OPTICAL MATERIALS
·
2022
·
IF 3.754
Cheng Zuo,Xishi Tai,Qian Su
S-scheme heterojunction can accelerate the separation of photogenerated electron-hole pairs and retain strong redox ability, so it has outstanding advantages and application prospects in the field of photocatalysis . The Ce 3+ self-doping CeO 2-x @CuO nanowires arrays on copper mesh were synthesized with the strategy of surface hydrogenation and hydrothermal calcination method. The morphology, composition and properties of the catalysts were determined by SEM, TEM, EDS , UV-VIS, PL , CO 2 -TPD and other characterization methods. Ce 3+ self-doping introduces O vacancies on the surface of CeO 2 without introducing heteroatoms. The O vacancies of CeO 2-x could enhance the adsorption, activation and reduction of CO 2 . The existence of coaxial S-scheme heterojunctions could effectively enhance the light absorption range and the separation of photo-generated charges. The photocatalytic activity of the composite catalyst was much higher than that of pure CuO/copper mesh (CM) and CeO 2 , and the difference in activity of catalysts composed of different proportions was studied. When the Ce 3+ self-doping CeO 2-x loading was moderate, the methanol yield reached 6.73 μmol·g cat −1 after 4 h reaction under visible light , which is 5.26 times of CuO/CM and 9.35 times of CeO 2 . The reduction mechanism of the composite catalyst at the gas-liquid interface was studied. This work demonstrates a feasible strategy to create efficient S-scheme heterojunction photocatalysts with rich active surface O vacancies for photocatalytic CO 2 reduction.
研究领域:
材料科学
·
环境科学
·
光催化领域
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2024
·Vol. 14
·期 8
·945
·
IF 2.9
Xinye Lu,Haixia Wu,Jisheng Xu,Jianni Chen,Yaqian Huang,Hongliang Li,Jie Song,Rui Huang
Zero-dimensional tin-based halide perovskites have garnered considerable interest owing to their remarkable optical properties, including broad-band emission, high photoluminescence (PL) efficiency, and low self-absorption. Nevertheless, enhancing the PL efficiency and stability of these materials remains a pressing challenge. In this study, the enhancement of PL and stability in Cs4SnBr6zero-dimensional perovskite was investigated through Ce3+doping. Our experimental results demonstrate that the incorporation of Ce3+can significantly boost the light emission intensity from self-trapped excitons (STEs) in Cs4SnBr6, achieving over a 150% increase compared to the undoped sample, with a PL quantum yield of approximately 64.7%. Moreover, the thermal stability of the corresponding doped sample is markedly enhanced. Through comprehensive analyses, including X-ray diffraction, energy-dispersive spectroscopy, time-resolved PL, and temperature-dependent PL measurements, we elucidate that the enhanced light emission is attributed to the distortion of the [SnBr6]4−octahedral structure induced by Ce3+doping, which strengthens electron–phonon coupling and elevates the binding energy of STEs.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Weiyi Lu,Shuyan Lou,Bin Yang,Meixuan Wu,Huimin Hao,Zihua Guo
The convenient monitoring of carbaryl is necessary because of its serious threat to environment and public health. In enzyme inhibition-based colorimetric detection, the oxidation of colorimetric substrate (3,3′,5,5′-tetramethyl benzidine) only proceeds at pH below 5, while most enzymes only work efficiently at neutral pH. Here fluorescein was doped in coordination polymers to serve as novel nanozymes for efficient light-activated oxidation. The long triplet state lifetime of Ce 3+ made the substrate oxidize at neutral pH to overcome a pH limitation. Furthermore, one interesting light-activated biosensing system was developed based on the carbaryl’s unique toxicity towards acetylcholinesterase. It can sensitively detect carbaryl at neutral pH with a limit of detection 1.53 μg/L, which is much lower than the maximum residue limit (50 μg/L) in European Union database. It also enjoys a good selectivity for carbaryl detection over other pesticides or endocrine disruptors . Besides, the biosensing system showed a satisfied performance to detect carbaryl in both water and food samples.
