MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2024
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IF 4.2
Zhihua Zhao,Shixin Ma,Abu Bakker Md Rahmatullah,Zhuo Chen,Yafang Pan,Lan Wu,Bo Huang
The generation of high levels of ammonia in industries, agricultural sectors, and water treatment plants has triggered the necessity to detect high ammonia concentrations in a flexible way to ensure proactive measures for protecting humans and the environment. Therefore, it is essential to develop highly sensitive multifunctional sensors that have long-term stability, high durability, and a large stretch range. In our work, a novel approach was developed for fabricating flexible sensors consisting of polyurethane (PU) yarn and the loaded Ti 3 C 2 T x /CeO 2 /TiO 2 (abbreviated as MTCe) nanocomposites. The structures and morphology of the yarn-shaped sensors were analysed using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and other characterisation methods. In addition, gas and strain responses were recorded and analysed using an AES-4SD flexible electronic device. The response of the yarn-shaped sensors to 100 ppm NH 3 was 42.9 % at room temperature (25 °C), indicating its excellent gas sensitivity. In addition, the sensors exhibited some key advantages, such as a large stretch range (60 %), high sensitivity (up to 385.285), and good durability (200 stretches/releases at 20 % stretch), which may be considered a remarkable achievement in the field of flexible sensor manufacturing for multiple applications.
研究领域:
材料科学
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环境科学
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传感器技术
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
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IF 4.326
Wei Guo,Huanhao Chen
Nonthermal plasma (NTP)-assisted CO2 methanation can activate and convert stable CO2 molecules under ambient conditions as compared to conventional thermal catalysis (normal operation temperature up to 450 °C), which is a good technique to reduce CO2 emissions and simultaneously utilize the renewable energies like solar and wind. It is critical to develop a robust catalyst with good catalytic performance in order to make NTP catalytic CO2 methanation more competitive. Herein, we present a simple yet efficient synthesis of CeO2-supported Ni catalysts with yttrium (Y) as the promoter (i.e., Ni–Y/CeO2) via mechanochemical synthesis for efficient NTP catalytic CO2 methanation. The developed 7.5Ni–1Y/CeO2 catalyst demonstrated the highest energy efficiency values for CO2 conversion and CH4 yield, i.e., ∼57 gCO2 kWh–1 and ∼17 gCH4 kWh–1, respectively. The CO2-TPD and HRTEM results confirmed that the doped Y positively enhanced the basicity of the catalysts and also decreased the particle size of Ni nanoparticles, thus promoting the NTP catalytic activity of CO2 methanation. The catalyst displayed excellent short-term stability for plasma catalytic CO2 methanation over a 12 h on-stream evaluation, showing a CO2 conversion of 84.2 ± 1.8% and a CH4 selectivity of 83.3 ± 1.9%.
研究领域:
化学工程
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环境科学
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催化材料
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Hui Wang,Hao Zhu,Yuelan Zhang,Jianglong Pu
A series of CTAB-templated Ni/Ce catalysts were synthesized by adding CTAB during the hydrothermal synthesis of ceria to improve the pore structure of catalysts. Their catalytic performance was evaluated in the steam reforming of acetic acid and the effects of CTAB concentration on the porous structures , reducibilities , morphology, and activity of catalysts were studied. The catalysts were characterized by BET, XRD , H 2 -TPR, XPS , HRTEM , in-situ DRIFTS , DTG , FTIR , and temperature-programmed reaction to elucidate the structure-activity relationship of the catalyst. The results showed that owing to the CTAB assistance, a high surface area of ceria could be achieved, which induced a better Ni dispersion with a smaller Ni size, strengthened the interaction between Ni and CeO 2 , and promoted the reducibility of Ni, obtaining higher activity and lower methane yield than Ni/Ce. Among these prepared samples, Ni/Ce–C6 showed the highest surface area and the best catalytic performance with a hydrogen yield of up to 82.5% even at a low temperature (550 °C). Owing to the stronger Ni-ceria interaction of Ni/Ce–C6, the lattice oxygen in ceria migrates easily to the Ni surface , interacts with the reaction intermediates, and thus improves the CO 2 /CO ratio in the products. Much more CO and CO 2 and less CH 4 were observed over Ni/Ce–C6 during the temperature-programmed reaction, indicating its high activity. In-situ DRFITS characterization demonstrated that the two types of catalysts had similar reaction intermediates but various adsorption and conversion abilities toward the acetic acid. More reaction intermediates were adsorbed at low temperatures and a higher conversion was obtained over Ni/Ce–C6 owing to its better Ni dispersion. The CTAB assistance inhibited the formation of amorphous carbon but facilitated the formation of graphitic carbon at ∼637 °C which did not induce catalyst deactivation .
