Journal of Physical Chemistry C
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2021
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IF 4.126
Joshua Adedeji Bolarin,Zhao Zhang,Hujun Cao,Zhi Li,Teng He,Ping Chen
This paper seeks to present notable insights into the catalytic behavior of a ferroelectric BaTiO3 nanomaterial at the boundary plane in the separation of MgH2 starting from 185 °C. The synergy between mechanical milling and enhanced electronic distribution at the surface of BaTiO3 aided magnesium to a remarkable absorption of 4.5 wt % H2 at room temperature under 30 bar within 20 h. The composite released H2 ∼ 5.7 wt % in 15 min at 310 °C and ∼5.1 wt % in 90 min at 250 °C. The lowered activation energy of decomposition was calculated to be ∼60 kJ/mol with a decomposition enthalpy of 72.3 kJ/mol-H2. The composite reversibly produced ∼5.7 wt % H2 across 20 cycles in less than 120 h at 300 °C. As revealed by detailed experimental results, the interplay between +4 and +3 states of titanium at “111” twin boundaries of BaTiO3, and the formation of oxygen vacancies, play an important role in improving the sorption kinetics and the reversibility of Mg/MgH2. Meanwhile, the anomalous ferroelectric character of the +2 state of barium around Ti–O and Mg after milling of BaTiO3 is also believed to slightly enhance MgH2 desorption enthalpy via a chemisorption process. Our findings have brought MgH2 a few steps closer to practical applications.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 2
·1479
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IF 5.6
Shuxian Weng,Guixin Zhang,Yun Hu,Caiying Bo,Fei Song,Guodong Feng,Lihong Hu,Yonghong Zhou,Puyou Jia
Lignin degradation is an effective means of achieving the high-value application of lignin, but degradation usually requires the use of high temperatures and harsh reaction-conditions. This study describes a green, mild approach for the degradation of lignin, in which chlorine dioxide (ClO2) was used for the oxidative degradation of lignin (IL) in an acidic aqueous suspension at room temperature. The optimal process conditions were: 30 mL of ClO2solution (2.5 mg·L−1), pH 4.5 and 3 h. The FT-IR, NMR (1H NMR, 2D-HSQC and31P NMR), XPS and GPC analyses indicated that lignin could be degraded by ClO2relatively well at room temperature, to form quinones and muconic acids. Additionally, DIL was reduced to substances with a high phenolic-hydroxyl (OH) content (RDIL) under the presence of NaBH4, which further confirmed the composition of DIL and which can be applied to the development of lignin-based phenolic resins, providing a reference for the further modification as well as the utilization of DIL.Keywords:chlorine dioxide;lignin;room temperature;degradation
研究领域:
化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Xiaoqian Meng,Rui Gao,Ming Zheng,Xin Zhou,Xianfa Zhang,Xiaoli Cheng,Yingming Xu,Shan Gao,Lihua Huo
Real-time monitoring of chlorine gas (Cl 2 ) with a strong irritating odor is an indispensable means of avoiding its contamination of the air and harm to the body. To achieve this purpose, a novel gas-sensitive material capable of detecting low concentrations of Cl 2 at near room temperature is developed in this paper. ZIF-8 with a kinetic diameter of 3.4 Å in the designed ZnO@ZIF-8 composites is able to sieve gas molecules with different kinetic diameters, enabling effective improvement of the selectivity of the gas-sensitive materials. In addition, the porous structure of ZIF-8 can provide more reactive sites, which is conducive to improving gas adsorption capacity and providing of channels for gas diffusion. In this study, ZnO@ZIF-8 heterojunction composites are prepared by combining the advantages of ZnO and ZIF-8, which provides a new method for real-time monitoring of low concentrations of Cl 2 , and also has potential practical applications in fields such as environmental monitoring and industrial safety.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Zhihua Liu,Dan Han,Lulu Liu,Donghui Li,Xiaomei Han,Yi Chen,Xiaoru Liu,Kai Zhuo,Yongqiang Cheng,Shengbo Sang
Two-dimensional (2D) transition metal carbides (MXene) have attracted great attention for device applications due to their unique structures and excellent properties, such as high electrical conductivity and abundant functional groups on the surface. However, gas sensors based on Ti 3 C 2 T x MXene have the problems of high detection limit and poor long-term stability. Herein, we report a simple method to prepare Ti 3 C 2 T x /Ti 3 AlC 2 planar composite gas sensing materials using high molar ratio of HCl and LiF with Ti 3 AlC 2 as a framework. The Ti 3 C 2 T x /Ti 3 AlC 2 planar composite gas sensor has a high sensitivity, good selectivity and low detection limit for NH 3 , which can detect 50 ppb (1.2%) at room temperature ((25 ± 2) ℃). Furthermore, the gas sensor has good repeatability and long-term stability. After 120 days, the response of the gas sensor to 500 ppb of NH 3 fluctuated little due to the Ti 3 AlC 2 as a framework. The superior performances can be attributed to the special heterojunction between Ti 3 C 2 T x and Ti 3 AlC 2 and the high proportion of -O and -OH functional groups on the surface of Ti 3 C 2 T x /Ti 3 AlC 2 composite. This study provides an important reference for the realization of high performance NH 3 sensing by Ti 3 C 2 T x .
