APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Yifei Wang,Jing Niu,Xin Gao,Yanlin Zhang
In this study, Y-doped Ag 3 PO 4 , carbon quantum dots (CQDs), BiVO 4 were used to synthesize Z-scheme Y-Ag 3 PO 4 /CQDs/BiVO 4 . X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FT-IR) and UV–vis diffuse reflectance spectra (DRS) were employed to probe into the crystalline structure, morphology, optical property and chemical composition of Y-Ag 3 PO 4 /CQDs/BiVO 4 . The kinetic constant of the prepared Y-Ag 3 PO 4 /CQDs/BiVO 4 was approximately 2.8 times that of pristine Ag 3 PO 4 for atenolol degradation. The degradation of atenolol mainly depended on the excited holes, •OH and •O 2 − . The photocatalysis mechanism of Y-Ag 3 PO 4 /CQDs/BiVO 4 conforms to the Z-scheme mechanism deduced by reactive species trapping experiment, electron spin resonance (ESR) and photoelectrochemical measurement (photocurrent response and EIS). The introduction of yttrium, CQDs and BiVO 4 significantly promoted the photogenerated carriers separation of Ag 3 PO 4 and inhibited the photogenerated electron-holes pairs recombination of Ag 3 PO 4 during the degradation of atenolol. Oxygen defects caused by the doping of Y 3+ into Ag 3 PO 4 were the centers of capture of photogenerated electrons to generate •O 2 − , inhibiting the recombination of photogenerated electron-holes pairs and the photocorrosion of Ag 3 PO 4 .
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MRS Advances
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2020
·Vol. 5
·期 31
·1661-1670
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IF 0
Xing Xianj,Li Shan,Song Yuq,Ge Yingz,Zhang Xuef,Jiang Wen,Zhang Xianwen
YBO 3 :Eu 3+ crystals with flower-like hierarchitecture are readily synthesized through a folic acid assisted hydrothermal process using polyborate precursors in the aqueous solution. It was found that the pH value, borate/yittrium ratio and the mass of folic acid take effects on the morphology and photoluminescence emission intensity of YBO 3 :Eu 3+ crystals. The product with the small flower-like hierarchitecture was obtained under the conditions of pH value at 9, borate/yittrium ratio at 2 and the mass of folic acid at 0.44 g, showing the strongest photoluminescence intensity. The growth process of the YBO 3 :Eu 3+ flowers and microflowers was invesitgated based on the time-dependent experiments, which showed that the growth mechanism of the flower-like hierarchitecture follows an in situ growth rather than self-assembly process as reported previously. Such a hydrothermal route using folic acid as a capping agent may provide a green and effective method for fabricating useful and complex 3D architectures of LEDs phosphors.
研究领域:
材料科学
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光学
✓ 已验证
DOI
THERMOCHIMICA ACTA
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2012
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IF 1.805
Xiangbo Ji,Bin Kang,Jianguo Deng,Hui Huang,Xin Wang
The thermal decomposition of amorphous neodymium-doped yttrium aluminum garnet (Nd:YAG) precursor, prepared by co-precipitation with ammonium hydration carbonate as precipitator, was studied in flowing air. Four weight loss stages were observed in the TG curve. At the first stage, NH 3 , H 2 O, NO, NO 2 and CO 2 were released owing to the evaporation of adsorbed water and ammonia water and the decomposition of residual ammonium salts below 150 °C. The structural decomposition of NH 4 + and H 2 O in the precursor molecule was decomposed at the second stage from 150 °C to 220 °C. The evolution of NO, NO 2 and CO 2 were verified in the last two stages because of the formation of metal oxides at high temperature. Moreover, YAG phase started to develop without an intermediate phase when the precursor was calcined at about 900 °C. However, the structural CO 3 2− contained in the precursor molecule was not completely eliminated at 900 °C.
