Acta Metallurgica Sinica-English Letters
·
2024
·
IF 2.9
Zeng Yanwei,Xu Peng,Liu Guoqiang,Wang Tianguan,Lei Bing,Feng Zhiyuan,Zhang Ping,Meng Guozhe
Chloride-induced corrosion of steel reinforcement is the key factor leading to the degradation of reinforced concrete building durability. Improving the corrosion resistance of oxide scale of rebar has always been a research hotspot in the field of civil engineering materials. A ZIF-8 modified Ce–Sol–gel (ZCS) film was prepared on oxide scale of plain steel rebars by sol–gel method. It is observed that the | Z | 0.01 Hz value of the ZCS film reached 320 kΩ cm 2 , which is about 29 times higher than that of blank rebar in simulated concrete pore (SCP) solution with 0.1 M NaCl. Then, they were inserted into mortar block and curing them in a curing box at T = 20 ± 2 °C and RH = 95 ± 2% for 28 days. Subsequently, these samples were subject to electrochemical impedance spectroscopy in 3.5 wt% NaCl. The | Z | 0.01 Hz value of the rebar with the ZCS film was six times higher than that of the blank rebar after immersing for 20 days, resulting in an overall increase in corrosion resistance for rebar. The results indicated that the modification by ZIF-8 could reduce the porosity of Ce–sol–gel (CS) film and improved the “labyrinth effect” of the film. Additionally, the negative charge on the surface of ZIF-8 in alkaline condition increased the repulsion effect with Cl − , significantly reducing the sensitivity of rebar to Cl − .
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RSC Advances
·
2016
·Vol. 6
·期 101
·98945-98951
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IF 3.289
Ni Xue,Luyan Wang,Meishan Pei,Youjun He,Yankai Du,Wenjuan Guo
A new adsorbent, sodium polyacrylate (PAANa) grafted onto the surface of bentonite (Bent), was successfully synthesized by a facile and green Ce(IV)-redox process, for the removal of Pb2+ from aqueous solutions. The results indicate that by this method the original layered structure of the clay can be protected along with its cation exchange capability (CEC), leading to an improved adsorption capacity. The adsorbent (Bent–PAANa) was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and N2 adsorption–desorption isotherm studies. Subsequently the effects of pH, initial concentration and contact time on the adsorption of Pb2+ from aqueous solutions were investigated. The results of the batch experiments specifically indicate that a high adsorption capacity (149.62 mg g−1) of Bent–PAANa for the removal of Pb2+ was obtained at pH = 5, C0 = 1100 mg L−1 and 25 °C. Furthermore, the adsorption kinetics of Pb2+ onto the composite followed a pseudo-second-order kinetic model. The adsorption data fitted better to a Freundlich adsorption isotherm than a Langmuir adsorption isotherm hence confirming multilayer adsorption.
研究领域:
环境科学
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材料科学
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吸附化学
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水污染控制
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功能材料
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Nature Chemistry
·
2025
·
IF 20.2
Jiang Hongjie,Zhao Jing,Meng Qingyu,Zhao Xiao-Kun,Guo Min,Hu Han-Shi,Li Jun,Chen Ning
Metal–ligand multiple bonds are ubiquitous in coordination and organometallic chemistry. In contrast, lanthanide–carbon multiple bonds are difficult to form. The isolation of complexes containing lanthanide–carbon double bonds with terminal methyl carbene (=CH 2 ) and lanthanide–carbon triple bonds remains challenging. Here we present the synthesis of a lanthanide–carbon triple bond contained inside an endohedral fullerene cage. More specifically, we report a cerium–carbide [Ce≡CSc 2 ] cluster encapsulated inside a C 80 fullerene cage. The molecular structure of Ce≡CSc 2 @C 80 and the nature of the Ce≡C triple bond are studied through X-ray crystallography, spectroscopic analyses and quantum chemical calculations. Our data reveal a very short Ce≡C distance of 1.969(7) Å. Chemical bonding analysis suggests that the formation of the Ce≡C bond primarily arises from the stronger bonding affinity between carbon and cerium compared with scandium inside the encapsulated cluster. The fullerene cage plays a crucial role in stabilizing and protecting this trimetallic carbide cluster featuring a Ce≡C triple bond.
