ChemCatChem
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2024
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IF 3.8
Yuxin Sun,Yunshuo Wu,Zhuoyi Zhang,Xuanhao Wu,Haiqiang Wang,Zhongbiao Wu
Graphical Ce-Pr co-doped Co 3 O 4 achieved 100% N 2 O conversion at 400 °C over Pr 0.02 Ce 0.2 Co 1 . The introduction of Ce facilitated the formation of oxygen vacancies, which were essential for N 2 O activation. But these Ce species strictly inhibited Co 3 O 4 crystallization and surface exposure, which were unfavorable to N 2 O decomposition. By the codoping of Pr, these negative effects were eliminated, leading to remarkable catalytic performance. Nitrous oxide (N 2 O) has gained increasing attention as a non-carbon dioxide greenhouse gas, and catalytic decomposition is an effective method for mitigating its emissions. In this study, Ce-Pr Co-doped Co 3 O 4 was synthesized via a coprecipitation method and used for the catalytic decomposition of N 2 O. The experimental results revealed that the N 2 O decomposition achieved 100% conversion at 400 °C on the catalyst with a Pr/Ce/Co molar ratio of 0.02:0.2:1, exhibiting an 80 °C decrease of T 100 compared with that of Co 3 O 4 . The introduction of Ce reduced the size and crystallization of Co 3 O 4 particles, increased the activity of the lattice oxygen of Co 3 O 4 , and facilitated the formation of oxygen vacancies, thereby enhancing the activation of N 2 O. However, the introduction of Ce inhibited the crystallization of Co 3 O 4 and the surface coverage of CeO 2 decreased the exposure degree of N 2 O molecules to the Co 3 O 4 surface. Co-doping strategy of Ce-Pr was performed to alleviate the negative effects of ceria. Consequently, the incorporation of Ce and Pr species enhanced the redox properties of Co 3 O 4 , leading to remarkable catalytic performance of N 2 O decomposition. This study elucidated the interaction between Ce and Pr dopants and Co 3 O 4 , and encouraged more attention on designing novel catalysts for N 2 O mitigation.
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CHINESE JOURNAL OF PHYSICS
·
2024
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IF 4.6
Zhuojia Xie,Zhengguang Zou,Changji Xu,Shenglin Zhong,Min Feng,Xinyu Jiang,Weijian Zhang,Xiuxin Zheng,Wenbin He
We prepared La 0.8- x K x Sr 0.2 Mn 0.95 Co 0.05 O 3 (0 ⩽ x ⩽ 0.1) (LKSMCO) through the modified sol-gel method (S-G) and its structure. Then, the magnetic, magnetocaloric, and critical behavior were analyzed. LKSMCO was confirmed to be the rhombohedral structure within the R-3c space group (No.167) using transmission electron microscopy and X-ray diffraction. For validating the chemical composition of LKSMCO, X-ray photoelectron spectroscopy and EDS were applied, showing that K + was successfully doped. Phase transition of LKSMCO from paramagnetic to ferromagnetic phase near Curie temperature (Tc) was confirmed with a Magnetic Property Measurement System (MPMS). Using normalization and Banerjee's criterion, LKSMCO was demonstrated to be the second-order magnetic phase transition (SOMPT). As shown from the applied magnetic field, the maximal magnetic entropy ( − Δ S M m a x ) of LKSMCO near Tc was 3.87 J/(kg K) ( x = 0.00), 4.28 J/(kg K) ( x = 0.05) and 4.44 J/(kg K) ( x = 0.10). We employed the Kouvel-Fisher approach (KF) and modified Arrott plots to confirm the values of γ, δ , and β . This indicates that critical exponents of LKSMCO were consistent with the Mean-filed model.