研究领域:
化学工程
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催化材料科学
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DOI
高影响因子
Molecular Catalysis
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2024
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IF 3.9
Jiaqi Zhou,Qingrong Wang,Hong Liu,Ming Bao,Jiasheng Wang
Gas-phase selective oxidation of toluene with air is a promising method for producing high-purity benzaldehyde, but the yields of existing catalysts are limited, so the development of more efficient catalysts is of great importance to the chemical industry. Herein VMoNb/CeO 2 was prepared and characterized by SEM, XRD, Raman, XPS, H 2 -TPR, and NH 3 -TPD. The introduction of Mo generated V–O–Mo “asymmetric lattice oxygen” and thus brought high activity. Nb moderated the acidity and oxygen vacancy so as to improve the selectivity. The VMoNb/CeO 2 catalyst showed very high catalytic activity at 500 °C, with 35% toluene conversion and 82% benzaldehyde selectivity at an air flow rate of 30 mL/min for V:Mo:Nb =2:5:0.8. This work could serve as a reference for designing mixed metal oxide catalysts for selective oxidation of aromatic hydrocarbons.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Xingyu Zhan,Yunxiong Zeng,Bo Hong,Xinqing Wang,Yingchun Xia
Artificial photosynthesis for H 2 O 2 production through O 2 reduction is a sustainable and cost-effective technology for the scientific and industrial communities. Metal-free polymeric carbon nitride (CN) is a promising visible-light responsive semiconductive material for photocatalytic H 2 O 2 production. However, its inherently disordered and amorphous structure limits its performance improvement due to high photogenerated carrier complexation and sluggish interlayer charge transfer. Here, we report a high-performance S-type heterojunction, composed of CeO 2 coupled with N -vacancy-rich CN (CeO 2 /Nv-CN), that enhances the photocatalysis of H 2 O 2 production under visible light. The prepared CeO 2 /Nv-CN showed an H 2 O 2 generation rate of up to 69.79 mmol·g −1 ·h −1 , 48.80-fold higher than CN and had an apparent quantum yield of 13.8 % at 400 nm. A synergistic effect among CeO 2 , N -vacancies (Nv) and S-type heterojunction is responsible for such an excellent activity, which increased the O 2 and light absorption sites, built rapid charge diffusion channels, and enhanced two-electron O 2 reduction. This work demonstrates the potential of incorporating nanosized CeO 2 with CN to achieve high-performance photocatalytic H 2 O 2 production, opening new avenues for designing highly efficient polymeric composite photocatalysts for energy conservation.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2025
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IF 8.4
Junzi Huang,Mengjie Lu,Min Liu,Yahong Xie,Peng Wei,Huihui Xie,Liang Li,Weitao Han,Zhiwei Zhang,Ying Qi
The residues of tetracyclines (TCs) antibiotics present significant challenges in terms of contamination and pose a threat to human health. In this study, a cost-effective n-type semiconductor, CeO 2 , were loaded with small amounts of Au nanoparticles were fabricated by one-step hydrothermal method under alkaline conditions in the presence of the surfactant CTAB. Characterization tests revealed that Au/CeO 2 had significant visible light absorption capacity and good e − /h + separation efficiency. Photocatalytic degradation results of TC showed that 2% Au/CeO 2 -CTAB had the highest photocatalytic activity, achieving a degradation rate of 86.4% within 90 min. These values were 3.8 and 2.6 times higher than those of pure CeO 2 and CeO 2 -CTAB (without Au loading), respectively. Loading Au nanoparticles substantially increased the visible light absorption range, reduced bandgap width, and lowered photo-generated carrier recombination rate. Residual e − /h + on the semiconductor surface activating functional groups, further promoting photocatalytic degradation of pollutants such as TC. Au-loaded CeO 2 nano-photocatalysts have potential applications in the environments polluted by antibiotic residues.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
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2024
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IF 5.7
Cijun Shuai,Kangdong Wang,Shuping Peng,Jun Zan,Jiang Xiao,Shun Hu,Qi Zhong
