Journal of Energy Storage
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2024
·
IF 8.9
Jinkui Li,Jiao Li,Zhe Hu,Mingwu Xiang,Kaijiao Duan,Yi Guo,Wei Bai,Xiaofang Liu,Junming Guo
Porous carbon synchronously with high conductivity and abundant porous structure is considered to be an effective sulfur host material for boosting the lithium-storage property in battery fields. Herein, a natural silk cocoon derived in-situ N-doping porous carbon lamella with ultrahigh graphitization degree is prepared by a facile synchronous carbonization and catalysis using the bimetallic mixed salts of FeCl 3 and ZnCl 2 . The pore structure and graphitization degree are easily regulated by changing carbonization temperature to balance the synergistic adsorption and conversion actions toward the polysulfides adhered to porous carbon lamellar. When the carbon lamellar is used to design sulfur cathode, the abundant porous structure not only encapsulates active sulfur, but also facilitates electrolyte infiltration. The shuttle effect of polysulfides can be restrained by the synergistic adsorption of porous structure and N-doping. Especially, the ultrahigh graphitized carbon lamellas provide an excellent conductive network for the favorable redox conversion of polysulfide species during charge/discharge. Owing to the structure merits of the porous carbon lamella prepared at 1000 °C, the corresponding carbon/sulfur composite cathode delivers a first discharge capacity of 807.7 mAh g −1 at 0.2C. Even at a current rate of 1C, the stable long cycling performance of 1000 cycles is still maintained. This high graphitized porous carbon materials will provide potential application in other energy-storage fields.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Xing Li,Lei Xing,Chunyu Zhang,Shudan He,Fanghua Liu,Zhen Chen,Huazhen Chang,Junhua Li
Catalytic solvent regeneration is widely considered a promising solution for addressing the intensive heat duty of amine-based carbon dioxide (CO 2 ) capture. This highly challenging application has motivated researchers to develop excellent catalysts with high activity and durability. In this study, we engineered active and durable Fe − N − C catalyst coated with high-graphitization carbon layers (labeled Phen − Fe − N − C) through a secondary thermal pyrolysis treatment. The multiple graphite layers and atomic metal sties were verified by experimental characterization and coordination structure analysis. The improved graphite layers further enhanced the activity of Fe − N − C sites, providing more acid sites for proton-electron transfer and C − N breaking during solvent regeneration (or CO 2 desorption). Thus, the maximal CO 2 desorption rate increased by 50 % when Fe − N − C was used compared with that of the blank case, and the rate further increased by 27 % when Phen − Fe − N − C was used. After 15 days of hydrothermal testing, the single Fe atom over the spent catalysts presented no significant aggregation or dissolution in the solvent, validating the durability of Phen − Fe − N − C. This work demonstrates a feasible and novel strategy to improve M − N − C materials for efficient and robust CO 2 desorption from amine solvents toward energy-saving CO 2 capture.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2024
·Vol. 43
·期 6
·2730-2738
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IF 9.6
Xue Jin-Hang,Sun Qiu-Hong,Han Cheng,Yang Yuan-Dong,Xu Shao-Jie,Li Qi-Peng,Qian Jin-Jie
Meeting the continuous glucose monitoring requirements of individuals necessitates the research and development of sensors with high sensitivity and stability. In this study, a straightforward strategy was proposed for synthesizing ultra-thin oxygen-rich graphitized carbon nanosheets (denoted as GCS-O). These nanosheets are obtained by calcining a topologically two-dimensional indium-based coordination polymer. Subsequently, the growth of FeNi Prussian blue analogue (PBA) on GCS-O effectively introduces active sites and increases the nitrogen content within the carbonaceous matrix. The resulting FeNi-PBA/GCS-O composite exhibits excellent glucose sensing performance with a broad linear range of 1 to 1300 μmol·L −1 . Meanwhile, it also achieves a high sensitivity of 2496 μA·mmol −1 ·L·cm −2 , a limit of detection of 100 nmol·L −1 (S/N = 3), and commendable long-term durability. The relatively simple synthesis process, exceptional sensitivity, and satisfactory electrochemical sensing performance of FeNi-PBA/GCS-O open up new directions for biosensor applications. Graphical abstract
研究领域:
生物医学工程
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电化学分析