研究领域:
无机化学
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有机金属化学
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材料科学
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物理化学
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纳米技术
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2011
·
IF 2.089
Yu-Feng Hu,Xiao-Ming Peng,Shan Ling,Jin-Zhu Zhang,Chuan-Wei Jin
Conductivities were measured for the ternary systems Y(NO3)3 + Ce(NO3)3 + H2O, Y(NO3)3 + Nd(NO3)3 + H2O, and Ce(NO3)3 + Nd(NO3)3 + H2O and their binary subsystems Y(NO3)3 + H2O, Ce(NO3)3 + H2O, and Nd(NO3)3 + H2O at (293.15, 298.15, and 308.15) K. The measured conductivities were used to test the generalized Young’s rule and the semi-ideal solution theory. The comparison results show that the generalized Young’s rule and the semi-ideal solution theory can yield good predictions for the conductivities of the ternary electrolyte solutions, implying that the conductivities of aqueous solutions of (1:3 + 1:3) electrolyte mixtures can be well predicted from those of their constituent binary solutions by the simple equations.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
·
IF 8.3
Zhi-qiang Wang,Sonil Nanda,Gong-xun Xu,Janusz A. Kozinski,Zhen Fang
Ni–Ce bimetallic material was supported on Kaolin by impregnation, calcination, and reduction for hydrothermal gasification of crop residues at 340–400 °C and 16–30 MPa. According to orthogonal experiments, the optimal reaction conditions were determined to be 380 °C, 5 min, 0.5 g cotton stalk and 0.5 g catalyst. H 2 yield was enhanced from 1.85 mmol/g to 21.82 mmol/g, with the specific surface area increasing from 4.74 m 2 g −1 (Bulk Ni) to 26.46 m 2 g −1 (Ni–Ce/c-Kaolin catalyst), indicating that Kaolin improved the dispersion of active Ni species. The bimetallic Ni–Ce synergy is reflected by broader reduction peaks of the Ni–Ce catalyst in H 2 -TPR. The variation of cerium valence states in XPS revealed that Ce is dynamically involved in oxygen transfer, promoting catalytic activity in coexisting Ce 3+ /Ce 4+ oxides. The Ni–Ce/c-Kaolin catalyst developed in this study provides an efficient route to hydrogen production from agricultural waste, thereby demonstrating its potential for high-value conversion of sustainable biomass resources.
研究领域:
可再生能源
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催化化学
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环境工程
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生物质可持续转化
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BMC Chemistry
·
2025
·Vol. 19
·期 1
·1-14
·
IF 4.6
Zhang Qiuyun,Li Xingxin,Wu Hanhong,Xu Nian,Chen Liangfu,Chen Lianlian,Deng Taoli,Ma Juan,Zhang Yutao
Metal-organic frameworks (MOFs) are promising heterogeneous catalysts or catalyst support materials for biodiesel production due to their high surface area, tunable porosity, and diverse morphology. However, developing bimetallic MOFs that combine easy scalability, high stability, and good catalytic activity that are beneficial for large-scale synthesis and applications is still highly desirable. Herein, a fascinating bimetallic Bi/Ce-MOFs (Bi/Ce-BTC) supported heteropolyacid (HPMo) was constructed by a simple hydrothermal synthesis strategy, and its catalytic performance was evaluated in the esterification of oleic acid. A comprehensive characterization of the composite material’s structure, composition, and properties was performed using various techniques (XRD, FTIR, N 2 physisorption, SEM-EDS, TG, NH 3 -TPD, Py-FTIR, and XPS). These characterization techniques thoroughly confirm the successful impregnation of HPMo on the Bi/Ce-BTC, and it possesses a relatively large specific surface area, meso-porosity, high acidity capacity, and synergistic catalytic effect between the substrates. Catalytic experiments demonstrated that HPMo@Bi/Ce-BTC exhibited the best catalytic performance, achieving 92.7% conversion of oleic acid under optimal reaction conditions. Remarkably, the catalyst could be easily reused six times with an acceptable oleic acid conversion (79.3%). In addition, the kinetic analysis of the esterification reaction by HPMo@Bi/Ce-BTC catalyst showed pseudo-first-order kinetics, with activation energies found to be 60.9 kJ/mol. Overall, the employment of bimetallic MOFs for impregnation of active species paves a potential way for broad applications in sustainable chemical processes. Graphical abstract
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TALANTA
·
2025
·
IF 6.1
Muhammad Hussnain Afzal,Wajeeha Pervaiz,You Xu,Nomair Elahi,Zhuo Huang,Guangfang Li,Hongfang Liu
