INORGANIC CHEMISTRY
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2024
·
IF 4.3
Jinjian Wei,Mengxin Liu,Xinan Shi,Daocheng Pan
NaYF4:Ce3+,Tb3+ down-conversion nanoparticles with a photoluminescence quantum yield (PLQY) of 54.8% are synthesized by using a ligand-assisted coprecipitation method in this study. The reaction is completed within 1 min at room temperature, and short-chain hexanoic acid and hexylamine serve as the binary ligands, which enable us to synthesize highly luminescent NaYF4:Ce3+,Tb3+ nanoparticles at room temperature. X-ray diffraction (XRD) and transmission electron microscopy (TEM) are used to characterize the as-prepared nanocrystals. The results reveal that the NaYF4:Ce3+,Tb3+ nanocrystals exhibit excellent dispersion and have a particle size of 2.7 nm. Our NaYF4:Ce3+,Tb3+ nanocrystals possess the advantages of room-temperature preparation, high PLQY, and ultrasmall particle size. These results reveal that the NaYF4:Ce3+,Tb3+ nanocrystals might have a high potential in the applications of lighting, display devices, and bioimaging.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Dong Wang,Fengqin Tang,Hui Bai,Pengju Wu,Yaju Zhang,Lingyun Fang,Beibei Sun,Chunhui Shi,Libing Hu
The fabrication of advanced electrocatalysts for urea-assisted electrolytic water splitting is of great significance for yielding green hydrogen. In this study, Ce doping a quaternary sea urchin like medium-entropy NiCoFe layered double hydroxide (Ce 1.2 -NiCoFe-LDH) nanoshe et s were obtained by employing a doping engineering strategy. Characterization experimental results confirmed that Ce dopants could modify the oxygen vacancy structure of NiCoFe-LDH, accelerating charge and mass transfer. thereby enhancing the urea decomposition. The electrochemical results indicated that Ce 1.2 -NiCoFe-LDH demonstrated high-efficiency catalysis for UOR, characterized by high intrinsic activity, rapid kinetics, and robust durability. The overpotential of Ce 1.2 -NiCoFe-LDH was only 48 mV at the current density of 10 mA cm −2 , much lower than the commercial IrO 2 (126 mV at 10 mA cm −2 ). The tafel slope of Ce 1.2 -NiCoFe-LDH (62 mV dec −1 ) was also better than those of IrO 2 (88 mV dec −1 ) and NiCoFe-LDH (99 mV dec −1 ). Compared with the commercial IrO 2 , the Ce 1.2 -NiCoFe-LDH exhibited a change of only 3.2 % after a 12-hour chronoamperometric test, indicating an improvement in stability. Impedance comparison between the two hydrotalcites revealed that Ce 1.2 -NiCoFe-LDH possessed lower impedance, potentially enhancing catalytic efficiency. Therefore, this work illustrates that the modulation of oxygen vacancies in electrocatalysts, induced by the heteroatom doping effect, can enhance the electrocatalytic oxidation performance of small molecules for hydrogen production.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Youwei Cheng,Lian Zhu,Yaqiong Gong
Metal-organic frameworks (MOFs) are widely recognized as precursors or sacrificial templates for the synthesis of target catalysts on account of their high porosity and high active surface area . Elemental doping strategy is considered as an effective method for the synthesis of efficient and stable catalysts for electrolytic water. Therefore, in this paper, Ce-doped Ni(OH) 2 nanoparticles and Ni-MOF nanosheets composites were synthesized by electrodeposition using Ni-MOF as precursor. Catalyst Ce–Ni(OH) 2 @Ni-MOF/NF displays excellent OER performance, requiring only 193 mV and 279 mV overpotentials to realize current densities of 10 mA cm −2 and 100 mA cm −2 , respectively, while the UOR performance was very remarkable, only a potential of 1.28 V was demanded to reach a current density of 10 mA cm −2 . In addition, no obvious change in the overpotential was noticed during the stability test of 16 h, indicating good stability of Ce–Ni(OH) 2 @Ni-MOF/NF. This study provides a meaningful reference for the design of an efficient and stable environmental friendly electrocatalyst .
