IONICS
·
2020
·Vol. 26
·期 8
·3901-3909
·
IF 2.394
Li Mei,Sun Zhongxuan,Guo Dan,Han Wei,Sun Yang,Yang Xiaoguang,Zhang Milin
The electrode reaction of Pr(III) and coreduction of Pb(II) and Pr(III) were studied on an inert W electrode in eutectic LiCl-KCl to extract Pr from molten salt. The electrode process kinetic of Pr(III) on W electrode was firstly explored employing cyclic voltammetry (CV) and Tafel technique, such as the diffusion coefficient of Pr(III) in eutectic LiCl-KCl and the exchange current density ( j 0 ) for Pr(III)/Pr(0) couple and the electrode reaction activation energy. Then, various electrochemical techniques were used to investigate the coreduction of Pb(II) and Pr(III). Four cathode current peaks ascribed to the formation of Pr x Pb y intermetallic compounds were detected, which indicated that the Pr could deposit on pre-deposited Pb film, react with Pb, and form Pr x Pb y intermetallic compounds. Furthermore, the electrolytic products formed by galvanostatic electrolysis were characterized by scanning electron microscopy coupled with energy dispersive X-ray diffraction, which illustrated the formation of PrPb 3 intermetallic compound in LiCl-KCl-PbCl 2 -PrCl 3 melt.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Yize Li,Weiqiang Zhou,Xuemin Duan,Danqin Li,Jingkun Xu,Zian Huang,Xiaojing Hao
Exploring high-performance metal oxide electrode materials is an essential way to boost the supercapacitor performance, and metal atom doping can significantly increase oxygen vacancies to improve the conductivity of electrode materials. A hydrothermal method is proposed for the preparation of sea urchin-like Pr-doped W 18 O 49 . A series of characterizations detected that Pr-doped W 18 O 49 produced significant lattice distortion and more amorphous regions, and the better electrochemical performance came from the increased concentration of oxygen vacancies, enlarged lattice spacing, higher specific surface area, and faster ion transport after Pr doping. Electrochemical measurements indicate that the specific capacitance of Pr-doped W 18 O 49 is improved from 381 F g −1 to 453 F g −1 at 3 A g −1 and exhibits a remarkable capacity retention of 95.6 % over 4000 cycles. An asymmetric supercapacitor assembled with this electrode and PPy achieved a high energy density of 21.9 Wh kg −1 at a power density of 701.5 W kg −1 , indicating the significance of Pr-doped W 18 O 49 for energy conversion and storage applications.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 7
·6829-6834
·
IF 1.798
Su Chang,Li Yu,Li Shouchun,Liu Li,Guo Xuexin,Lian Hongwei,Guan Xiulong
Pure and Pr-doped α-Fe 2 O 3 nanotubes are successfully synthesized via electrospinning and following calcined method. The crystal, morphologies structures and composed of the as-prepared samples are investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), respectively. The researches of the gas sensing properties of the samples show that Pr-doped α-Fe 2 O 3 nanotubes possess excellent sensitive to ethanol, and the response value of Pr-doped α-Fe 2 O 3 nanotubes to 10 ppm ethanol is 21.3 at the operating temperature 240 °C, which is much higher than that of pure α-Fe 2 O 3 nanotubes (1.5). That is to say that the ethanol sensitive of α-Fe 2 O 3 nanotubes is improved remarkably by doping Pr. Moreover, Pr-doped α-Fe 2 O 3 nanotubes show good selectivity and long-term stability.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2021
·
IF 2.993
Jinxiang Guo,Zhaofei Tong,Qihua Liang,Fangyu Gan,Lepeng Wei,Qingrong Yao,Jianqiu Deng,Zhao Lu,Huaiying Zhou
