CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Xingyue Yang,Lei Wang,Shijie Zhou,Shilong Zhang,Yongfang Xu,Yujie Bian,Zhaowei Tian,Yusen Yang,Min Wei
Liquid organic hydrogen carriers (LOHC), which involve reversible catalytic hydrogenation/dehydrogenation cycles, have attracted considerable attention. This study investigates Cu/CuAlO x catalysts with unique Cu 0 –Cu + interfacial sites, which are prepared via structural topological transformation of layered double hydroxide (LDH) precursors. The optimized Cu/CuAlO x catalysts exhibit exceptional catalytic activity in 1,2,3,4-tetrahydroquinoline (THQ) dehydrogenation, achieving a complete conversion of THQ within 1.5 h and a turnover frequency (TOF) value amounts to 19.94 h −1 at 150 °C, which stands at the highest echelon compared with previously reported heterogeneous catalysts. Furthermore, the catalyst also exhibits excellent performance in quinoline hydrogenation (yield >99 %) after 6 h at 60 °C, and the TOF value reaches up to 7.01 h −1 . A comprehensive investigation based on XPS, TEM and XAFS verifies the dual active states Cu 0 and Cu + sites coexisting on nanoparticle surfaces. Both experimental studies ( in situ DRIFTS and XPS) and DFT calculations reveal the pivotal role of the Cu 0 − Cu + synergistic effect in dictating catalytic behavior: the Cu + species preferentially adsorb and activate the N − H bonds and C − H bonds in N-heterocycles; Whereas the Cu 0 site facilitates efficient reassociation of surface adsorbed H atoms and product desorption (H 2 ). This work exhibits substantial potential for implementation in hydrogen storage technologies, offering a viable pathway towards efficient LOHC utilization in clean energy systems.
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JOURNAL OF MATERIALS SCIENCE
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2025
·
IF 3.9
Gao Minjie,Yang Zongmei,Song Senchuan,Liu Xigui,Wang Fei
A series of Pd/N-doped graphene catalysts were designed for the efficient and highly selective synthesis of muscone through the hydrogenation of 3-methylcyclopentadecenone (XT). The catalysts were characterized using FT-IR, BET, XPS, XRD, Raman and SEM–EDS. All results indicated the uniform dispersion of Pd on NG. By optimizing reaction conditions, the hydrogenation of XT achieved a high yield and selectivity of muscone, producing a 99% yield at 2 MPa H 2 and 90 °C in 10 h using a 10 wt% Pd/N-doped graphene catalyst functionalized with melamine (Pd/NmG), which significantly outperformed conventional Pd/C catalysts. Graphical abstract
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Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 4
·1-13
·
IF 23.2
Li Mufang,Chen Huijun,Zhao Jiale,Xia Ming,Qing Xing,Wang Wen,Liu Qiongzhen,Lu Ying,Luo Mengying,Zhu Xiufang,Wang Dong
The increased human demand for an intelligent life puts forward a great requirement for lightweight, stretchable, and comfort sensing and energy harvesting devices. Stretchable thermoelectric fiber becomes very attractive due to it can directly convert human body waste heat into electricity and enables stress, strain, and temperature sensing by designing the structure of the materials. However, the preparation of stretchable poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) fibers with enhanced performances and continuous p-n alternating structure remains a challenge. In this study, the stretchable continuous p-n alternating thermoelectric fibers were prepared by a simple and controllable microfluidic wet-spinning process, in which the single-walled carbon nanotubes (SWCNT)/PEDOT:PSS/polyurethane (PU) and polyethyleneimine (PEI) doped SWCNT/PEDOT:PSS/PU were used as p- and n-type segments, respectively. To optimize the performances, the effect of SWCNT and PEI concentration on the morphology, thermoelectric, and mechanical properties of p- and n-type fibers were analyzed. The power factor of the p- and n-type fibers were 2.67 and 3.48 µW m −1 K −2 , respectively, with a stress of 16 ~ 19 MPa and strain of 70%. Then, the strain and temperature sensors were constructed by the stretchable TE fibers and used for respiration and motion monitoring, showing excellent sensitivity and stability. All the results demonstrate the multifunctions of the stretchable TE fibers used as flexible wearable electronics.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Xiang-Yu Lin,Ming-Yu Qi,Zi-Rong Tang,Yi-Jun Xu