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纳米材料科学
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生物传感器
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糖尿病监测
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转化医学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 26
·12537-12546
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IF 6.97
Jiguo Tu,Junxiang Wang,Shijie Li,Wei-Li Song,Mingyong Wang,Hongmin Zhu,Shuqiang Jiao
Highly efficient strategies for the transformation of amorphous carbon into graphite with high graphitization and crystallinity features have been significantly pursued in recent years; however, critical issues, including high processing temperature, insufficient graphitization, introduction of catalyst impurities, complicated post-purification procedures, and generation of greenhouse gas, still remain in traditional approaches. For significantly addressing these challenges, herein, a highly efficient catalyst-free, eco-friendly and low-temperature electrochemical transformation strategy was proposed for the preparation of highly graphitized porous graphite nanoflakes. Using inert SnO2 as an anode in CaCl2-LiCl molten salts, the graphitization transformation of amorphous carbon materials could be realized at 700 °C, approaching the record in high-efficiency converting amorphous carbon to graphite; moreover, systematical analysis was performed to understand the electrochemical transformation of amorphous carbon into highly graphitized graphite nanoflakes. For extending their valuable applications, the as-prepared graphite nanoflakes were further utilized as cathodes in aluminum-ion batteries, which exhibited significantly promising energy storage performance; moreover, an initial discharge capacity of 63.6 mA h g−1 at a current density of 200 mA g−1 was achieved, which eventually became 55.5 mA h g−1 with a coulombic efficiency of 95.4% after 1000 cycles; thus, these cathodes exhibited stable long-term cycling performance. The combination of low-temperature electrochemical transformation and the subsequent high-performance applications of these nanoflakes in energy storage indicates that the proposed strategy is highly efficient for the transformation and utilization of abundant amorphous carbon resources for the realization of high value-added applications.
研究领域:
材料科学
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电化学
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能量存储
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Bowen Li,Mengfan Pei,Yunpeng Qu,Chang Su,Jinfeng Zhang,Xin Jin,Lin Wang,Xigao Jian,Fangyuan Hu
The development of wearable devices requires flexible batteries that can be bent and folded. However, deficiencies in material flexibility, conductivity, and other aspects can affect the performance of a flexible electrode. One-dimensional nanofibers possess high specific surface area, high conductivity, and a 3D network structure that enables them to buffer stress and strain. Consequently, they hold significant potential in the field of electrochemical energy storage as flexible electrode materials. In this study, we utilized polyvinylpyrrolidone (PVP) as a template to form a supramolecular polymer (PNDS) through hydrogen bonding between 1,4,5,8-naphthalene tetracarboxylic acid (NTCA) and 3,3′-diaminobenzidine (DAB) monomers. Through core–shell electrospinning and carbonization, PNDS precursors were used to prepare polybis(benzimidazobenzophenanthroline-dione) (BBB)-based carbon nanofibers featuring a core–shell structure. The BBB polymer, featuring a continuous aromatic ring structure, undergoes conversion into a highly graphitic carbon skeleton upon carbonization at 1000 °C. This transformation enhances the conductivity of flexible electrodes, improves the current collection effect under high currents, and ensures stability in the charge–discharge cycle. The iron-containing polymers within the shell layer ultimately transform into iron oxide and iron carbide nanoparticles encapsulated within the carbon fibers, compensating for the lower specific capacity characteristic of pure carbon materials. Serving as a SIB flexible anode, the specific capacity can achieve 250 mAh g–1 after 950 cycles at 0.2 A g–1, with negligible attenuation throughout the cycling process. This study demonstrates that BBB-based carbon nanofibers featuring core–shell structures exhibit excellent electrochemical performance while retaining flexibility, presenting clear advantages over traditional electrodes characterized by complicated processes and limited active substance content.
