CHEMISTRY-A EUROPEAN JOURNAL
·
2019
·Vol. 25
·期 10
·2637-2644
·
IF 5.16
Yanqiang Li,Huiyong Huang,Siru Chen,Chao Wang,Tingli Ma
Graphical Doped to reduce : FeN x -decorated carbon nanotubes are prepared by utilizing ZnO nanowires as a sacrificial template and Fe–polydopamine (Fe–PDA) complex as metal and carbon sources (see figure). The evaporation of Zn at high temperature results in a high surface area of the carbon nanotubes, and the FeN x species contribute greatly to the oxygen reduction reaction activity of the catalyst. It is of increasing importance to develop highly active and economical oxygen reduction reaction (ORR) electrocatalysts, which have great significance for the large-scale implementation of various energy conversion systems, including metal–air batteries and fuel cells. Herein, a novel method to synthesize FeN x -decorated carbon nanotubes as a high-efficiency ORR catalyst, by utilizing ZnO nanowires as a sacrificial template and a Fe–polydopamine complex as metal and carbon sources, is reported. The obtained catalyst shows great potential for replacing Pt/C as the ORR catalyst under various pH conditions, from alkaline to acidic electrolytes. The high conductivity, large surface area of the carbon nanotube, and highly active FeN x species contributed greatly to the high performance of the catalyst. The work presented herein paves a new way for the synthesis of 1D porous nanomaterials for a broad range of energy-related applications.
研究领域:
材料科学
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电化学
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能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 8
·6451-6460
·
IF 3.442
Zhang Yixin,Liu Lei,Zhang Lili,Yu Yifeng,Lv Haijun,Chen Aibing
Carbon nanotube (CNT) has been intensively studied as supercapacitor electrode materials due to their high mechanical strength and excellent electrical conductivity. However, CNT with limited accessible surface area has low specific capacitance, which limits its application and development in supercapacitor. Herein, we have designed a thin N-doped porous carbon layer-modified CNT nanocomposite by template-free method. In this process, 3-aminophenol and formaldehyde rapidly self-assemble on the CNT in the presence of cationic surfactant CTAB, forming the composite of 3-aminophenol/formaldehyde (3-AF) resin and CNT. Due to the different polymerization degree of inside 3-AF resin, the soluble 3-AF resin oligomer was removed by acetone to form porous 3-AF resin and CNT@N-doped porous carbon (CNT@N-PC) was obtained by annealing process. The CNT@N-PC exhibited abundant porous structure, high specific surface area of 940 m 2 g −1 , excellent specific capacitance value of 224 F g −1 at 1 A g −1 and good cycle stability, demonstrating its potential as supercapacitor electrode materials.
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 ELECTROANALYTICAL CHEMISTRY
·
2016
·
IF 2.822
Yanmeng Cai,Yue Wang,Xinyu Han,Liwen Zhang,Shichang Xu,Jixiao Wang
The composites of carbon nanotube (CNT) and the conducting polymer polypyrrole (PPy) doped with dodecyl benzene sulfonate (DBS − ) and Cl − were prepared respectively by chemical oxidation method and made into two types of composite electrode (PPy-DBS/CNT and PPy-Cl/CNT) for capacitive deionization (CDI) cell. Enhanced electrochemical performance of the composite electrodes was confirmed by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) test. The results of CV showed that the specific capacitance of PPy/CNT doped with either DBS − or Cl − was about 2.3–2.5 times that of the CNT electrode. And EIS test demonstrated that the charging resistance for both the PPy-DBS/CNT and PPy-Cl/CNT electrodes was dramatically reduced and only about 10% that of the CNT electrode. By pairing the two composite electrodes with CNT electrodes, four cells were assembled to study the effects of electrode assembling patterns on the desalination performance of the CDI process. The results indicated that the CDI cells involving either the PPy-DBS/CNT electrode or the PPy-Cl/CNT electrode, or both of them exhibited much higher electrosorption capacity (from 40.8 to 72.36 mg/g) than that of the CDI cell assembled with two CNT electrodes (about 12.6 mg/g). And the composite electrodes kept good stability and fast regeneration rate after several desalting cycles. Thus, it is believed that the enhanced performance and optimized electrode assembly of the CDI cell should be with the composite electrodes that have the good ability of ion selective adsorption for cations or anions.
