Journal of Physical Chemistry C
·
2019
·
IF 4.309
Wenxiang He,Xingchen He,Meili Du,Shiyu Bie,Jianguo Liu,Yiqing Wang,Meng Liu,Zhigang Zou,Wuwei Yan,Haimin Zhao
Improving the sulfur loading, conductivity, and polarity of the sulfur host is the main effective strategy used to solve the inherent problem of lithium–sulfur batteries for practical applications. Herein, a three-dimensional hybrid sulfur host composed of graphitic carbon nitride and functionalized carbon nanotubes is prepared via a self-assembly-assisted method assisted by calcination. The structural analysis results indicate that graphitic carbon nitride sheets are grown in situ on the surfaces of the carbon nanotubes and that the two components are connected by C–N bonds to form a larger π-conjugated system. This unique structural linkage between the two parts directs electron transfer from the carbon nanotubes to the carbon nitride, resulting in enhanced conductivity of the integrated hybrid composite and processing a sufficient number of nitrogen-containing functional groups. Thus, as a sulfur host, the hybrid composite can efficiently restrain the shuttle effect of intermediate polysulfides because of its high sulfur utilization and strong chemical interaction with polysulfides. As a result, a modified sulfur cathode with a high sulfur content of 80 wt % delivers a high specific capacity of 1351.2 mAh g–1 at a rate of 0.1 C. Even at a 5 mg cm–2 sulfur loading, the cathode exhibits an initial capacity of 758.9 mAh g–1 with a capacity retention of 77.1% after 200 cycles at 1 C.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米复合材料
·
电池技术
✓ 已验证
DOI
高影响因子
NEW CARBON MATERIALS
·
2022
·
IF 3.7
Yi-ming Zou,Chang-chun Sun,Shao-wen Li,Miao Bai,Yu-xuan Du,Min Zhang,Fei Xu,Yue Ma
A coaxial anode with a carbon fiber core encapsulated in nanocrystalline FeNiMnO 4 with a nitrogen-doped carbon sheath was prepared using carbon fiber cloth as the core, FeNiMnO 4 nanocrystallite arrays as the first coating layer and nitrogen-doped carbon derived from F127 (a kind of triblock copolymer)-resorcinol-melamine gel as the outer layer. After annealing at 600 °C it was used as the anode material of an all solid flexible lithium ion battery using LiFePO 4 as the cathode material and boron nitride modified polyethylene oxide as the electrolyte. The battery had a large areal capacity of ∼1.40 mAh cm −2 and satisfactory cycling stability under different bending and strain states. Annealing below 600 °C leads to incomplete carbonization of the nitrogen-doped carbon and thus a low electrical conductivity while above 600 °C aggregation of FeNiMnO 4 nanocrystallites and their detachment during cycling are observed under bending and strain.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能材料
✓ 已验证
DOI
高影响因子
AQUA-Water Infrastructure Ecosystems and Society
·
2021
·Vol. 70
·期 4
·570-586
·
IF 0
Liu Jiamin,Li Jianjun,Liang Juan,Jing Chengjun,Guo Jiaxiu
Carbon dot (CD)-modified graphitic carbon nitride (g-C 3 N 4 ) photocatalysts were synthesized through a one-step homogeneous thermal pyrolysis. The synergetic effect of citric acid (Cit) and g-C 3 N 4 /CDs for high-performance visible light Cr(VI) photocatalytic reduction had been investigated. Cit was not only acted as a hole scavenger, but might also form surface charge transfer complexes (CTC) with g-C 3 N 4 which delivered electrons on the Highest Occupied Molecular Orbital (HOMO) of Cit to the conduction band (CB) of g-C 3 N 4 . CDs decorated on g-C 3 N 4 could provide channels for the preferential transfer of electrons on CTC to the CB of g-C 3 N 4 as well as improved separation of the charge carriers. Owing to these synergistic effects, g-C 3 N 4 /CDs displayed much higher photocatalytic performance for the reduction of Cr(VI), which was 1.89 times higher than g-C 3 N 4 . Moreover, the synergetic photocatalytic reduction mechanisms of aqueous Cr(VI) were proposed to elucidate the active species formation and photogenerated electron transfer. The results suggested that the in situ generated hydrogen peroxide (H 2 O 2 ) dominated the reduction of Cr(VI). The addition of Cit could trigger the in situ generation of H 2 O 2 and the decorated CDs further enhanced the reaction. This work demonstrated the role of widely existed Cit on the photocatalytic reduction of Cr(VI) in natural aquatic environment. g-C 3 N 4 /CD photocatalysts were synthesized for Cr(VI) reduction. CDs promoted light harvest and improved the separation of charge carriers. Cit triggered the visible light photocatalytic reduction of Cr(VI) over g-C 3 N 4 /CDs. H 2 O 2 is the main effective activator for Cr(VI) reduction in the g-C 3 N 4 /Cit system. The photocatalytic reduction pathways of Cr(VI) in the presence of cit were proposed.
