisfied LNF membranes due to its poor figuration and easy aggregation. The inherent relationships between LNPs templates and selective layers were deeply explored. Importantly, the Sankey chart of recycling LNPs template technique and cost analysis indicated that the LNPs could be used as green templates for two cycles with comparable permeability and selectivity of dye/salts. Overall, our study paves the way for recycling of sacrificed templates for the scalable fabrication of high performance LNF membranes.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）