JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jujun Yuan,Xiaofan Li,Jun Liu,Shiyong Zuo,Xiaokang Li,Fangkun Li,Yunfei Gan,Haishan He,Xijun Xu,Xianke Zhang,Junxia Meng
The distinctive pomegranate-like Nb 2 O 5 /Carbon@ N -doped carbon (Nb 2 O 5 /C@NC) composites are fabricated using hydrothermal method integrated with nitrogen doped carbon coating procedure. For the SIBs anode, the Nb 2 O 5 /C@NC composites present superior rate character and sustainable capacity (117 mAh g −1 upon 1000 cycles at 5 A g −1 ). The in-situ X-ray diffraction (XRD) is utilized to research its sodium storage mechanism. Furthermore, for PIBs, the Nb 2 O 5 /C@NC composites present sustainable capacity (81 mAh g −1 upon 1000 cycles at 1 A g −1 ). The outstanding performance of Nb 2 O 5 /C@NC composites is ascribed to its unique architecture, in which Nb 2 O 5 nanocrystals embedded in porous carbon can restrain agglomeration of Nb 2 O 5 nanocrystals, enhance electron/ion diffusion kinetics , and ensure electrolyte accessibility, and moreover, NC shell layer can provide effective active sites and further increase ions/electrons transfer.
研究领域:
材料科学
·
电化学
·
纳米能源材料
·
储能技术
·
先进电池
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xuedong He,Fei Tian,Huawei Song,Chengxin Wang
Multivalent metal batteries serve as crucial complements to lithium-ion batteries. Nevertheless, fluorinated anions designed for energy storage at high voltages readily passivate the metal anodes in common ester electrolytes, particularly for Ca-metal batteries (CMBs). Ca plating/stripping can hardly occur continuously in common fluorinated calcium salt ester electrolytes due to severe corrosion at room temperature. To address the challenging issue, a uniform artificial interface of calcium fluoride nitride nanocrystals (Ca 2 NF) and amorphous organic species is engineered in the top of Ca-metal electrodes. The compact inorganic/organic hybrid solid electrolyte interphase (SEI) layer avoided the direct reaction of Ca-metal and corrosive fluorinated anions, effectively preventing the continuous passivation of Ca-metal and expediting the diffusion kinetics of calcium ions at the interface. Therefore, for the first time, stable Ca plating/stripping at 0.005 mA cm −2 over 420 h in a commercial fluorinated calcium salt ester electrolyte is achieved for the Ca-metal electrode with the protective SEI, far superior to that of mere hours for the pristine Ca-metal. The enhanced reversibility is also substantiated in Ca-metal full batteries with biomass-derived carbon cathode, delivering stable cycling performance. This work underscores the importance of interface and interphase engineering as an effective avenue for advancing the development of CMBs.
研究领域:
电化学
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能源材料
·
界面科学
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储能技术
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无机非金属材料
·
应用化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Wenchao Chen,Xin Liu,Jianghai Wu,Qing Wang,Yahui Zhang,Shengxue Yan,Pengqing Hou,Shaohua Luo
Iron sulfide is a potential anode material for sodium-ion batteries because of its abundant natural resources and high theoretical specific capacity. However, they show poor cycling performance due to the serious volume change of iron sulfide materials during the process of charge and discharge. In this work, Fe 1-x S particles are encapsulated in nitrogen-doped 1D carbon fiber material by an electrospinning/high-temperature vulcanization process. The carbon fiber skeleton effectively stabilized the structure of the material; The heteroelement doped carbon improved the electrical conductivity properties and capacitive sodium storage performance. Owing to the unique structure of nitrogen-doped 1D carbon fiber, the material obtains good cycling stability and rate capability. The optimized Fe 1-x S@ nitrogen-doped carbon fibers (Fe 1-x S@NCFs) material was used as the anode of the sodium-ion batteries and maintained a discharge capacity of 382 mAh g -1 after 100 cycles at 0.1 A g -1 and 330 mAh g -1 after 150 cycles at 1 A g -1 .