研究领域:
环境化学
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光催化材料
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纳米材料
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水污染治理
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环境功能材料
✓ 已验证
DOI
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 15
·21459-21465
·
IF 4.527
Xianwei Su,Xiaojia Shang,Yusi Che,Shaolong Li,Jianxun Song,Jilin He
Homogenous ZrC x O y powders have been successfully synthesized by in-situ electro-reduction of solid ZrO 2 –C composite precursors in molten CaCl 2 . The effect of applied cell voltage and molar ratio of ZrO 2 to C on preparation of ZrC x O y were investigated. The reduction pathway of the composite electrode was studied based on the analysis of intermediate products using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that ZrO 2 is firstly converted to CaZrO 3 . The resulting CaZrO 3 is then reduced to ZrC x O y . The ZrC x O y formation is dramatically influenced by electrolysis voltage and molar ratio of ZrO 2 to C: a higher cell voltage and lower molar ratio of the ZrO 2 to C are more preferable for the formation of ZrC x O y powder. Homogenous ZrC x O y powders with particle size of ~100 nm are synthesized by ZrO 2 /C starting elemental powders in CaCl 2 molten salt at 1123 K for more than 3 h, when the cell voltage is 3.0 V and the molar ratio of the ZrO 2 to carbon starting materials is 1:1.0.
研究领域:
材料科学
·
无机非金属材料
·
电化学合成
·
粉末冶金
·
固态化学
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 7
·1901815
·
IF 4.948
Minglong Yang,Qiang Wei,Jianjun Li,Yao Wang,Hongfei Guo,Liya Gao,Li Huang,Xiaodong He,Yibin Li,Ye Yuan
Inspired by the traditional Chinese “pancake-making” method, the efficient electromagnetic interferences (EMI) shielding composite carbon films are conveniently obtained by assembling graphene oxide (GO) sheets, carbon nanotubes (CNTs), and Co/C nanocomposites into a laminated “nacre-like” structure. The developed composite carbon films are characterized by a shielding effectiveness (SE) up to ≈51 dB in X band with a small thickness of ≈34.3 µm. Moreover, the composite carbon film shows favorable flexibility and the SE values almost keep a constant after repeatedly bending test. These results demonstrate a promising approach to simply fabricate a flexible and highly efficient EMI shielding material.
研究领域:
材料科学
·
纳米科技
·
复合材料
·
电磁功能材料
·
柔性电子学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 51
·期 5
·6587-6598
·
IF 5.1
Bo Li,Yigao Chen,Shaopeng Wang
A (ZrC/SiC) 35 multilayer alternating coating with 500∼700 nm sublayers thickness and 70 interfaces was deposited on sharp leading edge C/C composites by continuous CVD method. Its mechanical property and ablation resistance were assessed by scratch test and oxy-acetylene flame respectively and compared with ZrC monolayered coating. The (ZrC/SiC) 35 multilayer alternating coating exhibited a high bonding strength via the regulation of sub-micro alternating stress field and the inhibition of crack propagation by 70 interfaces, showing a high critical load L C3 of 22.521 N, which was higher than that of ZrC monolayered coating of 5.688 N. Furthermore, the coating revealed excellent ablation resistance evidenced by its intact oxide layer, and the mass and linear ablation rates were only 0.17 mg/s and 0.87 μm/s respectively. The layer-by-layer oxidation behavior allowed the advantages of ZrC and SiC sublayers to be fully utilized, thus maintaining the layered oxide structure. Furthermore, the total 35 layers of thin ZrO 2 layers improved the fault tolerance ability of coating in harsh ablative environments.
