NEW JOURNAL OF CHEMISTRY
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2024
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IF 2.7
Zhongming Hao,Xinghong Duo
Enhancing photocatalytic performance relies on efficient and stable solar energy utilization, broadening visible light absorption, and optimizing interfacial charge transfer mechanisms. We successfully synthesized lead-cerium co-doped TiO2 enriched with oxygen vacancies (Tiδ+-Ov(-Ceδ+)-Pb2+) using sol-gel and direct addition methods. Results show that Pb2+ ions are uniformly distributed within the oxygen vacancy-rich TiO2 lattice, synergizing with surface-embedded Ce2+/Ce3+ ions to extend the visible light absorption range of TiO2. This led to a 32.3% increase in light absorption and an approximate 90% improvement in photoelectric conversion efficiency. The maximum photocurrent density reached 3.1 μA/cm², with a reduction of 0.15 eV in the initial oxidation potential and a 30% decrease in bandgap width. Under simulated sunlight (AM1.5G), the hydrogen production rate of Tiδ+-Ov(-Ceδ+)-Pb2+ was 11.516 μmol/h/g, double the combined output of TiO2-Ce and TiO2-Pb. Mechanistic analysis reveals that the superior performance stems from the interfacial sites in Tiδ+-Ov(-Ceδ+)-Pb2+, where the low-valent Pb2+ and variable-valent Ce3+/Ce4+ ions act as charge traps that promote efficient charge separation. Furthermore, surface-embedded Ce generates an uneven surface potential, facilitating the adsorption of formaldehyde molecules from the solution onto the modified TiO2 surface and improving carrier dynamics. These findings provide new strategies for designing and optimizing high-efficiency photocatalytic materials.
研究领域:
材料科学
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能源科学
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化学工程
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产品关联
DOI
高影响因子
Optical Materials Express
·
2024
·Vol. 14
·期 6
·1531-1546
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IF 2.8
Zhenghao Li,Zhenghao Li,Xin Li,Yan Sun,Yan Sun,Chongyun Shao,Wei Chen,Wei Chen,Xin Wang,Chunlei Yu,Lili Hu,Malgorzata Guzik,Georges Boulon
To develop Dy doped silica glass with a higher irradiation resistance, which can be adapted to high power violet or blue LD pumped yellow laser fibers, the designed Dy-Al-Ce codoped silica glasses, 0.05Dy2O3-1.5Al2O3-xCe2O3-(98.45-x)SiO2 (x = 0, 0.05, 0.1, 0.25, 0.5), were prepared by the sol-gel method. Their excitation spectra, emission spectra and emission decay curves associated with the yellow emission from 4F9/2 to 6H13/2 of Dy were determined before and after the X-ray irradiation of 1000 Gy. The relation between these spectra and Ce-codoping concentrations is discussed, including the sensitization from Ce to Dy, the reverse energy transfer from Dy to Ce, and especially the X-ray-induced photodarkening, which is detrimental to the 576 nm yellow emission of Dy. The centers that cause the photodarkening are analyzed by electron paramagnetic resonance and radiation induced absorption spectra. It is found that Ce can effectively suppress the Al-oxygen hole center induced by the X-ray across the entire concentration range of Ce-codoping, but a new photodarkening center is generated at higher concentrations of Ce-codoping. Finally, the optimized Ce-codoping concentration of ∼0.1 mol% is used to achieve a promising yellow laser glass of Dy-Al-Ce codoped silica with enhanced irradiation resistance, resulting in its X-ray-induced photodarkening that is only 6% - 14% of that in the Ce-undoped.