The widespread use of acetaminophen (AP) has resulted in its frequent presence in pharmaceutical waste, posing ecological and health risks. To address this, a voltametric sensor based on a bimetallic UiO-66-NH 2 metal-organic framework incorporating Zirconium (Zr) and Cerium (Ce) was developed for sensitive AP detection. The incorporation of Ce 3+ not only introduced redox active sites but also reduced the particle size from 495-650 nm in (Zr)UiO-66-NH 2 to 230–365 nm in (Zr/Ce)UiO-66-NH 2 , increasing surface area and enhancing electrocatalytic activity. The combined synergistic effect of Zr and Ce significantly improved charge transfer and enhanced oxidation current response compared to the unmodified GCE. The sensor exhibited excellent electrocatalytic performance with a wide linear range (0.072–680 μM), high sensitivity (0.496 μAμM −1 cm −2 ), and a low limit of detection (0.024 μM). In addition, the sensor exhibited excellent selectivity against interfering species and maintained stable performance over 21 days. The sensor's practical applicability was validated by testing real environmental samples, achieving recovery rates of 97–103 %, and the results were consistent with those obtained using high-performance liquid chromatography (HPLC).
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CHEMPHYSCHEM
·
2025
·
IF 2.2
Kan Hu,Dingchen Wang
The construction of efficient Z-scheme heterojunctions is considered as a promising approach to improve the transfer and separation of photogenerated carries in the field of photocatalytic hydrogen evolution from water splitting. Herein, a novel CdS/UiO-66(Ce) with Z-scheme heterostructure is successfully fabricated from metal sulfide CdS and cerium-based UiO-66 metal–organic framework via a hydrothermal method. The Z-scheme CdS/UiO-66(Ce) heterojunctions can provide abundant active centers, broaden the response range to visible-light region, accelerate the transfer of interfacial charges, and suppress the recombination rate of photogenerated electron–hole pairs. As a result, CdS/UiO-66(Ce) (ω(CdS) = 30%) exhibits a hydrogen production rate of 1.975 mmol g −1 h −1 , which is 19.1 times higher than that of UiO-66(Ce). Overall, this article may provide a new pathway for the rational design of efficient Z-scheme heterojunctions with photocatalytic hydrogen evolution. Graphical The Z-scheme heterojunction is a pivotal design strategy in photocatalysis for balancing efficient charge separation and strong redox capability. In this article, a Z-scheme CdS/UiO-66(Ce) heterojunction is constructed by combining cerium-based metal–organic framework UiO-66(Ce) with CdS and achieved efficient photocatalytic water splitting for 1.975 mmol g −1 h −1 hydrogen evolution under visible light, which is 19.1 times higher than UiO-66(Ce).
研究领域:
材料科学
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光催化
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氢能
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纳米材料
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环境科学
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Journal of Magnesium and Alloys
·
2025
·
IF 13.8
Cheng Lv,Qingjie He,Yongjin Zou,Ruoyang Zhang,Hanjie Wen,Jiayan Huang,Jing Zhi,Cuili Xiang,Lixian Sun,Yong Shen Chua
MgH 2 shows promise for solid-state hydrogen storage because of its high gravimetric capacity (7.6%) and ecofriendliness but cannot be easily commercialized because of its sluggish dehydrogenation/rehydrogenation kinetics and high thermodynamic stability. Herein, Ce/N–codoped TiO 2 (CN-T) synthesized using a solvothermal/calcination method was composited with MgH 2 to enhance its hydrogen storage performance. The composite with a CN-T loading of 7 wt% started releasing H 2 at 187.2 °C and released 6.45 wt.% H 2 in 180 s at 301 °C, which corresponded to nearly complete dehydrogenation. The residue could be rapidly rehydrogenated, with hydrogen contents of 3.24 and 5.45 wt% achieved in 1 min at 100 °C/20 bar H 2 and 5 min at 200 °C/20 bar H 2 , respectively. This performance enhancement was attributed to the combined effects of doped N, multivalent Ti, and Ce. The doped N weakened Mg–H bonds via charge transfer and modified the electronic state density of MgH 2 . Ti catalyzed H 2 dissociation/recombination through dynamic valence cycling and D-electron injection, and the introduction of Ce 3+ created O vacancies, which lowered the electron density of Mg–H bonds, generated strain fields for hydrogen release, provided diffusion pathways, and introduced bandgap states to strengthen electron–hydrogen coupling. Thus, this study paves the way for the commercialization of MgH 2 as a green high-capacity hydrogen carrier for diverse applications.
