CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Xiazhang Li,Xikai Lu,Siyuan Zhou,Chao Yao,Yongsheng Chen
The emission of volatile organic compounds (VOCs) poses severe environmental and health risks. Constructing stable atomically-dispersed catalysts for low-temperature VOC oxidation remains challenging. Herein, we report a directional photodeposition strategy to anchor atomically dispersed Pd onto an attapulgite (ATP) nanomineral supported CeO 2 composite, where the ATP facilitates the formation of abundant lattice oxygen vacancies in CeO 2 . Under light irradiation, surface oxygen vacancies migrate and interact with Pd species, enabling selective coordination and reductive deposition. The 0.1%Pd/CeO₂/ATP catalyst achieves 99% toluene conversion at 205 °C (T₉₉ = 205 °C) at a gas hourly space velocity (GHSV) of 20,000 mL·g −1 ·h −1 . In situ experiments and DFT calculation reveal that atomically dispersed Pd atoms form stable Pd–O–Ce bonds with oxygen vacancies sites on the CeO 2 surface, effectively modulating the electronic structure of the active sites . These atomically dispersed Pd catalysts significantly enhance oxygen activation capability and the oxidation efficiency of reaction intermediates through the unique Pd–O–Ce coordination structure. This work provides valuable insights into vacancy-mediated atomic-scale engineering as a strategy for designing efficient environmental catalysis.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.7
Huijie Wang,Jiaxin Li,Zixiang Jiao,Xiaodan Zheng,Wei Ma,Kesheng Cao,Lingwei Xue,Fu Xu,Yang Wan,Yangyang Yang,Binrong Li,Pengwei Huo
The efficient removal of antibiotic residues such as tetracycline (TC) from water remains challenging. Research has demonstrated that heterogeneous systems utilizing photocatalysis to activate peroxymonosulfate (PMS) exhibit exceptional performance. However, preparing materials with strong charge transfer capabilities and stability still poses certain challenges. This study developed a Cu x O/CeO 2 heterojunction composite with abundant oxygen vacancies (O V ) for visible-light-driven activation of peroxymonosulfate (PMS). The hierarchical flower-sphere structure of CeO 2 provides ample adsorption sites and mass transfer channels, while the synergy between the heterojunction interface and the dual redox cycles of Cu + /Cu 2+ and Ce 3+ /Ce 4+ significantly enhances visible-light absorption and accelerates the separation and transfer of photogenerated carriers. Femtosecond transient absorption (fs-TA) spectroscopy further confirms that the formation of the heterojunction effectively regulates the direction of carrier transfer and prolongs the charge lifetime. Density functional theory (DFT) calculations reveal that O V markedly promote the adsorption and activation of PMS. Under visible light irradiation, the system achieves a TC degradation efficiency of 99.2% within 60 min, primarily driven by sulfate radicals (SO 4 •− ) and hydroxyl radicals (•OH), with the intermediates exhibiting generally low toxicity. In addition, in-situ infrared spectroscopy (in-situ FT-IR) further confirmed the outstanding TC adsorption capacity and degradation activity of the Cu x O/CeO 2 heterojunction composite. This work provides insightful perspectives for designing efficient and stable heterojunction catalysts through defect and interface engineering for water purification.
