JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2021
·
IF 8.067
Ting He,Jiajia Ru,Yutong Feng,Dapeng Bi,Jiansheng Zhang,Feng Gu,Chi Zhang,Jinhu Yang
Rational design of advanced polar hosts with high sulfur loading, facilitated ionic/electronic transport and effectively suppressed shuttling effect has great potential for high performance lithium-sulfur batteries, yet it remains challenging. Here we propose a novel templated spherical coassembly strategy to fabricate the MoS 2 /C hollow spheres as an efficient sulfur host material. The unique hollow structure provides enough interior space for accommodating a substantial amount of sulfur, and effectively suppresses the diffusion of dissolved polysulfides by both physical confinement and chemical adsorption. Moreover, the ionic transport as well as the ability to mitigate volume variation upon cycling is also improved, thereby maximizing the utilization of sulfur. Owing to these merits, when evaluated as a sulfur host for lithium-sulfur batteries, the MoS 2 /C hollow spheres exhibit appealing electrochemical performance with an impressive specific capacity of 1082 mA h g −1 at 0.1 C, excellent rate capability and superior cycling stability with a low fading rate of 0.04% per cycle.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Yan Wang,Xiaochuang Di,Zhao Lu,Xinming Wu
Nowadays, electromagnetic (EM) radiation poses severe environmental pollution and harm to civilian and military life. To this end, it is urgent to synthesize high-efficiency microwave absorbers in terms of composition and structural design. Herein, we reported a unique hybrid nanostructure with Co particles embedded in hollow carbon polyhedron by a series of synthetic steps including carbonization and pyrolysis . Further, the nanoporous carbon (NPC) derived from wheat flour is coated onto the surface of Co@C polyhedrons, forming a special hierarchical structure (Co@C@NPC), which demonstrates outstanding microwave absorption properties due to the hierarchical porous structure, enhanced interfacial polarization, conduction loss, multi-reflection and matched impedance. Typically, with a 10 wt% filler content, the maximum R L of Co@C@NPC reaches −57.2 dB at 9.6 GHz and the corresponding effective bandwidth is 5.7 GHz (from 7.5 to 13.2 GHz) with an absorber thickness of 3 mm. Besides, the filler loading of 10 wt% is much lower than other reported bio-derived absorbers. In short, the hybrid zeolitic imidazolate frameworks offer a novel idea for constructing hollow carbon skeletons and introducing biomass carbon as a green, low cost and renewable material that enhances the dielectric loss and the synergistic effect between permittivity and permeability.
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高影响因子
APPLIED THERMAL ENGINEERING
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2020
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IF 4.725
Tao Wang,Xishan Zhou,Zhao Liu,Jiawei Wang,Yongsheng Zhang,Wei-Ping Pan
As an inorganic phase change material (PCM), CaCl 2 ·6H 2 O is an effective energy storage material because its energy can be transformed around 30 °C through the melting and crystallization. The different compositions of PCM were prepared in order to decrease the phase transition temperature to 20–25 °C and to improve its capability of heat storage and release. MgCl 2 ·6H 2 O was added as a nucleating agent and the composite PCMs (CPCMs) of CaCl 2 ·6H 2 O/MgCl 2 ·6H 2 O binary salt system was prepared. At the same time, SrCl 2 ·6H 2 O was added to reduce the supercooling degree of inorganic PCM. As a thickener, hydroxyethyl cellulose (HEC) was also included to improve the recycling ability. With the application of thermogravimetric analysis and differential scanning calorimeter, the phase transition temperature, thermal properties of CPCMs, supercooling degree and thermal cycle performance were studied by changing the content of each component in the CPCMs. The results demonstrated that the phase transition temperature of PCM with 35% MgCl 2 ·6H 2 O, 5% SrCl 2 ·6H 2 O, 0.5% HEC balanced by CaCl 2 ·6H 2 O was reached to 23 °C. The phase change latent heat of PCM was kept at 130 J/g. The degree of supercooling was kept within 0.7 °C and the recyclability was greatly improved after 100 cycles.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Fanxu Meng,Zhenjie Li,Cheng Lei,Kun Yang,Daohui Lin
