CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 17
·30093-30099
·
IF 5.1
Chenwei Xiong,Rui Hao,Huashan Li,Shaopeng Lin,Decai Ma
X-ray excited radioluminescence was demonstrated in Pr-doped lithium niobate polycrystalline samples with varying lithium-to-niobium ratios (R LN ). The samples' phase structures, excitation and emission spectra , and radioluminescence were experimentally analyzed to investigate the tuning effects of R LN . Theoretical calculations based on Density Functional Theory (DFT) were conducted to elucidate the underlying mechanisms, and thermoluminescence curves were measured to verify the predictions of the theoretical analysis. We suggest that both photoluminescence and radioluminescence properties can be effectively tailored by adjusting the crystal structure, as well as the depth and density of electron traps within the LiNbO 3 :Pr matrix through R LN modulation. This research contributes to the development and practical implementation of scintillation materials derived from rare-earth-doped lithium niobate .
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xin Wang,Yunfei Gao,Zhiyang Cai,Shan Hu,Junxian Zhang,Fuchen Wang,Yifei Wang
Chemical looping air separation (CLAS) represents a promising approach to use thermal energy for high-purity oxygen production. CeO 2 represents a class of material that uncouples oxygen using thermal energy, but the required temperature is usually very high (>1400 °C). This limits the potential use for CeO 2 -based materials in CLAS. This study reports a Pr doped CeO 2 oxygen sorbents for chemical looping air separation at ultra-low temperatures. The as-formed Ce 1-x Pr x O 2 solid solution can uncouple oxygen effectively, achieving a redox oxygen capacity of 0.88 wt% at isothermal condition as low as 500 °C. The redox oxygen capacity can be further enhanced to 1.63 wt% in temperature-swing cycles between 400 °C and 900 °C. Moreover, oxygen partial pressure-swing cycles show that the Ce 1-x Pr x O 2 solid solution maintains 95% of its redox oxygen capacity at oxygen partial pressure as low as 0.02 atm, indicating its potential applications in oxygen separation from diluted air. DFT calculations and other physio-chemical characterizations indicate that Pr doping can effectively reduce the oxygen vacancy formation energy, and gaseous oxygen is uncoupled when Pr 4+ and Ce 4+ are reduced in the Ce 1-x Pr x O 2 solid solution. Overall, this study highlights the novel performance of CeO 2 with Pr doping and could offer insights into CeO 2 modification strategies for thermal chemical applications.
研究领域:
材料科学
·
化学工程
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zi-Hao Chen,Qiang Tang,Jian-An Zeng,Haijiao Xie,Rui Zou,Jing Wang,Bo-Mei Liu
X-rays hold broad application prospects across diverse domains. However, improper utilization poses a security risk to human safety. Recently, radiochromic materials have emerged as promising candidates for the detection and imaging of X-ray radiation. Herein, a novel material, La 2 MgZrO 6 :Pr 3+ , was developed that exhibits reversible photochromic induced by X-ray irradiation. When the material is irradiated with an X-ray, the color of the material changes from white to brown ( ΔR ≈ 32 %), and this color can be rapidly reversed when illuminated with a 450 nm blue lamp. Meantime, the radiation dose (0–120 Gy) can be initially determined according to the color depth of the material, and the dose can be accurately measured by thermoluminescence. Furthermore, a lab-made X-ray imaging system is designed, which can be used for both bright field and dark field dual-mode X-ray imaging with considerable resolution (∼4.5 lp mm −1 ). These findings could revolutionize the next generation of X-ray detection materials and devices, and drive progress in this field.