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Advanced Healthcare Materials
·
2026
·
IF 9.6
Ziyan Liu,Xuetong Wang,Ziyang Liu,Jing Jiang,Xiao Lin,Zhe Xiao,Ping Zhang,Huan Zhou,Lei Yang
Precise control of reactive oxygen species (ROS) is indispensable during tissue repairing. Inorganic nanozymes such as cerium dioxide (CeO 2 ) have emerged as potent ROS modulators, however, their fixed catalytic activity prevents on-demand adaptation to the rapidly changing immune microenvironment. Here, we reported a magnetically responsive dynamic antioxidant system that autonomously tunes its ROS-scavenging capacity on demand. Selenium (Se) doping was first exploited to engineer high-density oxygen vacancies (Vo) in the CeO 2 lattice, enabling the nanozyme intrinsic antioxidant activity enhancement. Its catalytic efficiency could be further amplified under a static magnetic field (SMF). In vitro analysis revealed that Se-CeO 2 under SMF significantly promoted the polarization of macrophages toward the pro-regenerative M2 phenotype. The as-prepared Se-CeO 2 was subsequently loaded into a sodium alginate–hyaluronic acid hydrogel (SCSH-Gel), witnessed to protect chondrocytes and fibroblasts from oxidative stress in vitro. Followed in vivo tests found SMF and Se-CeO 2 synergistically accelerate neocartilage formation in a cartilage defect model and promoted re-epithelialization in a full-thickness skin-wound model. Collectively, our results demonstrated that Se doping coupled with magnetic actuation enables inorganic nanozymes to dynamically modulate ROS homeostasis, offering a versatile strategy for precisely programming the microenvironment to facilitate tissue regeneration.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 16
·13925-13930
·
IF 2.324
Li Tianjing,Shi Qingle
In this paper, explain a new relationships between Bi 3+ content, the phase crystal, microstructure and conductivity for Sm and Bi co-doped Ce 0.8− x Sm 0.2 Bi x O 1.9−1/2 x ( x = 0, 0.05, 0.1, 0.15, 0.2) electrolytes prepared by co-precipitation method. The XRD patterns showed that this compounds exhibit a fluorite-type cubic structure after the samples calcined at 700 °C for 4 h and the cell volumes of increased when the Bi content increased. In addition, for the samples sintered at 1400 °C for 4 h, the Bi doping improves the relative density, the grain size and the average thermal expansion coefficient (TEC). More in details, the relative density and TEC increase with the Bi content. Form the AC impedance spectroscopy measurements, the conductivity of the sintered samples is found to improve with the increasing of Bi content (for x ≤ 0.15), which is ascribed to the increasing of the number of oxygen ion vacancies and the increase in the unit cell volume. However, the conductivity decreases when the Bi content is further increased (0.15 < x ≤ 0.2), which is ascribed the reduction of the number of free oxygen vacancies. The highest conductivity at 800 °C is 5.6 × 10 −2 S/cm and the activation energy is 0.83 eV for Ce 0.65 Sm 0.2 Bi 0.15 O 1.825 , indicating that this would be a promising electrolyte for the intermediate temperature-solid oxide fuel cell applications.
研究领域:
材料科学
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无机非金属材料
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固态离子学
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能源材料
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燃料电池
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ACS Applied Energy Materials
·
2023
·
IF 6.4
Jun-Ke Liu,Zu-Wei Yin,Wei-Chen Zheng,Jing Zhang,Sai-Sai Deng,Zhen Wang,Li Deng,Shi-Jun Xie,Zong-Kui Liu,Maxim Avdeev,Fengjin Qu,Wang Hay Kan,Yao Zhou,Jun-Tao Li
A Ni-rich layered oxide, one promising cathode for lithium-ion batteries (LIBs), exhibits the advantages of low cost and high capacity but suffers from rapid capacity loss due to bulk structural instability and surface side reactions. Herein, a simple synchronous dual-modification strategy with Zr4+ doping and CeO2 nanowelding is proposed to address such issues. Utilizing the migration energy difference of Zr and Ce ions in layered structures, one-step high-temperature sintering of LiNi0.8Co0.1Mn0.1O2 particles with Zr and Ce nitrate distributions enables simultaneous doping of Zr ions in the bulk and CeO2 surface modification. Therein, Zr ions in the bulk occupying the Li sites can improve the Li+ diffusion rate and stabilize the crystal structure, while CeO2 on the surface provides nanowelding between the grain boundaries and resistance to electrolyte erosion. Theoretical calculations and a series of structure/composition characterizations (i.e., neutron scattering, in situ X-ray diffraction, etc.) validated the proposed strategy and its role in stabilizing the Ni-rich cathodes. The synergistic effect of Zr4+ doping and CeO2 nanowelding enables an impressive initial capacity of 187.2 mAh g–1 (2.7–4.3 V vs Li/Li+) with 86.1% retention after 200 cycles at 1 C and rate capabilities of 146.6 and 127.3 mAh g–1 at 5 and 10 C, respectively. Upon increasing the testing temperature to 60 °C, the dual-modified Ni-rich cathode exhibits an initial discharge capacity of 203.5 mAh g–1 with a good retention of 80.8% after 100 cycles at 0.5 C. The present strategy utilizing the migration energy difference of metal ions to achieve synchronous bulk doping and surface modification will offer fresh insights to stabilize layered cathode materials for LIBs, which can be widely used in other kinds of batteries with various cathode materials.
