APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Renquan Guan,Dandan Wang,Yujun Zhang,Chen Liu,Wei Xu,Jiaou Wang,Zhao Zhao,Ming Feng,Qingkun Shang,Zaicheng Sun
Photocatalytic N 2 fixation (PNF) provides a low-cost route to generate ammonia. The poor conversion efficiency from photon to ammonia seriously hinders the step forward because of the low concentration of N 2 molecules. Herein, we demonstrate a photocatalyst with surface oxygen vacancies (Vo) and a F modified surface to facilitate N 2 adsorption and activation on the surface of catalysts. The Vo site promotes the chemical adsorption of N 2 , electron transfer from catalyst to N 2 . F modification switches the TiO 2 surface properties from hydrophilic to aerophilic, thus facilitating the adsorption of N 2 . Meanwhile, the hydrogen reduction reaction (HER) is suppressed, as protons hard to adsorb on F capped surfaces. The optimal NH 3 production rate can reach 206 μmolh −1 g −1 , which is ∼ 9 times higher than that of pure TiO 2 nanoparticles (∼23 μmolh −1 g −1 ). This report provides a potential strategy to overcome mass transfer limitation and achieve a high conversion efficiency in PNF.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
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IF 7.504
Peng Long,Yiyu Feng,Yu Li,Chen Cao,Shuangwen Li,Haoran An,Chengqun Qin,Junkai Han,Wei Feng
Solid-state fluorescent carbon quantum dots (QDs) can be used for the encryption of security information. Controlling the dispersion and aggregation of the QDs is crucial for switching their solid-state fluorescence “on” and “off.” The use of polymers has been proposed to slightly separate the QDs inside aggregates to trigger their fluorescence. However, the complex interactions between the QDs and flexible polymer chains make this process challenging. Here, fluorine-modified carbon nanodots (FCDs) were used in a solution as the printing ink. After printing, the FCDs were aggregated on paper via hydrogen bonds, thereby quenching the fluorescence. After a poly(ethylene glycol) (PEG) treatment, the FCDs exhibited yellow solid-state fluorescence due to an increased interdot spacing. The fluorescence intensity and emission wavelength could be tuned by varying the molecular weight and quantity of PEG used. Finally, we demonstrated a high-resolution encryption and decryption system based on the PEG-triggered fluorescence of FCDs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Zhenjie Wang,Yuwei Guo,Chuliang Shen,Yijun Jiang,Hongjuan Zhang,Ruyi Xie
Superhydrophobic textiles have special applications in many fields such as medical treatment, military protection, oil–water separation, etc. In the large-scale pad–dry–cure process, a large number of polymer binders are often added to improve the superhydrophobic durability, resulting in a significant reduction in air permeability. To address this issue, a low-liquid atomization spray method was adopted to fabricate multi-durable superhydrophobic cotton fabrics using N1,N6-bis(2,3-epoxypropyl)hexane-1,6-diamine, a silica precursor, and fluorine-free hexadecyltrimethoxysilane as the main modifiers. The prepared fabric maintained excellent water repellency even after being subjected various harsh conditions tests such as 2000 cycles of friction, 40 washing cycles, ultrasonic treatment for 120 min, 200 tape peelings, and acid–alkali–salt corrosion for 24 h. The air permeability of the superhydrophobic fabric was measured to be 370.2 L m–2 s–1, which was merely 5% lower than that of the original fabric, indicating that the modified fabric retains satisfactory air permeability. The modified fabric exhibited an excellent self-cleaning effect with respect to various liquids. In addition, the prepared fabric showed good oil–water separation capability for both heavy and light oils. For heavy oil–water mixtures, the fabric sample exhibited a maintenance of 98.13% separation efficiency and a high flux of 18 032 L m–2 h–1 after 10 uses. These findings will help to promote the practical application of low-feed interface modification technology in the production of durable functional textiles.
