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
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电化学
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纳米技术
·
固态物理
·
能量存储
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DOI
高影响因子
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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高影响因子
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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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Tao Wang,Junling Yu,Jianmin Liu,Feng Jiang,Guo Feng,Jian Liang,Lifeng Miao,Quan Zhang,Qian Wu,Xinbin Lao
A fluorine-free route has been developed to fabricate V/Pr co-doped zircon (ZrSiO 4 ) ceramic pigments with Na 3 VO 4 and Pr(NO 3 ) 3 ·6H 2 O as colourants . The as-prepared pigments were characterized by XRD , Raman, XPS , UV–vis, FE-SEM, TEM and automatic colourimeters . The results show that Na 3 VO 4 can not only act as colourant to produce blue hue, but as mineralizer to accelerate the formation of V/Pr co-doped ZrSiO 4 pigment. A colour tuning between blue, green and yellow can be achieved by increasing the mole ratio of Pr/V, and the most intense yellow hue (L* = 74.55, a* = −0.38, b* = 46.82) is obtained at a mole ratio of Pr/V = 0.5. Both Pr 4+ and Pr 3+ cations are co-existed in the pigments, where Pr 4+ contributes to the generation of yellow hue while Pr 3+ undermines the yellow hue. The good chromatic ability in glaze at high temperature suggest its potential application in ceramic decoration.
研究领域:
材料科学
·
陶瓷工程
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Chenwei Xiong,Rui Hao,Kewen Tao,Huashan Li,Shaopeng Lin,Decai Ma
This study has demonstrated that lithium niobate doped with praseodymium (LiNbO 3 :Pr), which initially did not exhibit persistent luminescence(PersL), can display significant PersL performance through the modulation of the lithium-to-niobium ratio (R LN ). By adjusting the R LN to 1, LiNbO 3 :Pr achieved enhanced PersL, lasting several minutes, with the afterglow's duration further influenced by the R LN . Thermoluminescence (TL) assays and energy diagram analyses have elucidated that the presence and depth of oxygen vacancy defects are critical for both the emergence and longevity of PersL LiNbO 3 :Pr polycrystals . These insights enhance the understanding of PersL mechanisms in lithium niobate crystals and highlight their potential for application in optical information storage.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
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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DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2026
·
IF 5.1
Tingting Zhao,Hao Wang,Mei Li,Shang Peng,Bohao Zhao,Qi Feng,Yanlong Chen,Yingxue Han,Jun Yuan,Ningxiao Feng,Jiao An,Sheng Jiang,Chuanlong Lin
Multimodal luminescent (MML) materials have attracted significant attention in anti-counterfeiting applications due to their high sensitivity, concealability, and compatibility. However, limited understanding of their mechanisms hinders rational material design and further advancement. Herein, we report that NaNbO3: Pr3+ phosphors, synthesized via solid-state reaction, exhibit distinctive pressure-responsive MML behaviors, encompassing photoluminescence (PL), persistent luminescence (PersL), and mechanoluminescence (ML). Under UV irradiation at increasing pressure, the PL intensity exhibits a volcano-shaped trend, peaking at approximately 4.5 GPa. After the irradiation is terminated, both the PersL intensity and decay time remain nearly unchanged. Conversely, the ML intensity decreases exponentially with pressure and becomes almost completely quenched around 4.0 GPa. In situ high-pressure structural and spectroscopic analyses indicate that the distinctive MML phenomena likely arise from the different pressure sensitivities of the coordination environments associated with deep traps and shallow traps, which offers insights into the underlying mechanism of MML materials. Furthermore, the integration of multiple luminescence modes enables rich and tunable emission responses, paving the way for advanced stress-sensing platforms and high-security anti-counterfeiting technologies.