研究领域:
材料科学
·
电化学
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储能
·
电池技术
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Journal of Environmental Sciences
·
2015
·
IF 2.002
Lei Chen,Zhichun Si,Xiaodong Wu,Duan Weng,Zhenwei Wu
A MnO x –NbO x –CeO 2 catalyst for low temperature selective catalytic reduction (SCR) of NO x with NH 3 was prepared by a sol–gel method, and characterized by NH 3 –NO/NO 2 SCR catalytic activity , NO/NH 3 oxidation activity, NO x /NH 3 TPD , XRD , BET, H 2 -TPR and in-situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). The results indicate that the MnO x –NbO x –CeO 2 catalyst shows excellent low temperature NH 3 -SCR activity in the temperature range of 150–300°C. Water vapor inhibits the low temperature activity of the catalyst in standard SCR due to the inhibition of NO x adsorption. As the NO 2 content increases in the feed, water vapor does not affect the activity in NO 2 SCR. Meanwhile, water vapor significantly enhances the N 2 selectivity of the fresh and the aged catalysts due to its inhibition of the decomposition of NH 4 NO 3 into N 2 O.
研究领域:
环境催化
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大气污染控制
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材料化学
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表面科学
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化学工程
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ChemCatChem
·
2026
·Vol. 18
·期 15
·e71008
·
IF 4.1
Jian Wang,Youlin Liu,Zongchang Zhang,Yingying Qian,Lei Dong,Yuesong Shen
In this study, PdAu nanoparticles anchored on CeO 2 hybridized hollow mesoporous carbon sphere (PdAu-CeO 2 /OHCS) has been fabricated by nanocasting, low temperature oxidation, and wet chemistry approach. As-prepared PdAu-CeO 2 /OHCS catalyst exhibits excellent catalytic activity for the formic acid dehydrogenation (FAD) without additives, showing a high initial turnover frequency (TOF) of 4104 h −1 at 298 K and initial superior TOF of 15988 h −1 at 323 K. This outstanding catalytic activity can be attributed to the fact that low-temperature oxidation can enhance the hydrophilicity of HCS and increase abundant oxygen-containing functional groups, facilitating the formation and uniform distribution of smaller PdAu nanoparticles. Moreover, the introduction of CeO 2 hybridizes with OHCS, which further modulates the electron structure of the catalyst, thus further promoting the activity of FAD. This work provides a feasible idea into fabricating efficient heterogeneous catalysts for FAD. Graphical PdAu nanoparticle anchored on CeO 2 hybridized hollow mesoporous carbon sphere has been fabricated by nanocasting, low temperature oxidation, and wet chemistry approach. As-prepared catalyst exhibits excellent catalytic activity for formic acid dehydrogenation, showing a high initial turnover frequency (TOF) of 15988 h −1 at 323 K.