研究领域:
材料科学
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传感器技术
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DOI
高影响因子
Coatings
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2018
·Vol. 8
·期 10
·372
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IF 2.35
Yang Gao,Chaonan Kan,Ming Chen,Chuying Chen,Yuhuan Chen,Yongqi Fu,Chunpeng Wan,Jinyin Chen
The current work aimed to evaluate the efficacy of four coating formulations—chitosan coating (CH), 0.5% cinnamaldehyde + chitosan (0.5% CI–CH), 1.0% cinnamaldehyde + chitosan (1.0% CI–CH), and 1.5% cinnamaldehyde + chitosan (1.5% CI–CH)—on fresh mandarin fruit cv. Ponkan quality maintenance (weight loss, decay rate, total soluble solids, titratable acidity, vitamin C, color index, malondialdehyde, and antioxidant activity) over 100 days of storage at 20 °C. Compared to the control, chitosan treatment effectively reduced the decay and weight loss rates of mandarin fruit cv. Ponkan during storage at room temperature, delayed the decline of nutritional quality in fruits, increased the antioxidant capacity, and inhibited the accumulation of malondialdehyde (MDA). In comparison to chitosan coating, 1.5% CI–CH did not improve the fruit storage effect, but inhibited the normal color change of fruits and increased the accumulation of MDA. Both 0.5% CI–CH and 1.0% CI–CH effectively reduced the rate of fruit decay, improved the quality of fruits after harvest, and delayed fruit aging. Our study suggests that 0.5% CI–CH and 1.0% CI–CH might be good formulations for maintaining the quality of mandarin fruit cv. Ponkan during room-temperature storage.Keywords:chitosan;coating;cinnamaldehyde;fruit;room temperature
研究领域:
食品科学
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植物保护
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DOI
高影响因子
Materials
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2023
·Vol. 16
·期 4
·1544
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IF 3.4
Angxuan Wu,Yuchen Zhu,Chen Xu,Nianping Yan,Xuetong Zhao,Xilin Wang,Zhidong Jia
Arc floating in surface flashover can be controlled by reducing the interfacial charge-transfer resistance of ceramics. However, thus far, only a few studies have been conducted on methods of treating ceramic surfaces directly to reduce the interfacial charge-transfer resistance. Herein, we explore the flash sintering behavior of a ceramic surface (3 mol% yttria-stabilized zirconia (3YSZ)) onto which loose metal (iron) powder was spread prior to flash sintering at room temperature (25 °C). The iron powder acts as a conductive phase that accelerates the start of flash sintering while also doping the ceramic phase during the sintering process. Notably, the iron powder substantially reduces the transition time from the arc stage to the flash stage from 13.50 to 8.22 s. The surface temperature (~1600 °C) of the ceramic substrate is sufficiently high to melt the iron powder. The molten metal then reacts with the ceramic surface, causing iron ions to substitute Zr4+ions and promoting rapid densification. The YSZ grains in the metal-infiltrated area grow exceptionally fast. The results demonstrate that spreading metal powder onto a ceramic surface prior to flash sintering can enable the metal to enter the ceramic pores, which will be of significance in developing and enhancing ceramic–metal powder processing techniques.Keywords:flash sintering;room temperature;YSZ;metal powders;arc