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INDUSTRIAL CROPS AND PRODUCTS
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2024
·
IF 5.6
Mengqing Zhou,Xialin Ji,Changzhou Chen,Liangliang Zhang,Jianchun Jiang
Through the utilization of diverse technological processes, lignin could be transformed into a multitude of valuable chemicals and fuels. This transformation not only reduces our dependence on fossil energy but also fosters the promotion of environmental sustainability. In this study, Ce metal was incorporated into the zeolite imidazolium framework-67 (ZIF-67) using the impregnation method to prepare a series of bimetallic catalysts . Using isopropanol solvent as the hydrogen source, guaiacol was effectively converted to cyclohexanol with over 80.0% selectivity over the optimum catalyst at 240 °C, 1.5 MPa N 2 , for 4 hours. The prepared catalysts were subjected to characterization methods such as BET, SEM, XPS , TEM , XRD , H 2 -TPR and NH 3 -TPD. The results of the characterization show that the addition of Ce changed the zeolitic imidazolium ester backbone structure of ZIF-67 and encouraged the emergence of more oxygen vacancies , which strengthened the catalyst hydrodeoxygenation activity and reducibility . Based on the findings of the catalytic performance tests and a retesting, the reaction pathway of the guaiacol hydrodeoxygenation process was suggested.
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Materials Today Chemistry
·
2025
·
IF 6.7
Jiaxu Zhao,Weilong Du,Dan Su,Xiaoyan He,Xiuqin Bai
Biofilms attached to various surfaces can lead to significant adverse effects in multiple areas. Cerium metal-organic framework (Ce-MOF) can function as haloperoxidase; however, their initial activity is relatively low. This study proposes a post-treatment method to enhance their enzymatic activity through the oxidation of the initial Ce-MOF. The research elucidates the haloperoxidase activity and anti-biofilm properties of Ce-MOFs. The synthesized Ce-MOFs exhibit a nanorod structure. The oxidized Ce-MOFs demonstrate substantial haloperoxidase activity, even in an alkaline environment. Both the initial and oxidized Ce-MOFs demonstrate exceptional antibacterial properties, with a concentration of 50 mg/L effectively eliminating bacteria within 30 min. The oxidized Ce-MOFs benefit from improved haloperoxidase activity, resulting in a significantly enhanced ability to inhibit biofilm formation and, consequently, improved anti-biofilm performance. This research offers methods for regulating the haloperoxidase activity of Ce-MOFs for marine antifouling applications.
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Materials
·
2024
·Vol. 17
·期 6
·1258
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IF 3.1
Min Liu,Yansen Zhang,Song Hu,Guohong Zhou,Xianpeng Qin,Shiwei Wang
Ce-doped gadolinium gallium aluminum oxide (Ce: GGAG) precursors were first prepared by the microwave-assisted homogeneous precipitation method (MAHP). Thermal gravity-differential thermal analysis (TG-DTA), X-ray diffraction (XRD), specific surface area analysis (BET) and field emission scanning electron microscopy (FE-SEM) were employed to investigate the crystal structure, phase evolution and morphologies of the Ce: GGAG precursors and powders. The influence of Ga ion concentration in the salt solution on the properties of Ce: GGAG powders was investigated. All the precursors were transformed into single-phase GGAG after being calcined at 950 °C in a furnace for 3 h. Monodispersed Ce: GGAG powders were obtained as the Ga ion concentration was lower than 0.06 mol/L. Single-phase and dense Ce: GGAG ceramics were obtained after sintering at 1600 °C in a flowing oxygen atmosphere for 10 h. Specifically, the Ce: GGAG ceramic reached its maximum density of ~6.68 g/cm3, which was close to its theoretical density of 6.70 g/cm3, and exhibited the highest optical transmittance of 65.2% at 800 nm after hot isostatic pressing sintering (HIP) as the Ga ion concentration was 0.02 mol/L. The decay time and light yield of the GGAG ceramic were 35 ns and 35,000 ± 1250 ph/MeV, respectively, suggesting that Ce: GGAG ceramics prepared using MAHP-synthesized nanopowders are promising for scintillation applications.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Jin Liang,Tian Lei,YaXi Zhang,Ye Yuan,Guang Yang,Li Zhang
