INORGANIC CHEMISTRY COMMUNICATIONS
·
2019
·
IF 1.795
Yanjie Zhou,Wei Wei,Hua Su,Wei Wang
Developing a sensitive and reliable method for accurate determination of H 2 is of great importance for effective and safe utilization of H 2 in various conditions. A fluorescence (FL) assay for H 2 detection was proposed in the present work. It relied on the fact that Pd/C nanocomposites catalyzed fluorogenic conversion of weakly-FL resazurin (RZR) into highly-FL resorufin (RSR) was triggered by H 2 under ambient condition. This method possessed a limit of detection (LOD) as low as 0.06% volume concentration of H 2 in air, far below 4% that is the generally recognized as the lower explosion limit of H 2 -air mixture. A high selectivity to H 2 over O 2 , N 2 , Ar and CO 2 as well as broad linear response range from 0.2% to 80% made this method promising for H 2 sensing in a variety of circumstances. Most importantly, the developed method was able to detect practical H 2 atmosphere (2% H 2 in air) with high reliability under simple operation.
研究领域:
化学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
BIOELECTROCHEMISTRY
·
2021
·
IF 5.373
Rui Li,Huanru Liang,Mingfang Zhu,Mushen Lai,Shumei Wang,Hongwu Zhang,Hongqing Ye,Rongkun Zhu,Wenhao Zhang
A highly sensitive electrochemical sensor for the simultaneous dual signal determination of dopamine (DA), uric acid (UA) and glucose (Glu) has been obtained using nanocomposites based on the copper and cerium bimetallic nanoparticles and carbon nanomaterials of graphene and single-walled carbon nanotubes in the presence of Tween 20 (GR-SWCNT-Ce-Cu-Tween 20) modified glassy carbon electrode. The surface morphology of the nanocomposites was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD), and the electrochemical behavior of the sensor was investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) with potassium ferricyanide as probe. In the coexistence system of DA, UA and Glu, three clear and well-isolated voltammetric peaks were obtained by CV and differential pulse voltammetry (DPV), and oxidation peak currents of DA and UA are positively correlated with their concentrations respectively, while the peak current of Glu is negatively correlated with its concentration. Linearity was obtained in the ranges of 0.1–100 µM for dopamine, 0.08–100 µM for uric acid and 1–1000 µM for glucose with DPV, and the detection limits (S/N = 3) of 0.0072 µM, 0.0063 µM, and 0.095 µM for DA, UA and Glu, respectively. The method was successfully applied to the determination of DA, UA and Glu in blood serum samples, which provided a reference for further sensor research.
研究领域:
分析化学
·
电化学传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Select
·
2021
·Vol. 2
·期 9
·1770-1778
·
IF 0
Xiaoyan Wang,Axel Funke,Ya-Jun Cheng,Fang Song,Shanshan Yin,Suzhe Liang,Xiuxia Zuo,Jie Gao,Peter Müller-Buschbaum,Yonggao Xia
Continuous fast pyrolysis is developed for in situ synthesis of ultra-small metal oxide nanoparticles embedded into three-dimensional macroporous carbon matrix as demonstrated by the TiO 2 /carbon nanohybrid. The TiO 2 nanoparticles with the average size of 4.6 nm ± 0.6 nm are uniformly distributed in the in situ generated macroporous carbon matrix. When evaluated as an anode in a lithium-ion battery, the macroporous TiO 2 /C nanohybrid exhibits a reversible capacity of 483 mAh g –1 after 500 cycles at a current density of 67 mA g –1 , which is 3.6 times higher than that of the TiO 2 /C calcined in a conventional batchwise way. Besides, the capacity retains 93 mAh g –1 at a high current density of 670 mA g –1 . It reveals that the continuous fast pyrolysis is an efficient method to fabricate carbon composition based metal oxides as lithium-ion battery anode materials.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 26
·15803-15813
·
IF 10.7
Huiling Wang,Qiang Li,Jing Chen,Hongpeng Jia
Resource utilization of carbon dioxide (CO2) is an effective strategy to mitigate global warming and achieve carbon neutrality and peak carbon goals. It is well known that different preparation methods affect the catalytic performance of catalysts. Herein, we designed an efficient Ru–ZrO2/C catalyst for photothermal catalytic CO2 reduction by pretreating UiO-66 in a N2 atmosphere and then loading Ru species. Compared to the reference sample of Ru/ZrO2 obtained by calcining UiO-66 in an air atmosphere, Ru–ZrO2/C exhibits much superior catalytic activity under full-spectrum light irradiation with a methane yield of 504.1 mmol g−1 h−1 and selectivity of 98.9%, respectively. In addition, the catalytic performance of Ru–ZrO2/C for photothermal CO2 methanation remains stable without obvious reduction in a 24 hour continuous test. The physicochemical characterization studies of Ru–ZrO2/C determine that the remarkable heat resistance, effective light-heat conversion ability, abundant oxygen vacancies, low-valence Ru, and good CO2 adsorption properties are responsible for the enhanced performance of photothermal CO2 hydrogenation. This work expands the application of MOFs as precursors and provides an effective guide for designing highly efficient photothermal catalysts for solar fuel production.