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Journal of Materials Chemistry B
·
2025
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IF 5.7
Min Zhang,Miao Qiu,Zengkun Li,Rui Xu,Yao Wang,Wei Wang,Christopher D. Snow,Matt J. Kipper,Laurence A. Belfiore,Jianguo Tang
Protein crystals have advantageous properties as framework materials, such as porosity and organized, high-density functional groups with the potential for guest specificity. Thus, protein crystal materials open up vast opportunities for fluorescent species doping and drug sensing. In this work, we explore this frontier by combining two lanthanide complexes with hen egg white lysozyme (HEWL) and directly obtaining co deposited structures in one step using an anti-solvent method different from the previous two-step method. Cross-linking of the protein was achieved using glutaraldehyde, ensuring the stability of the assembly in diverse solvent environments. The use of glutaraldehyde achieved protein cross-linking, ensuring the stability of the components in various solvent environments, including no leakage of fluorescent substances in ultrapure water and anhydrous ethanol. Differential fluorescence quenching effects of amino acids on the two doped luminescent complexes were observed. Introduction of amino acids, varying in concentration and type, resulted in distinct fluorescence enhancement or quenching effects on the protein assembly loaded with the complexes, and the detection results are reflected through different fitting equations and parameters. By exploring the application of this hybrid material for amino acid detection, this work lays the groundwork for broader applications.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2025
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IF 4.1
Qianqian Song,Yang Chen,Yongjian Xu,Yatao Yan,Qianhui Wu,Fang Guo,Ming Chen,Guowang Diao
Hydrogen energy represents a form of green energy, and the electrolysis of water for hydrogen production is recognized as an efficient method. Current research is primarily focused on the development of catalysts that are both efficient and stable, particularly those capable of functioning consistently across the entire pH spectrum. In this work, Co 9 S 8 /NC co doped with N and P was successfully synthesized through a series of sulfurization, calcination, and phosphating operations using dual ligand Co-ZIF as the precursor. By coating a carbon layer and co doping with nitrogen and phosphorus, the catalytic performance and stability of hydrogen evolution reaction (HER) were significantly improved over the entire pH range. At a fixed current density of 10 mA cm −2 , the overpotential of HER was measured at voltages of 136, 96, and 194 mV in three different pH solutions. Furthermore, the electrocatalyst exhibits remarkable electrochemical stability over extended periods. After 20 h or 2000 cycles of testing, the catalytic activity did not show a significant decrease across the entire pH range, but rather exhibited a relatively sustained constant.
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NEW CARBON MATERIALS
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2024
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IF 6.5
Tan Yi,Jun-long Huang,Zong-heng Cen,Yi-wei Ji,Shao-hong Liu
Carbon-based catalysts are promising materials for the electrochemical extraction of uranium from seawater. However, their practical application is often limited by high cost and low catalytic activity. Using low-cost polystyrene sulfonic acid resin and melamine as raw materials, a class of nitrogen and sulfur co-doped carbon nanosheets (CNSs) with high catalytic activity has been developed by a low-temperature hydrothermal treatment and high-temperature carbonization. Because of their high conductivity and high catalytic activity, CNS-based electrodes can catalyze uranyl ions in seawater into easily recoverable Na 2 O(UO 3 ·H 2 O) x precipitates at −2 V, and achieve an extraction capacity of up to 3 923.7 mg g −1 with a uranium removal of 98.1% in uranium-spiked seawater (1×10 3 mg L −1 ). In situ Raman spectroscopy showed that a large number of uranium compounds appeared on the surface of the composite electrode within 40 min of extraction. The electrode also recovered 72.7% of the uranium in natural seawater, demonstrating excellent prospects for this application. This work provides a new approach into the design of low-cost, metal-free electrocatalysts for the efficient uranium extraction from natural seawater.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2025
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IF 8.9