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 28
·11697-11710
·
IF 4.5
Zhang Ruiqian,Liu Ling,Meng Qinghan
Low-density aerogels have shown great potential as excellent oil–water separation materials in dealing with the growing problem of marine pollution, but they typically suffer from low oil adsorption capacity, complex process flow, expensive raw materials, and poor recyclability. In this paper, inexpensive industrial raw material melamine was introduced into the framework of graphene aerogels, which can be formed into gels (NGAs) in just one step. High-temperature carbonized nitrogen-doped graphene aerogels (N 0.5 CGAs-2) have the advantages of ultralow density, high porosity, repeatable compressibility, hydrophobicity, and excellent adsorption capacity. In addition, depending on the characteristics of the contaminants, N 0.5 CGAs-2 can be selected for different recycling methods and exhibits excellent reusability in cycling. It has a high application value for solving water pollution problems caused by oil spill accidents and chemical spills.
研究领域:
材料科学
·
环境工程
·
纳米科技
·
化学工程
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高分子科学
·
能源与资源
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Pei-Wen Chen,Kui Li,Yu-Xiang Yu,Wei-De Zhang
Cobalt-doped graphitic carbon nitride (Co CN) was synthesized by one-step thermal polycondensation using cobalt phthalocyanine (CoPc) and melamine as precursors. The π-π interaction between melamine and CoPc promotes cobalt doping into the framework of g-C 3 N 4 . The prepared samples were carefully characterized and the results demonstrated that Co-doped graphitic carbon nitride inhibited the crystal growth of graphitic carbon nitride (CN), leading to larger specific surface area (33.1 m 2 g −1 ) and abundant Co-N x active sites, narrower band gap energy and more efficient separation of photogenerated electrons and holes. 0.46% Co CN exhibited higher hydrogen evolution rate (28.0 μmol h −1 ) under visible light irradiation, which is about 3.0 times of that over the pure CN and about 2.2 times of that over cobalt-doped CN using CoCl 2 ∙ 6H 2 O as a cobalt source. This study provides a valuable strategy to modify CN with enhanced photocatalytic performance.
研究领域:
材料科学
·
光催化
·
能源化学
·
纳米材料
·
半导体物理
·
环境功能材料
·
可持续能源
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yu Zhang,Yong Wang,Maoyun Di,Boye Zhou,Wei Xu,Niandu Wu,Yizhang Wu,Youwei Du,Wei Zhong
Atomically thin 2D carbon nitride sheets (CNs) can improve the photocatalytic performance due to their high specific surface area, exposed active sites, and nano-scaled diffusion path of the charge transferred to surface. However, in practical application, 2D CNs photocatalysts always suffer the low solar absorption. Here, we present a novel approach to achieve the ultrathin 2D CNs photocatalysts with wide spectrum absorption in visible-light range. The new method, i.e. thermal annealing of atomically thin CNs in Se vapor, can dramatically extend the absorption edge of the ultrathin CNs from 418 to 574 nm. Using structural characterization and spin-polarized density functional theory, we identify the loss of the nitrogen atoms at the edges and in situ Se doping into the network of ultrathin CNs, which could change the electronic band structure of the 2D CNs. As a consequence, the ultrathin 2D CNs photocatalyst via Se vapor annealing (Se-CNs) modified by Pt cocatalyst shows a superior photocatalytic hydrogen evolution activity under visible light irradiation. More significantly, the ultrathin Se-CNs photocatalyst also exhibits an impressive photocatalytic hydrogen evolution activity under visible-light irradiation in the absence of Pt cocatalyst. We believe that our study provide a facile and environmentally friendly strategy to realize the utilization of 2D CNs photocatalyst under wide spectrum range of solar radiation to harvest solar energy efficiently, and it can be further applied in various advanced fields, including CO 2 photoreduction, organic photosynthesis, and pollutant controls.