Bi 1-x Pr x FeO 3 material with perovskite structure was prepared using organic tartaric acid-assisted sol–gel self-propagating combustion method to obtain high-efficiency microwave absorption materials. The influence of the introduction of Pr on dielectric properties and permeability was further studied. After 15% Pr introduced, the lowest reflection absorption loss reaches –32.34 dB, but the absorption bandwidth is only 2.25 GHz. When Pr is 5%, the lowest reflection absorption loss value of −27.31 dB is obtained, and the effective bandwidth which below −10 dB is 3.41 GHz. The structural changes in the process of Pr replacing Bi were analyzed to explore the properties of BPFO perovskite. The influence of strong interaction force, residual magnetization, and natural resonance of ceramic nanoparticles on microwave absorption performance was explored. This work supplies a reliable candidate material for making up electromagnetic attenuation ceramic materials with excellent properties.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2024
·
IF 3.8
Yuxin Sun,Yunshuo Wu,Zhuoyi Zhang,Xuanhao Wu,Haiqiang Wang,Zhongbiao Wu
Graphical Ce-Pr co-doped Co 3 O 4 achieved 100% N 2 O conversion at 400 °C over Pr 0.02 Ce 0.2 Co 1 . The introduction of Ce facilitated the formation of oxygen vacancies, which were essential for N 2 O activation. But these Ce species strictly inhibited Co 3 O 4 crystallization and surface exposure, which were unfavorable to N 2 O decomposition. By the codoping of Pr, these negative effects were eliminated, leading to remarkable catalytic performance. Nitrous oxide (N 2 O) has gained increasing attention as a non-carbon dioxide greenhouse gas, and catalytic decomposition is an effective method for mitigating its emissions. In this study, Ce-Pr Co-doped Co 3 O 4 was synthesized via a coprecipitation method and used for the catalytic decomposition of N 2 O. The experimental results revealed that the N 2 O decomposition achieved 100% conversion at 400 °C on the catalyst with a Pr/Ce/Co molar ratio of 0.02:0.2:1, exhibiting an 80 °C decrease of T 100 compared with that of Co 3 O 4 . The introduction of Ce reduced the size and crystallization of Co 3 O 4 particles, increased the activity of the lattice oxygen of Co 3 O 4 , and facilitated the formation of oxygen vacancies, thereby enhancing the activation of N 2 O. However, the introduction of Ce inhibited the crystallization of Co 3 O 4 and the surface coverage of CeO 2 decreased the exposure degree of N 2 O molecules to the Co 3 O 4 surface. Co-doping strategy of Ce-Pr was performed to alleviate the negative effects of ceria. Consequently, the incorporation of Ce and Pr species enhanced the redox properties of Co 3 O 4 , leading to remarkable catalytic performance of N 2 O decomposition. This study elucidated the interaction between Ce and Pr dopants and Co 3 O 4 , and encouraged more attention on designing novel catalysts for N 2 O mitigation.
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
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Lingfang Zou,Zhuan Li,Zonglong Gao,Fu Chen,Wenjie Li,Yong Yu,Yimin Li,Peng Xiao
Improving the piezoelectric activity of lead zirconate titanate (PZT) ceramics is of great importance for practical applications. In this study, the influence of Pr 3+ doping on the ferroelectric phase composition, microstructure, and electric properties on the A-site of (Pb 1-1.5x Pr x )(Zr 0.52 Ti 0.48 )O 3 is extensively investigated. A dense and fine microstructural sample is obtained with the introduction of Pr 3+ . The results show that the morphotropic phase boundary (MPB) moves to the rhombohedral phase region. The rhombohedral and tetragonal phases exhibit an ideal coexistence in the 4 mol.% Pr 3+ doped (PPZT4) samples. Lead vacancy and the reduction of the potential energy barrier are considered to be the key mechanisms for donor doping, which is upheld by the Pr 3+ doping. Combining the I-E hysteresis loops with the P-E hysteresis loops, it becomes apparent that both contribution maximums of the domain switching and residual polarisation are in PPZT4. Moreover, the thermal aging resistance of PZT is improved by doping, and the temperature stability is optimised from 83% in PZT to 96% in PPZT4. Hence, an appropriate amount of Pr 3+ doping can effectively improve the piezoelectric activity of PZT ceramics in the MPB area and optimise the performance stability of the material under application temperatures.