研究领域:
材料科学
·
医学影像
·
辐射检测
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高影响因子
JOURNAL OF CLUSTER SCIENCE
·
2019
·Vol. 31
·期 2
·513-522
·
IF 2.125
Liu Qiang,Liu Yuqi,Zhang Qingqing,Wang Xinying,Li Wei
A new Pr(III)-based metal organic framework with formula {[Pr 2 (C 8 H 3 O 6 N)(SO 4 ) 2 ]·5H 2 O} n was hydrothermally synthesized and characterized by techniques of single crystal X-ray diffraction, infrared spectra (IR), thermogravimetric analysis (TGA), elemental analysis, powder X-ray diffraction (PXRD), and luminescent measurements. X-ray crystal structure analyses reveal that complex 1 is binuclear structure and all Pr(III) atoms show a coordination number of nine with a tricapped trigonal prismatic coordination geometry. Throughout the molecular structure, this lanthanide metal–organic frameworks exhibits a 3D architecture built by the 1D double-stranded chains of Pr ions linked by the 5-nitroisophthalic acid ligand and 2D Pr–SO 4 2− grid. In addition, the fluorescence, nitrogen adsorption properties and carbon dioxide adsorption properties of complex 1 were also investigated. The results indicate that the complex is not only a luminescent and mesoporous material, but also a potential material for selective absorption of carbon dioxide.
研究领域:
材料科学
·
化学
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JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 6
·2258-2272
·
IF 3.5
Luo Hanqiong,Hu Quanli,Yue Bin,Du Suxuan
Rare earth orthocobaltates nanofibers (PrCoO 3 , EuCoO 3 , and GdCoO 3 ) were prepared by a simple electrospinning method coupled with calcination. The PrCoO 3 , EuCoO 3 , and GdCoO 3 nanofibers have orthorhombic perovskite structure. The fabricated electrodes presented the typical pseudocapacitive characteristics, which originated from the reversible redox reactions of Co 2+ /Co 3+ and Fe(CN) 6 3− /Fe(CN) 6 4− . At 1 A g −1 , the specific capacitances of the PrCoO 3 , EuCoO 3 , and GdCoO 3 nanofibers were 119, 133, and 196 F g −1 , respectively. The electrochemical characteristics of the PrCoO 3 , EuCoO 3 , and GdCoO 3 nanofibers exhibited favorable specific capacitance, good long-term cycling stability, and high coulombic efficiency, proving the possible application into energy storage devices. PrCoO 3 and EuCoO 3 nanofibers exhibited a magnetic state transition from paramagnetic to antiferromagnetic state. GdCoO 3 nanofibers showed a paramagnetic ordering at high temperature. The cooperation of the R 3+ ions and the Co 2+ ions contributed to the magnetism of rare earth orthocobaltates nanofibers. The antiferromagnetic behaviors of the fabricated samples confirm the potential application into spin-electronic devices.
研究领域:
材料科学
·
电化学
·
纳米技术
·
固态物理
·
能量存储
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Liqing Li,Sisi Chen,Ruiying Zhai,Yijie Yang,Peilin Lei,Jiahao Lu,Xiaoqi Sun
In this article, the novel environment-friendly brown near-infrared reflective pigments, Bi 7.38-x Pr x Zr 0.62 O 12.31+δ (x = 0-0.2), were synthesized via a high-temperature solid-phase reaction at 800 °C for 2 h. X-ray diffractometer, field emission scanning electron microscopy, UV–Vis–NIR spectroscopy, L* a* b* color space system and a UV aging test chamber were used to characterize the phase structure, micromorphology, optical characteristics, color properties, and UV aging resistance of the synthesized pigments. The results reveal that doping Bi 7.38 Zr 0.62 O 12.31 with Pr 6 O 11 caused a color transition from orange to brown. At a Pr doping level of 0.05, the brown pigment demonstrated a near-infrared reflectance of 96.54% and a near-infrared solar reflectance of 84.51%. Acid-base tolerance and UV aging tests showed that the color difference (ΔE*) between the pigments before and after treatment was less than 5, confirming its excellent stability. In the study of coating performance, air temperature inside the model coated with Bi 7.33 Pr 0.05 Zr 0.62 O 12.31 pigment was significantly lower than that of the model covered with commercial iron brown pigment after 90 min of infrared exposure. The temperature difference between the two models reaching 9.8 °C indicates that the prepared pigment had high near-infrared reflectance, which can effectively reflect solar thermal radiation and reduce heat absorption. It demonstrates potential for application in building energy efficiency and environmental sustainability.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2024
