Advanced Optical Materials
·
2024
·Vol. 12
·期 20
·2400184
·
IF 8
Yue Li,Haolin Lu,Rui Yun,Huanxin Yang,Yuling Liu,Zhaoyu Wang,Song Wang,Guankui Long,Xiyan Li
Lead-free perovskites exhibit unique crystal structures and optical properties due to their low-dimensional structure. However, the 0D structure of Cs 2 InCl 5 ·H 2 O usually demonstrates poor optical properties at room temperature due to their extremely strong electron–phonon coupling interaction. In this study, a doping strategy is employed by introducing Pb 2+ into Cs 2 InCl 5 ·H 2 O, resulting in the achievement of an efficient broadband blue emission, with a photoluminescence quantum yield (PLQY) of 58%. The temperature-dependent PL spectra reveal that the efficient emission is attributed to the weakening of the electron–phonon coupling strength in the lattice and the inhibition of the phonon-assisted non-radiative recombination process through Pb 2+ doping. The validity of this deduction is further corroborated by the results of the Raman spectra. The results of the first-principle calculation demonstrate that the broadband emission originates from multiple emission paths in In 3+ and Pb 2+ polyhedrons. In addition, Pb 2+ -doped Cs 2 InCl 5 ·H 2 O can realize the transformation from sky-blue emission to deep-blue emission by absorbing water in the air. Remarkably, this change is reversible during the heating–cooling cycles, demonstrating excellent optical stability with repeatable recyclability.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Linjia Li,Yiran Zhang,Jiaqi Feng,Shu Zhao,Wei Qiu,Ke Li,Zhen Huang,He Lin
Derived from carbon capture, utilization, and storage (CCUS), integrated carbon capture and utilization (ICCU) has been widely developed recently. Understanding the influences of H2O, O2, and NO2 on dual-function materials (DFMs) performance is crucial for their practical application. In this study, the influence mechanisms of O2, H2O, and NO2 on CeNiCa DFM for ICCU-methanation are investigated. The catalyst was oxidized by O2, H2O, and NO2. NO2 competes with CO2 for basic adsorption sites, inhibiting CO2 adsorption and methanation, but adsorbed NO2 is reduced mainly to N2 and NH3 during methanation. H2O induces agglomeration of the adsorbent and catalyst─the former due to the Ca(OH)2 mobility, and the latter attributed to OH-promoted migration and agglomeration of Ni. On this basis, it is proposed that the dominant roles of H2O, O2, and NO2 change in two- and multi-interference components, but the joint effects among them should not be neglected.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Hongxia Li,Lijiang Guo,Lu Luo,Zongying Zhou
The solid–liquid phase behavior of the NaF–Na3PO4–H2O ternary system and its binary subsystems NaF–H2O and Na3PO4–H2O at 308.15, 323.15, and 348.15 K has been measured by the isothermal dissolution equilibrium (IDE) method. Compared with the measured solid–liquid phase behavior data, the previously reported results have been evaluated and the unreasonability has been discussed. The phase diagrams at the investigated temperatures for this ternary system are drawn according to the measured solid–liquid phase behavior and the corresponding wet solid and liquid-wet solid–solid lines. From the phase diagrams, it is found that at a given temperature, there are three types of equilibrium solid phases, NaF(s), double salt 2Na3PO4·NaF·19H2O(s), and Na3PO4·12H2O(s) in the ternary system. Accordingly, there are two cosaturated points for NaF(s) and double salt 2Na3PO4·NaF·19H2O(s), double salt 2Na3PO4·NaF·19H2O(s) and Na3PO4·12H2O(s), respectively. The comparison of phase diagrams at different temperatures suggests that, with the rise of temperature, the double salt crystal region became a little bit larger, and correspondingly, the crystal regions of pure salt (NaF(s) and Na3PO4·12H2O(s)) became smaller, which is not beneficial to the separation of fluoride and phosphate. This indicates that the fluoride and phosphate separation process should be at lower temperatures.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Chenglin Feng,Xiaolong Liu,Tingyu Zhu,Yutao Hu,Mengkui Tian