研究领域:
材料科学
·
表面工程
·
高温防护涂层
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复合材料
·
力学性能
·
热防护系统
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xiao Bai,Hui Zhang,Junpin Lin,Guang Zhang
Si-carbon composites have been considered as next generation lithium-ion battery anodes, with a view to sufficiently exerting the respective superiorities of high specific capacity of Si as well as excellent mechanical flexibility and electrical conductivity of carbon. However, direct blending of carbon with Si cannot obtain a synergy composite, resulting in inferior cycle properties during charge–discharge due to huge volume changes and deficient electron-conducting channels from the unavoidably aggregated Si. Herein, the composition of carbon fibers (CNFs) with Si nanoparticles (SiNPs) has been performed through UV-ozone surface modification followed by electrostatic self-assembly. It is found that solvent-free UV-ozone exposure of CNFs for 20 min successfully introduces carboxylic groups, as conventional acid treatment for 12 h. Besides UV-ozone surface modification provides an efficient and scalable route, the distribution and functionalization of CNFs can be also modified to effectively combine with amino-functionalized SiNPs. As a result, such Si-CNF composites containing 70.0 wt% SiNPs are able to exhibit excellent cycle performance with high coulombic efficiency of 74.8% at the 1st cycle and high specific discharge capacity of 1063 mAh g −1 at the 400th cycle.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
表面工程
·
锂离子电池
✓ 已验证
DOI
高影响因子
Chemistry-An Asian Journal
·
2016
·Vol. 11
·期 12
·1849-1855
·
IF 4.592
Miao Zhang,Lin Liu,Teng He,Guotao Wu,Ping Chen
The synthesis of two-dimensional (2D) polymer nanosheets with a well-defined microporous structure remains challenging in materials science. Here, a new kind of 2D microporous carbonaceous polymer nanosheets was synthesized through polymerization of a very low concentration of 1,4-dicyanobenzene in molten zinc chloride at 400–500 °C. This type of nanosheets has a thickness in the range of 3–20 nm, well-defined microporosity, a high surface area (∼537 m 2 g −1 ), and a large micropore volume (∼0.45 cm 3 g −1 ). The microporous carbonaceous polymer nanosheets exhibit superior CO 2 sorption capability (8.14 wt % at 298 K and 1 bar) and a relatively high CO 2 selectivity toward N 2 (25.6). Starting from different aromatic nitrile monomers, a variety of 2D carbonaceous polymer nanosheets can be obtained showing a certain universality of the ionothermal method reported herein.
研究领域:
材料科学
·
环境化学
·
纳米科技
·
能源材料
·
多孔材料化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yidong Zhang,Rong Shao,Wei Xu,Jianfei Ding,Yuan Wang,Xiuhua Yan,Wenyan Shi,Min Wang
Hierarchical porous materials receive extensive attention due to their excellent electrode kinetic performance. Herein, a facile strategy is presented to fabricate hierarchical porous supercapacitor materials using NaCl-assisted MOFs gel as a structure-directing template. By controlling the additive amount of NaCl, hierarchical porous carbon-encapsulated Fe 3 C with tailored pore size distribution has been obtained with a high specific capacity of 184.1 mAh g −1 (602.3F g −1 ) at a current density of 1 A g −1 . The analysis of kinetics and impedance indicates that the tailored porosity can provide broad ion diffusion pathway and low charge-transfer resistance. Meanwhile, seawater was used instead of NaCl for preparing hierarchical porous carbon with good capacitive performance. When evaluated their practical applications, the assembled all-solid-state hybrid supercapacitor delivers a high energy density of 30.6 W h kg −1 at a power density of 600 W kg −1 , and even maintains an energy density of 15.5 W h kg −1 at a power density of 12000 W kg −1 with 86.5% capacity retention after 10,000 cycles. This work is anticipated to open up a new route of using MOFs gel and water-soluble salts for designing hierarchical porous electrode s materials, which pave the way for advanced utilization of MOFs gel and seawater.