研究领域:
材料科学
·
环境科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Ya’nan Zhu,Peng Liu,Mingyong Wang,Wenjing Ning,Yong Zhou,Xudong Zhao,Xiaoyang Liu
The synthesis and preparation of supercapacitor cathode materials is one of the important ways to achieve the increase of the energy density of supercapacitors. CoMoO4 is a commonly used cathode material, but its own conductivity is poor, however, carbon can make up for this shortcoming of poor conductivity. In this paper, soluble starch with high solubility and uniform dispersion was used as the carbon source, and CoMoO4/carbon flower-like nanocomposites (CCMO) containing surface flocculants were successfully synthesized by a two-step hydrothermal reaction and applied as the cathode for supercapacitors, which showed excellent electrochemical properties. In order to determine the electrochemical properties of the prepared CCMO, it was tested in a three-electrode system. The test results demonstrate that the CCMO-3 electrode prepared under the condition of a quality ratio of CoMoO4 to soluble starch of 1:1 demonstrated the best electrochemical performance, with a specific capacitance of 415F g–1. After 15000 cycles at a current density of 10 A g–1, its specific capacitance remained at 87.5% of the initial reversible capacity. The supercapacitor device (CCMO//AC ASC) prepared with CCMO-3 and activated carbon, as both positive and negative electrodes, has an energy density of 12.44 Wh kg–1 under a power density of 799.71 W kg–1. At a current density of 5 A g–1, it maintains 75% of its initial capacity after 10000 cycles. The excellent electrochemical performance of CCMO-3 shows its application potential in energy storage devices.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Quanhui Hou,Jinhui Wang,Yang Zhou,Peng Jiang,Yuting Li,Zhao Ding,Qianyang Wang,Yonglian Xiong
Developing sustainable catalysts for magnesium-based hydrogen storage systems is crucial for advancing clean energy technologies. Here, we report a facile synthesis strategy for Co/C nanocomposites using renewable sugarcane bagasse as a carbon precursor, achieving uniform dispersion of Co nanoparticles (<200 nm) within a hierarchically porous carbon matrix. The optimized MgH 2 +10 wt% Co/C composite exhibits dramatically enhanced hydrogen storage performance, with a reduction in dehydrogenation onset temperature from 330.4 °C to 209.4 °C and a 26 % decrease in apparent activation energy. The composite achieves rapid hydrogen uptake (6.2 wt% within 10 min at 150 °C) and excellent cycling stability (6.28 wt% after 10 cycles at 300 °C). Mechanistic studies reveal that the superior performance originates from the synergistic effects between the in-situ formed CoMg 2 /CoMg 2 H 5 phases acting as "hydrogen pumps" and the porous carbon framework providing efficient pathways for mass/heat transfer. This work not only demonstrates an effective approach for developing high-performance hydrogen storage materials from renewable resources but also provides fundamental insights into the rational design of sustainable energy materials.