Lili Zhang,Gong-qiu Peng,Deqi Jing,Ying-fen Wang,Shouchun Zhang
Carbon fiber/epoxy composites (CF/EP) are significant components of engineering materials in defense, aerospace and transportation field. Nevertheless, one of the main obstacles to improve mechanical strength of CF/EP is delamination. In this study, a kind of hydroxyl-functionalized block co-polyimide (BOH) filming as interleaves achieved multi-scale synergistic toughening, including reaction-induced phase separation structures at nano-scale and plastic deformation of BOH enrichment at micro-scale, which aims to improve the interlaminar fracture toughness of CF/EP composites effectively. As a result, mode I interlaminar toughness at initial (G IC-NL ) and at propagation (G IC-Prop ) of CF/EP laminates interleaved with 7 μm BOH film (CF-EP/BOH7) are increased by 126 % and 183 %, respectively. CF-EP/BOH7 laminates exhibit improvement of 206 % in mode II interlaminar toughness. This multi-scale toughening method initiates a new way for improving the interlaminar toughness of CF/EP composites.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Haobin Song,Tong Li,Tingting He,Zhouhao Wang,Daliang Fang,Ye Wang,Xue Liang Li,Daohong Zhang,Junping Hu,Shaozhuan Huang
The intelligent design of catalytic materials with unique architectures has a significant impact on regulating the polysulfides (LiPSs) conversion and boosting the performance of Li − S batteries. Here, starting from 2D catalytic MoS 2 nanosheets and combined with the first-principle calculations, the covalent heterojunction and S vacancy are simultaneously developed in MoS 2 to regulate the electronic structure and improve the LiPSs conversion kinetics. The S vacancy and heterojunction (MoS 2-x -Co 9 S 8-y ) engineering can significantly improve the electrical conductivity of MoS 2 by incorporating shallow donor levels into the MoS 2 . Moreover, the incorporation of Co 9 S 8-y greatly improves the chemisorption ability of heterostructure towards LiPSs. The LiPSs are preferentially adsorbed at the catalytic Mo-S-Co heterojunction, where both Li + and e - are easy to access. The coupled fast Li + /e - transportation of MoS 2-x -Co 9 S 8-y enables direct and fast LiPSs “adsorption-conversion” at the catalytic Mo-S-Co heterojunction with enhanced bidirectional catalytic properties. Due to the ingenious co-engineering of S vacancy and heterointerface, the Li − S cell with MoS 2-x -Co 9 S 8-y /rGO interlayer delivers high sulfur utilization (1382.5 mAh/g at 0.1C), excellent rate capability (710.2 mAh/g at 3C), and long cycle life over 600 cycles (0.06 % capacity decay per cycle). This work demonstrates the great potential of anion deficiency and heterojunction co-construction for high-performance Li − S batteries.
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CHEMICAL ENGINEERING JOURNAL
·
2022
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IF 16.744
Lei Yuan,Leihao Zhang,Jianpeng Feng,Chongyang Jiang,Jiaqi Feng,Chunshan Li,Shaojuan Zeng,Xiangping Zhang
Electric-driven CO 2 reduction to high value-added chemicals is a potential way to solve the carbon emissions. However, the current studies on CO 2 electroreduction (CO 2 ER) are mainly focused on design and preparation of novel electrocatalysts and electrolytes. The large-scale of CO 2 ER is puzzled in the serious hydrogen evolution reaction (HER) in aqueous electrolytes and inferior reaction stability in an enlarged CO 2 electrolyzer. Ionic liquids (ILs) as electrolytes have opened great opportunities for CO 2 ER due to their unique advantages. Herein, a large-scale CO 2 ER device containing an upscaling modified H-type flow cell using IL-based electrolytes (UHFC-IL) with the largest electrode active area of 495 cm 2 was established for CO 2 ER studies. The influences of key operating parameters, such as compositions of IL-based electrolytes, electrolytes velocity, CO 2 gas flow rate and cell voltage on CO 2 ER performance were systematically investigated. A high CO 2 ER performance under the optimum operating conditions achieves 83.9% Faraday Efficiency (FE) for CO with a reaction current of 6.32 A, suppressing HER to only 2% FE. After 10 hr continuous operation, the CO selectivity in IL-based electrolytes is 51.3% higher than that in 0.1 M KHCO 3 aqueous electrolytes, which maintains excellent stability with a high CO generation rate of 1.7 L hr -1 . In addition, the mechanism of CO 2 ER to CO boosted by IL-based electrolytes in UHFC-IL was proposed. This study provides experimental parameters and guidance for future research on the amplification process of CO 2 ER.