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
Matter
·
2025
·
IF 17.5
Tingting Zhai,Xutao Gao,Hao Wang,Yaojia Cheng,Jingchi Gao,Jie Pan,Edmund C.M. Tse,Congxiao Shang,Zhengxiao Guo
Activity and stability are often inversely entwined in catalysis, especially for the water oxidation reaction (WOR) to generate hydrogen under acidic media. Here, we show that an ionic-mismatch-induced semi-crystalline Y 0.3 Ru 0.7 O 2 gives rise to exceptionally active and stable WOR performance. The mismatched ionic radii and valences between Y 3+ and Ru 4+ leads to a strongly bonded hybrid nanostructure of ultra-fine crystalline and amorphous domains. The short-range ordered structure also leads to a reduced adjacent distance, which facilitates a more efficient and stable dual-site coupling mechanism with an extremely low overpotential of 170 mV at 10 mA cm −2 and prolonged stability over 300 h in an acidic electrolyte. A proton-exchange-membrane (PEM) water electrolyzer loaded with the catalyst shows an outstanding performance with only 1.64 V to reach 1 A cm −2 and stable operation at 0.5 A cm −2 over 300 h, demonstrating its outstanding potential for practical applications in PEM electrolysis.
研究领域:
材料科学
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催化化学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Fengjie Chen,Ying Liang,Zejun Zhou,Ting Yu,Yunjun Mei,Zhen Zhou,Bolei Chen,Yong Liang,Yawei Wang
Strategies for the rapid and efficient removal of fluoridated industrial wastewater are currently lacking. Herein, monolayer calcium-doped layered yttrium hydroxide (Ca-Y LRH) was synthesized through formamide exfoliation, and its removal of fluoride reached equilibrium within 4 min. The adsorption kinetics fit the pseudo-second-order kinetic model with a faster adsorption rate (K F = 0.22 mg g −1 min −1 ), and the adsorption isotherm followed the Langmuir model with a maximum adsorption capacity of 483.33 mg g −1 . The interlayer chloride ions in the monolayer Ca-Y LRH were the main ligands for substituting fluoride, which inhibited the increase in pH and maintained the continuation of the fluoride removal process. Furthermore, the optimum fluoride removal performance of monolayer Ca-Y LRH was predicted by software-based multiparameter methods and was found to be useful for treating fluoridated industrial wastewater samples (858.17 or 8.72 mg L −1 ). These findings provide novel insights into the treatment of fluoridated industrial wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Pingan Tan,Xu Huang,Jingsong Liu,Lijia Cao,Fei Yang,Chong Xian,Honglan Yuan
Y 2.5- x Bi 0.5 Al x Fe 5 O 12 (YIG-Al x ) ceramics have been synthesized at 1175 ℃ by the solid-state reaction method. The effects of the co-doped Bi 3+ , Al 3+ ions on the phases, micromorphology, and dielectric and magnetic properties of the yttrium iron garnets (YIG) were investigated. Excessive introduction of Al 3+ ions led to the collapse of the YIG lattice and precipitation of the Bi 3+ and Fe 3+ ions; while moderate Al 3+ doping improved the dielectric properties , but not the saturation magnetization. The YIG-Al 0.2 ceramics proved to have particularly good electromagnetic properties ( ε r = 18.34 ± 0.05@11.19 GHz, tan δ = 3.09 ± 0.55 × 10 −4 , M s = 19.82 ± 0.55 emu/g). Additionally, tightly bonded Y 2.3 Bi 0.5 Al 0.2 Fe 5 O 12 /Ni 0.8 Zn 0.2 Fe 2 O 4 (YIG-Al 0.2 /NZF) composite substrates were prepared by co-firing at 1175 ℃. The composite substrates exhibited superior electromagnetic properties (YIG-Al 0.2 : ε r = 18.37 ± 0.05@11.15 GHz, tan δ = 3.08 ± 0.55 × 10 −4 , M s = 21.09 ± 0.55 emu/g; NZF: M s = 67.5 ± 0.55 emu/g), which were slightly affected by the diffusion of Ni and Zn from the NZF. Our findings show that YIG-Al 0.2 /NZF substrates have great potential for use as RF band circulators.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
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