JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Fenglian Tong,Jixi Guo,Yanliang Pan,Huibiao Liu,Yan Lv,Xueyan Wu,Dianzeng Jia,Xiaojuan Zhao,Shengchao Hou
Commercial graphite with low theoretical capacity cannot meet the ever-increasing requirement demands of lithium-ion batteries (LIBs) caused by the rapid development of electric devices. Rationally designed carbon-based nanomaterials can provide a wide range of possibilities to meet the growing requirements of energy storage. Hence, the porous walnut anchored on carbon fibers with reasonable pore structure, N -self doping (10.2 at%) and novel structure and morphology is designed via interaction of inner layer polyethylene oxide and outer layer polyacrylonitrile and polyvinylpyrrolidone during pyrolysis of the obtained precursor, which is fabricated by coaxial electrospinning. As an electrode material, the as-made sample shows a high discharge capacity of 965.3 mA h g −1 at 0.2 A g −1 in the first cycle, retains a capacity of 819.7 mA h g −1 after 500 cycles, and displays excellent cycling stability (475.2 mA h g −1 at 1 A g −1 after 1000 cycles). Moreover, the capacity of the electrode material still keeps 260.5 mA h g −1 at 5 A g −1 after 1000 cycles. Therefore, the obtained sample has a bright application prospect as a high performance anode material for LIBs. Besides, this design idea paves the way for situ N -enriched carbon material with novel structure and morphology by coaxial electrospinning.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
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2024
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IF 12.7
Shasha Wang,Yuli Wei,Rongzhe Wang,Qing Liu,Qing Wang,Shaohua Luo,Yahui Zhang,Shengxue Yan,Pengqing Hou,Xin Liu,Jing Guo,Wenning Mu
Nitrogen-doped carbon is regarded as a promising anode for potassium ion batteries (PIBs) because nitrogen atoms can regulate the structures of carbon and generate abundant active sites. How to improve the nitrogen content in carbon through simple and effective methods remains to be further addressed. In this paper, a carbon material (60NC) with ultrahigh nitrogen content (16 %) was prepared from graphite phase carbon nitride (g-C 3 N 4 ) by a convenient freeze-drying and high-temperature pyrolysis method, assisted by citric acid. When used as an anode for PIBs, 60NC exhibited a superior reversible capacity of 318.1 mAh g −1 after 200 cycles at 0.1 A g −1 . Even at the high current density of 1A g −1 , 60NC maintained a specific capacity of 261.8 mAh g −1 after 1000 cycles. The excellent electrochemical performance of 60NC mainly stems from its abundant K + storage active sites caused by nitrogen doping, large layer spacing, and hierarchical porous structure.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nanoscience and Nanotechnology Letters
·
2020
·Vol. 12
·期 3
·317-323
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IF 1.128
Liu Yong,Wang Tao,Gong Guo,Zhang Yong
Fuel cells have the great prospect in energy storage technology from the perspective of energy conservation and ecological protection. However, oxygen reduction reaction (ORR) always proceeds sluggishly leads to limited performance. Choosing an excellent ORR electrocatalyst is considered
to be an effective strategy. Herein, we have presented an easy synthesis method to prepare highly nitrogen-doped porous carbon nanosheets (HNPC) electrocatalysts. The as-synthesized HNPC electrocatalysts delivered excellent catalytic properties by 4e
– transfer pathway
with extremely few HO2–, due to excellent compositional characteristics (highly N doping) and structural features (porosity). It provides some guidance for the synthesis of excellent electrocatalysts, which will have certain significance for the development of fuel cells.
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
高影响因子
SYNTHETIC METALS
·
2016
·
IF 2.299
Xianbin Liu,Ziping Wu,Yanhong Yin
Chemical doping with heterogeneous atoms is an effective method to improve the intrinsic properties of graphene. In this work, a competitive type of highly nitrogen-doped graphene (HNG) and its composites hybridized with Co 3 O 4 nanoparticles were synthesized via simple pre-mixing followed by a hydrothermal method. The highest nitrogen content achieved was 11.7%, which endowed the graphene with superior electrochemical performance. Co 3 O 4 nanoparticles could be obtained with an optimal size of approximately 80–100 nm and were homogenously anchored on the graphene nanosheets. Because of the synergy between the highly nitrogen-doped graphene and uniform Co 3 O 4 nanoparticles, the HNG/Co 3 O 4 hybrids exhibited enhanced rate capability and cycling stability, which were considerably higher than those of bare HNG and Co 3 O 4 . As the current density increased from 0.2 to 5 A g −1 , 80.6% of the specific capacitance was retained. Moreover, over 84.5% of the original specific capacitance was maintained after cycling 1000 cycles. This study has demonstrated the significance of nitrogen doping on the performance of graphene-based materials for supercapacitor electrodes.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 67
·39076-39081
·
IF 3.049
Chao Lu,Xi Chen
Supercapacitors with high power density and long cycle life have shown great potential in energy storage supply for modern electronic devices. Among the component parts of supercapacitors, electrode materials with high electrical conductivity, large surface area and porosity are critical to the energy storage performances of devices. Here, we report a porous g-C3N4 covered MOF-derived nanocarbon material with large specific surface area and high nitrogen doping level as an electrode material for supercapacitors. The large surface area provides high capacity for ion accommodation during electrochemical processes, and the high nitrogen doping facilitates electron and ion transport with extra pseudocapacitance. The supercapacitor based on the as-synthesized material delivers a high specific capacity of 106 F g−1 at current density of 1 A g−1 as well as good rate capability. Furthermore, the device presents good cycling stability with capacitance retention of 91% even after 10 000 cycles at 1 A g−1 under 0.8 V. This study presents a new insight into the design of nanocomposite materials with high energy storage capability and will accelerate the practical application of supercapacitors in future.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2025