研究领域:
分析化学
·
环境科学
·
材料科学
·
生物传感器
✓ 已验证
产品关联
DOI
高影响因子
AIP Advances
·
2022
·Vol. 12
·期 5
·
IF 1.697
Tu Huan,Zhao Guoying,Hou Jingshan,Liu Yufeng,Zhou Yan,Zhang Ganghua,Sun Hong-Tao,Li Ji-Guang,Fang Yongzheng
White light emitting diodes (LEDs) suffer from two most common drawbacks: the deficiency of the red component and the poor thermal stability of silicone. Ce 3+ -doped garnet phosphors with tailor-made luminescence properties can be achieved by variations in {A}, {B}, and {C} cation sites. Herein, a simultaneous ion co-substitution design strategy has been adopted to synthesize a series of (Y, Ca) 3 (Al, Mg) 2 (Al, Si) 3 O 12 garnet phosphors and corresponding phosphor-in-glass (PiG) films. The co-substitution is finely restricted to the assigned sites. The emission peak is shifted from 529 to 565 nm, which is beneficial to obtain low color temperatures and high color rendering using a single phosphor for white LEDs. By employing the as-synthesized phosphor, the corresponding PiG films were fabricated by the low temperature co-sintering technology using the SiO 2 –B 2 O 3 –ZnO–Na 2 O glass system characterized with excellent thermal stability and moisture resistance. The morphological and elemental analyses demonstrated that the as-made phosphor powders were uniformly distributed in the glass host without any interfacial reactions. Finally, modular white LEDs with a high color rendering (Ra = 82.7) is achieved through the as-synthesized PiG film on an InGaN blue chip. This study may open up a facile approach to obtain high quality luminescence based on the mono-luminescence center, avoiding excitation energy wastage and low quantum efficiency aroused by multi-luminescence centers or color compensation phosphors in glass.
研究领域:
材料科学
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光电子学
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固态照明
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无机化学
·
应用物理学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Ke Sun,Haibin Lin,Rui Zhang,Jinlong Zhu,Liping Wang,Songbai Han,Xiaofei Wang
The emerging laser-driven phosphor-converted white laser diodes (w-LDs) demand highly efficient and thermally stable color converters. To this end, the Ce 3+ luminescence in the rekindled La–Si–O–N host, and the impacts of NH 4 Cl flux and post-processing are investigated systematically. On the basis of the XRD results, well crystalline Ce 3+ -doped La 5 Si 3 O 12 N and LaSiO 2 N are obtained at 1600 °C for 5 h and 1500 °C for 4 h, respectively. Impressively, the representative La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ exhibit a broad excitation band from 240 nm to 400 nm, peaking at around 360 nm, which is well matched with emission from near-UV (n-UV) chip. Under excitation by a n-UV laser, the La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ produce bright blue light in a wide emission band from 360 nm to 550 nm. The CIE chromaticity diagram reveals the tunability of the hue of these phosphors. The quenching temperature is determined to be 396 K and 429 K for La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ respectively, indicating superior thermal stability. The addition of 3 wt% NH 4 Cl flux much enhances the emission intensity of both La 5 Si 3 O 12 N:0.04Ce 3+ and LaSiO 2 N:0.03Ce 3+ . Furthermore, the post-treatments markedly improve the luminescence properties by increasing the crystallinity , reducing the surface defect , and changing the morphology. Therefore, it is believed that the present work has promising applications in LD lighting and promoting the development of laser display.