Nanoscale zero-valent iron (nZVI) is widely studied for environmental remediation in recent years. However, its easy agglomeration, vulnerable oxidation, and runoff limit its practical application. Herein, iron-based lignin-derived biochar composites (Fe-LBC) with different Fe/C ratios were synthesized using a facile carbothermal reduction method and applied for trichloroethene (TCE) removal from anaerobic water. The synthesized Fe-LBC was equipped with higher specific surface area, more uniform nanoparticles distribution, and higher iron carbide content with the decrease of Fe/C ratio from about 1:5 (Fe-LBC 5 ) to 1:30 (Fe-LBC 30 ). TCE removal by Fe-LBC firstly increased as the Fe/C ratio increased from 1:10 6 to 1:10 3 , and then decreased with the Fe/C ratio further increased to 1:5. The removal efficiency remained largely stable (97.0–98.5%) within the Fe/C ratio range of 1:10 4 -1:30. Fe-LBC 30 (1.0 g L −1 ) could remove 97.4% of TCE (10.4 mg L −1 ), and owned the highest dechlorination efficiency (30.0%). Iron carbides but not Fe 0 could mainly contribute to the dechlorination. The quenching experiment reveals atomic hydrogen (H*) formed under the catalysis of iron carbides, and 1,2-dichloroethene was identified as the main degradation product derived from hydrogenolysis; electrochemical analyses suggest iron carbides could also serve as electron donors to TCE. Moreover, Fe-LBC 30 maintained excellent TCE removal efficiency in various water matrixes and pH range of 3–9, revealing its high application potential in practical groundwater remediation. This work firstly demonstrated the reductive dechlorination action of iron carbides rather than nZVI in iron-biochar hybrid materials, boosting our knowledge and potential application of iron-based materials.
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高影响因子
APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Mengmeng Yang,Liwei Jin,Mingyi He,Zao Yi,Tao Duan,Weitang Yao
Low silicon oxide (SiO) is a promising anode material for lithium and potassium ion batteries due to its high theoretical capacity (~2400 mAh g −1 ) and good cycle performance. However, volume effects and poor intrinsic electronic conductivity during cycling limit its practical application. To meet this challenge, we synthesized SiO x @C (SC) anodes with various carbon contents by ball milling and high-temperature carbonization. The graphite/asphalt coating reduces the volume expansion of SiO and reduces the mechanical stress. When used as a lithium ion battery (LIB) electrode, the SC-2 material retained a lithium storage capacity of 729.5 mAh g −1 after 200 cycles at a current density of 200 mA g −1 . In addition, when used as a potassium ion battery (KIB) electrode, the SC-2 material provides a high capacity with a discharge capacity of 107.0 mAh g −1 after 400 cycles at 200 mAh g −1 and excellent cycle life (after 2000 cycles at 500 mA g −1 , the capacity 80.8 mAh g −1 was retained). The potassium storage mechanism of the SC electrode was analyzed by the simple ex-situ XRD technique. These results show that SC anodes are promising for application as anode materials for LIBs and KIBs.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2020
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IF 6.444
Xueai Li,Wenqi Dong,Can Zhang,Wanchun Guo,Chunsheng Wang,Yingmei Li,Haiyan Wang
Two-dimensional microwave-absorbing materials (MAMs) with abundant preferable interfaces are highly desirable for high-performance microwave absorption. Herein, a leaf-like Fe/C structure, consisting of iron veins interpenetrated in amorphous carbon lamina, was fabricated by reducing a petal-like iron alkoxide in an H 2 /Ar atmosphere. The synthesized leaf-like Fe/C composites dissipate microwaves in an effectively similar process green to leaves absorbing sunlight. First, the unique leaf-like structure enables microwaves to pass into the composites because the 2D amorphous carbon, with its high BET surface area, provide adequate access for microwaves. Then, the incident microwave is attenuated by the distinctly improved dielectric loss caused by enhanced interface polarization and an effective magnetic loss from the natural resonance of iron. Therefore, the leaf- like Fe/C composite shows microwave absorption with a maximum reflection loss of − 59.7 dB, whose effective bandwidth (reflection loss ≤ − 10 dB) covers the whole Ku band and X band with thicknesses of only 1.5 mm and 2.0 mm, respectively.