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IF 7.9
Yuchen Li,Muqi Chang,Penghao Chai,Qiulong Guan,Jianghuan Li,Lijie Li,Lixia Bao,Wensheng Deng,Jiong Peng,Xin Li
Enhancing Zn 2+ storage necessitates the meticulous design of carbon-based cathodes with specific attributes, notably substantial nitrogen doping and high surface area. However, synthesizing materials that embody both advantages persists as a considerable obstacle. Herein, we introduce a strategy for synthesizing self-assembled supramolecular crystal framework carbonization-activated high nitrogen doping hierarchical porous carbon (H-NPC) with a specific surface area of 2202.96 m 2 g⁻ 1 and a nitrogen doping level of 12.45 at.%, providing a plethora of physical and chemical adsorption sites for Zn 2+ storage. The resulting H-NPC exhibits a notable capacity of 256.7 mAh g −1 at 0.5 A g −1 , achieving a maximum energy density of 213 Wh kg −1 at 450 W kg −1 power density, alongside an extended service life with 91.4 % capacity retention over 10,000 cycles. Density functional theory calculations reveal the role of high nitrogen doping in enhancing the reversible adsorption/desorption of Zn 2+ , augmenting H-NPC's electrical conductivity, electron density at zincophilic active sites, and reducing the energy barrier for Zn 2+ adsorption. This study emphasizes the crucial role of incorporating large specific surface areas and abundant nitrogen atoms into carbon electrodes with the aim of innovating high-efficiency aqueous zinc ion capacitor systems and provides a novel idea for designing new carbon-based materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Huirong Zhang,Lin Luo,Zixiong Zhao,Yi Shen,Jinglei Cui,Xiaokai Shi,Xiaoliang Han
The production of high-performance activated carbon (AC) is recognized as an essential strategy for the effective utilization of lignin resources. In this work, the N-doped AC was successfully prepared by blending sodium lignosulfonate (SL) and different ratios of FeCl 3 through one-pot strategy. The AC structure evolution and performance were obtained by a series of characterization and tests. The results showed that, during the activation process, FeCl 3 first complexed with urea and catalyzed the depolymerization of SL, and the rapid pore development was mainly caused by the template, including formed FeCl 2 , Na 2 Fe 3 Cl 8 and Na 6 FeCl 8 . The ratio of FeCl 3 /SL adjusts the AC physicochemical texture. AC-3 processed a super total specific surface area and pore volume, respectively up to 2048 m 2 /g and 1.47 cm 3 /g. Meanwhile, AC-2 showed a higher nitrogen content of 11.4 %. The as-prepared AC shows super desulfurization, denitrification and Cr (Ⅵ) removal ability. AC-2 displayed maximum sulfur capacity and NO conversion, up to 199.1 mg/g and 42.4 %. This enhanced performance is primarily attributed to the pore structure induced by FeCl 3 activation, which provides a foundation for adsorption and catalytic processes, further augmented by the increased active sites due to nitrogen doping. AC-3 achieved an extremely high Cr (VI) adsorption capacity, up to 386.2 mg/g, which was primarily attributed to the redox effect of N-containing and O-containing groups on Cr (VI), in addition, the effect of physical adsorption including pore structure is not neglectable. This study highlights the significant potential of environmentally friendly lignin-based porous carbon materials for removing contaminants in both gas and liquid phases.
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
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Runmeng Zhang,Xuzhen Wang,Honghui Bi,Lishen Ai,Yanbing Yuan,Zongbin Zhao,Jieshan Qiu
Zinc-ion hybrid capacitors (ZIHCs) are poised to make a significant impact on the energy storage domain, yet their progress is impeded by the limited number of active sites in existing carbon electrode materials. In this paper, surfactant-mediated electrostatic self-assembly and confined pyrolysis strategy are employed to fabricated nitrogen-doped carbon nanorings (NCNRs) with coal tar pitch as the carbon precursor and g-C3N4 nanorings (g-CNNRs) as both template and nitrogen source. The as-prepared NCNRs possess thin-walled hollow nanostructures with high nitrogen-doping content (∼15 atom %) and a high density of defects (sp3/sp2=0.73). When employed as the positive electrode in ZIHCs, the NCNRs exhibit a high reversible capacity (249 F g–1 at 0.1 A g–1), excellent rate performance (113 F g–1 even at 20.0 A g–1), and ultralong cycle life (90% capacity retention after 20,000 cycles at 1.0 A g–1). This work presents a strategy for the design of novel-structured carbon materials from coal tar pitch toward high-performance ZIHCs.
研究领域:
储能
·
材料科学
·
纳米技术
·
电化学
·
碳材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Yi Wang,Hanyu Liu,Kun Wang,Shuqin Song,Panagiotis Tsiakaras
In the present work, a novel metal-free ORR electrocatalyst, with large specific surface area (2600 m 2 g −1 ), high content of N dopants (3.12 at.%) and 3D cross-linking hierarchically porous structure (abbreviated as LHNHPC) is readily prepared by using a modified classical carbon-aerogel method with NH 3 as the activating agent. Compared with benchmark Pt/C catalyst, it is found that, LHNHPC exhibits similar electrocatalytic activity towards oxygen reduction reaction (ORR), superior durability and excellent methanol tolerance in basic media. The above electrochemical properties of LHNHPC are mainly attributed to the synergistic contribution of its unique hierarchical pore structure, the rich N doping and the large surface area. It can be anticipated that the proposed two-step process could be used for mass production of metal free electrocatalysts for a wide range of electrochemical devices including fuel cells and metal-air batteries.
研究领域:
材料科学
·
电化学
·
能源材料
·
催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）