JOURNAL OF RARE EARTHS
·
2019
·
IF 2.846
Guofang Zhang,Yiming Li,Xin Zhao,Jianyi Xu,Yanghuan Zhang
Fe 3+ and Zn 2+ ions were doped into the lattice of CeO 2 via the hydrothermal method . The microstructure and spectra features were analyzed systemically. XRD results show that the solid solubility of Fe 3+ and Zn 2+ ions in Ce 1– x (Fe 0.5 Zn 0.5 ) x O 2 can be identified as x = 0.16. The cell volumes are decreased by increasing the doped content. The TEM graphs prove that the grain size of the sample is about 10 nm, and the EDS result indicates that the doped contents are in accordance with that of the theory concentrations. Meanwhile, the doping also causes the increasing concentrations of the defects and oxygen vacancies which are supported by the XPS , Raman, UV and PL characterizations. The samples exhibit better catalytic activities for improving the hydrogen storage properties and the electrochemical kinetics of the ball milled Mg 2 Ni based composites. Further, the catalysis effects are improved by increasing the doped contents, which can be ascribed to the increasing contents of the oxygen vacancies, defects, the special electron transition states and the nature of the doped ions in CeO 2 -based solid solutions.
研究领域:
材料科学
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催化化学
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能源材料
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2022
·Vol. 68
·期 11
·e17834
·
IF 4.167
Wuyuan Liu,Zhaoying Wang,Ming Sun,Jiajian Gao,Lifeng Wang,Zihan Gao,Yingying Xu,Xiangyun Zhao,Cheng Zhang,Lin Yu
A series of CeO 2 modified Cu-SSZ-13 monolith catalysts were prepared by embedding CeO 2 into the washcoat of Cu-SSZ-13 monolith catalyst through solvent combustion method. These CexCu-SSZ-13 catalysts were studied in the selective catalytic reduction (SCR) of NO with NH 3 , among which the Ce2Cu-SSZ-13 catalyst exhibited the best low-temperature activity, hydrothermal stability, and sulfur resistance. The physicochemical properties of the catalysts were characterized using multiple methods. Results showed that the acidity, redox capacity, and ammonia adsorption capacity significantly enhanced after CeO 2 modification, thus leading to the high performance of Ce2Cu-SSZ-13 catalyst. Furthermore, the introduction of CeO 2 induced the fast SCR reaction by promoting the oxidation of NO to NO 2 . Analog calculation suggested that the porous structure generated via solvent combustion in the washcoat effectively increased the diffusion rate of reaction. In situ diffuse reflectance infrared Fourier transform spectroscopy ( in situ DRIFT) analysis showed that Brønsted acid sites were the main active center and the reaction followed Eley–Rideal mechanism.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 49
·73935-73945
·
IF 5.19
Li Zhangjie,Chen Yongdong,Deng Jie,Luo Li,Gao Wenxiang,Yuan Liang
In this paper, we prepared a series of Ce 1- x Ti x O 2 ( x = 0–0.20) nanorods by hydrothermal method, which were used to construct the PdCu/Ce 1− x Ti x O 2 catalysts. The Ce 1− x Ti x O 2 and PdCu/Ce 1− x Ti x O 2 samples were characterized by transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), N 2 adsorption–desorption, X-ray diffraction (XRD), inductively coupled plasma optical emission spectrometer (ICP-OES), etc. Catalytic activity, stability, and repeatability of the catalysts for methanol oxidation were investigated. The results show that doping a proper amount of titanium could strengthen the interaction between Ce 1− x Ti x O 2 support and PdCu nanoalloy, thus increasing the oxygen vacancy concentration and promoting Pd species with a higher oxidation state. These modified properties are beneficial for the deep oxidation of methanol. The light-off temperature ( T 50 ) and full-conversion temperature ( T 90 ) of methanol over the PdCu/CeO 2 catalyst are 108 °C and 159 °C, respectively. The greatest activity improvement is found for PdCu/Ce 0.9 Ti 0.1 O 2 , which shows the lowest T 50 of 88 °C and T 90 of 138 °C. Furthermore, neither PdCu/CeO 2 nor the modified PdCu/CeO 2 catalyst produces by-products and exhibit excellent stability and repeatability throughout the whole test period. This study provides a reference for in-depth understanding and designing of efficient and stable CeO 2 -based oxidation catalysts. Graphical abstract
研究领域:
催化
·
材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Sheng Wu,Renlu Han,Yuyan Yan,Wei Chen,Wenqing Gao,Yafei Hou,Keqi Tang