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CARBOHYDRATE POLYMERS
·
2017
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IF 4.811
Peng Wang,Hualin Wang,Jingrong Liu,Pengfei Wang,Suwei Jiang,Xingjiang Li,Shaotong Jiang
A montmorillonite@chitosan-poly (ethylene oxide) nanofibrous membrane (MMT@CPF) enhancing poly (vinyl alcohol-co-ethylene) (EVOH-MMT@CPF) composite film was developed by using a space-filling embedding method. The structure of EVOH-MMT@CPF was characterized, and the thermal stability, mechanical and barrier properties of the films were investigated. The CPF was fabricated via electrospinning technique and the self-assembly of MMT nano-platelets on CPF was achieved by the driving of electrostatic interactions between MMT nano-platelet and CPF. The experimental results indicated that the well-kept MMT@CPF after embedding in the EVOH matrix significantly improved the thermal stability and mechanical properties of the film, and also endowed the film with outstanding oxygen barrier (0.2 × 10 −16 cm 3 cm cm −2 s −1 Pa −1 ) and good moisture barrier (4.6 × 10 −6 g m m −2 s −1 atm −1 under a relative humidity of 90%) by prolonging the tortuous paths for molecule penetration. The composite film may have a great potential application in food packaging.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
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IF 3.8
Xuhai Zhu,Xiaobing Li,Rongjun Lin,Rui Lu,Fang Lu
Designing efficient catalysts for the preferential hydrogenation of vinyl groups is a pivotal challenge in the production of pharmaceuticals, agrochemicals, fine chemicals, dyes, and other valuable compounds. Herein, we developed evenly dispersed bimetallic Pd–Co nanoparticles on mesoporous silica nanospheres (MSNs) for selective hydrogenation of a model compound 3-nitrostyrene. By tuning the Pd/Co molar ratio and solvents, the efficiency of 3-nitrostyrene hydrogenation to 3-ethylnitrobenzene with the Pd1–Co1/MSN-Nb catalyst was well optimized; while 3-nitrostyrene was converted entirely, the selectivity of 3-ethylnitrobenzene was up to 95%. Moreover, this catalyst was stable and compatible with styrene and its derivatives. Further characterization results indicated that the combined effect of Pd-based metal nanoparticles and MSN-Nb and the electronic interaction between Pd and Co components in the Pd1–Co1/MSN-Nb catalyst have significant importance in the hydrogenation of 3-nitrostyrene. The aforementioned catalytic system will prove invaluable in guiding the selective hydrogenation of vinyl groups.
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ACS Sensors
·
2024
·
IF 8.2
Fan Zhao,Lingmin Yu,Jingfeng Wang,Wei Cao,Hao Zhang,Hairong Wang,Pu-Hong Wang,Zhihong Qiao
Achieving selective detection of ppb-level CO is important for air quality testing at industrial sites to ensure personal safety. Noble metal doping enhances charge transfer, which in turn reduces the detection limit of metal oxide gas sensors. In this work, metal–organic framework-derived Au-doped In2O3 nanotubes with high electrical conductivity are synthesized by pyrolysis of the Au-doped metal–organic framework (In-MIL-68) as a template. Gas-sensing experiments reveal that the detection limit of 0.2% Au-doped In2O3 nanotubes (0.2% Au, mass fraction) is as low as 750 ppb. Meanwhile, the sensing material shows a response value of 18.2 to 50 ppm of CO at 240 °C, which is about 2.8 times higher than that of pure In2O3. Meanwhile, the response and recovery times are short (37 s/86 s). The gas-sensing mechanism of CO is uncovered by in situ DRIFTS through the reaction intermediates. In addition, first-principles calculations suggest that Au doping of In2O3 significantly enhances its adsorption energy for CO and improves the electron transfer properties. This study reveals a novel synthesis pathway for Au-doped In2O3 nanotubular structures and their potential application in low concentration CO detection.
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ACS Sensors
·
2024
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IF 8.2
Shuang Cao,Zhao Song,Yu Bing,Xiaoyi Xu,Tingting Zhou,Tong Zhang
The development of a highly selective and trace-level gas sensing platform for detecting hydrogen sulfide (H2S) remains a formidable challenge. To solve this problem, Co–Mo multimetal oxide semiconductors are rationally tailored by employing metal organic frameworks (MOFs) as self-sacrificial templates. The MOF-derived Co3O4/β-CoMoO4 based gas sensors displays high sensitivity (Rg/Ra = 22) to 10 ppm of H2S and ultralow limit of detection (10 ppb H2S). The formation of p-p heterojunction and multivalence states of Mo play a crucial role in electron transfer and oxygen adsorption. A sensor array constructed from four Co3O4/β-CoMoO4 materials with different Co/Mo ratios demonstrates a superior selective discrimination of H2S from other VOCs and malodorous gases by principal component analysis (PCA). Besides, a H2S gas sensing and alarming platform was designed for monitoring the environment contaminated with H2S. This finding provides a feasible approach for the discovery of highly efficient gas sensors to monitor environmental H2S concentration.
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