研究领域:
材料科学
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纺织工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 14
·9354-9363
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IF 12.732
Zheng Si,Baozhao Shi,Jin Huang,Ye Yu,You Han,Jinli Zhang,Wei Li
Nickel-rich layered oxides (LiNixCoyMn1−x−yO2) (x ≥ 0.8, NCM) are intensively developed cathode materials for lithium-ion batteries owing to their high energy and low price, however, their application is impeded by poor cycle stability. Herein we explored a Ti and F co-doped Li(Ni0.8Co0.1Mn0.1)O2 cathode through a solid phase reaction using the precursors of TiO2 and NH4F. Combining the characterization results of XRD, Ar sputtering assisted XPS, HRTEM, in situ XRD, etc, it is illustrated that Ti4+ and F− co-modification can synergistically modulate the lattice parameter and the Ni2+/Li+ mixing degree for the Li(Ni0.8Co0.1Mn0.1)O2 cathode material. Particularly, density functional theory (DFT) calculations demonstrate that Ti and F co-doping is beneficial to form stable crystal structures with a layered phase and rock-salt phase. Ti4+ and F− co-dopants induce the formation of an ultra-thin rock-salt phase on the cathode surface, which provides a protective layer on the nickel-rich cathode surface, so as to enhance the electrochemical performance. The optimal Ti4+ and F− co-doped sample 0.5Ti@0.5F-NCM shows a superior discharge capacity of 202.2 mA h g−1 at 1C and 45 °C, and a capacity retention of 88.1% after 200 cycles, much higher than the retention of 45.2% for NCM. For 0.5Ti@0.5F-NCM, the lithium-ion diffusion coefficients after the 1st and 100th cycles are 2.67 × 10−11 cm2 s−1 and 7.14 × 10−12 cm2 s−1 respectively, larger than those of the pristine NCM (1.37 × 10−11 cm2 s−1 and 4.52 × 10−12 cm2 s−1). The Ti4+ and F− co-doping can suppress the H2–H3 phase change of the cathode during the charge and discharge process and reduce the charge transfer resistance. The results provide a simple and feasible design strategy via cation@anion dopants to boost the electrochemical performance of nickel-rich cathodes for lithium-ion batteries.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Di-Ming Chen,Yin-Ping Zheng,Shao-Ming Fang
The selective separation of C 2 H 2 from C 2 H 4 is a very important process for downstream industrial production, and porous metal-organic frameworks (MOFs) have shown great potential for such an application due to their tunable pore surroundings and adjustable building blocks. In this study, a new microporous MOF formulated as {(Et 2 NH 2 )[In(TBOT)(2,3-FDA)](DEF)(H 2 O) 2 } n ( 1 , H 3 TBOT = 4,4′,4’’-(((2,4,6-trimethylbenzene-1,3,5-triyl)tris(oxy))tris(methylene))tribenzoic acid, 2,3-HFDA = 2,3-difluorobenzoic acid and DEF = N , N -diethylformamide) with 2-fold interpenetrated network and 1D fluorine-decorated pores has been prepared via using an acid-acid mixed-ligand strategy. The activated complex 1 (named as 1a ) demonstrates apparently higher C 2 H 2 uptake than C 2 H 4 around room temperature , resulting in its relative high C 2 H 2 /C 2 H 4 (v:v = 1:99) IAST (Ideal Adsorbed Solution Theory) selectivity of 10.3 at 298 K and 1 bar. Furthermore, the GCMC (grand canonical Monte Carlo) simulation results indicate that the 2,3-FDA moieties serve as preferential binding sites for C 2 H 2 via the multipoint F 2 ⋯H–C C–H⋯F 2 interactions, implying the feasibility of the mixed-ligand approach for building porous MOFs with the targeted applications.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2024
·
IF 4.4
Qianqian Shang,Hongbing Wang,Changjie Kan,Rui Ding,Yankai Li,Shiva Pandeya,Ziliang Li,Mahesh Kumar Joshi
Exfoliation and hetero-element doping are common procedures for band gap engineering and enhancing the photocatalytic properties of g-C3N4. A novel and facile strategy for simultaneous exfoliation and hetero-element doping is still in high demand. Herein, we prepared hydroxide and fluoride doped ultrathin g-C3N4 nanosheets through the single-step solvothermal exfoliation of bulk g-C3N4 (BCN) using varying concentrations of ethanol and hydrofluoric acid (HF). The microscopic and spectroscopic analysis confirmed the doping of hydroxide groups and fluoride groups (HO−/F− groups) into g-C3N4 nanosheets (HF-CNS). The HO− groups are primarily located at the terminal amino groups of the heptazine rings in HF-CNS, while the F− groups are likely incorporated into the g-C3N4 lattice by forming C–F bonds. The UV-vis absorption spectra and DFT calculations showed that the electronic band structure, and hence charge carrier recombination, can be tuned by varying the HF amount during the exfoliation process. BET-specific surface area was increased from 18.65 m2 g−1 for BCN to 159.87 m2 g−1 for HF-CNS. The transient photocurrent increased from 5 μA to 20 μA. HF-CNS significantly improved the photocatalytic degradation of tetracycline, achieving 99% removal in 50 minutes, compared to 20% for BCN. Tetracycline degradation followed pseudo-first-order kinetics, with apparent rate constants (K) increasing from 0.0028 min−1 for BCN to 0.0793 min−1 for HF-CNS, a 30-fold enhancement. The photocatalytic hydrogen evolution for HF-CNS was 11 times higher than that of BCN. The HF-CNS exhibited remarkable stability and reusability, indicating its potential as a promising photocatalyst for green hydrogen production and degradation of organic pollutants.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Zhen Chen,Shipeng Geng,Yawen Wang,Yi Wang,Shuqin Song