Recently, catalytic therapy on the basis of Fenton reaction represents a very promising paradigm for potential cancer therapy, which has inspired great research interest and got fast progress. Nevertheless, it remains challenging to fabricate nanocatalytic systems that can precisely perform catalytic activity in tumor tissues without causing toxicity to adjacent normal tissues. Herein, we designed and fabricated a porous CeO 2 nanorods that can selectively perform therapeutic activity in the weakly acidic tumor microenvironment via converting H 2 O 2 into •OH to kill cancer cells, meanwhile, the normal tissues are protected by decomposing H 2 O 2 into O 2 in the physiological environment. Specifically, benefiting from the porous structure, such CeO 2 nanorods could be loaded with Indocyanine green (ICG) that could both contribute itself to generate singlet oxygen ( 1 O 2 ) and convert near-infrared (NIR) light to hyperthermia. Once exposed to NIR light, on the one hand, the catalytic activity of CeO 2 was significantly enhanced by photothermal effect of ICG for highly efficient tumor catalytic therapy; on the other hand, the generated hyperthermia and 1 O 2 by ICG can further synergistically enhance the therapy efficiency via directing killing cancer cells. The current study provides a proof-of-concept demonstration of tumor-specific therapy with minimal non-targeted toxicity.
研究领域:
癌症治疗
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纳米技术
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材料科学
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生物医学工程
✓ 已验证
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Ming Jiang,Xiaopeng Chen,Linlin Wang,Jiezhen Liang,Xiaojie Wei,Weijian Nong
Lignin is the most abundant renewable aromatic resource in nature; thus, the development of an efficient and economical catalysts that can depolymerize lignin into value-added aromatic monomers is highly desirable. Here, we report a single-atom Ni catalyst ( x Ni/CeO 2 -S, where x represents the Ni loading), in which the single-atom Ni sites are anchored to the oxygen vacancies on CeO 2 nanospheres, for the conversion of cellulolytic enzyme lignin (CEL) via depolymerization and hydrodeoxygenation. The 1.0Ni/CeO 2 -S catalyst performed the best, achieving a lignin oil (LO) and maximum monomer yield of 84.3 wt% and 32.6 wt%, respectively; a higher heat value of 31.64 MJ/Kg is achieved for LO compared to 23.03 MJ/Kg for CEL. Thus, single-atom nickel catalyst exhibited excellent activity and stability in promoting the depolymerization of lignin. These results validate the viability of single-atom metal catalysts for the conversion of lignin resources.
研究领域:
催化化学
·
可再生资源利用
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Luyao Zhang,Fuli Tian,Huan Li,Jiangman Meng,Qi Liu,Xiaoqian Guo,Yun Qiu,Jun Zhang,Changyan Li
A series of non-enzymatic graphene functionalized biosensors was developed via deposition precipitation method for lactic acid (LA) detection, which were characterized by transmission electron microscopy (TEM), Raman spectroscopy , X-ray photoelectron spectroscopy (XPS), gas chromatography-mass spectrometry, liquid chromatography-mass spectrometry, and proton nuclear magnetic resonance ( 1 H NMR). The electrochemical performances of the non-enzymatic biosensors were measured by means of the electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) method. The comprehensive analysis of structures shows that Pt, CeO 2 , and GO components interact with each other. During the storing and releasing oxygen, the valence ratio of Ce 3+ /Ce 4+ and the number of oxygen vacancies in CeO 2 change accordingly, which can be conducive to increasing electronic transmission capacity and finally leads to the improvement of electrocatalytic performance. Among them, the Pt/CeO 2 /GO biosensor containing 0.47 at% platinum exhibits an excellent electrochemical detection performance with high sensitivity of 12.3 µA·L/ (mmol·cm 2 ) and a low limit of detection (LOD) of 5.12 μmol/L in a wide linear range from 10 to 900 μmol/L. In addition, the proposed biosensor possesses a promising anti-interference capability, as well as high stability and good reproducibility, which was assessed by testing the cyclic voltammogram in 0.1 mol/L lactic acid one year later. The underlying mechanism was proposed for electrochemical oxidation of LA to carbon dioxide and acetic acid with the synergistic effect among Pt, CeO 2 , and GO. Furthermore, the results of the standard addition method in real samples (human serum and urine samples) reveal that the lactic acid detection of the non-enzymatic Pt/CeO 2 /GO biosensor is accompanied by high reliability. Thus, it will be a valuable biosensor for in vitro detection of lactic acid level in clinical samples.
