CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yi-Ran Du,Yi-Yu Tao,Jing-Wen Sun,Han-Sheng Li,Rui Zhang,Bao-Hua Xu
Despite great progress on the heterogeneous catalytic methoxycarbonylation of alkenes, the research on long-chain substrates is yet undeveloped. In this study, an efficient protocol was built by introducing 1-butyl-3-methylimidazole chloride (BmimCl) additive to the catalytic system of ceria-supported Ru clusters (Ru-CeO 2 ), providing the aliphatic esters with yields over 80 %. Experimental results combined mechanism studies demonstrated that the adsorption of chloride ion at oxygen vacancy (Vö) of CeO 2 during the catalysis delivered surfaces with reduced local concentration of Vö and electron-richer Ru sites. The synergistic effect between Vö and chloride ion boosted methanol (CH 3 OH) dissociation, providing higher coverage of dissociated CH 3 O species with lower adsorption energy and thereby accelerating the rate-limiting step of methoxycarbonylation. Importantly, the β-H elimination for competitive isomerization process was greatly inhibited on the electron-richer Ru sites. Meanwhile, the side hydrogenation was further suppressed by the restrained freedom of adsorbed H at such surfaces. These positive effects jointly offer a heterogeneous catalytic system of both efficient and selective on the challenging long-chain alkene substrates, taking methyl-4-pentenoate and chain alkenes with 6, 8, 10 and 12 carbon atoms as examples.
研究领域:
多相催化
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有机合成
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表面化学
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材料科学
·
化学反应工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2021
·
IF 5.268
Yuyan Yan,Yafei Hou,Huijun Zhang,Wenqing Gao,Renlu Han,Jiancheng Yu,Long Xu,Keqi Tang
Chemodynamic therapy (CDT) is an emerging tumour-specific therapeutic technology. However, the relatively insufficient catalytic activity of CDT agents in the tumour microenvironment (TME) limits their biomedical application. In addition, severe hypoxia and glutathione (GSH) overexpression in the TME greatly limit the antitumour efficiency of monotherapy. Herein, a cancer cell membrane-camouflaged and ultrasmall CeO 2 -decorated MnO 2 (mMC) composite is developed for amplified CDT, photodynamic therapy (PDT) and photothermal therapy (PTT). Due to the homotypic targeting ability of cancer cell membranes, mMC nanoparticles preferentially accumulate in tumour tissue. In the TME, CeO 2 acts as a highly efficient CDT agent to convert endogenous H 2 O 2 to toxic reactive oxygen species (ROS) for killing cancer cells. Meanwhile, MnO 2 irradiated with near-infrared (NIR) light displays prominent hyperthermia and ROS generation performance to perform PTT and PDT. Moreover, MnO 2 can produce oxygen to ameliorate hypoxia and deplete GSH to relieve the antioxidant capability of tumours, which is beneficial to the simultaneous augmentation of PDT and CDT. Most importantly, the catalytic activity of CeO 2 was greatly improved by hyperthermia. Consequently, a significantly enhanced therapeutic efficiency was obtained by the above multiple synergistic effects. This work provides a proof of concept for amplified tumour therapy by synchronously self-supplying oxygen, consuming GSH, and enhancing catalytic activity.
研究领域:
生物医学工程
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肿瘤治疗研究
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Shuoshuo Yang,Hailing Li,Zhonghong Gao
As a critical factor in bone regeneration, oxidative stress affects the effectiveness of implantation seriously. Construction of bioactive coatings with ideal antioxidative and osteogenic activities is essential for the repair of bone injury. Here, inorganic cerium oxide nanoparticles (CeO2NPs) and organic baicalein (BAI)-modified bovine serum albumin (BSA) were used as assembly units to fabricate (CeO2NPs/BAI-BSA)4 coating via the layer-by-layer self-assembly technique. The drug-loaded CeO2NP coating obviously promoted cell adhesion and spreading of MC3T3-E1 cells in the early stage. Moreover, the CeO2NPs/BAI-BSA coating could scavenge both ABTS+• and DPPH• free radicals, and exhibited good antioxidative effect at the cellular level against the negative effect of oxidative stress. In addition, CeO2NP-based coatings exhibited good blood compatibility with low platelet adhesion and almost no damage to erythrocytes. The composite coatings of CeO2NPs and BAI-BSA have antioxidative, osteogenic, and blood-biocompatible properties, serving as a promising strategy for bone repair under oxidative stress.
