JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Bin Jiang,Yeru Liang,Xiaoyuan Yu,Gang Yuan,Mingtao Zheng,Yong Xiao,Hanwu Dong,Yingliang Liu,Hang Hu
FeCO 3 has attracted increasing attention as an anode material for lithium-ion batteries (LIBs) due to its high capacity, abundance and low cost. However, the poor electronic conductivity and slow ion diffusion dynamics of FeCO 3 limit its rate performance. To address this issue, a FeCO 3 /nitrogen-doped carbon dot (FeCO 3 /N-CD) composite applied in LIBs is developed by a facile one-step hydrothermal method . It is found that the introduction of N-CD effectively inhibits the crystal growth and stacking of FeCO 3 , leading to the formation of a unique nanorod composite with hierarchical porous structure. Benefiting from the rational structure, the as-prepared FeCO 3 /N-CD composite shows significantly improved electrochemical performances when used as anode materials of LIBs. For example, a stable reversible capacity of 872 mA h g −1 after 460 cycles at a current density of 200 mA g −1 can be achieved, which is much higher than that of the pristine FeCO 3 . This study provides an efficient route to prepare advanced FeCO 3 -based composites for anode materials in high-performance LIBs.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Tingting Zhang,Di Wu,Zhenlei Wang,Guangsen Song,Guozhi Fan,Xinyu Cai,Yunliang Zhao
Excess phosphorus (P) in surface water poses a serious threat to ecological safety. However, current methods for effectively removing low concentrations of phosphorus are complicated and expensive. Herein, we used one-step mechanical activation to enhance the release of alkalinity from carbonates and to stimulate ferrous activity in situ, thus achieving efficient and stable removal of phosphorus at low concentrations. The resultant activated FeCO 3 was demonstrated to be a high-performance material, which can remove more than 92 % of the actual low concentration of phosphorus pollution within 30 min, and the concentration of the effluent steadily met the requirements of Chinese Class I environmental quality standards for surface water (0.02 mg/L). In addition, mechanistic investigation showed that mechanical activation significantly enhanced the reactivity and phosphorus removal performance of MgCO 3 . Moreover, one-step mechanical activation simultaneously stimulates the release of alkaline and ferrous ionic groups from iron-rich FeCO 3 , which can produce highly active trivalent iron oxides in situ, leading to efficient and stable phosphorus removal at low concentrations. The present work provides a new insight and direction for developing high-performance materials to remediate low concentration phosphorus polluted waters.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 15
·12476-12489
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IF 2.779
Wang Xinyang,Wei Shicheng,Liang Yi,Dong Chaofang,Wang Yujiang,Huang Yuwei,Li Linwei,Wang Bo
RGO/Fe 3 O 4 /FeCO 3 -based composite was prepared by a one-step hydrothermal method. The microscopic morphology and structure were studied using analytical techniques including scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The electromagnetic parameters and the wave absorption properties of the composite/paraffin mixture were analyzed by the vector network analyzer. It is divulged that the FeCO 3 spheres, Fe 3 O 4 spheres, and the RGO sheets form a fluffy structure rich in microscopic cavities, as well as a good conductive network through the sphere–sheet and sphere–sphere interlap mechanisms, which significantly improves the absorbing performance of the composite. The composite can achieve a maximum reflection loss of − 37.9 dB at a frequency value of 13.9 GHz with a matching thickness of only 6.8 mm. The matching thickness can be adjusted in the range of 5.2–10.0 mm in order to attain a flexible adjustment of the effective microwave absorption band of 9.9–18.0 GHz. Combined with the first-principles calculations, compositing reduces the electron migration energy barrier and thus improves the charge transferring capability. Meanwhile, the interaction of the different components leads to the formation of a special charge transferring channel and the increase of carrier concentration, which enhances the charge transport, as well as the absorbing capacity of the absorbing material.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2022
·
IF 6.796
Chengwei Zhong,Yinying Jiang,Quanfeng Liu,Xiaoshuang Sun,Jiang Yu
Natural siderite (FeCO 3 ), simulated synthetic siderite and nZVI/FeCO 3 composite were used as green and easily available iron-based catalysts in peroxydisulfate activation for remediating 2-chlorophenol as the target contaminant and this technique can effectively degrade organic pollutants in the soil. The key reaction parameters such as catalysts dosage, oxidant concentration and pH, were investigated to evaluate the catalytic performance of different materials in catalytic systems. The buffering property of natural soil conduced satisfactory degradation performance in a wide pH range (3-10). Both the main non-radical of 1 O 2 and free radicals of SO 4 · − and O H · were evidenced by quenching experiment and electron paramagnetic resonance. The reduction of nZVI on FFC surface not only has the advantage for electronic transfer to promote the circulation of Fe(III) to Fe(II), but also can directly dechlorinate. Furthermore, the intermediates were comprehensively analyzed by GC-MS and a potential removal mechanism of three oxidant system for 2-CP soil degradation was obtained. Briefly, this research provides a new perspective for organic contaminate soil treatment using natural siderite or simulated synthetic siderite as efficient and environmental catalytic material.
研究领域:
环境科学
·
土壤化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）