Photochemical dehydrogenation of N-heterocyclic amines to corresponding N-heteroaromatics paired with hydrogen (H 2 ) production represents a promising route for the green and sustainable organic synthesis and clean fuel generation. Herein, metal-organic frameworks (MOFs)-supported CdS nanoparticles are gingerly fabricated for the visible light-initiated acceptorless dehydrogenation of diverse N-heterocycles at ambient conditions. With further nickel cocatalysts modification via a simple photodeposition method, the optimized MIL-101 @CdS-Ni composite exhibits remarkably enhanced activities, which are 8 folds higher than that of binary MIL-101 @CdS and 2.8 times higher than that of MOF-removed CdS-Ni counterparts, along with high selectivity and good stability. Mechanism studies reveal that active nickel species plays a key role in accelerating the separation of photogenerated charge carries and the cleavage of C−H and N−H bonds in the scaffold of N-heterocycles on the catalyst surface. This work is expected to guide the rational catalysts design of MOF-based multifunctional materials for photochemical coupling of concurrent organic synthesis with H 2 production.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Fangling Zhou,Zhuangzhuang Mu,Zhenyu Yuan,Renze Zhang,Xin Yan,Fanli Meng
N-butanol is a volatile organic compound (VOC) that is harmful to human health, and the development of gas sensors for n-butanol vapor detection is necessary. In this work, the nanoflowers-like ZnSnO 3 was synthesized via a one-step hydrothermal route followed by an annealing process. The results revealed that optimizing the hydrothermal time to 12 h resulted in ZnSnO 3 -2 exhibiting the highest gas response (40.48) towards 100 ppm n-butanol at 275°C, boasting a detection limit of 500 ppb. Furthermore, ZnSnO 3 -2 exhibits excellent gas selectivity and long-term stability. The improved sensing performance of ZnSnO 3 -2 was attributed to its large specific surface area and abundant oxygen vacancies. Additionally, the gas sensing mechanism for enhancing n-butanol detection was comprehensively analyzed. These results highlight the potential of nanoflower-like ZnSnO 3 as a promising candidate for n-butanol gas sensing material, offering both high sensitivity and selectivity. Moreover, this research provides valuable guidance for the development and optimization of gas sensing materials for applications in environmental monitoring and industrial safety.
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ChemistrySelect
·
2025
·Vol. 10
·期 36
·e04484
·
IF 2
Xiaoqian He,Peicheng Jiang,Qilin Wang,Xinyi Luo,Shu Chen
Organic water pollution poses a global challenge. The unique properties of transition metal carbides (MXenes) make them ideal candidate adsorbents for removing water contaminants. However, limitations in the types and quantities of surface functional groups on MXenes, coupled with their inherent instability, have restricted their application in adsorbing organic dyes such as methyl blue. This study prepared sulfur–nitrogen co-doped MXenes (S─N─MX) through thermal annealing co-doping of MXenes with thiourea. This method successfully introduced sulfur and nitrogen elements as functional groups into the MXene structure, increasing the variety and quantity of surface functional groups and significantly enhancing the number of active sites. This process effectively suppresses nanolayer stacking, enhances structural stability, and substantially increases the material's adsorption capacity. Langmuir adsorption isotherm measurements reveal a maximum adsorption capacity of 239.8 mg·g −1 at 298 K and pH = 9. The material achieves efficient adsorption of methylene blue through electrostatic interactions, Lewis acid–base interactions, and hydrogen bonding. The incorporation of sulfur and nitrogen elements provides a protective effect, ensuring the composite adsorbent maintains excellent stability during adsorption–desorption cycles. After five adsorption-desorption cycles, its adsorption capacity retained over 85%. Graphical S–N co-doped MXene is synthesized via thermal annealing with thiourea, which introduces abundant surface functional groups and enhances active sites. This adsorbent exhibits a high methylene blue adsorption capacity of 239.8 mg·g - 1 through electrostatic attraction, Lewis acid–base interaction, and hydrogen bonding. It also demonstrates excellent recyclability, retaining over 85% efficiency after five cycles.