研究领域:
材料科学
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环境工程
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电化学
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水处理技术
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功能高分子材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2015
·
IF 2.999
Qiang Ru,Xiong Song,Yudi Mo,Lingyun Guo,Shejun Hu
Carbon nanotubes (CNTs) are adopted to modify ZnCo 2 O 4 (ZCO) electrode, and a novel porous polyhedral structure ZCO/CNTs composites are prepared by a facile and scalable hydrothermal process, and the pure ZCO with cubic structure is also synthesized for comparison. The as-prepared materials are characterized by field emission scanning electron microscopy (FESEM). The results demonstrate that the introduced of CNTs has great effects on the nanostructure and electrochemical performance of the samples. The CNTs among the polyhedral structure ZCO/CNTs composites can provide better mechanical robustness, more contact between Li + and electrodes, and more effective electron transmission than the pure ZCO with cubic structure. When tested as anode materials for lithium ion batteries , the ZCO/CNTs composites exhibit a high initial coulombic efficiency of 83.9%, a high specific capacity of ∼864.6 mAh g −1 at a current rate of 100 mA g −1 after 150 cycles, as well as a good rate capability at elevated current rates, such as, ∼924.3 and ∼605.7 mAh g −1 at current rates of 500 and 2000 mA g −1 , respectively. This work would be meaningful in the preparation of complex oxides/carbon composites with porous nanostructure as anodes for LIBs.
研究领域:
材料科学
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电化学
·
纳米科技
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能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Shiqi Sun,Yanjun Chen,Jun Cheng,Zeyi Tian,Chao Wang,Guangping Wu,Changcheng Liu,Yanzhong Wang,Li Guo
Na 3 V 2 (PO 4 ) 3 (NVP) has gained enormous attentions due to the high capacity and voltage platform. Nevertheless, poor intrinsic electronic conductivities severely restrict the further development. Herein, a feasible strategy to construct unique dimensional gradient structure of the wolfram doped NVP is proposed via a facile sol–gel method. The introduction of W 6+ with the smaller ionic radius parallelized with local V 3+ ions could stabilize the open NASICON structure of NVP and generate vast of beneficial holes to accelerate the electronic transportation. Notably, the wolfram can combine with the superfluous carbon layer and form the new conductive WC phase to further promote the electronic conductivity. Meanwhile, the coated carbon layers and enwrapped CNTs construct an effective conductive framework for accelerated electronic migration. The twining CNTs promote to inhibit the growth of the sintered grains, reducing the particle size to provide shortened pathway for the migration of Na + . Distinctively, the modified Na 2.97 V 2.99 W 0.019 (PO 4 ) 3 /C@CNTs (W0.01-NVP) composite delivers a superior electrochemical performance. Significantly, it can submit a high reversible capability of 112.5 mAh g −1 at 5C with retaining 86% initial capacity over 500 cycles. As for a super high rate of 50C, it reveals an incredible capacity of 92.6 mAh g −1 and remains 84.5 mAh g −1 over 400 cycles, corresponding to a high retention of 91.30%. The superior electrochemical performance is derived from the enhanced crystal structure resulted from wolfram substitution and the beneficial dimensional conductive system consisting of new WC phase, coated carbon layers and enwrapped CNTs.
研究领域:
材料科学
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电化学
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能源存储
·
无机化学
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纳米科技
✓ 已验证
DOI
高影响因子
Journal of Nanomaterials
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2015
·Vol. 2015
·期 1
·371404
·
IF 1.644
Wei-Wen Li,Wei-Ming Ji,Yi Liu,Feng Xing,Yu-Kai Liu
This study aimed to explore the damping property of a cement-based material with carbon nanotube (CNT). In the study, the cement composites with different contents of CNT (0 wt%, 0.033 wt%, 0.066 wt%, and 0.1 wt%) were investigated. Logarithmic Decrement method and Dynamic Mechanical Analysis (DMA) method were utilized to study the damping property of CNT/cement composite. The influences of CNT on pore size distribution and microstructure of composite were analyzed by Mercury Intrusion Porosimetry (MIP) and Scanning Electron Microscopy (SEM), respectively. The experimental results showed that CNT/cement composite presented higher flexural strength index than that of a pure cement paste. Additional CNT could improve the vibration-reduction capacity of cement paste. Furthermore, the experiments proved that CNT could bridge adjacent hydration products and support load transfer within cement matrix, which contributed to the energy dissipation during the loading process.