Metal–organic frameworks (MOFs) have gained widespread recognition as versatile catalyst precursors owing to their unique structural merits and straightforward synthetic accessibility. Herein, the UiO-66(Ce)/ZIF-67 composite MOF precursor was constructed through a hybridization strategy, and subsequently transformed into a nonprecious metal sulfide catalyst (denoted as CeS/CoSx) employing hydrothermal sulfidation. Benefiting from the CeS/CoSx architecturally engineered hollow polyhedral nanocage structure and strong electronic interaction between CeS and CoSx, the composite catalyst demonstrates significantly accelerated electron transfer kinetics and outstanding catalytic activity. In 1.0 M KOH, CeS/CoSx only necessitates an overpotential of 143 mV to achieve a current density of 10 mA cm–2 for the hydrogen evolution reaction (HER). Regarding the oxygen evolution reaction (OER), overpotentials of 250 and 291 mV were required to attain current densities of 10 and 50 mA cm–2, respectively. Remarkably, the assembled CeS/CoSx||CeS/CoSx two-electrode overall water splitting system requires only 1.60 V to achieve a current density of 10 mA cm–2. Moreover, during the 40 h continuous electrolysis test, the potential fluctuation remained within 1%. This study provides an effective strategy for designing high-performance, dual-MOF-derived sulfide composite bifunctional electrocatalysts.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-13
·
IF 15.7
Xu Linsheng,Qin Tian,Li Yuanfeng,Guo Hao,Hu Qiao,Xiong Jing,Ma Yaxiao,Zhang Peng,Yu Xiaolin,Liu Xi,Liu Yunpeng,Zhao Zhen,Zou Jianping,Wei Yuechang
Simultaneous oxidation of soot and CH 4 emitted from natural gas-diesel dual fuel engine is a new challenge. Herein, a robust catalyst of binary Ru-Pd components supported on three-dimensional ordered macro-mesoporous cerium-zirconium oxide (RuPd/3DOMM-CZO) is elaborately constructed. Ordered macro-mesopore structure in novel hierarchical porous cerium-zirconium oxide can respectively enhance mass transfer of soot and gaseous reactants, and binary Ru-Pd active components can improve activation for NO and CH 4 . RuPd/3DOMM-CZO catalyst exhibits excellent catalytic performance and stability during simultaneous soot and CH 4 oxidation. Based on the results of characterizations and theoretical calculations, Ru site in binary Ru-Pd components is responsible for catalyzing NO oxidation to NO 2 , which is key step of NO x -assisted soot oxidation mechanism, while Pd site can activate the C-H bond of CH 4 for boosting oxidation to CO 2 ; the catalytic cooperation between Ru and Pd atoms can promote the rate-determining step to realize simultaneous oxidation of soot and CH 4 .
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xue Luo,Yingying Xue,Leilei Xu,Linshui Lian,Cai-e Wu,Yan Cui,Weixin Zou,Lin Dong,Fei Gao,Mindong Chen
This study presents a systematic investigation into the catalytic oxidation of toluene using metal–organic framework (MOF)-derived porous metal oxide catalysts obtained through controlled pyrolysis. The MOF-derived catalysts (Mn3O4-BTC, CeO2-BTC, Co3O4-BTC) demonstrated remarkable improvements in catalytic activity and stability compared to their commercial counterparts (Mn3O4-c, CeO2-c, Co3O4-c), achieving 90% toluene conversion (T90) at significantly lower temperatures of 240 °C, 241 °C, and 237 °C, respectively. Besides, a comprehensive suite of characterization techniques was employed to elucidate the structure–activity relationships. Specifically, various traditional and in situ characterization techniques, including X-ray diffraction (XRD), N2 physisorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), H2 programmed reduction (H2-TPR), online-tandem thermogravimetry-mass spectrometry (online-tandem TG-MS), and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS), were employed to elucidate crystallinity, porosity, morphology analysis, probe surface chemistry, redox properties, real-time tracking of thermal decomposition, and reaction mechanisms during the catalytic oxidation of toluene. It was found that the enhanced catalytic performance could be attributed to the synergistic effects of a high surface area, well-dispersed active sites, and abundant oxygen vacancies. These insights provided fundamental insights into the design and optimization of MOF-derived catalysts for efficient volatile organic compounds (VOCs) abatement in environmental catalysis.