研究领域:
生物材料
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组织工程
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生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA SCRIPTA
·
2023
·Vol. 98
·期 11
·115027
·
IF 2.9
Deyang Ning,Jiaxiong He,Junqi Li,Zuoyu Liu,Renjie Liao,Yuanpei Lan,Fan Wang,Zhou Zou
In this work, three synthesis methods including photo-chemical, precipitation and hydrothermal were applied for synthesizing CeO2/TiO2 catalysts, and the catalytic performance including photodegradation degrees for organic pollutant and ammonia selective catalytic reduction (NH3-SCR) for NO removal were investigated. It was found that the photo-chemical synthesized CeO2-TiO2-PC exhibited the best photodegradation ability for methylene blue (MB), which had the degradation ratio of 91.21% and was approximately 23.92% higher than that with the matrix of rutile TiO2. The formed Ce-Ti heterojunction enhanced the separation of e−/h+ and further promoted the photocatalytic properties. Moreover, the CeO2-TiO2-PC, and the CeO2-TiO2-P which synthesized by the precipitation method showed better NH3-SCR properties than that of hydrothermal synthesized CeO2-TiO2-H below 300 °C, while the CeO2-TiO2-H owned an outstanding NH3-SCR performance above 300 °C. The difference on the NH3-SCR properties may be major attributed to the acid sites, pore structures and surface areas on the surface of different catalysts.
研究领域:
环境科学
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材料科学
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催化
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-14
·
IF 3.159
Duan Dong,Hao Chunxi,Wang Liqun,Shi Wenyu,Wang Haiyang,He Gege,Gao Lumei,Sun Zhanbo
A PdO/CeO 2 composite with a rod-like nanoporous skeletal structure was prepared by combining the dealloying of Al-Ce-Pd alloy ribbons with calcination. For CO oxidation and CH 4 combustion, the nanoporous PdO/CeO 2 composite exhibits excellent catalytic activity, and the complete reaction temperatures of CO and CH 4 are 80 °C and 380 °C, respectively. In addition, the composite possesses excellent cycle stability, CO 2 toxicity, and water resistance, and the catalytic activity hardly decreases after 100 h of long-term stability testing in the presence of water vapour (2 × 10 5 ppm). The results of a series of characterizations indicate that the enhanced catalytic activity can be attributed to the good dispersion of the PdO nanoparticles, large specific surface area, strong redox capacity, interaction between PdO and CeO 2 , and more surface active oxygen on PdO. The results of the characterization and experiments also indicate that the PdO nanoparticles, prepared by combining dealloying and calcination, have a stronger catalytic activity than do Pd nanoparticles. Finally, a simple model is used to summarize the catalytic mechanism of the PdO/CeO 2 composite. It is hoped that this work will provide insights into the development of high-activity catalysts.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Saudi Chemical Society
·
2022
·
IF 4.712
Feng-zhi Tan,Mu-tian Ma,Wei-jie Cai,Yong-li Chen,Yuan-hao Wang,Jing-hui Zhou
Biocarbon-supported polymetallic composites (CAS@Ni 3 S 4 /CeO 2 ) were fabricated by a facile hydrothermal process. The as-prepared CAS@Ni 3 S 4 /CeO 2 materials integrated the advantages of transition metal sulfides (good conductivity), rare-earth metal oxides (excellent stability), as well as porous carbon with high surface area, thus exhibiting promising electrochemical performance in supercapacitor applications. Indeed, the optimal CAS@Ni 3 S 4 /CeO 2 -150 composite displayed a high specific capacitance of 1364 F g −1 and impressive cycle performance with capacitance retention of 93.81 % after 10,000 cycles. The calculation of capacitance contribution showed that the satisfying behavior of the electrode was a combination of the diffusion process and the surface capacitance characteristics. Furthermore, the assembled asymmetric supercapacitor (CAS@Ni 3 S 4 /CeO 2 -150//CAS) delivered an ultrahigh energy density of 102.76 Wh kg −1 , which was better than that of the commercial activated carbon-based ASC device. This novel strategy might provide a new perspective for transition metal sulfide/rare earth metal oxide composite in the electrochemical energy storage field.
