SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Abuduheiremu Awati,Halidan Maimaiti,Shixin Wang,Bo Xu
Photocatalytic synthesis of ammonia is a kind of compelling and challenging nitrogen fixation method. In this paper, we extract the small-sized graphite-like carbon layer in the coal by organic solvent extraction method using HNO3 pretreated coal as a precursor. Then the coal-based carbon nanosheets (CNs) containing with Ca 2+ , Ti 4+ , Fe 2+ , Al 3+ , Si 4+ , C, N, O and other metal/non-metal ions was obtained under the assistance of the ultrasonication. The composite catalyst Ru/CNs was prepared by in situ loading the ruthenium (Ru) nanoparticles reduced from RuCl3·3H2O onto the as prepared CNs. The structure was characterized and the photocatalytic nitrogen fixation into ammonia performance under ambient temperature and atmospheric pressure was studied. The results show that the composite catalyst Ru/CNs with uniform dispersion of Ru nanoparticles on CNs has excellent photocatalytic nitrogen fixation activity, a nd the NH3 yield reaches 221.3 μmol/L after the reaction for 4 h. At the same time, the as prepared catalyst had quite good stability, and the NH3 yield remained substantially unchanged in 5 cycle experiments.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Qiusheng Zhou,Yuan Tian,Mingyuan Wang,Shuangying Lei,Chuanyin Xiong
The earth-abundant, low-cost, and efficient oxygen electrode materials offer a potential opportunity to satisfy the large-scale production and application of metal-air batteries. Herein, a molten salt-assisted strategy is developed to anchor transition metal-based active sites via in-situ confining into porous carbon nanosheet. As a result, a chitosan-based porous nitrogen-doped nanosheet decorated with the well-defined CoN x (CoN x /CPCN) was reported. Both structural characterization and electrocatalytic mechanisms demonstrate a prominent synergetic effect between CoN x and porous nitrogen-doped carbon nanosheets forcefully accelerates the sluggish reaction kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Interestingly, the Zn-air batteries (ZABs) equipped with CoN x /CPCN-900 as an air electrode shows outstanding durability for 750 discharge/charge cycles, a high power density of 189.9 mW cm −2 , and a high gravimetric energy density of 1018.7 mWh g −1 at 10 mA cm −2 . Furthermore, the assembled all-solid cell displays exceptional flexibility and power density (122.2 mW cm −2 ).
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 21
·3770
·
IF 5.719
Ruowei Yi,Yinchao Zhao,Chenguang Liu,Yi Sun,Chun Zhao,Yinqing Li,Li Yang,Cezhou Zhao
The nitrogen-doped MXene carbon nanosheet-nickel (N-M@CNi) powder was successfully prepared by a combined process of electrostatic attraction and annealing strategy, and then applied as the separator coating in lithium–sulfur batteries. The morphology and structure of the N-M@CNi were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), Raman spectrum, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption–desorption method. The strong LiPS adsorption ability and high conductivity are associated with the N-doped carbon nanosheet-Ni modified surface. The modified separator offers the cathode of Li–S cell with greater sulfur utilization, better high-rate adaptability, and more stable cycling performance compared with the pristine separator. At 0.2 C the cell with N-M@CNi separator delivers an initial capacity of 1309 mAh g−1. More importantly, the N-M@CNi separator is able to handle a cathode with 3.18 mg cm−2sulfur loading, delivering a capacity decay rate of 0.043% with a high capacity retention of 95.8%. Therefore, this work may provide a feasible approach to separator modification materials towards improved Li-S cells with improved stability.Keywords:MXene;carbon nanosheets;lithium–sulfur batteries;modified separator
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Qian Ma,Rong Qiang,Yulong Shao,Xiao Yang,Yi Chen,Rui Xue,Fangjie Ren,Yuancheng Ding,Lei Rong,Jingbo Fang,Qing Miao,Zheng Guo
Nowadays, the issue of electromagnetic pollution has become increasingly prominent, underscoring the critical importance of developing high-performance microwave absorbers. This study put forwards the synthesis process of two-dimensional (2D) FeCo/Co 8 FeS 8 /C carbon nanosheets, wherein CoSO 4 and FeCl 3 serve as inorganic salt templates, and dopamine functions as the carbon source. FeCo alloy nanoparticles and Co 8 FeS 8 nanoparticles are loaded on the surface of the carbon layer. 2D structure forms the conductive network, which proves advantages in establishing efficient electronic channels and minimizing conduction losses. The carbon component increases the dielectric constant of the composite and improves its impedance matching, and the FeCo alloy provides a certain ML. The synergistic effect between these components significantly contributes to the exceptional microwave absorption performance of the composites. Accordingly, the minimum reflection loss ( R L min) of FeCo/Co 8 FeS 8 /C composite reaches −47.4 dB, its effective absorption bandwidth (EAB) reaches 5.3 GHz. In particular, CST confirms that radar cross-section reduction value of FeCo/Co 8 FeS 8 /C composite can reach 20.2 dB m 2 in the range of −90° < phi< 90°, indicating a high microwave attenuation ability. The study introduces a novel strategy for advancing the development of two-dimensional carbon-based absorption materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