研究领域:
材料科学
·
光催化
·
纳米材料
·
能源化学
·
半导体物理
·
环境功能材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Kuan Wu,Gang Xu,Dengyu Pan,Minghong Wu
Combination of high-capacity and flexibility in electrode materials is crucial for flexible electronics. Recently, red phosphorus (P) has caused increasing focus as a hopeful storage material for lithium storage due to its super-high theoretical capacity and low cost. However, the low conductivity of red P and its large volume change during cycling process lead to reduced electrochemical activity. So far, no effective methods have been developed to construct flexible binder-free electrodes using red P as an active material for high-performance lithium-ion batteries (LIBs). Here, a novel hollow three‐dimensional (3D) internet structure as a flexible high-areal-capacity electrode material was fabricated by confining red P nanoparticles into compact MOF-derived carbon-based composite polyhedrons/carbon nanotube internets. The electrode manifests an excellent lithium storage performance for LIBs with a high discharge capacity of 4.78 mAh cm −2 (1920 mAh g −1 ) at 0.1 mA cm −2 and a good capacity retention of 79.2% at 1 mA cm −2 after 300 cycles (73% and 69% capacity retention at 5 and 10 mA cm −2 after 500 cycles, respectively). The novel flexible anode materials can provide excellent Li + storage performance for flexible electronics applications.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
功能材料
·
先进电池技术
✓ 已验证
DOI
高影响因子
Sustainable Energy & Fuels
·
2019
·Vol. 3
·期 9
·2237-2245
·
IF 4.912
Yulin Chen,Yu Li,Fengnan Yao,Cong Peng,Chen Cao,Yiyu Feng,Wei Feng
Two-dimensional (2D) graphene-based materials are widely applied as electrodes for supercapacitors due to their vast surface area and excellent charge mobility. However, the pursuit of the theoretical capacitance of graphene has lasted besides the improvements of charge/discharge rate and cycling life. In this work, a nitrogen and fluorine co-doped holey graphene hydrogel (NF-HGH) was synthesized by using consecutive solvothermal treatments for creating vacancies on the graphene basal plane and introducing heteroatoms into the graphene framework. The NF-HGH as an electrode for supercapacitors exhibited a remarkable electrochemical performance of 345.4 F g−1 at 1 A g−1 in 6 M KOH electrolyte. In addition, the specific capacitance of the assembled all-solid-state flexible symmetric supercapacitor (SSC) was 67.3 F g−1 at 1 A g−1, with an outstanding long-term cycling stability over 10 000 cycles. The delivered maximum energy and power densities were 7.99 W h kg−1 and 10.08 kW kg−1, respectively. The abundant pyrrolic-N doped at the edge of etched vacancies and the formed semi-ionic C–F bonds around pyrrolic-N were critical for electrochemical developments, which provided a sensational method to construct carbonaceous frameworks for energy storage systems.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
Journal of Macromolecular Science Part B-Physics
·
2024
·
IF 1.2
Jingwen Ren,Jipeng Dou,Long Zhang,Shan He,Yan Qin,Huadong Fu
This work mainly studied the influence of SiC and Si3N4 composite fillers on the ablation performance of silica/phenolic composites. The effect of Si3N4 content on the mechanical and ablative properties of the composites was investigated, and the bridging effect between the two different ceramic fillers was analyzed. The results indicated that the mechanical properties and ablation properties of the composite were improved due to the combined effect of the SiC and Si3N4. When the content of Si3N4 was 36phr, the flexural strength at room temperature was 114.6 MPa, the flexural strength after 1200 °C treatment was 18.38 MPa, and the linear ablation rate was 0.011 mm/s in the 1600 °C oxyacetylene ablation test for 30s, while the flexural strength without Si3N4 at room temperature was 105.4 MPa, the flexural strength after 1200 °C treatment was 10.35 MPa, and linear ablation rate was 0.061 mm/s in the 1600 °C oxyacetylene ablation test for 30s. The bridges between the Si3N4 and SiC ceramic fillers can form SiO2, SiCN and Si2N2O in the high temperature environment, which helps fill the pores on the surface of the composite, forming an effective protective layer structure and improving the high temperature and erosion resistance of the composites.