研究领域:
材料科学
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电化学
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纳米材料
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能源存储
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功能材料
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电化学能量存储
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yifu Jing,Peter Lund,Muhammad Imran Asghar,Fengjiao Li,Bin Zhu,Baoyuan Wang,Xiaomi Zhou,Chunming Chen,Liangdong Fan
CeO 2 is an oxygen nonstoichiometric material for the coexistence of redox pair of Ce 3+ and Ce 4+ , even under an oxidizing atmosphere, and its self-doping is fulfilled bases on the multivalence characteristics. It has been served in versatile applications, including fuel cells and catalysis. Excellent electrochemical performances of solid oxide fuel cell (SOFC) have been achieved at intermediate and low-temperature range based on doped cerium oxide electrolyte. In this study, we utilize its self-doping form to prepare core-shell structure bi-phase nano-composite of CeO 2 and alkali carbonate (Li 2 CO 3 , Na 2 CO 3 and K 2 CO 3 ) through a two-step synthesis method. SEM, TEM, XRD, and EIS measurements were applied to characterize the morphology, crystal size, the ionic conductivity of the electrolyte, and the electrochemical performance of resulting ceramic fuel cells . An exceptional ionic conductivity of 0.34 S cm −1 was generated at 550 °C in air, significantly different from its insulating property of the perfect CeO 2 phase. A power density of 910 mW cm −2 was also achieved as the highest electrochemical performance of a single cell. The multi-ionic conduction behavior of CeO 2 -carbonate is also discussed. The results reveal an effective approach to develop alternative SOFC electrolyte materials for low-temperature, high-performance energy conversion applications.
研究领域:
材料科学
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电化学
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能量转换
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Fukun Li,Yang Bai,HaiXiang Hu,Guanbo Qiao,Lingzhong Li,Feng Zhang,Xuejun Zhang
Pitch-based tools are integral to computer-controlled optical surfacing (CCOS) for polishing fused silica but face limitations such as low material removal rates (MRR) and challenges in achieving atomic-level smoothing while ensuring environmental sustainability. While chemical mechanical polishing (CMP) excels in processing planar surfaces, it struggles with complex freeform geometries. CCOS addresses this gap with specialized tool head designs that enable precise machining of intricate surfaces. This study introduces an eco-friendly CeO 2 -based polishing slurry suited for CCOS with pitch tools. By incorporating green reagents, such as polyethylene glycol (PEG) and ethylene glycol (EG), and minimizing harmful chemical usage, the slurry achieves significant breakthroughs in performance. Experimental results reveal a surface roughness (Sa) of 0.075 nm, meeting atomic-level smoothing standards, alongside an MRR of 40.5 μ m /h, marking substantial improvements over traditional methods. Physicochemical analyses of the CeO 2 abrasives, including particle size, morphology, and Ce element content, revealed that abrasives with sharp edges and high Ce content are key factors for obtaining high surface quality and MRR. Molecular dynamics (MD) simulations highlight the synergistic effects of the components, optimizing chemical-mechanical interactions to enhance surface quality. These findings demonstrate the potential of green polishing technologies in advancing the precision machining of fused silica, particularly for complex geometries. The study provides a sustainable and high-performance solution for achieving atomic-level smoothing, paving the way for broader applications in precision optics.
研究领域:
材料科学
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光学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2023
·Vol. 40
·期 12
·3059-3067
·
IF 2.7
Yin Zihang,He Ruibo,Nie Fei,Wei Zhen,Jia Bo,Feng Qing,Fu Xiaolong,Zhang Wenyan
The oxygen evolution kinetics of industrial copper electrodeposition is slow, resulting in low electrocatalytic activity and high energy consumption. In this work, a quaternary composite of carbon coated active particles containing Mn, Co and Ce were prepared (Mn-Co 3 O 4 /CeO 2 @C), and Ti/Sb-SnO 2 /PbO 2 electrode doped with these active particles was prepared by co-electrodeposition. The microstructure and chemical composition of the electrode was characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffractometry (XRD). Linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and Tafel polarization curve (Tafel) were used to study the electrochemical properties of anode materials. The results showed that the doping of Mn-Co 3 O 4 /CeO 2 @C active particles promoted the crystal transition of PbO 2 , decreased the average grain size, and the doping of Ce increases the average valence state of Co. The modified titanium electrode showed excellent catalytic activity of the oxygen evolution reaction (OER) characteristics. The overpotential of the doped Ti/Sb-SnO 2 /PbO 2 anode was only 453 mV when the current density was 20 mA cm −2 in 0.5 M H 2 SO 4 solution, which is 508 mV lower than that of the undoped Ti/Sb-SnO 2 /PbO 2 anode. In simulated copper electro-deposition experiments, the cell voltage was reduced by about 400 mV, compared to the undoped Ti/Sb-SnO 2 /PbO 2 electrode.
