Materials Today Chemistry
·
2025
·
IF 6.7
Xiaotong Song,Junyuan Zhang,Weiqi Li,Huanying Li,Zhiguo Li,Xiaolong Xu,Changyu Liu,Jianbo Jia
Metal-organic framework (MOF)-derived carbon nanocomposites have been widely applied in electrocatalytic fields due to their simple synthesis, excellent conductivity, and high catalytic activity. In this study, ZIF-67 and MIL-101(Fe) were synthesized via liquid-phase precipitation and solvent thermal methods, respectively. Then, the two kinds of MOFs were ground and calcined with melamine to prepare flower-like carbon nanocomposites. Under the optimal conditions, the oxygen reduction reaction (ORR) onset potential (E onset = 1.019 V vs. reversible hydrogen electrode, RHE) and half-wave potential (E 1/2 = 0.866 V) of this prepared composite are both higher than those of commercial Pt/C catalyst (E onset = 0.971 V, E 1/2 = 0.838 V). The prepared nanocomposite exhibits a lower oxygen evolution reaction (OER) overpotential (η = 338 mV at 10 mA cm −2 ) than RuO 2 (η = 372 mV), demonstrating superior catalytic performance. The prepared nanocomposite achieves simultaneous enhancement in both ORR and OER bifunctional catalytic performances. The power density of a zinc-air battery (ZAB) assembled with the optimal nanocomposite was 2.65 times higher than that of the Pt/C + RuO 2 system. This study establishes a fundamental framework for the rational design of high-performance ORR/OER bifunctional catalysts, while pioneering new avenues for ZAB technology commercialization.
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Dengke Zhao,Ligui Li,Lihong Xie,Ni Zhou,Shaowei Chen
Sulfur- and nitrogen-codoped peapod-like carbon nanotubes are facilely prepared via pyrolyzing Fe- and Co-containing Prussian blue analogues supported on trithiocyanuric acid. Combined studies with X-ray diffraction, X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy measurements reveal the encapsulation of metallic FeCo alloy in such carbon nanotubes with a wall thickness of ca. 2.60 nm. Electrochemical measurements show that sulfur codoping with nitrogen dramatically enhances the catalytic activity towards oxygen reduction reaction compared with that of FeCo alloy encapsulated in N-doped only carbon nanotubes, and the sample prepared at a pyrolysis temperature of 800 °C is the best one among the series, exhibiting a more positive half-wave potential of +0.838 V, nearly 100% enhancement in kinetic current, a higher operation stability and stronger immunity to the negative impacts of fuel crossover than commercial Pt/C catalysts. The remarkable improvement of catalytic activity is ascribed to the intensified charge transfer from encapsulated FeCo alloy nanoparticles to thin walls of CNTs upon the additional sulfur doping besides nitrogen. The present results highlight the importance of deliberate doping and structuring in the development of more efficient catalysts based on metal nanoparticles encapsulated in CNTs for high-performance electrochemical energy devices.
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高影响因子
CHINESE SCIENCE BULLETIN
·
2007
·Vol. 52
·期 2
·194-199
·
IF 0.722
Wu Hua,Zeng XiangQiong,Lu LingBo,Ren TianHui
Two di-n-butyl dithiocarbamate derivatives were easily synthesized. Their tribological performances as lubricating oil additives in rapeseed oil were evaluated using a four-ball machine, and their chemistry of films was analyzed with X-ray absorption near-edge spectroscopy (XANES). The results indicate that the two compounds possess excellent anti-wear property and good load-carrying capacity. According to the XANES results, for the thermal films, the outer surfaces are mainly composed of N, S-containing polymer and ferric sulfate, and the near-surface and the bulk are composed of ferrous sulfate, while for the anti-wear films, the outer surfaces are only composed of ferric sulfate, but the near-surface and the bulk are mainly composed of ferrous sulfate.
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DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 46
·23352-23359
·
IF 7.443
Wuxue Zhao,Sheng Han,Xiaodong Zhuang,Fan Zhang,Yiyong Mai,Xinliang Feng
A new series of B, N-containing cross-linked polymers (PPs-BN) were achieved via Sonogashira cross coupling. These polymers exhibit very high carbon yields of around 70–80% even at 800 °C, which allow them to be efficiently converted to B/N co-doped porous carbons after pyrolysis at high temperature under an inert atmosphere. The materials have been fully characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analyses, nitrogen sorption measurements and X-ray photoelectron spectroscopy, revealing their high contents of boron and nitrogen up to ∼3.21% and ∼5.72%, respectively, as well as porous structures with the largest specific surface area of 291 m2 g−1. Their CO2 capacities reached 3.25 mmol g−1 at 273 K under 1 atm. In addition, the very high selectivity for CO2/CH4 with a ratio of more than 5 : 1 at 298 K renders them applicable for gas separation and purification.