Anatase TiO 2 loaded with 0.1wt.% Pt catalyst (0.1Pt/TiO 2 -A) was prepared via the impregnation method, and its CO catalytic oxidation activity was investigated. Noteworthy, introduction of H 2 O into the reaction atmosphere apparently facilitated the catalytic oxidation of CO. Besides, introduction of SO 2 inhibited the catalytic oxidation of CO. In presence of H 2 O and SO 2 , 0.1Pt/TiO 2 -A showed outstanding catalytic stability, and X-ray photoelectron spectroscopy (XPS) and thermogravimetric (TG) characterizations suggested that the amount of sulfate species deposited on the 0.1Pt/TiO 2 -A treated at 230 °C did not increase with time extension, which might be an important reason for the high sulfur resistance of 0.1Pt/TiO 2 -A. XPS results also demonstrated that the dissociation of H 2 O led to considerably increase of hydroxyl groups over the catalyst surface. H 2 18 O isotope-labeling experiments unambiguously showed that C 16 O 18 O was the main product accounting for 88.9%, revealing that the other oxygen atom in the product CO 2 was mostly from H 2 O. Consequently, based on previous researches and our experimental results, the mechanism of H 2 O promoting CO oxidation on 0.1Pt/TiO 2 -A catalyst was proposed.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Xin Xiao,Huan Zhong,Chunxia Zheng,Mingli Lu,Xiaoxi Zuo,Junmin Nan
Novel flower-like WO 3 ·H 2 O micro/nano-architectures are conveniently synthesized via a low-temperature oil bath route, and its catalytic oxidative desulfurization (ODS) activity for dibenzothiophene (DBT) in a model oil is systematically evaluated within an n-octane/acetonitrile (MeCN) biphasic system in the presence of H 2 O 2 as an oxidizing reagent. The results indicate that DBT can be effectively removed using the as-synthesized WO 3 ·H 2 O catalyst in the presence of H 2 O 2 and that the catalytic process follows pseudo-first-order kinetics. Under optimal conditions, i.e., n(S/catalyst) = 5 and n(H 2 O 2 /S) = 8 at 70 °C, the sulfur content is diminished from 4000 to approximately 220 μg g −1 after 60 min of reaction. The mechanistic study reveals that the desulfurization route is dominated by direct catalytic oxidation rather than indirect oxidation by radicals. The oxidation product is dibenzothiophene sulfone (DBTO 2 ) with almost 100% selectivity, and it can quickly migrate into the MeCN phase due to its highly polar nature, resulting in the removal of DBT from the oil phase. By combining the experimental results with the theoretical DFT calculations, the crystal structure of WO 3 ·H 2 O and the electronic structures of DBT vs. DBTO 2 are considered to be the key roles in this synchronized adsorption-catalytic oxidation-extraction process. In addition, the as-synthesized WO 3 ·H 2 O is structural stable during the reaction and can be also used to remove 4,6-dimethyldibenzo-thiophene (DMDBT), benzothiophene (BT), and thiophene (Th) in fuel oils, suggesting its potential for practical applications.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 22
·19931-19942
·
IF 2.22
Chen Qi-Wen,Zhou Jian-Ping,Zhu Pan-Pan