研究领域:
生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 11
·1735-1750
·
IF 11.534
Yang Weiyi,Wang Jian,Gao Shuang,Zhang Haoyu,Wang Hongyang,Li Qi
It is important to develop green and sustainable approaches to enhance electrochemical charge storage efficiencies. Herein, a two-step in-situ growth process was developed to fabricate carbon fiber paper-supported CeO 2 /MnO 2 composite (CeO 2 /MnO 2 —CFP) as a binder-free photo-electrode for the photo-assisted electrochemical charge storage. The formation of CeO 2 /MnO 2 type II heterojunction largely enhanced the separation efficiency of photo-generated charge carriers, resulting in a substantially enhanced photo-assisted charging capability of ∼20%. Furthermore, it retained a large part of its photo-enhanced capacitance (∼56%) in dark even after the illumination was off for 12 h, which could be attributed to its slow release of stored photo-generated electrons from its specific band structure to avoid their reaction with O 2 in dark. This study proposed the design principles for supercapacitors with both the photo-assisted charging capability and its long-lasting retainment in dark, which may be readily applied to other pseudocapacitive materials to better utilize solar energy.
研究领域:
材料科学
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能源科学
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光电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 8
·2004
·
IF 5.076
Junjiao Li,Jun Xie,Dongchen Li,Lei Yu,Chaowei Xu,Senlin Yan,Yuzheng Lu
Interface engineering can be used to tune the properties of heterostructure materials at an atomic level, yielding exceptional final physical properties. In this work, we synthesized a heterostructure of a p-type semiconductor (NiO) and an n-type semiconductor (CeO2) for solid oxide fuel cell electrolytes. The CeO2-NiO heterostructure exhibited high ionic conductivity of 0.2 S cm−1at 530 °C, which was further improved to 0.29 S cm−1by the introduction of Na+ions. When it was applied in the fuel cell, an excellent power density of 571 mW cm−1was obtained, indicating that the CeO2-NiO heterostructure can provide favorable electrolyte functionality. The prepared CeO2-NiO heterostructures possessed both proton and oxygen ionic conductivities, with oxygen ionic conductivity dominating the fuel cell reaction. Further investigations in terms of electrical conductivity and electrode polarization, a proton and oxygen ionic co-conducting mechanism, and a mechanism for blocking electron transport showed that the reconstruction of the energy band at the interfaces was responsible for the enhanced ionic conductivity and cell power output. This work presents a new methodology and scientific understanding of semiconductor-based heterostructures for advanced ceramic fuel cells.
研究领域:
材料科学
·
能源技术
·
电化学
✓ 已验证
DOI
高影响因子
Batteries-Basel
·
2024
·Vol. 10
·期 7
·235
·
IF 4.6
Tian Zhou,Jie Sun,Jigang Li,Shouping Wei,Fan Zhang,Jing Chen
In this study, a flower-like Au/CeO2supported catalyst composite anode was prepared to explore its impact on thermal runaway triggered by overcharging and flame. Through structural and performance characterization, it was found that the catalyst has a high specific surface area and good CO catalytic oxidation capability, with a CO removal rate higher than 99.97% at room temperature. Through electrical performance testing, it was discovered that, compared to batteries without the catalyst, batteries using the composite anode did not exhibit significant capacity degradation. In overcharge testing, the catalyst prolonged the voltage rise time and peak voltage occurrence time of the battery. In thermal runaway testing, the addition of the catalyst delayed the detection time of CO and significantly reduced the concentration of thermal runaway products, especially the peak concentration and integrated concentration of CO, demonstrating its effectiveness in reducing thermal runaway products. Therefore, this study provides a new approach for improving the safety of lithium-ion batteries. The catalyst exhibits good performance in reducing toxic gases generated after thermal runaway and delaying the occurrence of thermal runaway, providing strong support for the safe application of lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