研究领域:
材料科学
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建筑材料
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复合材料
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土木工程材料
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功能材料
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Hui Chen,Jinfeng Wang,Chenchen Jia,Junpeng Mou,Lei Zhu
For the purpose of increasing the power conversion efficiency (PCE) meanwhile decreasing the cost of dye-sensitized solar cell (DSSC), Cu 2 ZnSnS 4 - multiwall carbon nanotubes (CZTS-MWCNTs) nanohybrid Pt-free counter electrode (CE) was prepared via a facile fabricating route. In brief, CZTS nanoparticles were synthesized by a solvothermal method and the composite film was fabricated by spin coating the aqueous solution of the composite. The short-circuit current density and PCE of the DSSC with CZTS-MWCNTs CE were found to be 16.62 mA cm −2 and 9.04%, respectively. But the corresponding values were 15.42 mA cm −2 and 8.74% for a DSSC with a pure Pt-CE. This is owing to the synergistic effect of the intrinsic superior electrocatalytic activity of the CZTS nanoparticles and highly specific surface area and high electrical conductivity of the MWCNTs . The presence and distribution of CZTS-MWCNTs on the CE were characterized by X-Ray Diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM), respectively. Cyclic voltammetry (CV) and electrochemical impedance spectra (EIS) were examined for confirming the high electrocatalytic efficiency of this nanohybrid system.
研究领域:
材料科学
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能源化学
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纳米技术
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电化学
·
光伏器件
✓ 已验证
DOI
高影响因子
SN Applied Sciences
·
2020
·Vol. 2
·期 7
·1156
·
IF 0
Liu Honghong,Thomas Tiju,Li Rongrong,Shen Hangjia,Wang Jiacheng,Yang Minghui
Lithium sulfur (Li–S) batteries are next general energy storage systems due to their high thereotical energy density, low cost and environmental friendly. Herein, we develop a composite polysulfide mediator based on carbon nanotubes enwrapped by zinc sulfide (CNTs@ZnS) nanoparticles as multifunctional host materials for sulfur cathode. The ZnS nanoparticles is uniformed coating on the outside layer of functionalized carbon nanotubes. The unique structure of CNTs@ZnS ensure the chemical adsorption on ZnS and fast electron transfer from ZnS to carbonnanotubes. The presence of ZnS efficiently alleviates the shuttle effect of soluble lithium polysulfide intermediates and hence offers a mean to further enhancing the reaction activity via sulfophilic property of ZnS and catalytically accelerate the conversion of polysulfides to insoluable Li 2 S. The high conductivity of carbon nanotubes results in rapid electron transfer. The CNTs@ZnS cathode offers an excellent specific capacity of ~ 1003 mAh g −1 after 100 cycles at 0.2C. Furthermore significant cycling performance at 0.2C with 3.1 mg cm −2 sulfur loading for 500 cycles is observed with 0.05% capacitance decay per cycle. The results provide insights to develop high-performance Li–S batteries based on multifunctional host materials.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米科技
·
功能材料
✓ 已验证
DOI
MATERIALS LETTERS
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2016
·
IF 2.437
Yan Fang,Xiaohong Jiang,Lihong Niu,Shujie Wang
Polypyrrole/aligned carbon nanotubes (PPy/ACNTs) core-shell nanotube arrays on metal foil have been fabricated through an electrochemical method. The as-prepared PPy/ACNTs electrode materials with novel nanostructure , which is very conducive to the transmission of electrons and ions, possess greatly improved electrochemical performance. The specific capacitances of PPy/ACNTs electrode materials can reach 505 F/g ( vs. the both mass of PPy and ACNTs) in three-electrode system. In two-electrode system, the specific capacitances of the PPy/ACNTs electrode materials can reach 456 F/g ( vs. the both mass of PPy and ACNTs). The PPy/ACNTs electrode materials also exhibit greatly improved rate capability and superior cycling performance.