Mg 7 V 4 O 16 (OH) 2 ·H 2 O was prepared by improving the hydrothermal conditions and Mg 3 (VO 4 ) 2 was obtained by heat treatment of Mg 7 V 4 O 16 (OH) 2 ·H 2 O at 700 °C. XRD shows a phase transition from a hexagonal structure to an orthogonal structure, which is confirmed by the HRTEM results. Mg 3 (VO 4 ) 2 keeps overall pencil-shaped SEM morphology with Mg 7 V 4 O 16 (OH) 2 ·H 2 O but shows a lot of spaces due to the loss of hydroxyl groups and crystal water in the structure during heat treatment. Mg 3 (VO 4 ) 2 enjoys a narrower band gap in comparison with Mg 7 V 4 O 16 (OH) 2 ·H 2 O. The space in Mg 3 (VO 4 ) 2 microstructure and its narrower band gap improve the transmission efficiency of Li + , reaching a stabile capacity of 151 mAh/g after cycling 100 times at a current density of 100 mA/g.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2020
·Vol. 16
·期 2
·e2595
·
IF 1.06
Xiao-Yun Qi,Chun-Xia He,Shi-Hua Sang,Jia Liu,Yun-Yun Gao
The solubilities of the LiBr−NaBr−KBr−H 2 O system and its subsystems LiBr−NaBr−H 2 O and LiBr−KBr−H 2 O were investigated at 288.15 K by the isothermal dissolution equilibrium method, and the corresponding phase diagrams were plotted, respectively. In the three systems, neither solid solution nor double salt was found. For the first subsystem LiBr−NaBr−H 2 O, there are two invariant points, three dissolution equilibrium curves, and three crystallization regions, which are LiBr·2H 2 O, NaBr·2H 2 O, and NaBr. An invariant point, two dissolution equilibrium curves, and two crystallization regions, which are LiBr·2H 2 O and KBr, constitute the stable phase diagram of the second subsystem LiBr−KBr−H 2 O. The phase diagram of the quaternary system LiBr−NaBr−KBr−H 2 O consists of two invariant points, five solubility curves, and four regions in which are LiBr·2H 2 O, NaBr, NaBr·2H 2 O, and KBr.
研究领域:
化学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Rui-Zhi Cui,Wu Li,Ya-Ping Dong
The phase equilibria relationship between the quaternary system LiCl–KCl–Li2SO4–K2SO4–H2O and its subsystems LiCl–KCl–H2O and LiCl–Li2SO4–H2O was studied by the isothermal dissolution equilibrium method at 288.15 K, and the corresponding phase diagrams were drawn. At 288.15 K, ternary systems LiCl–KCl–H2O and LiCl–Li2SO4–H2O all belong to the simple type. In the phase diagram of the quaternary system LiCl–KCl–Li2SO4–K2SO4–H2O, there are five equilibrium solid phase crystallization fields: LiCl·2H2O, KCl, Li2SO4·H2O, K2SO4, and Li2SO4·K2SO4. Compared with the multitemperature phase diagrams of this system at 288.15–348.15 K, it was found that the basic configuration of the phase diagrams is the same. As the temperature increased, the phase region of double salt Li2SO4·K2SO4 clearly increased, whereas the phase region of single salt KCl and K2SO4 clearly decreased. On the basis of the experiment, the extended Harvie–Weare model of the Pitzer model was used to predict the solubility data of the quaternary system. The simulated and measured values were basically in good agreement.
研究领域:
化学热力学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiayi Qi,Xingkun Qi,Yan Pan,Junshuo Cui,Ying Xiong,Weijun Shan,Haibiao Yu
Sm 0.06 Ni with excellent H 2 O resistance for eliminating N 2 O was prepared by co-precipitation method. Research indicated that the introduction of Sm into Sm 0.06 Ni has the following effects: (1) Sm species (Sm 2 O 3 ) highly dispersed on the surface of Sm 0.06 Ni catalyst, which not only decreased the crystallite size of NiO, but also produced a certain number of edge dislocations and defects. (2) Sm 2 O 3 weakened the Ni-O band and increased the number of active sites. (3) The redox cycle of Ni 2+ + Sm 3+ ↔ Ni 3+ + Sm 2+ was formed on the surface of Sm 0.06 Ni during the reaction. Based on the above changes, Sm 0.06 Ni exhibited superior catalytic performance and much lower E a for the reaction compared with pure NiO. Over Sm 0.06 Ni, the TOF at 350 ℃ was 4.1 × 10 −3 s −1 , 37 times of that over pure NiO. More importantly, Sm 0.06 Ni exhibited excellent H 2 O resistance performance under submitted real reaction conditions, about 76 % N 2 O conversion can be obtained at 400 ℃.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Lan Yang,Dan Li,Yupeng Li,Lingzong Meng,Tianlong Deng,Yafei Guo