研究领域:
材料科学
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氢能
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纳米复合材料
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催化
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固态化学
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JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 5
·2725-2737
·
IF 1.938
Zhou Junxiu,Wu Tianhao,Han Yinghui,Aryana Saman
Manganese and cerium (Mn-Ce) oxides were prepared under nitrogen and high-temperature oxidation via a bath precipitation method as materials for electrode assemblies in supercapacitors. The prepared Mn-Ce oxide composite was demonstrated to have a high specific capacitance of 163.7 F g −1 with 78.4% cyclic stability after 3000 cycles at a current density of 1 A g −1 . Electrochemical impedance spectroscopy confirms that MnO 2 improves the conductivity of CeO 2 . Results from XPS analysis suggest that the introduction of MnO 2 enhances the concentrations of oxygen vacancies. Finally, band structure, density of states and Mulliken population were calculated using density functional theory, and the findings are consistent with the experimental and characterization results. Because of their excellent performances, Mn-Ce bimetallic oxides are promising electrode materials for supercapacitors. Graphic Abstract
研究领域:
材料科学
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电化学
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Xiao Wang,Tongkai Wang,Guangkuo Si,Yang Li,Shouwei Zhang,Xiaolong Deng,Xijin Xu
Surface oxygen vacancy defects (OV) are regarded to be beneficial to the gas sensing behavior by significantly improving the carrier density and providing more oxygen adsorption sites. In this work, Ce-doped α-Fe 2 O 3 composites with abundant OV defects were synthesized using an oil bath method assisted with annealing treatment. Morphological characterization results indicate that the lamellar architecture of α-Fe 2 O 3 is transformed to nanospheres composed of massive nanoparticles with small sizes (7–9 nm) after introducing Ce elements. Gas sensing results show that the FeCe10 (Fe/Ce = 10:1) sensors exhibit enhanced acetone sensing response of 26.3–100 ppm gas at the operating temperature of 220 °C toward that of pure α-Fe 2 O 3 . Most importantly, X-ray photoelectron spectroscopy and electron spin resonance spectroscopy results confirm that the sensing responses of Ce-doped α-Fe 2 O 3 sensors are directly related to the OV defects, that is, the larger the quantity of the OV defects, the higher the sensing response. The unpaired electrons trapped in OV defects can provide more active sites for adsorption of oxygen and acetone molecules, resulting in a thicker depletion layer and a higher potential barrier. Our work highlights the decisive role of OV defects in gas sensors, which can also provide a rational approach to boost the sensing performance.
研究领域:
材料科学
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传感器技术
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纳米材料
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表面化学
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半导体物理
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ADVANCED POWDER TECHNOLOGY
·
2021
·Vol. 32
·期 7
·2493-2501
·
IF 4.833
Hongling Yi,Lei Tan,Lingfeng Xia,Lingjun Li,Hongxing Li,Zengsheng Liu,Chu Wang,Zixiang Zhao,Junfei Duan,Zhaoyong Chen
The well-established LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) cathode materials possess a broad prospect for Li-ion batteries. However, the NCM523 still suffers severe capacity fading and structural instability. In this research, Ce-doped and CeO 2 -coated NCM523 cathode materials are synthesized by a smart one-step calcination process. It is found that the CeO 2 coating layer is formed during high-temperature calcination. The CeO 2 coating layers stop the electrode from being exposed to the electrolyte directly and promote the kinetics of lithium deintercalation. Besides, Ce doping could suppress the bulk cation-mixing degree. Electrochemical tests suggest that Ce-modification improves the capacity retention of cathode materials. The optimized Ce-modification cathode material, among 2.7 V and 4.6 V, not only shows the best capacity retention of 76.2%, but also delivers a discharge capacity of 178.2 mAh g −1 at 1 C. This smart modification strategy provides novel ideas for advanced LIBs.
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