研究领域:
材料科学
·
能源科学
·
可持续发展
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2019
·
IF 1.293
Jianglin Xu,Yaping Zhu,Yan Sun,Anjian Xie
In this report, the porous Fe 3 O 4 /C nanocomposites were successfully synthesized by using ferrocene as raw material and dilute nitric acid as solvent via extremely convenient and low-cost one-step calcining method. The formation of porous structure resulted from the aggregation and assembly of numerous nanoparticles. The experimental results show that the crystallinities, morphologies and electrochemical performance of samples were affected by the calcining temperature and carbon content. As an anode for lithium-ion batteries (LIBs), the Fe 3 O 4 /C nanocomposites obtained at calcination temperature of 500 ∘ C (Fe 3 O 4 /C-a500) exhibited remarkable initial specific discharge capacity of 1418 mA h g − 1 and a reversible capacity retention of 721 mA h g − 1 after 100 cycles at the current density of 100 mA g − 1 . The excellent properties can be attributed to the high theoretical capacity of Fe 3 O 4 , the high conductivity of carbon and especially the porous structure, which offered more sites for the storage and insertion of Li ions. Even at the current density of 1000 mA h g − 1 , the reversible capacity of Fe 3 O 4 /C-a500 can be up to 291 mA h g − 1 , indicating the prepared typical nanocomposite presented excellent electrochemical performances and lithium storage capacity, which may be a promising candidate as the anode material for LIBs.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 44
·期 6
·4426-4437
·
IF 3.741
Fangyan Cui,Wenyi Wang,Caini Liu,Xingyu Chen,Ning Li
Summary One-dimensional (1D) sodium ligninsulfonate functionalized carbon nanotubes (SCNT), two-dimensional (2D) graphene oxide (GO), and three-dimensional (3D) zirconium-based metal-organic frameworks (UiO-66) are self-assembled as filler materials for proton-exchange membranes (PEMs) because of their potential for extending proton transport pathways. Herein, UiO-66-SCNT and UiO-66-SCNT@GO were prepared by a facile solvothermal synthesis and then the nanohybrid chitosan (CS) PEMs were fabricated via solution casting. The hybrid PEMs with higher ion exchange capacity than the pure CS membrane displayed higher proton conductivity and selectivity. The proton conductivity of nanohybrid membrane doped with 7 wt% UiO-66-SCNT@GO (CS/U-S@GO-7) was enhanced to 64 mS cm −1 at 70°C. Simultaneously, the selectivity was reached 19.4 × 10 4 S s cm −3 and was much higher than the pristine CS membrane (0.13 × 10 3 S s cm −3 ). Moreover, the mechanical properties of all composite membranes were significantly enhanced compared with that of the pure CS membrane. The results showed that our research provided a valuable strategy for designing high-performance CS-based PEMs in direct methanol fuel cell (DMFC). Highlights A simple and facile solvothermal synthesis was used to prepare UiO-66-SCNT@GO. UiO-66-SCNT@GO was introduced into chitosan (CS) matrix to optimize proton transport channels. CS-based hybrid membranes exhibit high proton conductivity and selectivity. CS-based hybrid membranes show low methanol permeability.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2017
·Vol. 24
·期 9
·2555-2563
·
IF 2.062
Zhang Qingtang,Yan Chao,Guo Junhong,Wang Xiaomei
Mesoporous Li 2 FeSiO 4 /C nanocomposites (LFS-FNS and LFS-NS) were prepared from fumed nano silica (FNS) and nano silica (NS) through facile solid-state reactions, respectively. XRD analysis indicates that the crystalline structures of LFS-FNS and LFS-NS are indexed to monoclinic Li 2 FeSiO 4 of P2 1 . SEM results prove that the particle size of LFS-FNS and FNS (25~40 nm) is smaller than that of LFS-NS and NS, revealing the particle size of Li 2 FeSiO 4 /C nanocomposites can be tuned by choosing different silica. TEM further indicates Li 2 FeSiO 4 nanoparticles are uniformly dispersed in the amorphous carbon networking of LFS-FNS. Pore structure analysis indicates the external surface areas of LFS-FNS as well as LFS-NS are 51.4 and 36.1 m 2 g −1 , indicating the pore properties of mesoporous Li 2 FeSiO 4 /C nanocomposites can be controlled by using different silica as silicon resource. The reduced particle size and high external surface area shorten the lithium-ion diffusion path and make LFS-FNS possess better electrochemical performance over LFS-NS. The discharge capacity of LFS-FNS is as high as 172 mA h g −1 at 0.1 C.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Xiaoyan Wang,Yonggao Xia,Xiuxia Zuo,Simon J. Schaper,Shanshan Yin,Qing Ji,Suzhe Liang,Zhaohui Yang,Senlin Xia,Ying Xiao,Jin Zhu,Peter Müller-Buschbaum,Ya-Jun Cheng