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高影响因子
CARBON
·
2019
·
IF 7.466
Lulu Chai,Linjie Zhang,Xian Wang,Leqiong Xu,Cheng Han,Ting-Ting Li,Yue Hu,Jinjie Qian,Shaoming Huang
The search on low-cost, ultra-stable, and high-performance non-novel metal replacements to the Pt-based catalysts for oxygen reduction reaction (ORR) is of great urgency. Herein, a bottom-up method has been proposed to synthesize unique hollow N-doped carbon spheres (HNCSs) from an initial amorphous coordination polymer (CP) template-assisted route for the first time. HNCSs exhibit competitively comparable high electrocatalytic ORR activity, excellent reaction selectivity , and stronger long-term stability and negligible methanol crossover effect compared to the commercial Pt/C under the alkaline medium . Together with the other two reported carbonaceous ORR catalysts, including SCSs and NGPCs , our HNCSs possess the lowest Tafel slope of 65.7 mV dec −1 which is close to Pt/C (62.6 mV dec −1 ), and show much enhanced ORR activity (J L = 5.34 mA cm −2 ) and stability (Retention = 96.5%, Time = 10 h). This CP-templated route for hollow carbon materials will shed light on a new synthetic strategy to prepare high-performance carbon-based and/or metal-free ORR catalysts.
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高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2013
·Vol. 24
·期 2
·315-320
·
IF 1.174
Yao Zhenxing,Wang Mingquan,Sun Shaohua,Jia Ruibao,Li He
Carbon tetrachloride (CCl 4 ) is a kind of toxic and persistent groundwater contaminant. Considering keeping drinking water safe, a novel kind of N-doped graphene (NGS)-P25 TiO 2 photocatalyst was prepared by a facile one-step hydrothermal method for the removal of CCl 4 from contaminated water. Simultaneously, nitrogen-doping and the reduction of graphene oxide, and loading of P25 were finished during the same process. The photocatalytic efficiency of resulted NGS-P25 nanoparticles was studied for the degradation of CCl 4 . The results indicated that NGS-P25 exhibited the highest photocatalytic activity under UV light irradiation, outperforming graphene-P25, bare P25 or NGS. The effects of NGS-P25 dosage, irradiation time, CCl 4 concentration and pH on CCl 4 photocatalytic degradation efficiency were discussed in detail. Accordingly, the optimum experimental conditions were obtained. Moreover, the high performance photocatalyst of NGS-P25 can be extended to environmental pollution control and remediation towards various pollutants.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 90
·87461-87468
·
IF 3.289
Qing Ge,Dingshuo Lou,Shui Lu,Wei Zhang,Li Zhang,Xinping Wang
Poly(ionic liquid)s (PILs) have promising potential to form assemblies with ordered structures in organic media, but experimental investigation on the detailed aggregation behavior of PILs has seldom been involved. In this study, a series of N-alkyl imidazolium-based PILs with different chemical composition in their n-propanol solution was investigated by conductivity measurements. TEM images indicate that PILs with long alkyl chains exhibit onion-like multilamellar structures. The thermodynamic parameters suggest that aggregation of PILs in their good solvents (n-PrOH) is spontaneous, driven by entropy change associated with a hydrophobic effect. As increasing alkyl chain length from 8 to 16, the contribution of per alkyl chain to ΔGθm for PIL aggregation is found to decrease by more than 2 times. The nonsolvent (H2O) contribution to change of Gibbs free energy as well as critical aggregation concentration (CAC) decrease linearly with the volume fraction of water in mixed solvents, implying that PIL aggregation becomes more favorable with the addition of nonsolvent. The results mentioned above play an important role in understanding the aggregation process of PIL in an organic solvent and developing functional materials with well-ordered structures.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Qianxu Ye,Juanjian Ru,Jinhui Peng,Guo Chen,Ding Wang
Herein, the multiporous MnO/N-doped carbon (MnO/NC) composite based on the abundant and inexpensive electrolytic manganese dioxide were fabricated through a facile microwave-assisted carbonthermal reduction, combined with a subsequent in-situ polymerization of polydopamine onto MnO along with thermal treatment. As an anode material, it retains a reversible capacity of 770.5 mAh g −1 at 300 mA g −1 and high Coulombic efficiency of 99% over 500 cycles, superior than those values of the pure multiporous MnO alone. The impressive performance is attributed to the splendid structure stability contributed by well-connected three-dimensional porous configuration and the enhanced reaction kinetics as well as electrical conductivity incurred by N-doped carbon layer with multiple type nitrogen.