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 ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Wanlin Qin,Xianliang Li,Yuchi Zhang,Le Han,Zhijin Cheng,Zhijie Li,Yan Xu
The development of electrocatalysts that show multifunctionality towards efficient sensing and energy applications are of great significance. Herein, we report a rational design of photochemical deposition of Ag nanoparticles (Ag NPs) on ZIF-67-decorated carbon nanotube (Ag NPs/ZIF-67 @CNT) hybrid, which exhibits dual-functional capabilities for both effective enzymeless glucose detection and electrocatalytic water oxidation . The distribution of Ag NPs on the ZIF-67-functionalized CNT can be optimized by adjusting the concentration of Ag + aqueous solution during the light illumination process. The optimized Ag NPs/ZIF-67 @CNT composite showed superior glucose-sensing capability with a low determination limit of 0.46 μM (S/N = 3), high sensitivity of 469.4 μA·mM −1 ·cm −2 , wide linearity detection range (0.010–7.0 mM) and short response time (less than 5 s). Also, the Ag NPs/ZIF-67 @CNT composite acting as potential electrocatalyst possessed an overpotential of 286 mV with a Tafel-slope of 80.75 mV dec −1 at 10 mA·cm −2 for high durability water-oxidation reaction. This work provided a feasible way to prepare Ag NPs decorated ZIF-67/CNT with modulated bifunctional catalytic performances via photochemical reduction strategy, which can also provide effective guidance for designing other multifunctional electrocatalysts .
研究领域:
材料科学
·
电化学
·
生物传感
·
能源催化
·
纳米医学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2018
·
IF 4.732
Chengwei Xu,Wenxia Xie,Xiaodong Si,Jun Zhang,Jiangang Yang
A TiO 2 /MWCNTs/Al 2 O 3 /NF (TiO 2 nanoparticles/multi-walled carbon nanotubes /Al 2 O 3 -modified nickel foams) composite filter was prepared through grown of MWCNTs upon Al 2 O 3 -modified nickel foams using chemical vapor deposition (CVD) method and then coated TiO 2 nanoparticles onto MWCNTs using dip-coating method. The MWCNTs forms a network-like structure on the surface layer of composite filter. The BET surface area of TiO 2 /MWCNTs/Al 2 O 3 /NF composite filter is more than 375 times higher than that of the pristine nickel foam. The degradation performance of oil particles was evaluated. Under optimized reaction conditions, 90% of the oleic acid on the filter was decomposed after 25 h. In addition, the effect of reaction temperature and light intensity were studied. Increased reaction temperature and light intensity were found to significantly improve the degradation rate and restrain the formation of refractory product. Furthermore, a parallel reaction kinetic model was adopted for degradation of oleic acid on the composite filter. The composite filter can reduces the accumulation of oil particles on the filter and the energy consumption of the filter. This approach proposes a new way to treat the cooking fume emission at residential building roofs.
研究领域:
环境科学
·
材料科学
·
化学工程
·
大气污染控制
·
纳米技术
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2013
·
IF 2.915
Bin Zeng,Xiaohua Chen,Xutao Ning,Chuansheng Chen,Aiping Hu,Weina Deng
Carbon nanotubes and reduced graphene oxides (CNTs/rGO) sphere decorated with Cu 2 O, CuO nanoparticles (Cu x O–CNTs/rGO) was successfully synthesized by spray drying and post-calcinating method for the first time. Scanning electron microscopy and transmission electron microscopy observations confirmed that CNTs/rGO formed a spherical micrometer structure and Cu x O nanoparticles were decorated on their surface. The experimental results indicated that this novel architecture enhanced photocatalytic performance with 97.5% decomposition of methyl orange (MO) after 20 min in the presence of H 2 O 2 under visible light irradiation, which was much higher than that of pure Cu x O powders (31.2%).
研究领域:
材料科学
·
纳米科技
·
光催化
·
环境功能材料
·
复合材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）