TiO 2 /SiO x /carbon nanohybrid consisting of super-small sized TiO 2 and SiO x nanoparticles is in situ formed within the in situ formed carbon matrix using difunctional methacrylate monomers as solvent and carbon source. The relative composition of TiO 2 and SiO x is systematically tuned by varying the feeding mass ratio of the precursors (TEOS/TTIP) and HF etching treatment after the carbonization process. The super-small sized TiO 2 and SiO x nanoparticles are well intermixed with each other and homogeneously dispersed throughout the carbon matrix, where a good control over crystallinity, morphology, and microstructure of the nanohybrids is achieved. Synergistic effects are demonstrated from both TiO 2 and SiO x regarding the increased reversible capacity from the SiO x phase and maintenance of good cyclic stability by the TiO 2 component when being used in lithium-ion batteries. A good balance is achieved in terms of reversible capacity, capacity retention, and rate performance in the TiO 2 /SiO 2 /C nanohybrid prepared with the TEOS/TTIP mass ratio of 1.0. The reversible capacities are improved by around two times compared to the SiO x free sample with a good capacity retention of 78 %, which exhibits good rate capability at the current densities up to 3350 mA g −1 as well.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yanqin Wang,Huagao Wang,Jinhong Ye,Liyi Shi,Xin Feng
Magnetic quantum dot (QD)-like CoFe alloy@C nanocomposites derived from ZnCo-MOF using low-dimensional carbon as carriers for electromagnetic wave (EMW) absorption were successfully synthesized by in situ growth and pyrolysis. The resulting CoFe@C nanocomposites were homogeneously conjoined with different carbon supports such as two-dimensional (2D) reduced graphene oxide (rGO) and one-dimensional (1D) carbon nanotubes (CNT). Results indicated EMW absorption properties of CoFe@C were enhanced by introduction of rGO and CNT as carbon hosts for the construction of conductive networks due to the excellent impedance matching and electromagnetic attenuation. The rGO-supported CoFe@C composites annealed at 900 °C (rGO-CoFe@C-900) revealed a minimum reflection loss (RL min ) of −36.08 dB at the sample thickness of 3.0 mm and an effective bandwidth (RL < −10 dB) of 5.17 GHz at 3.5 m. Moreover, the CNT-supported CoFe@C nanocomposites pyrolyzed at 900 °C (CNT-CoFe@C-900) exhibited optimum EMW absorption performances due to the continuous 3D conductive networks, RL min of −40.00 dB with the thickness of 3.0 mm, and effective absorption bandwidth reached 5.62 GHz with a thickness of 2.0 mm. In particular, the specific reflection loss values of the resulting nanocomposites significantly preceded that of the reported similar dielectric-magnetic hybrids. In view of the superior EMW absorption properties, the as-fabricated low-dimensional carbon-supported magnetic quantum dot-like (QD-like) CoFe alloy@C composites will be utilized as ideal candidates for high-efficient EMW absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2019
·
IF 7.466
Yuhan Li,Faxiang Qin,Le Quan,Huijie Wei,Yang Luo,Huan Wang,Hua-Xin Peng
Interface constitutes a significant volume fraction in nanocomposites , and it requires the ability to tune and tailor interfaces to tap the full potential of nanocomposites. However, the development and optimization of nanocomposites is currently restricted by the limited exploration and utilization of interfaces at different length scales. In this research, we have designed and introduced a relatively large-scale vertical interphase into carbon nanocomposites, in which the dielectric response and dispersion features in microwave frequency range are successfully adjusted. A remarkable relaxation process has been observed in vertical-interphase nanocomposites, showing sensitivity to both filler loading and the discrepancy in polarization ability across the interphase. Together with our analyses on dielectric spectra and the relaxation process, it is suggested that the intrinsic effect of vertical interphase lies in its ability to constrain and localize heterogeneous charges under external fields. Following this logic, systematic research is presented in this article affording to realize tunable frequency-dependent dielectric functionality by means of vertical interphase engineering. Overall, this study provides a novel method to utilize interfacial effects rationally. The research approach demonstrated here has great potential in developing microwave dielectric nanocomposites and devices with targeted or unique performance such as tunable broadband absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）