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International Journal of Applied Ceramic Technology
·
2016
·Vol. 13
·期 5
·966-972
·
IF 1.534
Xiaofeng Wang,Chaoqun Peng,Richu Wang,Dou Zhang,Jing Zeng,Yan Feng
Recently, we developed an efficient method for rapid drying and improving relative density of the gelcast green body. In this work, polymerization and rheological behavior of the thermoresponsive gelcasting system based on N- isopropylacrylamide were investigated. To initiate reaction of the system with 4 mL/L of catalyst, 0.25–0.5 mg/mL of initiator is considered optimal in the optimized temperature range 15–20°C. Suspensions with 40–55 vol.% solid loading still show shear-thinning behavior, which is favorable for mixing, degassing, and casting. The final storage moduli of consolidated suspensions are approximately 10 4 Pa, which is sufficiently high for gelcast green bodies.
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Matter
·
2019
·
IF 0
Wen Tao Jing,Ying Zhang,Yan Gu,Yong Fu Zhu,Chun Cheng Yang,Qing Jiang
The sodium-ion battery has shown great potential to replace the lithium-ion battery, especially for large-scale energy-storage systems. In this work, a hybrid material of ultra-small Sb nanoparticles encapsulated in unique N-doped carbon nanonecklace (Sb/N-CNN) has been synthesized for the first time via electrospinning and in situ substitution. As an anode material in sodium-ion batteries, the as-fabricated Sb/N-CNN exhibits superior rate property (314 mAh g −1 at 20 A g −1 ) and cycling stability (401 mAh g −1 after 6,000 cycles at 1 A g −1 ), outperforming other Sb-based materials. Such excellent performances originate from the ingenious necklace-like structure of Sb/N-CNN, which supplies efficient electrolyte diffusion paths and more active sites for Na + insertion/extraction, disperses the stress caused by the large volume change of Sb nanoparticles during the cycling process, and also reduces the electrode resistance. This study provides a facile strategy for construction of a well-designed structure for advanced energy-storage technologies.
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IRANIAN POLYMER JOURNAL
·
2023
·Vol. 32
·期 9
·1189-1197
·
IF 3.1
Luo Yanrong,Lu Chunlan,Zhang Xiaolin,Zhan Shiping
With the widespread use of hydrogels, injectable hydrogels for the human body require higher safety and non-toxicity. The most important is the choice of cross-linking agent to be green. In this study, acylated chitosan macromolecular crosslinkers (MCS) were prepared by maleic acid (MA) and chitosan (CS). Its structure was confirmed by FTIR and 1 H NMR and its degree of acylation was also determined. Then, a series of polymeric network hydrogels were investigated. The cross-linked copolymer poly( N -isopropyacrylamide-maleic acid copolymer)/acylated chitosan P(NIPAM- co -MA)/MCS is a series of thermosensitive hydrogels formed by free radical polymerization of NIPAM and MA with MCS as cross-linking agent. The apparent morphology, thermosensitive transition point, and hydrophilicity were investigated. The results show that the hydrogel has a homogeneous pore structure inside. The optimal low critical solution temperature (LCST) was 36.66 ℃. In addition, with the increase of maleic acid content, the water contact angle of the hydrogel is smaller, that is, the hydrophilic effect is better. The results indicate that the P(NIPAM- co -MA)/MCS hydrogels were synthesized successfully and may be a potential material for biomedical, drug delivery, or absorption application. This study can provide a certain research basis and relevant theoretical basis for clinical practice. Graphical abstract
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Nano Research
·
2023
·Vol. 16
·期 7
·9507-9518
·
IF 9.9
Wu Hao,Song Ziyu,Feng Wenfang,Zhou Zhibin,Zhang Heng