·
IF 2.4
Li Mei,Du Rui,Wei Hedi,Chen Jiayi,Liu Rugeng,Zhang Meng,Han Wei
In order to investigate the influences of the additive (KF) on electrochemistry and deposit morphology of Pr, various electrochemical techniques were used to comparative investigate the electroreduction potential and diffusion coefficient of Pr 3+ and kinetic properties of Pr 3+ /Pr in LiCl–KCl-PrCl 3 before and after the addition of KF at different molar concentration ratios of F − to Pr 3+ ( k ). Cyclic voltammetry, square wave voltammetry, and reverse chronopotentiometry results showed that the value of k ( k = 0, 1, 2, 3, and 4) had no effect on reduction mechanism of Pr 3+ . With the increase of k , the reduction peak potential moved in the negative direction, the diffusion coefficient decreased, and diffusion activate energy increased. Meanwhile, the exchanged current densities ( j 0 ), charge transfer resistances ( R ct ), and activate energies ( E a ) were measured at different k by linear polarization technique, which illustrated that with the increase of k , j 0 gradually decreased, and E a and R ct increased. Furthermore, the electrochemical preparation of Pr aided by KF was explored by potentiostatic electrolysis at different k , and the products were characterized by XRD, SEM, and EDS, which indicated that with the increase of k , the morphology of metallic Pr changed from slender needles to granular. Graphical abstract
研究领域:
材料科学
·
电化学
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JOURNAL OF ELECTROCERAMICS
·
2025
·
IF 2.6
Yang Chunli,Wang Lei,Li Jun,Yao Wei,Liang Yanru,Wang Kai,Yun Sining
Y-doped BaZrO 3 has emerged as a promising ceramic material for hydrogen separation membranes. The conductivity of Y-BaZrO 3 (BZY) ceramics is highly dependent on the concentration of oxygen vacancies. In this work, BZY further individually doped with In and Pr were prepared by the citrate sol–gel combustion method. Effects of doping on the ceramic phase structure, oxygen vacancies, and micromorphology were investigated using a range of analytical techniques, including XRD, Raman spectroscopy, XPS, and SEM. The conductivity, hydrogen permeability, and stability of BaZr 0.7 Y 0.2 In 0.1 O 3−δ (BZYI) and BaZr 0.7 Y 0.2 Pr 0.1 O 3−δ (BZYP) ceramics were systematically evaluated. Upon doping, BZYI exhibits the most favorable conductivity, reaching 9.98 × 10 −3 S·cm −1 in dry air at 800 °C. At 900 °C, with water vapor introduced on the sweep side, the hydrogen permeation fluxes of BZYI and BZYP are 3.50 × 10 −9 mol·cm −2 ·s −1 and 2.60 × 10 −9 mol·cm −2 ·s −1 , respectively. Both samples were exposed to boiling water and a 100% CO 2 atmosphere at 900 °C for 3 h. Post-treatment XRD, Raman, and SEM analyses reveal no formation of heterophase, indicating excellent phase and microstructural stability.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Dongmin An,Yingyue Wang,Jialun Dai,Lanpeng Guo,Nan Liu
Rare earth doping was an effective method to upgrade the gas-sensing performance of sensors based on oxide semiconductors . In this paper, Pr was successfully doped into In 2 O 3 nanomaterials with a facile co-precipitation approach through a hydrothermal strategy. The as-obtained series of Pr doped In 2 O 3 nanocomposites were analyzed by some technical characterization. The gas-sensing tests were performed by using series of Pr/In 2 O 3 nanocomposites as sensitive materials. The results illustrated that the doping of Pr not only reduced the particle size of Pr/In 2 O 3 nanocomposites but also produced more active oxygen on the surface of In 2 O 3 , thus, the responses of Pr/In 2 O 3 -based sensors towards ethanol gas (112.40–50 ppm) were enhanced. A possible mechanism for the improved gas-sensing property of Pr decorated In 2 O 3 sensors was proposed.