研究领域:
材料科学
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陶瓷加工
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产品关联
DOI
PubMed
高影响因子
Journal of the American Chemical Society
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2025
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IF 15.6
Jun Mao,Huan Liu,Yanan Li,Meng Gao,Yunlong Zhang,Yao Song,Mo Zhang,Guilan Xu,Wu Zhou,Liang Yu,Xiaoju Cui,Dehui Deng
The oriented conversion of CH4 to CH3COOH at low temperature, even room temperature, is both scientifically significant and industrially applicable for CH4 utilization, yet it is extremely challenging due to the difficulties associated with efficient CH4 activation and controllable C–C coupling. In this study, we for the first time achieve the room-temperature conversion of CH4 to CH3COOH using molecular O2 and CO over MoS2-confined Rh–Fe sites, which delivers an unprecedented CH3COOH selectivity of 90.3% and a productivity of 26.2 μmol gcat.–1 h–1 at 25 °C. Furthermore, the productivity of CH3COOH can be enhanced to 105.6 μmol gcat.–1 h–1 at 80 °C, while maintaining a high selectivity of 95.6%. Comprehensive experimental and theoretical investigation reveal the critical role of Rh–Fe synergy in the selective formation of CH3COOH. The confined Fe sites in MoS2 enable the activation of O2 to generate highly reactive Fe═O center for CH4 dissociation to CH3 species at room temperature, which then readily couple with adsorbed CO on adjacent Rh sites to form the key CH3CO intermediate for CH3COOH production. The unique structure of Rh–Fe sites offers synergistic catalytic properties that effectively balance C–H activation and C–C coupling, successfully addressing the trade-off between activity and selectivity in the carbonylation of CH4 to CH3COOH under mild conditions.
研究领域:
化学
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催化反应
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材料科学
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产品关联
DOI
PubMed
高影响因子
Small
·
2021
·Vol. 17
·期 20
·2100137
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IF 13.281
Ping Chen,Zexin Li,Dongyan Li,Lejing Pi,Xitao Liu,Junhua Luo,Xing Zhou,Tianyou Zhai
High color purity and color rendition of 2D luminescent materials have long been pursued for applications in low-dimensional lighting, display, biolabeling, and laser. However, the reported photoluminescence (PL) linewidth of most 2D luminescent materials is about dozens of meV. Herein, a brand-new luminescent system of 2D rare earth (RE) material EuOCl (1.1 nm) with ultra-narrow linewidth (1.2 meV) at room temperature is successfully synthesized via chemical vapor deposition (CVD). The linewidth of EuOCl flakes at room temperature is even narrower than most 2D luminescent materials and heterostructures detected at below 10 K. Impressively, the as-synthesized EuOCl flakes show abnormal temperature-dependent photoluminescent properties, which is absolutely different from the relatively stable 4f–4f transitions in RE owing to shielding from outer shell electrons. J-mixing effect has been successfully applied for this phenomenon. Undoubtedly, luminescent 2D EuOCl flakes will open new territory for the applications of 2D RE materials in the 2D luminescent areas, especially for the applications at room temperature.