研究领域:
材料科学
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光学
·
光子学
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激光技术
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照明工程
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2016
·
IF 0
D.C. Huang,You Fu Zhou,Chao Quan,Wen Tao Xu
New luminescent oxynitridosilicates doped with Eu2+ and Ce3+ have been synthesized by solid state reaction method at 1450oC. The host has the general formula La1-ySr1-xSiO3N: (yCe3+, xEu2+), which presents greenish-yellow or orange photoluminescence under UV/blue excitation. Remarkable long wavelength emissions centered above 565 nm were observed for the Ce3+ activated oxynitridosilicates, with compositions LaSrSiO3N:0.02Ce3+, and LaSrSiO3N:(0.02Ce3+, 0.02Eu2+) for 598 nm due to a significant amount of energy transfer from Ce3+ ions to Eu2+ ions. By combining the title LaSrSiO3N:(Ce3+, Eu2+) phosphors with the 450 nm InGaN chip, a broad range of white light with correlated color temperatures of ~3500 K and color-rendering index of 92 can be generated, demonstrating their promising practical applicability to the warm-white light-emitting diodes.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
JOM
·
2023
·Vol. 75
·期 9
·3353-3364
·
IF 2.6
Jia Wenhu,Cao Huaijie,Zeng Yanwei,Chen Xiaohang,Xu Qunjie
Anticorrosive coatings for corrosion protection on aluminum alloy remain challenges in high protection efficiency and stability with facile design. Here, a stable superhydrophobic film is successfully prepared on 5052 aluminum alloy (AA5052) by electrodeposition to enhance its corrosion resistance in 3.5 wt% NaCl solution. The contact angle reaches 157° at the electrodeposition voltage of 10 V. Electrochemical tests confirm that it can serve as a highly effective and stable coating for corrosion protection with an inhibition efficiency ( η ) of 99.1%. The charge transfer resistance of the coated Al alloy increases remarkably from 8.955 kΩ cm 2 to 366.1 kΩ cm 2 . Besides, the superhydrophobic surface shows good stability when it is exposed to air and NaCl solution for a long time. After immersion for 12 days in 3.5 wt% NaCl solution, the superhydrophobic coating still exhibits a low corrosion current density of 3.309 × 10 -7 A/cm 2 . The synergy effects of the superhydrophobicity and the Ce 3+ endow the coating with remarkably enhancing corrosion resistance. This facile strategy can provide new ideas for designing highly effective and stable anti-corrosion coatings on aluminum alloy.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Liang Dong,Sihan Yang,Jian He,Qi Zhu,Ji-Guang Li,Xuejiao Wang
This work studied the Pr 3+ single doped KSrScSi 2 O 7 : x Pr 3+ ( x = 0–10 at%) and Ce 3+ -Pr 3+ codoped KSrScSi 2 O 7 : Ce 3+ , y Pr 3+ ( y = 0.5–7 at%) phosphors, including photoluminescence characteristics, crystal structure, and the mechanism of Ce 3+ → Pr 3+ energy transfer. All the samples were synthesized by the high-temperature solid-phase method. Under 448 nm light excitation, the KSrScSi 2 O 7 : x Pr 3+ ( x = 0.5–10 at%) phosphors emitted narrow-band cyan-blue light (490 nm, 3 P 0 → 3 H 4 ), green light (530 nm, 3 P 1 → 3 H 5 ), orange-red light (605 nm, 1 D 2 → 3 H 4 and 3 P 0 → 3 H 6 ), and red light (645 nm, 3 P 0 → 3 F 2 ). The KSrScSi 2 O 7 : 3 at%Ce 3+ , y Pr 3+ ( y = 1–7 at%) phosphors exhibited broad-band (380–550 nm) luminescence of Ce 3+ and narrow-band luminescence of Pr 3+ under 365 nm light excitation. In comparison with KSrScSi 2 O 7 : 3 at% Ce 3+ , the doping of 3 at% Pr 3+ beneficially enhanced the thermal stability of the phosphor (I 423 K /I 298 K from 37.4 % to 48.6 %), which was attributed to the introduction of electron trap by Pr 3+ . Through trapping energy levels compensation, the thermal stability of the phosphor was improved. By measuring the fluorescence decay kinetics of Ce 3+ in KSrScSi 2 O 7 : 3 at% Ce 3+ , y Pr 3+ ( y = 0–7 at%), we have proved the existence of Ce 3+ → Pr 3+ energy transfer, whose efficiency rises from 42.8 % to 67.2 % along with increasing Pr 3+ concentration. A pc-WLED was fabricated by combining KSrScSi 2 O 7 : 3 at% Ce 3+ , 3 at% Pr 3+ with commercial red and green phosphors, and the device showed a high color rendering index (CRI = 94.8) and superior color rendering stability.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Yinghui Sun,Guojie Zhang,Haizhu Cheng,Jun Liu,Guoqiang Li