Rechargeable lithium metal batteries (RLMBs) have been regarded as promising successors for contemporary lithium-ion batteries, in view of their high gravimetric and volumetric energy densities. Conventional non-aqueous liquid electrolytes containing organic carbonate solvents possess high chemical reactivities with metallic lithium anode and high flammability, which induces considerable safety threats under extreme conditions (e.g., overcharging and thermal runaway). Herein, we propose the utilization of fluorinated sulfonamide (i.e., N,N-dimethyl fluorosulfonamide (DMFSA)) as solvent, together with lithium (fluorosulfonyl)( n -nonafluorobutanesulfonyl)imide (LiFNFSI) as co-salt and/or electrolyte additive for accessing safer and high-performing RLMBs. Comprehensive physical (e.g., thermal transition, viscosity, and ionic conductivity) and electrochemical (e.g., anodic stability on different electrodes) characterizations have been performed, aiming to reveal the inherent characteristics of the sulfonamide-based electrolytes and the particular role of LiFNFSI on the stabilization of LiCoO 2 cathode. It has been demonstrated that the sulfonamide-based electrolytes exhibit superior flame-retardant abilities and decent ionic conductivities (> 1 mS·cm −1 at room temperature). The incorporation of LiFNFSI as co-salt and/or electrolyte additive could significantly suppress the side reactions occurring at the cathode compartment, through the preferential decompositions of the FNFSI − anion. This work is anticipated to give an in-depth understanding on the working mechanism of LiFNFSI in the sulfonamide-based electrolytes, and also spurs the development of high-energy and safer RLMBs.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Jing Hao,Dang-guo Cheng,Fengqiu Chen,Xiaoli Zhan
To explore the effect of channel properties on catalytic activity, ZSM-5 zeolite nanosheets were synthesized with di-quaternary ammonium-type surfactant and used in n-heptane cracking reaction. Nanosheet thickness was changed from around 4 nm–20 nm by adjusting the ratio of surfactant to tetraethyl orthosilicate (TEOS). The synthesized zeolite nanosheets were characterized by physical and chemical adsorption , electron microscopy , X-ray diffraction (XRD), pyridine infrared (Py-IR), Thermogravimetric analysis (TGA) and Raman spectra. The results showed that zeolite with thicker nanosheets had more microporosity and was more conducive to remarkably improving the selectivity of light olefins . High mesoporosity of zeolite nanosheets greatly reduces the diffusion resistance and accelerates mass transfer which even increases the direct diffusion of insufficiently cracked intermediates. Thicker zeolite nanosheets with more micropores prolong the reaction time and thus improve the selectivity of target products.
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Science China-Materials
·
2019
·Vol. 63
·期 4
·505-515
·
IF 5.636
Fan Honghong,Qin Bowen,Wang Zhiwei,Li Huanhuan,Guo Jinzhi,Wu Xinglong,Zhang Jingping
Constructing potential anodes for sodium-ion batteries (SIBs) with a wide temperature property has captured enormous interests in recent years. Fe 1− x S, a zero-band gap material confirmed by density states calculation, is an ideal electrode for fast energy storage on account of its low cost and high theoretical capacity. Herein, Fe 1− x S nanosheet wrapped by nitrogen-doped carbon (Fe 1− x S@NC) is engineered through a post-sulfidation strategy using Fe-based metal-organic framework (Fe-MOF) as the precursor. The obtained Fe 1− x S@NC agaric-like structure can well shorten the charge diffusion pathway, and significantly enhance the ionic/electronic conductivities and the reaction kinetics. As expected, the Fe 1− x S@NC electrode, as a prospective SIB anode, delivers a desirable capacity up to 510.2 mA h g −1 at a high rate of 8000 mA g −1 . Additionally, even operated at low temperatures of 0 and −25°C, high reversible capacities of 387.1 and 223.4 mA h g −1 can still be obtained at 2000 mA g −1 , respectively, indicating its huge potential use at harsh temperatures. More noticeably, the full battery made by the Fe 1− x S@NC anode and Na 3 V 2 (PO 4 ) 2 O 2 F cathode achieves a remarkable rate capacity (186.8 mA h g −1 at 2000 mA g −1 ) and an impressive cycle performance (183.6 mA h g −1 after 100 cycles at 700 mA g −1 ) between 0.3 and 3.8 V. Such excellent electrochemical performance is mainly contributed by its pseudocapacitive dominated behavior, which brings fast electrode kinetics and robust structural stability to the whole electrode.
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