H 2 O 2 production by 2 electron water oxidation reaction (2e - WOR) is a promising approach, but still lacks mechanistic studies especially from a dynamic point of view. The interfacial water behavior on the solid/liquid interface is believed to play a crucial role in WOR activity. Here, F modification was used to accommodate the structure and dynamic process of interfacial water on WO 3 surface and boost the 2e- WOR activity. Electrochemical measurement, Raman spectra and computational techniques were used to investigate the mechanism. F modification was proved to guide the dipole moments of interfacial water molecules towards WO 3 surface, meaning more difficult to flip interfacial water molecules to perform the first step of WOR, in turn resulting in easy desorption of HO* and O-O*, thus benefiting for 2 e - WOR. This work paves a novel insight to understand mechanism of 2 e - WOR and rationally design the electrocatalysts for H 2 O 2 production from water.
研究领域:
电化学
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催化材料科学
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理论计算化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2022
·
IF 3.475
Qiwen Jiang,Jialu Liu,Tiantian Qi,Yanhua Liu
The photocatalytic reduction of methylene blue was recognized as an economical and effective way for dye removal. To enhance photocatalytic activity under visible-light condition, fluorine and graphene synergistically modified TiO2 (F-TiO2/rGO) nanocomposites were successfully prepared by sol–gel method. Characterization results showed F ions played an essential role in the formation of TiO2 nanoparticles. Between the fluorine sources selected, NH4F was more optimal than NaF doping on the grounds that the existence of Na+ ion was an inevitable factor for the production of brookite. F-TiO2/rGO nanocomposite obtained by adding 5%at NH4F significantly narrowed the bandgap energy from approximately 3.17 to 2.41 eV. Box–Behnken design was adopted to optimize the MB photo-degradation process by F(5%NH4F)-TiO2/rGO nanocomposites under different reaction conditions. Moreover, the antibacterial behaviour of this novel material was also investigated by Escherichia coli (E. coli) bacteria under visible light. The morphology changes of E. coli cells were directly observed by field emission scanning electron microscope and further confirmed that the excellent sterilization of F-TiO2/rGO nanocomposites resulted from the active species. The outstanding photocatalytic performance and antibacterial behaviour of F-TiO2/rGO nanocomposite was attributed to the synergistic effect of photocatalytic redox reaction and adsorption. These results indicated F(5%NH4F)-TiO2/rGO nanocomposite was a promising antibacterial photo-adsorbent for wastewater treatment improvement.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Light-Science & Applications
·
2025
·Vol. 14
·期 1
·1-9
·
IF 23.4
Liu Nian,Liu Zhengzheng,Huang Yuanlong,Du Peipei,Zhang Xiang,Leng Yuxin,Luo Jiajun,Du Juan,Tang Jiang
Vacuum-deposited perovskite light-emitting diodes (PeLEDs) have demonstrated significant potential for high-color-gamut active-matrix displays. Despite the rapid advance of green PeLEDs, red ones remain a considerable challenge because of the inferior photophysical properties of vacuum-deposited red-light-emitting materials. Here, a rationally designed fluorine-modified phosphine oxide additive was introduced to in-situ passivate vacuum-deposited perovskites. The highly polar 2-F-TPPO incorporated perovskite films demonstrated enhanced photoluminescence quantum yield (PLQY), suppressed defects, and improved crystallinity. When implemented as active layers in PeLEDs, an external quantum efficiency (EQE) of 12.6% with an emission wavelength of 640 nm is achieved, which was 6 times higher compared to the previously reported most efficient vacuum-deposited red PeLEDs (EQE below 2%). Our findings lay the foundations for the further exploration of high-performance vacuum-deposited PeLEDs toward full-color perovskite displays.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）