研究领域:
光学材料
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激光物理
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辐射效应
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2014
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IF 2.086
Pinghua Chen,Xuezhen Zhou,Weifan Chen,Dongping Li,Yongxiu Li
The aim of the current work was to prepare partially stabilized yttria and ceria co-doped zirconia nanocrystals (PS-YCZ-NCs) with a controlled phase state and morphology. PS-YCZ-NCs were prepared via the sol–gel method based on the direct reaction of metal nitrates with ethylene glycol in the presence of sodium chloride. The effect of the NaCl dosage on the particle morphology and phase state was investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The addition of NaCl in the sol–gel process was determined to improve the formation of tetragonal zirconia at calcination temperatures of less than 600 °C and to induce a phase transformation from tetragonal to monoclinic at temperatures above 600 °C. Therefore, PS-YCZ-NCs with different tetragonal and monoclinic phase ratios can be prepared by changing the dosage of NaCl and the calcination temperature. In addition, the optimal synthesis conditions for PS-YCZ-NCs with pseudo-sphere morphology and a particle size ranging from 15 to 30 nm have been determined.
研究领域:
材料科学
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 10
·1-13
·
IF 5.3
Meng Dongling,Chen Zhiyan,Chen Zhibin,Cen Junrao,Li Jitao,Yang Yaling
Iron-cerium co-doped carbon dots (Fe,Ce-CDs) were synthesized by one-step hydrothermal method using tartaric acid and L-tryptophan as ligands. Fe,Ce-CDs shows excellent peroxidase-like (POD) activity and nitrite (NO 2 − ) can promote the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to its blue oxidation product (oxTMB) due to the formation of ∙NO 2 free radical. NO 2 − further react with oxTMB to form a yellow color via diazotization resulting in the absorbance Change at 450 nm. By Fe,Ce-CDs + NO 2 − + TMB + H 2 O 2 and oxTMB + NO 2 − systems, a dual-signal colorimetric nanosensor for NO 2 − detection is developed with lower detection limits (LODs) of 0.272 μg/L and 0.019 mg/L, respectively. The proposed methods were applied to the detection of NO 2 − in tobacco samples with good recovery from 91.20 to 110.61%, achieving similar results and indicating their high accuracy and feasibility. Graphical
研究领域:
分析化学
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纳米材料
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环境与食品安全
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传感器与生物传感器
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产品关联
DOI
PubMed
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Yuanyao Dou,Yimin Zhang,Caiyu Lin,Rui Han,Yubo Wang,Di Wu,Jie Zheng,Conghua Lu,Liling Tang,Yong He
Multiple component integration to achieve both therapy and diagnosis in a single theranostic nanosystem has aroused great research interest in the medical investigator. This study aimed to construct a novel theranostic nanoplatform ferrite and ceria co-engineered mesoporous silica nanoparticles (Fe/Ce-MSN) antioxidant agent though a facile metal Fe/Ce-codoping approach in the MSN framework. The resulted Fe 3+ -incorporated ceria-based MSN nanoparticles possessing a higher Ce 3+ -to-Ce 4+ ratio than those revealed by ceria-only nanoparticles. The as-prepared Fe/Ce-MSN nanoparticles exhibited an excellent efficiency in scavenging reactive oxygen species (ROS), which is attributed to improving the superoxide dismutase (SOD) mimetics activity by increasing Ce 3+ content and maintaining a higher activity of catalase (CAT) mimetics via including ferrite ion in nanoparticles. The fast Fe/Ce-MSN biodegradation, which is sensitive to the mild acidic microenvironment of inflammation, can accelerate Fe/Ce ion release, and the freed Fe ions enhanced T 2 -weighted magnetic resonance imaging in the inflammation site. PEGylated Fe/Ce-MSN nanoparticles in vitro cell models significantly attenuated ROS-induced inflammation, oxidative stress, and apoptosis in macrophages by scavenging overproduced intracellular ROS. More importantly, Fe/Ce-MSN-PEG NPs exhibited significant anti-inflammatory effects by inhibiting lipopolysaccharide (LPS)-induced expression of tumor necrosis factor-α (TNF-α) and interleukin-1 beta (IL-1β) levels in vitro . Additionally, it can promote the macrophages polarization of pro-inflammatory M1 phenotype towards an anti-inflammatory M2 phenotype. Thus, the novel pH-responsive theranostic nanoplatform shows great promise for inflammation and oxidative stress-associated disease treatment.
研究领域:
纳米技术
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材料科学
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生物医学工程
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药学
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炎症研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）