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ADVANCED ENGINEERING MATERIALS
·
2025
·
IF 3.3
Qiaoyun Liu,Yifeng Yu,Yuhang Liu,Liangjie Yuan,Zheng Wang,Baiwen Qi,Aixi Yu
As the most abundant rare earth element, cerium (Ce) can endow implanted bone repair materials with excellent performance. With magnesium phosphate composite material (MPC) as models, Ce is introduced to improve the osteogenic induction of MPC. A series of Ce-doped MPC (CMPC) with Ce molar ratios of 1, 3, and 5% can be successfully synthesized by the precursor method. The obtained results indicate that CMPC has advantages such as reliable biosafety, excellent osteogenic activity, and excellent mechanical properties. When the content of Ce is 1%, the synergistic effect of Ce 4+ and Mg 2+ released from CMPC-1 is more conducive to promoting cell proliferation and enhancing osteogenic activity, which can accelerate the deposition of calcium junctions and promote the repair of bone defects. These results will provide new routes to improve the bioactivity of CMPC, thereby promoting its clinical application research.
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CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Rushuo Li,Tao Ban,Danfeng Zhao,Fajie Hu,Jing Lin,Xiubing Huang,Zhiping Tao,Ge Wang
Defect engineering improves the catalytic performance of metal-organic frameworks (MOFs) loaded metal nanoparticles (MNPs@MOFs), but there is still a challenge in defining the structure-activity relationships. Herein, the content of linker-missing defects in UiO-66(Ce) was systematically regulated via formic acid as the modulators, and defective UiO-66(Ce) loaded Ni nanoparticles (NPs) were constructed for dicyclopentadiene (DCPD) hydrogenation. The fine regulation of defect engineering and reduction conditions affected the structure properties of UiO-66(Ce) and the electronic metal-support interaction between MOFs and Ni NPs, thereby optimizing the microenvironment and electronic state of Ni NPs. The optimized U(Ce)-40eq with suitable defects, small size and structure stability effectively promoted the production of highly dispersed abundant electron-deficient Ni 0 active sites, enhancing the adsorption and activation of H 2 and C=C bonds, especially accelerating the rate-determining step. Therefore, U(Ce)-40eq loaded 5 wt% Ni NPs achieved DCPD saturated hydrogenation to tetrahydrodicyclopentadiene (70 °C, 2 MPa, 90 min), superior to most high-loading Ni-based catalysts. This work reveals the synergistic mechanism of MOFs defect engineering and electronic structure of Ni NPs, providing effective guidance for the precise preparation of highly efficient and stable MNPs@MOFs heterogeneous catalysts.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Chaoting Shi,Ninghan Tang,Shan Pu,Hui Xin,Lan Wu,Xiandeng Hou
Metal-Organic Frameworks (MOFs) have been widely used for the antibiotic pollution control. However, it remains a challenge to simple design and synthesis of multifunctional MOFs for sensing and degradation antibiotics. Herein, a multifunctional UiO-66(Zr/Ce)-NH 2 ratiometric fluorescence sensing and photocatalytic degradation platform was rapidly and simply constructed at room temperature by a one-pot method using a dielectric barrier discharge device. The mixed-metal centers and mixed-ligands of this platform enabled effective ratiometric fluorescence sensing of tetracycline (TC), along with a visual fluorescence shift from blue to yellow-green color. The platform demonstrated a detection of TC ranged from 200 nM to 15 μM, with a detection limit of 43 nM. Moreover, the UiO-66(Zr/Ce)-NH 2 exhibited strong light absorption and efficient photogenerated carrier separation, thus offering excellent degradation performance of TC compared with that of MOFs with single metal center, mixed ligands or mixed metal centers. The mechanism of fluorescence detection and potential charge transfer pathways by the UiO-66(Zr/Ce)-NH 2 were analyzed. This work provided a new approach for the simple design and synthesis of multifunctional MOFs platforms.
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