JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Miao Zhang,Renzong Hu,Jiangwen Liu,Liuzhang Ouyang,Jun liu,Lichun Yang,Fang Fang,Min Zhu
Red phosphorus attracts significant interest for lithium-ion batteries due to its high theoretical capacity. Nevertheless, its low electronic conductivity and drastic volume change during cycling limit its further applications. In this study, we fabricate a novel AgP 2 /C nanocomposite by facile ball milling. The nanocomposite anode delivers a high reversible capacity of 785 mA h g −1 at 0.5 A g −1 after 100 cycles and an excellent rate capability with a reversible capacity of 605 mA h g −1 at10 A g −1 in half cells. This excellent electrochemical performance is attributed to the uniform dispersion of amorphous carbon and the synergistic effect of intermediate discharge/charge products. In addition, the LiCoO 2 ‖AgP 2 /C full cell exhibits a stable capacity with an operation potential of ∼2.8 V, indicating the commercial potential of this material in high rate lithium-ion batteries.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
COMPOSITE INTERFACES
·
2019
·
IF 2.025
Xueyi Zhu,Shuling Shen,Zhihong Tang,Junhe Yang
Ti3+-doped TiO2@C nanorods were prepared through a facile hydrothermal process. Na2Ti3O7 ultralong nanotubes and glucose were used as TiO2 precursor and carbon (C) source, respectively. During hydrothermal treatment, the hydrolysis of Na2Ti3O7 and polymerization of glucose induced the formation of TiO2 nanorods with a coating of carbon complex. At the same time, a part of Ti4+ was reduced to Ti3+ due to the rich hydroxyl groups in glucose. After calcination, an ultrathin carbon shell was formed on the surface of TiO2 nanorods. In this prepared composite, Ti3+ self-doped TiO2 nanorods work as photosensitizer to harvest solar energy to generate electron-hole pairs, the tight-binding interface between TiO2 nanorods and carbon shell works as electron transportation path, and the ultrathin carbon shell acts as electrons trapped and accumulated site. Photocatalytic test results indicate that Ti3+-doped TiO2@C nanorods exhibit higher activity and stability than TiO2 for photodegradation of methylene blue under visible light.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 43
·23103-23112
·
IF 14.511
Xuqi Lin,Jingguo Gao,Kehua Zhong,Yongcong Huang,Hurong Yao,Yingbin Lin,Yongping Zheng,Zhigao Huang,Jiaxin Li
For high-performance silicon–carbon (Si–C)-based anode materials used in high-energy-density lithium-ion batteries (LIBs), there is an urgent need to rationally construct a stable solid electrolyte interface (SEI) film and load a high proportion of silicon content, which is closely related to the capacity and cycling stability of the electrode. Herein, composites of Fe/Fe3C-modified carbon nanofiber–coated Si nanoparticles (Fe/Fe3C–Si@CNFs) were synthesized via a simple electrospinning method. These composites effectively overcome the volume change effect, poor interfacial compatibility and low conductivity, delivering excellent LIB performance. Tested at 2.0 A g−1, Fe/Fe3C–Si@CNFs provides a high reversible capacity of 956.5 mA h g−1 with a coulombic efficiency of more than 99.5% even after 4000 ultra-long stable cycles. The high conductivity of the Fe/Fe3C embedded in the CNF framework can promote e− transfer and boost the Li+ diffusion kinetics in the electrode. The catalytic activity of Fe/Fe3C helps to enhance the interfacial compatibility, grow a balanced stable SEI film and promote the long-cycle stability of the electrode at room temperature.
研究领域:
材料科学
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储能
·
电化学
·
纳米材料
·
电池技术
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DOI
高影响因子
MATERIALS LETTERS
·
2016
·
IF 2.437
Yurong Ren,Peng Lu,Xiaobing Huang,Jianning Ding,Haiyan Wang,Shibiao Zhou,Yuandao Chen,Xiang Ding
Nanoporous spherical Li 1.95 Na 0.05 FeSiO 4 /C and Li 2 FeSiO 4 /C composites have been synthesized through a spray drying-assisted method. The effect of Na doping on the physicochemical properties of Li 2 FeSiO 4 is extensively investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscope , AC impedance spectroscopy , four-point measurement and galvanostatic charge-discharge testing. It is found that Li 1.95 Na 0.05 FeSiO 4 /C composite exhibits superior rate capability and cycling stability. Remarkably, even rate increases to 10C, a high discharge capacity of 110 mAh g −1 is obtained, and 97.8% of its initial value is retained after 100 cycles at 2C. The excellent electrochemical properties were mainly attributed to enhancement of electronic conductivity and reduction of charge transfer resistance .