研究领域:
材料科学
·
复合材料
·
高温材料
·
陶瓷填料
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Jian Xu,Yang Yang,Ziquan Guo,Baofu Hu,Jian Wang,Baoli Du,Bingguo Liu,Haipeng Ji,Carsten Dam-Hansen,Ole B. Jensen
Even though CaAlSiN 3 :Eu 2+ (CASN) is, in many regards, a highly suitable red phosphor that can be used in white light-emitting diodes, it can hardly be used in high-power laser-lighting because of its low saturation-threshold. By using CASN-based composite ceramics, it is possible to increase the threshold but new difficulties appear. These include complex and expensive synthesis, while the saturation-threshold still has room for improvement. In this study, we prepare a CASN/glass composite film , using an industry-friendly blade-coating method. The film has a high internal quantum efficiency of 79%, which suggests low conversion loss. Under 1.17 W blue laser excitation, a high luminous efficacy of 21.0 lm/W can be obtained. More importantly, the composite film shows a record-high saturation-threshold of more than 12.7 W (∼320 W/cm 2 ) blue laser excitation. With these outstanding properties, CASN/glass composite films may open doors towards commercially viable red color converters for high-power laser-lighting applications.
研究领域:
材料科学
·
光学工程
·
纳米技术
·
应用物理
·
能源技术
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 12
·9676-9683
·
IF 3.201
Fengjuan Liu,Yao Jiang,Chuan Fan,Liyan Zhang,Yue Hua,Chunxian Zhang,Ning Song,Yingjie Kong,Hua Wang
Fluorimetric and colorimetric analysis strategies have been developed for simultaneously probing Fe3+ and Fe2+ ions in blood or tap water using nitrogen-doped carbon dots (N-Cdots). Herein, the N-Cdots were prepared using melamine by a neutralization heat reaction one-step synthesis route showing high aqueous solubility and environmental stability. Importantly, unlike common carbon dots (Cdots) that generally display one emission of blue fluorescence, they can display excitation-dependent tunable emissions. Moreover, the bright blue-green fluorescence of N-Cdots could be specifically quenched by Fe3+ or Fe2+ ions simultaneously, showing a color change. Herein, the fluorescent quenching of N-Cdots is thought to result from the aggregation of N-Cdots triggered by the unique coordination interactions between Fe3+ or Fe2+ ions and amine and amide groups of N-Cdots. The developed analysis strategies were employed for the evaluation of the total iron levels in blood or tap water, with a detection limit down to about 5.0 nM, exemplified for Fe3+ ions. These strategies could be promising for use in practical applications for the clinical diagnosis of iron-relative diseases (i.e., anemia and cancers) and environmental monitoring of iron pollution. In addition, this one-step neutralization heat reaction route as a facile green synthesis candidate may be tailored for the fabrication of a variety of Cdots, especially those with doped heteroatoms (i.e., nitrogen) for extensive applications in biomedical and environmental fields.
研究领域:
分析化学
·
生物医学工程
·
环境科学
·
临床检验
·
纳米医学
·
分子诊断
·
毒理学
·
转化医学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2014
·Vol. 29
·期 20
·2473-2482
·
IF 1.815
Yingchang Ke,Hongxu Guo,Dongfang Wang,Jianhua Chen,Wen Weng
The ZrO2 and graphitic carbon nitride (g-C3N4) composite photocatalyst has been prepared by calcination process and hydrothermal treatment. The photocatalyst was characterized by x-ray diffraction, scanning electron microscopy, x-ray photoelectron spectroscopy, UV–vis diffuse reflection spectroscopy, Brunauer–Emmett–Teller and photoluminescence spectra. The photocatalytic activity of the photocatalysts was evaluated by degradation of methylene blue under visible light irradiation. The results showed that the activity of the composite photocatalyst ZrO2/g-C3N4 for photodegradation of MB is much higher than that of either pure g-C3N4 or ZrO2, which is ascribed to the effective electron–hole separation based on the photoluminescence spectra. The •O2 − might be the main active species in MB photodegradation, and the •OH and photogenerated electrons are also partly involved in the process of photocatalytic degradation.
研究领域:
材料科学
·
环境化学
·
光催化
·
纳米材料
·
表面科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）