NEW CARBON MATERIALS
·
2024
·
IF 6.5
Tan Yi,Jun-long Huang,Zong-heng Cen,Yi-wei Ji,Shao-hong Liu
Carbon-based catalysts are promising materials for the electrochemical extraction of uranium from seawater. However, their practical application is often limited by high cost and low catalytic activity. Using low-cost polystyrene sulfonic acid resin and melamine as raw materials, a class of nitrogen and sulfur co-doped carbon nanosheets (CNSs) with high catalytic activity has been developed by a low-temperature hydrothermal treatment and high-temperature carbonization. Because of their high conductivity and high catalytic activity, CNS-based electrodes can catalyze uranyl ions in seawater into easily recoverable Na 2 O(UO 3 ·H 2 O) x precipitates at −2 V, and achieve an extraction capacity of up to 3 923.7 mg g −1 with a uranium removal of 98.1% in uranium-spiked seawater (1×10 3 mg L −1 ). In situ Raman spectroscopy showed that a large number of uranium compounds appeared on the surface of the composite electrode within 40 min of extraction. The electrode also recovered 72.7% of the uranium in natural seawater, demonstrating excellent prospects for this application. This work provides a new approach into the design of low-cost, metal-free electrocatalysts for the efficient uranium extraction from natural seawater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Kangning Liu,Jiliang Ma,Xiaopan Yang,Dongnv Jin,Yancong Li,Gaojie Jiao,Shuangquan Yao,Shaolong Sun,Runcang Sun
Photocatalytic biorefinery catches an ocean of attention because of its environmental friendliness. It is widely known that photocatalytic performance of TiO 2 is poor due to the wide bandgap and sluggish electron kinetics. Herein, biochar nanosheet and anatase TiO 2 (denoted as a- TiO 2 @MC) were combined to accelerate the charge separation/transfer and narrow the bandgap of TiO 2 , which is proved by UPS and Mott-Schottky plot analysis. With improved electron kinetics, comes excellent photocatalytic performance, which gave great yield of xylonic acid (52.26%) and lactic acid (49.22%). Furthermore, h + ,·OH, and 1 O 2 exerted positive effects on the synthesis of biomass-derived organic acids, in which the h + plays the major role in the biorefinery over a- TiO 2 @MC, whereas the·O 2 - is not. 1000-fold scale-up experiment indicated that 69.1% of the photocatalytic performance was achieved when compared with the similar conditions irradiated by visible light. This work provides an efficient photocatalytic biorefinery via a facile and low-cost way.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
NEW CARBON MATERIALS
·
2024
·
IF 6.5
Qing-shan Zhao,Qin-lian Liu,Yi-wen Li,Tian Ji,Yu-yue Yao,Yi-kun Zhao,Wei Deng,Han Hu,Ming-bo Wu
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, sp 3 -C/sp 2 -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.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Siyue He,Ningxuan Xue,Guanjie Lin,Yiyang Chen,Xinyu Gai,Yalin Yu,Fengling Liu,Zhaobing Guo,Pengxiang Qiu
Nowadays, organic contaminants have posed a considerable threat to the natural environment. Ferrate (Fe (VI)) is an environmentally friendly oxidant for decomposing organic contaminants in water. In this study, Co modified N-doped carbon nanosheets were prepared to enhance phenol degradation by Fe (VI) under alkaline conditions. Also, the properties, mechanism and transformation pathways were investigated. Co/NC-1000 significantly accelerated Fe(VI) activation, resulting in phenol degradation to be 1.5–4 times faster than with Fe(VI) alone, achieving 92 % removal within 75 seconds. Also, •OH is the essential active oxidizing species for the degradation of phenol in the Fe (VI)-Co/NC-1000 group, followed by 1 O 2 and Fe(V)/Fe(IV). Moreover, the catalyst remained stable over five cycles, making the Fe(VI)-Co/NC system a promising method for efficient water treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2022
·Vol. 132
·期 18
·
IF 2.877
Zheng Xiaochun,Ren Shoutian,Gai Qixiao,Wang Yidi,Liu Wenjun
Various defects of nanocomposites inevitably bring some harmful effects on their photoelectric performance, especially considering that interface defects seriously hinder the carrier interfacial transfer. Here, the interface optimization can be realized between graphitic carbon nitride (C 3 N 4 ) and CoP co-catalyst by the introduction of good conductive carbon nanosheets (CNs). As a result, the defect density of synthesized C 3 N 4 /CNs/CoP is reduced to 1.40 × 10 12 cm −3 from 2.55 × 10 12 cm −3 of C 3 N 4 /CoP, and its interface impedance is correspondingly reduced to 34% of that of C 3 N 4 /CoP. Therefore, the optimal H 2 evolution rate of 5.26 mmol g −1 h −1 and apparent quantum efficiency of 9.27% at 420 nm are realized, which are 4.8 and 8.1 times that of C 3 N 4 /CoP photocatalyst in the absence of CNs, respectively. This work provides a general solution to reduce defect density and carrier transfer resistance in nanocomposites by the introduction of a highly conductive buffer layer.