研究领域:
材料科学
·
电化学
·
储能
·
锂离子电池
·
纳米材料
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 99
·期 10
·3367-3370
·
IF 2.787
Xiaolin Wu,Linjie Gao,Pascal Roussel,Elhadj Dogheche,Jianglong Wang,Guangsheng Fu,Shufang Wang
Single-phase, c -axis-oriented BiCuSeO thin films have been directly grown on the commercial silicon (001) wafers without any surface pretreatment by using pulsed laser deposition. X-ray diffraction pole figure confirms that the film does not have any ab- plane texture, whereas cross-sectional transmission electron microscopy shows good crystallinity of the film even if there exists an amorphous native oxide layer on the wafers surface. At room temperature, the resistivity of the film is about 14 mΩ cm, which is much lower than that reported for corresponding single crystals as well as polycrystalline bulks. This work demonstrates the possibility of using the available state-of-the-art silicon processing techniques to create BiCuSeO-based thin-film thermoelectric devices.
研究领域:
材料科学
·
薄膜技术
·
热电学
·
凝聚态物理
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Lulu Pang,Haoran Li,Zhong Qi,Yaxin Liu,Yandan Du,Peng Pan,Huayi Li,Jie He,Hong Dong,Yahui Cheng,Rui Zhang,Zhengchun Yang
Nitrite is a widespread contaminant in environmental and food systems, and its excessive intake poses significant risks to human health, creating an urgent need for sensitive and robust detection technologies. The performance of conventional electrochemical sensors is often limited by the limited conductivity, aggregation tendency, and interfacial instability of copper-oxide-based materials. A CuO/Cu 2 O/C composite electrode was developed through controlled thermal treatment, where mixed-valence copper oxides are integrated into a conductive carbon framework to address these intrinsic limitations. The optimized CuO/Cu 2 O/C electrode exhibits outstanding electrocatalytic performance toward nitrite oxidation, delivering a broad linear range (2 μM–5000 μM), high sensitivity (52.32 μA μM −1 cm −2 ), and a low detection limit (0.101 μM). The results indicate that the prepared CuO/Cu 2 O/C composite material promotes charge separation and transfer through the heterojunction interface, utilizing the Cu 2+ /Cu + redox couple to provide abundant active sites. Moreover, the carbon substrate not only improves conductivity, inhibits particle aggregation, and increases the electrochemical active area, but also optimizes the oxidation state of copper to the Cu 2+ /Cu + redox pair. These findings provide a promising materials platform and meaningful guidance for the rational design of copper-oxide-based composites tailored for high-performance electrochemical sensing.
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DOI
高影响因子
Particuology
·
2023
·
IF 3.5
Zixu Shi,Chaoyun Shi,Huili Shi,Binfang He,Guoqiang Qin,Ao Li,Jing Zhu,Jingbo Chen
Silica-based anode material is the most concerned material at present, which has the advantages of good cycle stability, high theoretical specific capacity and abundant reserves. However, silica suffers from inherent low conductivity , severe volume expansion effect and low initial coulombic efficiency, which limits its application in lithium-ion batteries. Nanotubes structure can mitigate the volume expansion during lithiation/delithiation. In this article, silica nanotubes (SNTs) were prepared using carbon nanotubes (CNTs) as a template, and then the uniform carbon layer was coated on their surface by carbonization of citric acid . The hollow structure of nanotubes provides more sites for the insertion of Li + during lithiation and additional channels for Li + migration in the cycles, which improves the electrochemical performance. Conductivity can be enhanced by coating carbon layer. The specific capacity of the composite material is about 650 mAh g −1 at 0.1 A g −1 after 100 cycles. With a specific capacity of 400 mAh g −1 even at 1 A g −1 after 100 cycles. The silica-based material is a competitive anode material for lithium-ion batteries.
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Meiqi Mu,Jing Yu,Zhiqian Yao,Suqiong Xu,Chuicai Rong,Xianke Zhang,Zuzhou Xiong,Xingquan Wang,Xiaokang Li,Jujun Yuan
CeO 2 /Co/C composites have been successfully prepared by a template method. When being applied as electromagnetic (EM) wave absorbers, CeO 2 /Co/C composites exhibit stronger EM wave absorption properties than Co/C and CeO 2 /C composites. The enhanced performance can be attributed to the unique structures of CeO 2 /Co/C composites, in which the synergistic effect of conductance loss, polarization loss together with magnetic loss play an important role for improving the EM wave absorption properties. Additionally, the CeO 2 /Co/C composites own more heterogeneous interfaces and high porosity, which promotes the continuous occurrence of interface polarization and dipole polarization, resulting in increased multiple scattering. The CeO 2 /Co/C composites show a RL min of − 55.02 dB and an EAB of 3.29 GHz at the matching thickness of 2.82 mm. This work provides an effective strategy for constructing CeO 2 /Co/C composites for microwave absorbing material with high performances.