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Coatings
·
2026
·Vol. 16
·期 9
·1053
·
IF 3.4
Mingkun Han,Junxin Song,Jiahao Tian,Keqi Wu,Xuewei Zhu,Xiaofeng Wei
Polytetrafluoroethylene/Polyetheretherketone (PTFE/PEEK) corrosion-resistant coatings were prepared on the surface of 7075 aluminum alloy by the electrostatic powder spraying technique (EPST). To achieve a denser microstructure and improved hydrophobic properties, we introduced nano-CeO2to fill the coatings and analyzed the mechanism of its effect on the different coating structures. The corrosion resistance of the coatings was evaluated using NaCl immersion. The results indicate that nano-CeO2enhances the coatings by filling local defects and forming a denser microstructural barrier, thereby improving the hydrophobicity and corrosion resistance of the composite coatings. Additionally, the addition of nano-CeO2to the 20 µm PTFE/PEEK composite coating increases structural heterogeneity and pore defects, reduces coating densification, and facilitates the penetration of corrosive media, thereby weakening the barrier capability of the coating. However, in the 50 µm PTFE/PEEK/CeO2composite coating, nano-CeO2particles fill part of the pre-existing defects and improve coating densification, thereby increasing the resistance to the penetration of corrosive media through the coating. This enhanced barrier effect delays the contact of corrosive media with the substrate and improves the corrosion resistance of the coating. In this study, the 50 μm PTFE/PEEK/CeO2composite coating with a nano-CeO2content of 0.5 wt.% exhibited the best corrosion resistance, with a corrosion current density of 8.02 × 10−4μA·cm−2, while |Z|0.01Hzremained above 106Ω·cm2after 720 h of immersion in NaCl solution.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xinyang Liu,Fengyu Wu,Tongbo Zhang,Fenyang Tian,Menggang Li,Weiwei Yang,Yongsheng Yu
The multi-interface structure plays a crucial role in facilitating the effectiveness of electromagnetic wave (EMW) absorption in nanomaterials. However, designing and fine-tuning such structure remain challenging due to the limited understanding of the relationship between structural characteristics and dielectric loss properties. Herein, we present a sponge-structured dual-core @ shell CoFe 2 O 4 /CeO 2 @C nanocomposite featuring abundant heterojunctions and robust dielectric-magnetic coupling networks. This design aims to attain excellent impedance matching and significantly enhance EMW absorption performance of the nanocomposite. Specifically, CoFe 2 O 4 /CeO 2 @C nanocomposite achieves an effective absorption bandwidth (EAB) of 6.13 GHz with a thickness of merely 2.2 mm. The exceptional EMW absorption performance can be attributed to the synergistic effect of multi-loss mechanisms, including interfacial polarization induced by the porous dual-core @ shell structure, oxygen vacancy defects arising from the intrinsic structural characteristics of CeO 2 and conductive loss brought by reversible migration of Co 2+ /Fe 3+ and Ce 3+ /Ce 4+ . This study offers a robust strategy for the advancement of ferrite-based composites with enhanced dielectric properties and offers novel insights for the design of broadband EMW absorbing materials.
研究领域:
材料科学
·
电磁功能材料
·
纳米复合材料
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介电性能
·
波吸收
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Small
·
2025
·
IF 12.1
Nan Wang,Bowen Liu,Zhijie Liao,Qiyu Liu,Xuliang Lin,Xueqing Qiu
Lignin catalytic hydrogenolysis offers a promising route to yield aromatic and alkane fuels for sustainable aviation. However, its widespread application is hindered by the reliance on high-pressure hydrogen and aggregation of metal catalysts during hydrogenolysis processes. Self-transfer hydrogenolysis is an attractive method to depolymerize without exogenous hydrogen, but suffers from low catalytic activity and poor stability. In this study, a nickel catalyst confined on cerium dioxide (CeO 2 ) nanocrystals with oxygen vacancy (O V ) is reported for efficient hydrogenolysis of both native and technique lignin into aviation fuel precursor under a nitrogen atmosphere. The O V in CeO 2 acts as electron-deficient sites, promoting the reduction of neighboring Ni atoms to a lower valence state. These low-valent Ni species efficiently cleave C─O bonds in lignin, while the oxygen vacancies serve as anchoring sites to suppress aggregation of metallic Ni nanoparticles. The confined Ni/CeO 2 with oxygen vacancies exhibits top-level hydrogenolysis performance with an exceptional aromatic monomer yield of 42% from eucalyptus lignin and ≈20% from technical lignin, comparable to that of commercial noble metal catalysts. This work opens up new possibilities of designing efficient catalysts to depolymerize both raw wood powder and technical lignin toward aviation fuel precursor.