研究领域:
材料科学
·
光催化
·
能源科学
✓ 已验证
DOI
高影响因子
Carbon Letters
·
2025
·
IF 5.8
Kong Xiangyu,Zhang Xinyang,Zhang Jie,Wang Dewei
Aqueous zinc–iodine batteries (AZIBs) are gaining attention for their ability to store and convert electrical energy. Nevertheless, their performance is hindered by the continual migration of polyiodides towards the zinc anodes, leading to undesirable side reactions, diminished coulombic efficiency, and compromised cycling stability. Traditional carbon materials have proven inadequate in resolving these challenges, mainly due to their limited iodine capacity and weak binding forces. Herein, we explore the use of porous carbon nanosheets (PCNSs) synthesized via the “Pharaoh’s Serpent” reaction as cathode electrodes in AZIBs without pre-load iodine. The PCNSs, characterized by their nanosheet structure and expansive specific surface area, not only facilitate a shorter diffusion path for rapid electrolyte infiltration but also provide numerous sites for ion adsorption and capacitive storage, markedly improving the efficacy of electrochemical reactions and ion migration rates. Utilizing the synthesized PCNSs as the cathode electrode in AZIBs, a specific capacity of 296 mAh g −1 was achieved at 0.3 A g −1 . Even when the current density increased to 30 A g −1 , a specific capacity of 144 mAh g −1 was still attained, with a capacity retention ratio of up to 48.6%, which is competitive with that of supercapacitors. In addition, the AZIBs demonstrated impressive cycling stability, retaining 103% of their capacity after 10,000 cycles, and a notable energy density of 266.4 Wh kg −1 based on the cathode material. These findings significantly broaden the application of carbon materials in AZIBs research, emphasizing their potential in advancing AZIB technology.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Shiyuan Zhu,Peng Liu,Qiongyu Zhou,Qianjun Deng,Yuanyuan Li,Jiacheng Wang,Zuo He,Changchun Tian,Xiaofen Wang
Zn coating is a typical anti-corrosion coating for carbon steel. Considering the sacrificial nature of Zn coating, it is essential to enhance the corrosion resistance for the long-term performance in the practical application. In this work, two-dimensional carbon nanoplatelets (2D-CNs) with nanometer thickness (∼100 nm) and ultra-large lateral size (10–40 μm) and Mn element have been successfully co-deposited with Zn onto low carbon steel by a simple electrodeposition method. Results show that the Zn-Mn/2D-CNs composite coating is composed of Zn phase, ZnMn 3 phase and a small number of 2D-CNs. The Zn-Mn/2D-CNs composite coating exhibits a modified surface quality with ultrafine grains and smaller roughness (Ra = 176 nm, Rq = 131 nm) when compared with that of Zn coatings (Ra = 798 nm, Rq = 684 nm). Besides, the inert 2D-CNs within the composite coating can act as the corrosion barriers. Therefore, the Zn-Mn/2D-CNs composite coating has excellent anti-corrosion performance, owning the lowest corrosion current densities i corr (9.2 μA cm −2 ) and maximum coating resistance R coat (1.2 kΩ·cm −2 ) and charge transfer resistance R ct (3.5 kΩ·cm −2 ), associated with its modified microstructure, Mn element with passivation property, and 2D-CNs barriers. These results demonstrate the desirable potentiality of inert 2D carbon materials in the electrodeposition of Zn-based coating for improving the corrosion resistance.
研究领域:
材料科学
·
防腐蚀工程
✓ 已验证
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2020
·
IF 2.65
Yahui Mo,Juan Du,Haijun Lv,Yue Zhang,Aibing Chen
Due to the characteristics of thin thickness, rich active sites and short diffusion distance, the carbon nanosheets have been widely used as electrodes for energy storage in supercapacitors . Herein, N-doped mesoporous carbon nanosheets (N-MCS) were prepared by using cheap mica powder as template and resorcinol-formaldehyde (RF) resin as carbon precursor. The ethyl orthosilicate (TEOS) was introduces as porogen to create rich mesopores and to increase surface area. The ethylenediamine can be used not only as catalyst for TEOS hydrolysis and RF resin polymerization, but also as nitrogen dopant . The N-MCS faithfully replicated the template morphology, exhibiting sheet-like morphology, porous and N-doping characteristics, which can effectively improve the electrochemical performance .
研究领域:
材料科学
·
能源存储
✓ 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）