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ACS Catalysis
·
2016
·
IF 9.307
Zhixin Zhang,Yehong Wang,Jianmin Lu,Chaofeng Zhang,Min Wang,Mingrun Li,Xuebin Liu,Feng Wang
Conversion of low-carbon olefins to higher alcohols or olefins via the formation of C–C bonds is an increasingly important topic. We herein report an example of converting isobutene and formaldehyde (38 wt % aqueous solution) to 3-methyl-1,3-butanediol (MBD), a precursor for isoprene. The reaction occurs through a Prins condensation–hydrolysis reaction over a praseodymium (Pr)-doped CeO2 catalyst. The best MBD yield (70%) is achieved over the Pr-doped CeO2 catalyst. Catalyst characterizations with high-angle annular dark field transmission electron microscopy (HAADF-TEM), pyridine adsorption infrared (IR) and Raman spectroscopy, and density functional theory (DFT) calculations show that the doped Pr is uniformly and highly dispersed in the CeO2 crystalline phase. In addition, the Pr doping creates more oxygen vacancy sites on CeO2 and thus enhances the Lewis acidity of the catalyst, which is responsible for the catalytic performance of the Pr-CeO2 catalyst.
研究领域:
催化化学
·
材料科学
·
有机合成
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Small Methods
·
2026
·
IF 8.7
Sheng Ma,Xinze Li,Taoda Liu,Ke Yuan,Mengjun Tang,Waqas Muhammad,Xiaoling He,Tian Ouyang,Xiao Zhang,Wenyan Tao,Yinghua Niu,Zhen Zhang,Weiqiang Lv
The development of low-cost and high-performance noble-metal-free catalysts for the oxygen evolution reaction (OER) is central to advancing alkaline water electrolysis. This work introduces a novel “composition–thermal history” design strategy, synergistically combining controlled A-site Sr 2+ doping with optimized high-temperature sintering (950°C) in Pr-based perovskite. The resulting Pr 0.75 Sr 0.25 Ni 0.7 Co 0.3 O 3 (PSNC-25) exhibits unprecedented nanostructuring and a maximized concentration of oxygen vacancies, unlocking efficient OER via lattice oxygen-mediated mechanism. Sr-induced lattice distortion drastically reduces oxygen vacancy formation energy from 2.06 to 1.14 eV, promoting facile lattice oxygen participation. Thermal engineering stabilizes high-valence Co 4+ /Ni 3+ states and enhances M─O covalency. Electrochemically, PSNC-25 achieves exceptional activity in 1 M KOH: a low overpotential of 389 mV at 10 mA cm −2 and a Tafel slope of 83 mV dec −1 , significantly surpassing undoped PrNi 0.7 Co 0.3 O 3 (η 10 ＞ 570 mV). It also exhibits robust durability, by > 120 h chronopotentiometry at 10 mA cm −2 with only ∼45 mV potential drift. This work establishes a rational framework for activating LOM in cost-effective perovskites through dopant-induced electronic modulation and nano-structural control, advancing scalable green hydrogen production.
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PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2016
·Vol. 34
·期 4
·428-434
·
IF 2.188
Hao TANG,Hui DENG,Qingbo REN,Dingzhou CAI,Yiming REN,Lang SHAO,Yongde YAN,Milin ZHANG
The electrochemical behavior of Pr(III) and formation process of Pr-Al intermetallics were investigated by different electrochemical methods. The reduction of Pr(III) ion to metallic Pr is an one-step three-electrons reaction. The reversibility of Pr(III)/Pr(0) system was evaluated by cyclic voltammograms with different scan rates. The co-reduction of Pr(III) and Al(III) ions formed three different Pr-Al intermetallics at electrode potentials around −1.40, −1.80, and −1.95 V vs. Ag/AgCl at 723 K, respectively. Open-circuit chronopotentiometry and electromotive force (emf) measurements were carried out to estimate the relative molar Gibbs energies of Pr for the formation of different Pr-Al intermetallics in the temperature range of 723–843 K. The activities of Pr in the Pr-Al intermetallic compounds were calculated.
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