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Jia-Qi Chen,Xu-Xu Ye,Da Zhou,Yan-Xia Chen
Electrochemical reduction is a potential solution to eliminate nitrate in wastewater; however, the poor activity and product selectivity of traditional electrocatalysts impede its large-scale application. Herein, we report a new catalyst of Cu-modified Ru nanoparticles (Cu-modified Ru/C NPs) prepared by underpotential deposition (UPD) of Cu atoms onto Ru NPs, which shows good nitrate reduction kinetics and NH3 selectivity. To unravel the enhancing mechanism, the impact of Cu coverage on nitrate reduction and the formation of possible products/intermediates as well as the competition of side products H2 have been investigated systematically by tracking the reverse oxidation of such species using rotation ring disk electrode (RRDE) combined with cyclic voltammetry. Our results reveal that the Cu-modified Ru/C NPs perform NH3 yield of 23.7 μmol h–1 cm–2 and 95% Faradaic efficiency, which is better than Ru/C NPs (6.0 μmol h–1 cm–2 with Faradaic efficiency of 66%); This enhancement of modified Cu atoms toward nitrate reduction results from synergetic effects: (i) Cu blocks the hydrogen evolution reaction (HER) sites on Ru surface; (ii) Cu accelerates the rate of nitrate reduction to nitrite; (iii) the enhanced nitrite reduction activity of Cu sites on Ru substrate is probably a result of changes in electronic structure of Cu.
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Keru Cao,Fangyu He,Jun Yan,Weiwei Zhu,Yanan Wang,Yuheng Zhang,Biao Zhang,Xiaohua Yu,Qingfeng Shen,Chunxia Liu,Qi Wang
Electrochemical detection techniques are not sensitive in detecting isomers with similar structures and properties due to the disadvantages of some sensors such as instability, poor selectivity and susceptibility to environmental interference. Therefore, calcined metal–organic framework structure (Bi-MOF) was used to prepare its derivative Bi@C nanocomposites, and materials with multiple surface active sites and large specific surface area were developed to improve the current response signal of the detected substance. The morphology and structure of the prepared Bi@C were tested by XRD, SEM and other characterisation means. The electrochemical response of Bi@C nanocomposites was studied using an electrochemical workstation for hydroquinone (HQ) and catechol (CC) electrochemical detection. An electrochemical method was developed for the simultaneous determination of hydroquinone and catechol in a simple and highly selective manner. Differential pulse voltammetry (DPV) was used for simultaneous detection of HQ and CC. The results show that Bi@C electrode can detect isomers with high selectivity. Bi@C was detected in the range of 2–600 μM and 2–800 μM for HQ and CC, respectively, in pH = 7 solution. The detection limits were 0.14 μM and 0.12 μM(S/N = 3), respectively. The sensor is successfully applied to detect HQ and CC of real samples and has low detection limit, good recovery, high selectivity, stability and reproducibility. It provides a new idea for electrochemical detection.
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产品关联
DOI
高影响因子
RARE METALS
·
2023
·Vol. 42
·期 4
·1195-1204
·
IF 8.8
Dong Wei,Zhou Shi-An,Ma Yan,Chi Dian-Jun,Chen Rong,Long Hong-Ming,Chun Tie-Jun,Liu Sheng-Jun,Qian Fu-Ping,Zhang Kui
Designing a heterojunction photocatalyst to improve the separation efficiency of photogenerated electrons and holes is of great significance to improve the hydrogen production efficiency. In this work, we report a rational design to grow ZnIn 2 S 4 on Mo-MOF-derived N-doped C-coated MoO 2 (MOZIS), and it has excellent photocatalytic hydrogen production with triethanolamine (TEOA) as sacrificial agent. N-doped C improves the electron transport efficiency between MoO 2 and ZnIn 2 S 4 . The systematic study shows that MOZIS has good properties to promote the effective separation and transfer of photocatalytic charges, which is attributed to the tight contact interface and good energy band structure between MoO 2 and ZnIn 2 S 4 . The optimized nanocomposites have a high hydrogen production efficiency of 10.89 mmol·g −1 (4 h) under visible light. MOF-derived N-doped C-coated MoO 2 is an effective strategy to improve the photocatalytic hydrogen production efficiency of ZnIn 2 S 4 . Graphical abstract
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产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Bo Dong,Chengji Deng,Jinghui Di,Jun Ding,Qingyou Zhu,Hao Liu,Hongxi Zhu,Chao Yu
The non-isothermal and isothermal oxidation behavior of Al 3 BC 3 powders at 800–1400 °C in the air was studied. The results revealed that the oxidation resistance of Al 3 BC 3 powders was better than that of “Al 8 B 4 C 7 ” powders. At 800–1100 °C, the sintering accelerated the adhesion between the aluminum borate layer and the Al 3 BC 3 core. No micro-crack was observed on both surface and cross-section, thus effectively blocking the diffusion of oxygen and volatilization of reactant gases. The oxidation behavior changed due to the oxidation products growing into a rod shape higher than 1200 °C. The interlocking structure of Al 18 B 4 O 33 micro-rods made the surface of oxidized powder porous. Therefore, the oxygen diffused quickly into Al 3 BC 3 through the porous structure on its surface, leading to rapid oxidation. Jander model could deal with oxidation kinetics and be in good agreement with the experimental data. The calculated apparent activation energy of Al 3 BC 3 powder was equal to 212.76 kJ/mol at 800–1100 °C.
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产品关联
DOI
高影响因子
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