从重油中提取的纳米碳片的储钾性能

IF 5.7 3区 材料科学 Q2 Materials Science
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引用次数: 0

摘要

作为石油提炼的副产品,重油具有含碳量高、成本低和可变性大的特点,使其成为钾离子电池(PIB)阳极的有竞争力的前体。然而,重油成分与钾储存性能之间的关系仍不明确。利用含有不同化学组的重油作为碳源,即流体催化裂化浆料(FCCS)、石油沥青(PA)和脱油沥青(DOA),通过熔盐法制备了三种碳纳米片(CNS),并将其用作钾离子电池的阳极。重油的成分决定了薄片厚度、sp3-C/sp2-C 比率和缺陷浓度,从而影响了钾的储存性能。FCCS 中芳香烃含量高,重组分分子含量适中,因此生成的碳纳米片(CNS-FCCS)与其他三种前驱体生成的 CNS 相比,层厚度更小,层间距更大(0.372 nm),褶皱数量更多。这些特点使其具有更快的电荷/离子传输速度、更多的钾储存位点和更好的反应动力学性能。CNS-FCCS 具有出色的 K+ 储存能力(在 0.1 A g-1 条件下循环 100 次后为 248.7 mAh g-1)、较长的循环寿命(在 1.0 A g-1 条件下循环 800 次后为 190.8 mAh g-1)和卓越的速率能力,是该应用领域的最佳材料之一。这项研究揭示了重油成分对碳结构和电化学性能的影响,为设计和开发用于 PIB 的先进重油衍生碳电极提供了指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The potassium storage performance of carbon nanosheets derived from heavy oils
As by-products of petroleum refining, heavy oils are characterized by a high carbon content, low cost and great variability, making them competitive precursors for the anodes of potassium ion batteries (PIBs). However, the relationship between heavy oil composition and potassium storage performance remains unclear. Using heavy oils containing distinct chemical groups as the carbon source, namely fluid catalytic cracking slurry (FCCS), petroleum asphalt (PA) and deoiled asphalt (DOA), three carbon nanosheets (CNS) were prepared through a molten salt method, and used as the anodes for PIBs. The composition of the heavy oil determines the lamellar thicknesses, sp3-C/sp2-C ratio and defect concentration, thereby affecting the potassium storage performance. The high content of aromatic hydrocarbons and moderate amount of heavy component moieties in FCCS produce carbon nanosheets (CNS-FCCS) that have a smaller layer thickness, larger interlayer spacing (0.372 nm), and increased number of folds than in CNS derived from the other three precursors. These features give it faster charge/ion transfer, more potassium storage sites and better reaction kinetics. CNS-FCCS has a remarkable K+ storage capacity (248.7 mAh g−1 after 100 cycles at 0.1 A g−1), long cycle lifespan (190.8 mAh g−1 after 800 cycles at 1.0 A g−1) and excellent rate capability, ranking it among the best materials for this application. This work sheds light on the influence of heavy oil composition on carbon structure and electrochemical performance, and provides guidance for the design and development of advanced heavy oil-derived carbon electrodes for PIBs.
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来源期刊
New Carbon Materials
New Carbon Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
6.10
自引率
8.80%
发文量
3245
审稿时长
5.5 months
期刊介绍: New Carbon Materials is a scholarly journal that publishes original research papers focusing on the physics, chemistry, and technology of organic substances that serve as precursors for creating carbonaceous solids with aromatic or tetrahedral bonding. The scope of materials covered by the journal extends from diamond and graphite to a variety of forms including chars, semicokes, mesophase substances, carbons, carbon fibers, carbynes, fullerenes, and carbon nanotubes. The journal's objective is to showcase the latest research findings and advancements in the areas of formation, structure, properties, behaviors, and technological applications of carbon materials. Additionally, the journal includes papers on the secondary production of new carbon and composite materials, such as carbon-carbon composites, derived from the aforementioned carbons. Research papers on organic substances will be considered for publication only if they have a direct relevance to the resulting carbon materials.
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