研究领域:
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Zhiying Liu,Meiqing Shen,Shuhuan Wang,Chunjuan Zhang,Jun Wang,Wei Li,Feng Gao
To elucidate how CeO2 additives enhance the activity and stability of Cu-SSZ-13 SCR catalysts, we investigated two CeO2/Cu-SSZ-13 composite catalysts with Cu loadings of 1.0 and 2.5 wt %. These catalysts were characterized using an array of techniques, including XRD, SEM, TEM, NMR, H2-TPR, NH3-TPD, DRIFTS, DFT and SCR reactions under both steady-state and transient kinetic analysis conditions. Our findings demonstrate that CeO2 promotes low-temperature SCR by forming exchanged, isolated Ce-ions, which enhance Cu-ion coupling efficiency. External surface CeO2 particles can convert NO + O2 to surface nitrates, but these species primarily act as spectators below ∼250 °C, and do not contribute to the enhancement of low-temperature SCR activity. In contrast, these surface CeO2 particles can synergizes with Brønsted acid sites (BAS) to elevate high-temperature SCR activity. Furthermore, hydrothermal stability and sulfur resistance are improved by the presence of external surface CeO2 particles, a benefit that applies irrespective of Cu loading.
研究领域:
催化
·
环境化学
·
材料科学
·
物理化学
·
表面科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shuhong Huang,Xiaohui Zhao,Chenlong Hao,Zhixin Ma,Hui Wang,Aijia Zhang,Wanzhihan Zhang,Ling Li,Wenming Zhang
In recent years, multifunctional sensors have attracted significant attention due to their ability to detect different types of signals. However, it still remains a challenge to develop flexible materials with multiple sensing functions. Herein, we propose a strategy to fabricate multifunctional flexible textiles (PCP) that can apply piezoelectric and piezo-phototronic effects to self-powered piezoelectric sensor and photodetector (PD) by utilizing the synergistic effect of polydopamine-coated cerium oxide (CeO 2 @PDA) nanoparticles and poly (vinylidene fluoride) (PVDF). The CeO 2 @PDA nanoparticles served as local nucleating agents and photosensitizers for the PVDF, enhancing the polar crystalline phase and inducing piezoelectric effect, semiconductor, and optical process coupling in PCP textiles. The piezoelectric sensors consisting of PCP textiles produced extremely high sensitivity (1–10 kPa: 1.27 V/kPa; 10–50 kPa: 0.085 V/kPa; 50–100 kPa: 0.02 V/kPa) and significant electrical output (25.5 V and 0.37 μA). Besides, the piezoelectric sensor had extensive applications including pulse wave measurement, limb motion detection, and active voice recognition. It's especially noteworthy that the PD based on PCP textiles is sensitive for the detecting of sunlight illumination as confirmed by response time (t On = 2 s and t Off = 4.6 s). Meanwhile, the fabricated self-powered PD showed significant improvement in output current, confirming the realization of the piezo-phototronic effect in PCP textiles. In this work, the low-cost and high-efficiency multifunctional sensing materials were successfully prepared, providing a novel approach for the next generation of self-powered piezoelectric sensors and photodetectors.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Jingyi Bai,Xiaolu Sun,Gui Han,Guowang Diao
A new double-shell hollow structured material with high light harvesting and dye loading level for dye-sensitized solar cells (DSSCs) were synthesized via a one-pot hydrothermal method . When coated with TiO 2 shell, a hybrid double-shell CeO 2 @TiO 2 hollow sphere (D-CeO 2 @TiO 2 ) was performed as scattering layer in dye-sensitized solar cells, which further increase conversion efficiency from 5.27% of bare TiO 2 electrode to 7.95%. The enhancement is due to the high dye loading capacity of double shell CeO 2 hollow spheres core and high electron transport capacity of TiO 2 shell. Our work provides a feasible strategy for preparing multi-shell hollow spheres as scattering layers for high performance solar cells.
研究领域:
材料科学
·
纳米技术
·
太阳能
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）