电池安全
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yongyu Fan,Jie Jiao,Lang Zhao,Jinkui Tang
With the pursuit of high efficiency and quality chemical mechanical polishing (CMP), exploring additional efficiency enhancement means based on the CMP has become a trend. Polystyrene/CeO 2 core-shell abrasives (core: 85 nm, shell: 10 nm) doped with Lanthanide (La, Nd, and Eu) were synthesized by a modified in situ chemical precipitation method, promising application for photocatalytic-assisted CMP of silica wafer. The doping of La, Nd, and Eu can reduce the band gap of CeO 2 from 3.24 eV to 3.23 eV, 3.20 eV, and 3.22 eV, respectively, indicating enhanced photocatalytic activity. Especially for Nd-doped abrasives, the content of Ce 3+ increases from 0.49 to 0.56, accompanied by the generation of oxygen vacancies , as proved by X-ray photoelectron spectroscopy (XPS) and Raman spectra . In addition, the prepared polishing slurry could remain stable for up to 7 days by the steric hindrance effect and electrostatic repulsion of the dispersants . The materials removal rate of Nd-doped abrasive in photocatalytic-assisted CMP of SiO 2 films reaches 174.3 ± 7.6 nm/min, which is 163% higher than those in CMP, while the surface roughness (Ra) in localized areas (2×2 µm 2 ) can be reduced from the initial 0.82 ± 0.01 nm to 0.36 ± 0.05 nm. Detailed reaction and removal mechanism involved in photocatalytic-assisted CMP processes is discussed.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2023
·
IF 3.7
Siyue Zhou,Jingjing Fang,Kai Chao,Liang Li
Toluene, dichloromethane, and methanethiol were selected as probe molecules for aromatic, chlorinated, and sulfurated VOCs, respectively, to evaluate the catalytic properties of Pt/CeO 2 composites. The T 90 for toluene, DCM, and methanethiol oxidation were only 153, 265, and 240 °C, when 0.9 wt% Pt/CeO 2 was used as the catalyst. The synergy between Pt and support could be responsible for the high catalytic activity and antipoisoning properties. When combined with NDIR CO 2 sensors, the composite could be used for atmospheric total organic carbon detection. The recorded data almost overlap with that of the theoretical, suggesting the excellent reliability of the dictation system.
研究领域:
环境科学
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Liyu Yang,Xiangcheng Shan,Yumeng Zhao,Zuoyi Xiao,Qingda An,Shangru Zhai
Eutrophication has long been one of the environmental pollution problems, and excess phosphate in water bodies is the main cause of this phenomenon. To solve this problem, magnetic adsorbent with Fe/Ce-loaded zirconium-based metal-organic framework (Fe 3 O 4 /UiO-66-NH 2 /CeO 2 ) was prepared by co-precipitation, microwave assisted and hydrothermal method . The results showed that different molar ratios of cerium and zirconium were the main influencing factors for phosphate adsorption, and the adsorbent exerted its maximum capturing capacity of 260.8 mg/g of phosphate when Ce:Zr = 4:1. The newly synthesized Fe 3 O 4 /UiO-66-NH 2 /CeO 2 was characterized by SEM, XRD , FT-IR, XPS, VSM and TGA . The adsorption process was found to be consistent with the Langmuir adsorption isotherm model and the pseudo-second-order model by batch experiments, indicating that the monolayer chemisorption dominated the adsorption process. Thermodynamic parameters obtained from temperature experiments proved that the phosphate adsorption process is a spontaneous endothermic absorption process and the adsorption experiments with coexisting ions (F − , Cl − , NO 3 − , SO 4 2− , HCO 3 − ) showed that the adsorbent has a unique selectivity for phosphate. Unlike most adsorbents previously studied, Fe 3 O 4 /UiO-66-NH 2 /CeO 2 exhibited consistently efficient adsorption performance over the pH spectrum tested (2 < pH < 10). After five cycles, the adsorbent still maintained favourable adsorption performance. Mechanism of Fe 3 O 4 /UiO-66-NH 2 /CeO 2 adsorption on phosphate was attributed to electrostatic attraction, ligand exchange and inner-sphere complexation. Therefore, the prepared Fe 3 O 4 /UiO-66-NH 2 /CeO 2 with wide pH suitability will be a promising option for capturing phosphate from wastewater.
研究领域:
环境科学
·
水处理
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）