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高影响因子
Nanoscale Advances
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2021
·Vol. 3
·期 7
·1942-1953
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IF 4.553
Suzhe Liang,Ya-Jun Cheng,Xiaoyan Wang,Zhuijun Xu,Liujia Ma,Hewei Xu,Qing Ji,Xiuxia Zuo,Peter Müller-Buschbaum,Yonggao Xia
Antimony (Sb) has been regarded as one of the most promising anode materials for both lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) and attracted much attention in recent years. Alleviating the volumetric effect of Sb during charge and discharge processes is the key point to promote Sb-based anodes to practical applications. Carbon dioxide (CO2) activation is applied to improve the rate performance of the Sb/C nanohybrid anodes caused by the limited diffusion of Li/Na ions in excessive carbon components. Based on the reaction between CO2 and carbon, CO2 activation can not only reduce the excess carbon content of the Sb/C nanohybrid but also create abundant mesopores inside the carbon matrix, leading to enhanced rate performance. Additionally, CO2 activation is also a fast and facile method, which is perfectly suitable for the fabrication system we proposed. As a result, after CO2 activation, the average capacity of the Sb/C nanohybrid LIB anode is increased by about 18 times (from 9 mA h g−1 to 160 mA h g−1) at a current density of 3300 mA g−1. Moreover, the application of the CO2-activated Sb/C nanohybrid as a SIB anode is also demonstrated, showing good electrochemical performance.
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高影响因子
Nanoscale
·
2020
·Vol. 12
·期 7
·4374-4382
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IF 6.895
Xingmei Guo,Cheng Qian,Xiaohan Wan,Wei Zhang,Haowei Zhu,Junhao Zhang,Hongxun Yang,Shengling Lin,Qinghong Kong,Tongxiang Fan
Streptococcus thermophilus, a Gram-positive (G+) bacterium featuring a teichoic acid-rich cell wall, has been employed as both a phosphorus source and template to synthesize a biomorphic Co2P-Co3O4/rGO/C composite as an efficient electrocatalyst for the oxygen reduction reaction (ORR). Different from the conventional method for the synthesis of phosphides, bio-derivative phosphorus vapor was emitted from the inside out, which facilitated the in situ transformation of the chemically adsorbed Co precursor on the bacteria into Co2P-Co3O4 heterogeneous nanoparticles, which featured a Co2P-rich body and Co3O4-rich surface. Besides, reduced graphene oxide (rGO) was also introduced in the synthetic process to keep Co2P-Co3O4 scattered and further promote the electron transport efficiency. All the Co2P-Co3O4 nanoparticles and rGO sheets were supported on the bacteria-derived carbon substrate with submicron-spherical morphology. The as-obtained Co2P-Co3O4/rGO/C composite exhibited excellent electrocatalytic performance for ORR with onset and half-wave potentials of 0.91 and 0.80 V vs. RHE, respectively. Furthermore, its long-term stability and methanol tolerance were better than those of commercial Pt/C. Thus, this work presents a new strategy of using an interior bio-phosphorus source to obtain heterojunction particles featuring a phosphide-rich body and oxide-rich surface, which may provide some insights for the construction of efficient heterogeneous electrocatalysts.
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高影响因子
ANALYTICA CHIMICA ACTA
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2020
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IF 5.977
Yuehua Guo,Qihang Cao,Qiumei Feng
The detection of a small number of exosomes provides the possibility for early cancer diagnosis and prognosis. Here, a multi-signal amplified electrochemical sensing platform was explored for the ultrasensitive detection of tumor exosomes relying on catalytic hairpin assembly-triggered DNA walker, entropy beacon-based DNA assembly and Ag@C core-shell nanocomposites. In this work, the utilization of Ag@C nanocomposites as electrode interface effectively enhanced functional active sites and electron transfer capability. By designing a target-assisted entropy beacon-based DNA assembly, single exosome initiated the release of multiple special DNA sequences , which could be separated conveniently by magnet and then hybridize with the blocking DNA to liberate swing arm. DNA walker was activated with the assistance of catalytic hairpin assembly, introducing extensive electroactive methylene blue (MB) to electrode surface. Thus, the detection of exosomes was transferred into the measurement of the MB current, with a good liner range from 100 to 75 000 particles/μL. Furthermore, this constructed sensing system displayed acceptable reproducibility, long-term stability, favorable selectivity , and highlighting application potential in real samples.