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高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2018
·Vol. 77
·期 5
·1441-1448
·
IF 1.247
Li Yuejin,Shang Xili,Li Changhai,Huang Xiaoming,Zheng Jingjing
Novel visible-light-induced UiO-66/BiOI photocatalysts with a p–n junction structure have been prepared for the first time through a facile hydrothermal method. The prepared photocatalysts were characterized using the powder X-ray diffraction, high resolution transmission electron microscopy, scanning electron microscopy, UV–visible diffuse reflectance spectra, and N 2 adsorption–desorption (Brunauer–Emmett–Teller) techniques respectively. The photodegradation performances of UiO-66/BiOI photocatalysts were evaluated by photodegrading salicylic acid under visible-light irradiation. The UiO-66/BiOI composites displayed much higher photocatalytic efficiencies than pure BiOI under visible light. When the content of UiO-66 was 5.2 wt%, the composite (UiO-66/BiOI-2) has the best photocatalytic activity. Most of the salicylic acid molecules can be degraded in 100 min. The degradation rate of UiO-66/BiOI-2 samples is higher than single BiOI and UiO-66. The enhanced photocatalytic performance of UiO-66/BiOI may be ascribed to the formation of p–n heterojunctions between BiOI and UiO-66, which facilitates the transfer and separation of the photogenerated charge carriers. After recycling of the photocatalyst for five times for the photodegradation of salicylic acid, more than 85% of salicylic acid could still be degraded in the fifth cycle, implying that the as-prepared photocatalysts are highly stable.
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高影响因子
Nanoscale Research Letters
·
2015
·Vol. 10
·期 1
·1-7
·
IF 2.779
Ye Jian,Li Xueliang,Zhao Jianjun,Mei Xuelan,Li Qian
Two-dimensional (2D) material has many advantages including high carrier mobilities and conductivity, high optical transparency, excellent mechanical flexibility, and chemical stability, which made 2D material an ideal material for various optoelectronic devices. Here, we developed a facile method of preparing MoS 2 nanosheets followed by a facile liquid exfoliation method via ethyl cellulose-assisted doping and utilizing a plasma-induced p-doping approach to generate t effectively the partially oxided MoS 2 (p-MoS 2 ) nanosheets from the pristine n-type nanosheets. Moreover, an n-p junction type MoS 2 photodetector device with the built-in potentials to separate the photogenerated charges is able to significantly improved visible light response. We have fabricated photodetector devices consisting of a vertically stacked indium tin oxide (ITO)/pristine n-type MoS 2 nanosheets/p-MoS 2 /Ag structure, which exhibit reasonably good performance illumination, as well as high current values in the range of visible wavelength from 350 to 600 nm. We believe that this work provides important scientific insights for photoelectric response properties of emerging atomically layered 2D materials for photovoltaic and other optoelectronic applications.
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DOI
高影响因子
Frontiers of Materials Science
·
2018
·Vol. 12
·期 3
·214-224
·
IF 1.478
Chen Mengna,Zeng Peiyuan,Zhao Yueying,Fang Zhen
CoP is a candidate lithiumstorage material for its high theoretical capacity. However, large volume variations during the cycling processes haunted its application. In this work, a four-step strategy was developed to synthesize N-doped carbon nanotubes wrapping CoP nanoparticles (CoP@N-CNTs). Integration of nanosized particles and hollow-doped CNTs render the as-prepared CoP@N-CNTs excellent cycling stability with a reversible charge capacity of 648 mA·h·g −1 at 0.2 C after 100 cycles. The present strategy has potential application in the synthesis of phosphide enwrapped in carbon nanotube composites which have potential application in lithium-ion storage and energy conversion.
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Liuyi Yin,Hui Zhao,Guangying Chen,Yongyan Xu,Yongxing Chen,Yongbo Li
Salt-containing vapor-liquid equilibrium for the n-propanol + water system was obtained experimentally at atmospheric pressure using a modified Othmer still. The studied salts include lithium chloride (LiCl), sodium chloride (NaCl), potassium chloride (KCl), potassium bromide(KBr) and potassium iodide (KI). The experimental vapor-liquid equilibrium data was compared with that calculated using the LIFAC model. The average relative deviation between experimental data and the correlation are –0.24%, –1.42%, –0.29%, –1.33% and 0.23% for LiCl, NaCl, KCl, KBr and KI, respectively. The corresponding standard deviations are 2.06%, 2.83%, 2.27%, 2.71%, and 2.11%. From these results, it may be seen that the new experimental data for the vapor-liquid equilibrium of the ternary system (n-propanol + water +salt) and the predictive thermodynamic model LIFAC can be used to estimate the influence of the salts on the VLE of the n-propanol + water system. Furthermore, the effect of different salts on relative volatility was studied.
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