CeO 2 nanozymes have garnered significant attention in chemodynamic therapy due to their peroxidase-like activity and ability to deplete glutathione. However, their catalytic efficiency is constrained by the low conversion rate of Ce 3+ /Ce 4+ . To overcome this limitation, the electron transfer was accelerated by introducing the transition metal Mn atom as a valence electron donor through lattice charge transfer. In detail, we introduced Ce 1-x Mn x O 2 into the poly-L-lactic acid (PLLA) scaffold fabricated by selective laser sintering. The conversion from Ce 3+ to Ce 4+ promoted the decomposition of H 2 O 2 within the tumor microenvironment to generate hydroxyl radicals with high oxidative activity, consequently inducing oxidative stress. The conversion from Ce 4+ to Ce 3+ depleted intracellular antioxidant glutathione, disrupting redox balance in tumor cells. This continuous redox cycle ultimately triggered apoptosis in tumor cells. Using a first-principles Hubbard-corrected approximate density-functional method, the analysis of the electron band structure revealed the presence of donor energy levels within the bandgap of Ce 1-x Mn x O 2 , enabling electron transfer channels around 0.645 eV. Electrochemical experiments confirmed that Ce 0.8 Mn 0.2 O 2 significantly reduced the activation overpotential from 0.907 V to 0.646 V, enhancing its redox capacity. As a result, the scaffold exhibited a threefold increase in tumor-killing rate. These findings highlight the immense potential of CeO 2 nanozymes in enhancing chemodynamic therapy for effective tumor treatment.
研究领域:
生物医学工程
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肿瘤治疗学
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产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
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2024
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IF 12.7
Dong Wang,Siping Ding,Zhenzhen He,Tonghui Zhang,Xuefen Wang
In this work, a novel Co 3 O 4 @CeO 2 nanofibrous membrane was prepared by the combination of interfacial defect engineering strategy and coaxial electrospinning for unusual levofloxacin degradation. Implanting active Co 3 O 4 into CeO 2 derived from Ce-UiO-66 created more oxygen vacancies and improved the interfacial interaction (electron transfer and specific surface area). In addition, accelerated redox recycling occurred on the catalyst surface because of the cooperation of Co sites and Ce sites. As a result, the optimal Co 3 O 4 @CeO 2 nanocomposite showed an unexpectedly improved degradation efficiency of levofloxacin with a rate constant higher than 6.9 times (CeO 2 ) and 2.6 times (Co 3 O 4 ), superior elimination (>98%) of antibiotic (norfloxacin, tetracycline and doxycycline hydrochloride) and dyes (methylene blue, rhodamine b, methyl orange and crystal violet). Moreover, C-type hollow structure nanofibers with increased reaction area were prepared by coaxial electrospinning to support nanoparticles for consecutive wastewater treatment. The prepared nanofibrous membrane with loading 50 wt% Co 3 O 4 @CeO 2 (PC50 NFMs) exhibited loose structure, resulting in 168.2 ± 12 L m −2 h −1 of permeability driven by gravity, while 164.2 L m −2 of levofloxacin was efficiently treated. Besides, the PC50 NFMs had satisfactory reusability and stability in real water bodies. This work paved a new avenue to control water pollution through the design of membranous catalysts.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
Materials Today Communications
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2024
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IF 3.7
Jianyu Xu,Cansen Liu,Ran Zhang,Xiaoqing Deng,Yaping Zhou
Developing and manufacturing novel coatings with excellent tribological performance using environmentally friendly and simple methods hold significant potential and challenge for reducing energy consumption and carbon emissions. Here, we use a gentle method to synthesize the MoS 2 -load CeO 2 nanohybrid (CeO 2 @MoS 2 ) as an additive to construct a Co-CeO 2 @MoS 2 composite coating with friction reduction and wear resistance through a low-cost electrodeposition technique. The friction measurement results show that CeO 2 @MoS 2 nanohybrid effectively reduces the friction coefficient and increases the wear resistance compared to single CeO 2 or MoS 2 . The synergistic effect of hard CeO 2 and soft MoS 2 gives the Co-CeO 2 @MoS 2 coating with an extremely low coefficient of friction of about 0.05 and a wear rate of about 3.53×10 −6 mm 3 (N·mm) −1 . In addition, the Co-CeO 2 @MoS 2 coating can maintain an extremely low coefficient of friction with long-term stability in tribological tests. This work provides a novel strategy for constructing coatings with remarkable tribological performances and promotes the application of CeO 2 @MoS 2 nanohybrid as an additive to improve material properties.