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高影响因子
MATERIALS & DESIGN
·
2020
·
IF 6.289
Qianqian Zhao,Guo Feng,Feng Jiang,Shanfang Lan,Junhua Chen,Feifei Zhong,Zuzhi Huang,Hui Pan,Jianmin Liu,Qing Hu,Weihui Jiang
A novel recoverable visible-light photocatalyst, amorphous Fe 2 TiO 5 /C composite, was prepared via nonhydrolytic sol-gel method with carbon-containing precursors as in-situ carbon sources. It is demonstrated that the precursors, iron ethoxide and butyl titanate, react to form Fe-O-Ti bonds in gel through a ether elimination reaction and amorphous Fe 2 TiO 5 at 300 °C, which finally crystallizes at 600 °C. The residual organic groups form uniform-doped C. Interestingly, the photocatalytic activity of amorphous Fe 2 TiO 5 /C is distinctly superior to those of its crystalline counterparts without C and P25 (43-fold increase and 12-fold increase, respectively), which is mainly attributed to the incorporation of C (8.17 wt%) and amorphous Fe 2 TiO 5 with a hollow spherical structure and a high BET surface area of 195.5 m 2 /g. Importantly, the photocatalyst can be recovered with a recovery rate of 100% simply by an external magnetic field, making it have promising applications in the wastewater treatment field.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
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IF 3.83
Zhaohuan Wei,Yaqi Ren,Hong Zhao,Minkang Wang,Hui Tang
Alkaline fuel cells are considered as promising energy conversion devices for future application, and oxygen reduction reaction (ORR) catalyst is one of the critical factors in determining fuel cells' performance. However, the application of conventional Pt-based catalysts is limited by its high cost and insufficient reserve. Here we synthesized TiC/C nanofibers as ORR catalyst through electrospinning. The morphology, TiC content, and interface between TiC and carbon in TiC/C nanofibers could be adjusted by changing preparation conditions. The changes in material properties affect the catalytic performance due to the synergistic enhanced effect between TiC and carbon. The best TiC/C sample (TCNFs/C) exhibited the ORR performance with the onset potential, peak potential, peak current density, and charge transfer number of 0.941 V vs. RHE, 0.812 V vs. RHE, 0.742 mA cm −2 , and 3.29, respectively, as well as good catalytic durability and excellent methanol tolerance. The results demonstrate the great research value and application potential of TiC/C nanofibers as ORR catalysts.
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高影响因子
FUEL PROCESSING TECHNOLOGY
·
2020
·
IF 4.982
Xin Gou,Francis Okejiri,Zihao Zhang,Miaomiao Liu,Jixing Liu,Hao Chen,Kequan Chen,Xiuyang Lu,Pingkai Ouyang,Jie Fu
Integration of aqueous-phase reforming of methanol (APRM) into the production of value-added fatty alcohols via hydrogenation of fatty acids is an attractive and efficient process in biomass conversion . Herein, we present tannin-derived carbon-supported monometallic Cu/C, Co/C and bimetallic Cu-Co/C catalysts with different Cu/Co ratios for in situ hydrogenation of lauric acid in a methanol-water hydrothermal system. The catalysts were made by a simple mixture of tannin and the metal salts, followed by pyrolysis in an H 2 atmosphere. Through synergism induced by Cu-Co interactions, the bimetallic Cu-Co/C catalyst with Cu/Co ratio of 1:4 (CuCo 4 /C) exhibits higher catalytic activity than monometallic Cu/C catalyst towards lauric acid conversion, as well as higher selectivity to lauryl alcohol than monometallic Co/C catalyst. The CuCo 4 /C catalyst is composed of metallic Cu, metallic Co, and amorphous carbon , characterized by high surface area (194.5 m 2 /g) and hierarchical structure. The obtained lauryl alcohol yield in the methanol-water hydrothermal system is significantly higher than other alcohol-water systems, namely ethanol, 1-propanol, and isopropanol hydrothermal systems, highlighting its higher generation rate of hydrogen. Also, the effects of process parameters including the quantity of methanol, catalyst loading and reaction time on the conversion of lauric acid were systematically studied and optimized.
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高影响因子
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