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DOI
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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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Jiahui Xu,Haoyun Zhao,Yujun Guo,Jiayi Qu,Xingtai Chen,Xiaoning Wang,Davoud Dastan,Xiaoming Tan,Xi-Tao Yin,Xiaoguang Ma
Utilizing a one-step hydrothermal synthesis, this study produced Pr-doped In 2 O 3 -based ethanol gas sensors. The material’s elemental composition and morphology were investigated by XPS, XRD, SEM, and other characterization methods. Effective substitution of In 3 + lattice sites by Pr 3+ /Pr 4+ ions was achieved, generating smooth irregular polyhedral particles composed of interlocked octahedra with varying sizes. At the optimum temperature of 300 °C, the sensor exhibited a response of 179–100 ppm ethanol, accompanied by rapid response/recovery times of 43 s and 13 s. Compared to pure In₂O₃, the response value increased by 10 times, and the recovery time was reduced by 66 s, while exhibiting excellent selectivity and long-term stability (>150 days). The enhanced ethanol response stems from increased adsorbed oxygen density, which creates a more polarized initial high-resistance state for subsequent gas-sensing reactions by forming a more pronounced surface electron depletion layer and higher initial barrier. Upon contact with target gases, the higher density of adsorbed oxygen participates as reaction sites and promotes surface redox reactions. This leads to a greater flux of released captured electrons, triggering a sharp decrease in the surface barrier and a dramatic macroscopic resistance transition in the material. Ultimately, this significantly amplifies the sensor's response magnitude. The work concludes by presenting a detailed mechanistic analysis of the sensing behavior.
研究领域:
材料科学
·
传感器与仪器
·
气体传感技术
·
纳米材料
·
化学工程
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
De-hua Wang,He-bin Li,Hong-wei He,Yang Deng,Ye Lu,Le Zhang,Ke-qing Ruan,Xiao-xiong Wang
Piezoelectric catalysis has become an emerging research field in recent years, which has received extensive attention. Nanoparticles and nanowires have been developed as piezoelectric catalytic materials. However, in practical research, the use of nanoparticles is not easy for the recovery of samples and will cause secondary pollution, and the current piezoelectric catalysis requires the help of high-frequency ultrasound, which increases the consumption of extra energy and cannot be applied on a large scale. In this study, a self-supporting macroscopic flexible inorganic (Ba,Ca)TiO3:Pr nanofiber membrane was successfully prepared by electrospinning. Natural energy (water flushing) was used to drive the flexible inorganic (Ba,Ca)TiO3:Pr nanofiber membrane for piezoelectric catalytic degradation of organic dyes. The results show that the flexible inorganic (Ba,Ca)TiO3:Pr nanofiber membrane driven by water washing has an obvious piezoelectric catalytic degradation effect on dyes. When the water flow rate was 450 L/h and the concentration of CR solution was 10 mg/L, the catalytic efficiency can reach 91.69%. This study provides a green and feasible method for the preparation of flexible inorganic piezoelectric catalytic materials and the catalytic degradation of organic dyes.
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高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 42
·15996-16003
·
IF 8.067
Wei Shi,Zefei Peng,Song Chen,Xueling Yan,Hua Xu,Lan Liu
Although metal oxide nanofibers (MO-NFs) based field-effect transistors (FETs) prepared by electrospinning have gained great attention, it is still challenging to develop MO-NFs directly on flexible substrates such as polyimide (PI) to achieve a high flexibility due to the high annealing temperature. In this work, using a UV pretreatment and a subsequent “combustion synthesis” process, high-quality Pr-doped In2O3 (InPrO) electrospun NFs were successfully fabricated on a flexible PI substrate at a relatively low temperature (380 °C). It was found that the InPrO-based flexible FET (f-FET) prepared by UV pretreatment and low annealing temperature not only has a good interfacial adhesion but also show a good flexibility. When the f-FET was wrapped around the rigid cylindrical rod with a radius of 5 mm, it exhibited good performance including a high μFE of 2.12 cm2 V−1 s−1, a large Ion/Ioff of ∼108, and an excellent cycling stability (1000 bending cycles). This low-temperature processing route will certainly contribute to the future flexible electronics manufacturing.
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高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Jian Fang,Jing-Jing Xue,Rong-Pu Xiao,Xi Chen,You-Min Guo,Ji-Ming Song
The development of high performance triethylamine (TEA) sensors for the protection of human safety is essential. Herein, we reported a promising semiconductor metal oxide (SMO) gas sensor based on Pr-doped ZnO nanospindles as the sensing materials for the detection of TEA. The elemental composition and micromorphology of the as-prepared samples were systematically analyzed. The gas sensing performance of the pristine, 1 mmol%, 2 mmol%, and 3 mmol% Pr-ZnO sensor was evaluated. Among them, the 2 mmol% Pr-ZnO sensor exhibited the highest response value for TEA gas, and reached 158.0 towards 50 ppm TEA at 200 °C, which was about 10.0-fold higher than the response value of the pristine ZnO sensor. In addition, the 2 mmol% Pr-ZnO sensor also showed good reproducibility, rapid response/recovery time (10/46 s), theoretical limit of detection (168 ppb), outstanding long-term stability, and excellent selectivity for TEA gas.
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DOI
高影响因子
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