研究领域:
材料科学
·
电化学
·
纳米能源
·
功能材料
·
储能技术
✓ 已验证
DOI
高影响因子
NEW CARBON MATERIALS
·
2021
·
IF 1.905
Xu Du,Hui-min Yang,Yan-lan Zhang,Qing-cheng Hu,Song-bo Li,Wen-xiu He
Nanostructured phenolic resin-based carbon aerogels with an extensive network structure are regarded as ideal energy storage materials for supercapacitors. However, the initial bulk form and low capacitance of previously reported porous carbon aerogels are problematic for practical use. Phenolic resin-based porous carbon spheres were synthesized by a simple hydrothermal process using ammonia, ethylenediamine or hexylenediamine as a catalyst. The porous carbon spheres were investigated by SEM, BET, XPS, etc. It was found that the number of ammonium groups, length of the alkyl chain and processing temperature play vital roles in determining the pore structure, size and uniformity of the carbon spheres. NH 4 + is necessary to obtain the carbon spheres and but changing the other parameters has no obvious effect on their crystal structure. The sample prepared at a hydrothermal temperature of 80 °C using ammonia as the catalyst has the highest specific capacitance of 233.8 F g −1 at a current density of 1.0 A g −1 . It has an excellent capacitance retention of 98% after 10,000 charge/discharge cycles at 7 A g −1 , indicating its good cycling stability and rate capability. This result shows that a higher specific surface area, porosity and defect density are probably the crucial factors in improving the electrochemical capacitance.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
高分子化学
·
表面科学
·
物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 5
·3795-3804
·
IF 2.993
Song Lixin,Jing Wanru,Chen Jingjing,Zhang Shouren,Zhu Yuqing,Xiong Jie
The light response range, reusability, and durability of photocatalyst are the key issues for its practical application. To address these problems, the C-doped TiO 2 /carbon nanofibrous (CTCNF) film with incorporation of C-doped TiO 2 nanoparticles into carbon nanofibers was prepared by electrospinning and calcination (pre-oxidation and carbonization). All the obtained CTCNF films exhibited a promising light absorption in ultraviolet–visible region. With optimization of carbonization temperature, the CTCNF film carbonized at 800 °C (CTCNF-800) showed a strongest light absorption. Consequently, the CTCNF-800 possessed a highest photocatalytic degradation efficiency of 94.2% for degradation of rhodamine B. In addition, the CTCNF-800 possessed excellent flexibility and deserved mechanical strength, and hence, the CTCNF-800 could be easily segregated from solution and recycled. Satisfyingly, its degradation efficiency still exceeded 92% after using for six cycles, implying that the CTCNF had excellent reusability and well stability. Besides, the degradation efficiency was over 90% after the CTCNF-800 kept in air without illumination for 1 year, indicating its outstanding durability. The CTCNF film photocatalyst demonstrates tremendous potential in practical application for purification of wastewater.
研究领域:
材料科学
·
环境工程
·
纳米技术
·
光催化
·
废水处理
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Qiang Ru,Xiaoqiu Chen,Juan Li,Lingyun Guo,Shejun Hu
Lamella SnSbCu x /MCMB/carbon composite were prepared by a multi-step synthesis method for high stability and long life lithium ion battery electrodes. The lamella composite were synthesized via co-precipitation method combining with high-speed ball milling and subsequent pyrolysis . The resultant composite are consisted of nano SnSbCu x particles, lamella mesophase carbon microbeads (MCMB, after ball milling) and amorphous carbon coating pyrolyzed from phenolic resin . The lamella MCMB was treated as the inner terrace, which offered efficient electron conducting pathway for connection of nano SnSbCu x particle and pyrolysis carbon. With the increasing of the content of inactive element Cu, the SnSbCu x /MCMB/carbon composite are propitious to improve the cycling performance. When cycled at a constant current of 100 mA g −1 between 0.01 and 2.0 V, the coulombic efficiency of first cycle exceeds 88.45% and the reversible capacity of 100th cycle attains to 485 mAh g −1 (91.4% capacity retention) in SnSbCu 0.5 /MCMB/carbon alloy anodes.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）