研究领域:
材料科学
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电化学
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纳米技术
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Shuai Chen,Feng Wu,Haolin Wang,Shuang Gao,Jiafu Chen,Zhimin Chen,Jianwei Fu
Ferric oxide (Fe 2 O 3 ) has become one of the most competitive candidates for the next-generation lithium-ion batteries anode materials due to its high theoretical reversible specific capacity (Cs, 1007 mAh g −1 ) and low price. However, the rapid capacity fading and poor rate performance deriving from drastic volume expansion (∼200 %), low Coulombic efficiency (CE), and poor electrical conductivity limit its application in LIBs. Herein, a novel encapsulation structure of Fe 2 O 3 nanoparticles has been developed. Fe 2 O 3 nanoparticles inlaid in the shells of hollow highly graphitized carbon fibers are coated by N-doped graphitized carbon (GF-FeO@NGC) by a catalytic graphitization, oxidation route of Fe-based catalyst. The GF-FeO@NGC electrode shows the first specific discharge/charge capacities of 1355/974 mAh g −1 with high initial Coulombic efficiency (ICE) of 72.0%, and excellent reversibility of lithiation/delithiation reaction. After 200 cycles at 0.1 A g −1 , the GF-FeO@NGC electrode keeps a high reversible Cs of 918 mAh g −1 (retention of 94.3%) with a CE of 99.6%. It is noticeable that the GF-FeO@NGC electrode has good rate performance and robust cycling stability at high current density. After 300 cycles at 2 A g −1 , the Cs retention is up to 97.1% with a CE of 99.7%. These are far superior to those of the GF-FeO (without NGC coating) and the most reported Fe 2 O 3 -based electrode materials. The mechanism behind these phenomena are studied.
研究领域:
材料科学
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电化学
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能源存储
·
纳米技术
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 24
·期 41
·10460-10467
·
IF 5.16
Ruiying Shi,Cuiping Han,Xiaofu Xu,Xianying Qin,Lei Xu,Hongfei Li,Junqin Li,Ching-Ping Wong,Baohua Li
Graphical Highly graphitized : A highly graphitized activated carbon nanofiber (a-PANF) has been obtained by a bottom-up synthesis involving electrospinning of polyacrylonitrile followed by calcination and chemical activation (see figure). The product has a hierarchical porous structure and abundant N-heteroatom doping. The lithium-ion capacitor (LIC) has been regarded as a promising device that combines the merits of lithium-ion batteries and supercapacitors, and that meets the requirements for both high energy and high power density. The development of advanced electrode materials is the key requirement. Herein, we report the bottom-up synthesis of activated carbon nanofiber (a-PANF) with a hierarchical porous structure and a high degree of graphitization. Electrospinning has been employed to prepare an interconnected fiber network with macropores, and ferric acetylacetonate has been introduced as both a mesopore-creating agent and a graphitic catalyst to increase the degree of graphitization. Furthermore, chemical activation enlarges the specific surface area by producing abundant micropores. Half-cell evaluation of the as-prepared a-PANF gave a discharge capacity of 80 mA h g −1 at 0.1 A g −1 within 2–4.5 V and no capacity fading after 1000 cycles at 2 A g −1 , which represents a significant improvement compared to conventional activated carbon (AC). Furthermore, an as-assembled LIC with a-PANF cathode and Fe 3 O 4 anode showed a superior energy density of 124.6 W h kg −1 at a specific power of 93.8 W kg −1 , which remained at 103.7 W h kg −1 at 4687.5 W kg −1 . This indicates promising application potential of a-PANF as an electrode material for efficient energy storage systems.
研究领域:
材料科学
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电化学
·
能源存储
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）