The mechanism and kinetic features of dry reforming with methane (DRM) over Ca promoted 1Co–1Ce/AC-N catalyst was investigated. The mechanistic pathway studies have conducted by FTIR and XPS analysis, structure-activity correlations demonstrated the CH 4 and CO 2 could adsorb on catalyst active sites and generate intermediate CH x , OH and CH x O, continue to generate CO and H 2 and then desorbed from active sites. Moreover, CH 4 could also oxidized by Ce 4+ and CO 2 reduced by Ce 3+ , the same content of Ce 4+ and Ce 3+ on promoted catalyst greatly improved the reaction rate. The kinetic of dry reforming with methane was examined for temperature between 650 and 850 at 800 °C. The research was carried out by changing the CH 4 /CO 2 ratios between 0.3 and 3.0. The obtained experiment data were fitted by three typical kinetic models (Power Law, Eley-Rideal and Langmuir-Hinshelwood), the fitting results demonstrated that the best prediction of reforming rates can provided by Langmuir-Hinshelwood model for the reaction temperatures between 650 and 800 °C. Moreover, activation energies of methane and carbon dioxide consumption were −117 and −47 kJ/mol, indicating that much higher energy barrier is needed for methane activation compared to carbon dioxide.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2012
·
IF 1.751
Lin Gan,Zhi-Yong Mao,Yu-Qiang Zhang,Fang-Fang Xu,Ying-Chun Zhu,Xue-Jian Liu
Ce 3+ -doped β-SiAlON blue phosphors with composition of Ce x Si 6− z Al z O z N 8− z (0.2≤ z ≤4) at a fixed x =0.01 were synthesized by the gas pressure sintering method. The phases and photoluminescence properties were found to be directly correlated to the z value. Higher z value would result in the formation of AlN polytypoid impurity phases. The optimal z value resides in the range 0.3≤ z ≤0.5, by which high purity of β-SiAlON phase, good crystallinity and fine grain size were obtained, leading to the best luminescence properties. These phosphors could be a good candidate for application in white light-emitting diodes using InGaN-based near–ultraviolet chips.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2020
·
IF 3.871
Xianhua Zhang,Yinghui Su,Chunlei Pei,Zhi-Jian Zhao,Rui Liu,Jinlong Gong
Chemical looping steam reforming of methane (CL-SRM) has emerged as an attractive pathway on H 2 O splitting for H 2 production. However, this process still faces a major challenge in efficiently producing H 2 with high redox kinetics and yields. In this paper, the promoting effects of Ce 3+ substitution into LaFeO 3 redox catalysts on thermochemical H 2 O splitting as well as partial oxidation of methane are presented. An appropriate amount of Ce 3+ substitution in A site of LaFeO 3 (La 0.5 Ce 0.5 FeO 3 ) promotes the lattice oxygen conversion rate in methane partial oxidation step and boosts the reaction kinetics in H 2 O splitting step by enhancing the surface water activation and lattice oxygen mobility of the perovskite. In the CL-SRM process, the perovskite is reduced into Fe 0 /(La 0.5 Ce 0.5 ) 2 O 3 and Fe 0 /(La 0.5 Ce 0.5 )O 2- x phases in methane partial oxidation step and recovered to the original perovskite structure in H 2 O splitting step with simultaneous production of hydrogen, which maintains a reversible phase transformation during 100 redox cycles. As a result, the La 0.5 Ce 0.5 FeO 3 achieves high stability with the superior performance for syngas and hydrogen production. These findings provide the fundamental understanding on the synergy between the catalytic sites and enhanced lattice oxygen mobility for the promotion of H 2 O activation and hydrogen productivity in chemical looping process.
研究领域:
化学工程
·
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 23
·235704
·
IF 3.5
Yanxing Wang,Wenjing Li,Yaqun Ma,Bo Hu,Xueli Chen,Ruichan Lv
In this research, a thermally activated upconversion luminescence (UCL) probe with ratiometric temperature sensing under 1064 nm and 808 nm excitation was designed. Especially, Nd3+, Tm3+ and Ce3+ were doped in rare earth nanoparticles (RENPs) as UCL modulators. By optimizing the elements and ratios, the excitation wavelength is successfully modulated to 1064 nm excitation with UCL intensity enhanced. Additionally, the prepared RENPs have a significant temperature response at 1064 nm excitation and can be used for thermochromic coatings. The intensity ratio of three-photon UCL (1064 nm excitation) to two-photon UCL (808 nm excitation) as an exponential function of temperature can be used as a ratiometric temperature detector. Therefore, this designed thermochromic coatings may enable new applications in optoelectronic device and industrial sensor.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）