研究领域:
材料科学
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光学
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DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 3
·464
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IF 4.324
Sizhe Hu,Kai Jiang,Yuci Wang,Sui Wang,Zhongjun Li,Hengwei Lin
Carbon dots (CDs) with a room temperature phosphorescent (RTP) feature have attracted considerable interest in recent years due to their fundamental importance and promising applications. However, the reported matrix-free RTP CDs only show short-wavelength (green to yellow) emissions and have to be triggered by ultraviolet (UV) light (below 400 nm), limiting their applications in certain fields. Herein, visible-light-excited matrix-free RTP CDs (named AA-CDs) with a long-wavelength (orange) emission are reported for the first time. The AA-CDs can be facilely prepared via a microwave heating treatment of L-aspartic acid (AA) in the presence of ammonia and they emit unique orange RTP in the solid state with visible light (420 nm) excitation just being switched off. Through the studies of the carbonization process, the C=O and C=N containing moieties in the AA-CDs are confirmed to be responsible for the observed RTP emission. Finally, the applications of AA-CDs in information encryption and anti-counterfeiting were preliminarily demonstrated.Keywords:carbon dots;room temperature phosphorescence;visible-light-excitation;anti-counterfeiting
研究领域:
材料科学
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光学
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产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
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IF 2.931
Jing Zou,Yixin Huang,Lirong Zhu,Zheng Cui,Baoling Yuan
A spectrophotometric method using 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) as the indicator was proposed for measuring persulfates, i.e., peroxymonosulfate (PMS) and peroxydisulfate (PDS). This method was based on the direct oxidation of the colorless ABTS by PMS/PDS to generate the green-colored ABTS + at neutral pH and room temperature . The generated ABTS + had four different characteristic absorption peaks at 820 nm, 732 nm, 650 nm and 415 nm. The absorption values at these wavelengths increased with the increase of PMS/PDS concentration, and there were well linear relationships (R 2 > 0.998) between the corresponding absorption values and the concentrations of PMS/PDS in the range of 3–500 μM. Monitoring the change of PMS/PDS concentration by the proposed ABTS method was in good agreement with that monitored by the common spectrophotometric method using potassium iodide as the indicator. The green-colored waste solutions produced after PMS/PDS analysis with the ABTS method showed no bactericidal effect towards Escherichia coli . The proposed multi-wavelength spectrophotometric method using ABTS as the indicator could be employed as a candidate method for the accurate and convenient measurement of PMS/PDS in water.
研究领域:
分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2023
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IF 5.9
Weiqi Wang,Jiamu Cao,Rongji Zhang,Huaxin Xiu,Yufeng Zhang
Although SnO2 nanomaterials have been leading components of semiconductor gas sensors, their long-standing challenges of high working temperatures limit their practical application for ultralow-power-consumption room-temperature sensing. In this study, Au and Pt bimetallic nanoparticles were used to fabricate a MoS2/AuPt/SnO2 nanocomposite device by interfacially engineering a MoS2/SnO2 nanostructure. Owing to the unique structure and electrical properties, the as-fabricated MoS2/AuPt/SnO2 device exhibits a remarkable sensing response (2.22), short response time (20 s), and excellent baseline recovery (8 s) to 10 ppm NO2 gas at 23 ± 2 °C. Meanwhile, the MoS2/AuPt/SnO2 device possesses high sensitivity, a low detection limit (20 ppb), commendable reversibility, appreciable stability, and excellent selectivity against ammonia, carbon monoxide, ethanol, isopropanol, and acetone gases. The superior sensing characteristics of the MoS2/AuPt/SnO2 nanocomposite device are attributed to the modulation effect of the Schottky junction and p–n heterojunction on the potential barrier, highly efficient interfacial electron transport, and edge-enriched structure, which provide abundant active adsorption sites. This work will advance the evolution of room-temperature gas-sensitive nanomaterials and render them promising for applications in ultralow power-integrated sensors.
研究领域:
材料科学
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纳米技术
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传感器技术
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Zhuoyu Wang,Jiajia Shan,Kunpeng Yu,Lang Huang,Qiong Wu
In response to the critical challenges of high toxicity, complex synthesis, and poor environmental stability in conventional room-temperature phosphorescent materials, this study presents a sustainable biomass-derived strategy through the development of lignin-based carbon dot/inorganic salt composites (CDSL X -T). By employing a one-step molten salt approach, we construct a hierarchical architecture featuring lignin-derived sp 2 -hybridized carbon cores and a rigid crystalline shell comprising multi-component inorganic salts (MgO/Mg 3 (PO 4 ) 2 /KCl/KNO 3 ). The inherent conjugated moieties of lignin facilitate efficient intersystem crossing, while nitrogen doping optimizes (n, π*) electronic configurations to enhance spin-orbit coupling effects. In situ characterization elucidates the synergistic mechanism of high-temperature-induced carbon core aromatization and salt matrix crystallization. A dual confinement strategy-combining covalent bonding (C-K/C-Cl/C-Mg) and spatial restriction-effectively suppresses carbon dot vibrations and non-radiative triplet exciton transitions, enabling stable phosphorescence emission in aqueous environments. Leveraging time-resolved luminescence characteristics with tunable lifetimes, the material demonstrates unique potential in fingerprint visualization and multilevel information encryption. This work establishes an eco-friendly synthetic paradigm for high-performance bio-based optical materials, bridging sustainable chemistry with advanced photonic applications.
研究领域:
材料科学
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环境科学
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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）