The solid-liquid phase equilibria in the systems NaCl–SrCl 2 –H 2 O and NaCl–CaCl 2 –SrCl 2 –H 2 O at 323.15 K were studied with the isothermal dissolution method. The solid-liquid equilibrium phase diagrams were constructed with the experimental results. A comparison of the diagrams of system NaCl–SrCl 2 –H 2 O from 288.15 to 373.15 K shows that area of strontium chloride salt region decreased obviously whereas the areas of NaCl almost invariant. The dry-salt diagram of the NaCl–CaCl 2 –SrCl 2 –H 2 O system consists of four single-salt crystallization regions for NaCl, SrCl 2 ·6H 2 O, SrCl 2 ·2H 2 O and CaCl 2 ·2H 2 O, five univariant solubility curves and two invariant points. Combining Pitzer binary parameters obtained in the literatures, the Pitzer mixing parameters θ Na,Ca , θ Na,Sr , θ Ca,Sr , Ψ Na,Ca,Cl , Ψ Na,Sr,Cl and Ψ Ca,Sr,Cl were fitted with the solubility data in this study and literatures. The model was then used for predicting the solubilities of the two systems. The experimental data are in accordance with the predicted results.
研究领域:
化学
·
物理化学
✓ 已验证
DOI
高影响因子
International Journal of Refrigeration
·
2021
·
IF 3.629
Zhenghao Jin,Shuhong Li,Runfa Zhou,Mengkai Xu,Weixue Jiang,Kai Du
The newly NH 3 – H 2 O – LiBr working fluid can decrease the power wasted in the generator, thus improves the COP of the ammonia absorption refrigeration system. But the applying of NH 3 – H 2 O – LiBr working fluid decreases the ammonia absorption efficiency, so the COP of the system is still unsatisfactory. To further enhance the COP of the NH 3 – H 2 O - LiBr absorption refrigeration system, TiO 2 nanoparticles are added to the NH 3 – H 2 O - LiBr working fluid in this study. And the effects of TiO 2 nanoparticles concentration on the performances of the generator, absorber, evaporator, condenser, and solution heat exchanger are tested in an ARS experimental system. The experimental results indicate that the addition of TiO 2 nanoparticles increases the P g , P e , P a , and P c , meaning that the value of ammonia produced in the generator increases. Therefore, the COP and iCOP of the system are improved by adding TiO 2 nanoparticles, and the COP is maximum improved by 18.96% compared with the ammonia-water absorption refrigeration system. When the x TiO2 is increased from 0.3% to 0.5%, the increase rate of the COP decreases because the newly added nanoparticles do not disperse well. So 0.3% is a better choice for the TiO 2 nanoparticles concentration when comprehensively considering the dispersion stability of nanoparticles and the COP.
研究领域:
工程热物理
·
制冷技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Hongxia Li,Lijiang Guo
The solubility and phase diagram of the CsCl–MgCl2–H2O ternary system, at a relatively wide temperature range, are significantly important for the extraction of the cesium resources from salt lakes. The isothermal dissolve equilibrium (IDE) method was used to determine the solubility of this ternary system at T = 273.15, 308.15, and 348.15 K, which have not been reported yet. The measured results indicated that the equilibrium solid phases in this ternary system from T = 273.15 to 348.15 K are CsCl, double salt CsCl·MgCl2·6H2O, and MgCl2·6H2O, and correspondingly there are three crystal regions and two cosaturated points for these solid phases. The solubility of the salt increased with the increase of the temperature, and the double salt CsCl·MgCl2·6H2O and CsCl crystal regions also became larger with the increasing temperature. However, the crystal regions of the MgCl2·6H2O solid phase are not enlarged obviously. Based on the solubility and phase diagram of CsCl–MgCl2–H2O at different temperatures, the separation process of CsCl resources has been proposed.
研究领域:
化学
·
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）