研究领域:
材料科学
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表面工程
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产品关联
DOI
高影响因子
Results in Physics
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2019
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IF 3.042
Baosong Li,Dandan Li,Tianyong Mei,Weiwei Zhang
Ni-W/ZrO 2 -CeO 2 composite coating has been fabricated via pulse electrodeposition. The structure, morphology, composition and the operating parameters of the nanocomposite coating were evaluated and optimized for the enhanced hardness and corrosion resistance. It illustrated that the deposited coatings are dense, crack-free with nodular or granular structure. The average current density of 4–6 A dm −2 , duty cycle of 70% is beneficial to the finer structure and higher content of nanoparticles in deposits. The average roughness, crystallite size and growth rate of the composite coating was examined. The hardness as a function of duty cycle, current density and deposition time were investigated. The optimal parameters for the improved performance of the composites were given. It was illustrated that the reinforcing particle phase had been uniformly co-deposited in the coating. The embedded ZrO 2 and CeO 2 particles could enhance the corrosion resistance and hardness of Ni-W metallic matrix. Ni-W/ZrO 2 -CeO 2 nanocomposite coatings possess higher performance in aggressive environment and exhibit great application values.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Jie Xu,Ming Li,Jianhao Qiu,Xiong-Fei Zhang,Yi Feng,Jianfeng Yao
As ionic liquid analogues, deep eutectic solvents (DESs) have been widely used in many fields in past decades. In this work, a PEGylated deep eutectic solvent (PEGylated DES) was used for the solvothermal synthesis of CdS@CeO 2 core-shell material for the first time. The amount of CeO 2 coating has a remarkable influence on the photocatalytic degradation of tetracycline. When the molar ratio of CeO 2 to CdS is 1:1, the degradation rate of tetracycline is 91.5% under visible light (λ > 420 nm), which is about 1.57 and 10.5 times as that of CdS and CeO 2 , respectively. The enhancement of photocatalytic performance is due to the fast separation of photogenerated electrons, the lower recombination of electron-hole pairs and the smaller band gap, which are demonstrated via UV–vis diffuse, photocurrent density, electrochemical impedance spectroscopy, photoluminescence and Mott-Schokkty measurements. This work provides a new way for the design of a core-shell metal sulfide photocatalyst that can be used in environmental remediation.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
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2022
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IF 4.632
Zhichao Shang,Yong Yu,Hang Yang,Zhongxiang Yang,Yang Xiao,Xiaohong Wang
The Cu/CeO 2 nanoporous composite material was prepared via a one-step and energy-saving method of solution combustion synthesis (SCS). The phase composition , surface morphology and optical characteristics of Cu/CeO 2 were studied. The results show that the SCS products are composed of cubic fluorite CeO 2 and Cu. Due to the generation and escape of gas during the synthetic reaction, the SCS CeO 2 shows porous structure, in which the mesopores (diameter 10–17 nm) nest in the wall of large pores (diameter 80–300 nm). X-ray photoelectron spectroscopy (XPS) outcomes indicate that the oxygen vacancy concentration of CeO 2 increases (18.97%–30.93%) with the increase of Cu concentration. The decoration of Cu greatly enhances the catalytic activity of CeO 2 nanomaterials . 30 wt% Cu/CeO 2 composite material shows the best photocatalytic activities for the degradation of methyl orange (MO) (95.99%), which is about 4.3 times that of CeO 2 at the same time (120 min). UV-vis diffuse reflectance spectroscopy (DRS) results show that the semiconductor band gap is reduced with the addition of metallic Cu, which leads to the enhancement of photocatalytic activity. The free radical trapping experiments demonstrate that ·O 2 – and h + are the main active species in the photocatalytic degradation of MO. Based on the above results, a hypothesized mechanism for enhanced photocatalysis of Cu/CeO 2 nanomaterials was proposed: the porous structure provides more reactive sites and channels for mass transfer, and the presence of metallic Cu improves the oxygen vacancy concentration of CeO 2 and then promotes charge-carrier separation, which helps enhance the photocatalytic performance of Cu/CeO 2 .
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）