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JOURNAL OF MEMBRANE SCIENCE
·
2026
·
IF 8.8
Xiangsen Xu,Qin Huang,Yajing Wu,Yiqing Zeng,Feng Zhang,Zhaoxiang Zhong,Weihong Xing
For catalytic membranes, the loading of catalysts provides the membrane substrate with novel catalytic functionality, while simultaneously inducing membrane surface reconstruction. However, the effect of such surface reconstruction on performance remains unclear. Herein, VCeTi/SiC catalytic membranes with distinct surface structures were fabricated by three distinct preparation routes. Their NH 3 -SCR activity, gas permeance, and separation performance were systematically evaluated. For both VCeTi/SiC-A and VCeTi/SiC–B, the multi-step impregnation and catalyst blockage led to significantly reduced pore sizes (7.6 μm and 5.4 μm) and poor pore size distributions. In contrast, the VCeTi/SiC–C catalytic membrane prepared by single-step solution impregnation method exhibited an optimal catalyst distribution while largely maintaining a concentrated pore size distribution almost identical to the original catalytic membrane. Benefiting from the more uniform gas flow within the carrier owing to its concentrated pore size distribution, it exhibited the widest operating temperature window for NH 3 -SCR with >90% NO conversion from 300 to 450 °C. Meanwhile, VCeTi/SiC–C also displayed the improved pore size (8.0 μm), the highest gas permeance (380 m 3 m −2 h −1 ·kPa −1 ) and the lowest filtration resistance. Furthermore, we discovered "defect-compensating effect" of dust in combined removal experiment, where dust particulates contribute to enhanced denitration performance. This work provides critical insights into the surface design of high-performance catalytic membranes for medium-high temperature gas purification applications.
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Catalysis Science & Technology
·
2024
·Vol. 14
·期 19
·5653-5661
·
IF 4.4
Yang Zhao,Wenfei Ding,Xiaochi Chen,Shuo Chen
Heterogeneous catalytic ozonation is valid for the advanced oxidation of organic pollutants in wastewater, but it is usually used in the packing bed with granular supports/catalysts with considerable fluid resistance and unsatisfactory ozone utilization efficiency in practical wastewater treatment. Herein, CeO2-modified monolithic ceramic foams (CeO2/AlCF) were developed for the efficient catalytic ozonation of refractory organic pollutants in a continuous-flow mode. The TOC removal efficiency of phenol by CeO2/AlCF was about 80% with a hydraulic retention time (HRT) of 12 min. The system also showed high TOC removal efficiencies (68%–81%) for other organic pollutants including oxalic acid, 2,4-dimethylphenol, and p-nitrophenol. The chemical oxygen demand (COD) of the biological treatment effluent of petrochemical wastewater decreased from 136 mg L−1 to 45.2 mg L−1 with a COD removal efficiency of nearly 67%. The ozone utilization efficiencies of CeO2/AlCF ranged from 53% to 73%, which were much higher than those of granular catalysts (42–68%). The quenching experiments and EPR analysis revealed that the process followed a hydroxyl radical mechanism. H2 temperature-programmed reduction (H2-TPR) analysis showed that the transition of Ce4+ to Ce3+ in CeO2/AlCF was much easier than that in CeO2 and hence had a better catalytic capability.
研究领域:
环境科学
·
材料科学
·
废水处理
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