研究领域:
材料科学
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电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2021
·
IF 3.712
Ye Zhang,Yong Gao,Peng Wang,Duo Na,Zhenming Yang,Jinsong Zhang
Extraction reactor is a major research area of interest within the field of rare earths extraction and separation. SiC foam offers excellent material characteristics as well as three-dimensional (3-D) reticulated structure; however, very little research has been carried out on its application in extraction reactor so far. In this work, a static mixer reactor based on SiC foam was designed and demonstrated to extract and separate Ce(III) and Pr(III) from nitric acid media by using 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester (P507) as extractant. The structure–performance relationship between SiC foam and extraction performance was studied by experiment combined with computational fluid dynamics (CFD) simulation. The experiment data are in good agreement with the simulation results. Contrast experiment by using a Kenics mixer was carried out, and SiC foam shows better extraction and mass transfer performance. Using the optimal structural SiC foam (pore size D = 2.3 mm, open porosity ε = 85%, foam length L = 80 mm), high extraction efficiency η (Pr(III): 94.6%, Ce(III): 88.5%) and separation factor β (2.27) between Ce(III) and Pr(III) is achieved at a high total throughput of 200 mL/min. Besides, overall volumetric mass transfer coefficient K L a of Pr(III) and Ce(III) are 0.519 and 0.378 s −1 at the residence time τ of 3.6 s, respectively, which reach the high level of microchannel reactors and are better than conventional extractors and other static mixers. SiC foam is found to be applicable as a static mixer for efficient and high-throughput extraction and separation of rare earths.
研究领域:
稀土提取
·
分离工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 19
·6953
·
IF 3.748
Yaohui Xu,Pingkeng Wu,Mingjin Wu,Yuehe Gu,Hongguang Yu,Zhao Ding
Pr-doped CeO2with different doping levels was prepared from Ce(NO3)3∙6H2O and Pr(NO3)3∙6H2O by solvothermal method without any additional reagents, in which the mixed solution of ethylene glycol and distilled water was employed as a solvent. The influences of Pr-doping on phase composition, crystal structure and morphology were investigated, as well as Pr valence and oxygen vacancy defects. The Pr cations entered into the CeO2crystal lattice with normal trivalence and formed a Pr-CeO2solid solution based on the fluorite structure. The larger trivalent Pr was substituted for tetravalent Ce in the CeO2crystal and compensated by oxygen vacancy defects, which caused the local lattice expansion of the crystal lattice. Moreover, the Pr-doped CeO2solid solutions exhibited visible color variation from bright cream via brick red to dark brown with the increasing of Pr contents. The degradation of AO7 dye was also investigated using a domestic medical ultraviolet lamp; the removal efficiency of AO7 by 1% and 2% Pr-doped CeO2approached 100%, much higher than 66.2% for undoped CeO2.Keywords:CeO2;Pr-doping;photocatalysis;pollutant degradation;mesoporous structure
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 6
·5771-5779
·
IF 2.195
Liu Heng,Zheng Shuaizhi,Chen Qiang,Zeng Binjian,Jiang Jie,Peng Qiangxiang,Liao Min,Zhou Yichun
HfO 2 thin films with different praseodymium doping contents (Pr:HfO 2 ) were fabricated by chemical solution deposition (CSD) method at ambient conditions. The chemical bonding and the composition of Pr doped HfO 2 thin film were characterized by X-ray photoelectron spectroscopy (XPS), while the structural properties were investigated by glancing incidence X-ray diffraction (GIXRD) and high resolution transmission electron microscopy (HRTEM). It is found that the ferroelectric orthorhombic phase was induced in the HfO 2 based thin films by Pr doping. The combined results of P–E (polarization–electrical field) and C–V (capacitance–voltage) measurements demonstrated that the 5 mol% Pr doped HfO 2 film exhibited a distinct ferroelectricity, with a maximum remanent polarization ( P r ) of 6.9 µC/cm 2 and a coercive field ( E c ) of 1.2 MV/cm. Notably, the polarization did not show obvious degradation over 1 × 10 8 switching cycles, suggesting good endurance performance of the Pr doped HfO 2 thin film. These results indicate that Pr dopant could effectively induce ferroelectricity in HfO 2 thin films, thereby becoming a new member of dopants for HfO 2 based ferroelectrics.
研究领域:
材料科学
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电子工程
✓ 已验证
DOI
高影响因子
Silicon
·
2019
·Vol. 12
·期 3
·585-594
·
IF 1.21
Wang Qikun,Wang Yongqing,Chang Qibing,Liu Han,Yang Yulong,Zhang Xiaozhen
To obtain the ultrafine pigment for ink-jet printing, ultrafine spherical Pr-ZrSiO 4 pigment was prepared by sol-gel-microemulsion method (S-G-M). In the emulsion, ZrO 2 and SiO 2 sols are used as water phase, cyclohexane serves as oil phase, Triton X-100 and 1-hexanol are chosen as surfactant and co-surfactant, respectively. The results show that without the introduction of demulsifier, the sol/oil microemulsion system is demulsified automatically due to the transformation of liquid/liquid to solid/liquid interface following the transformation from sol to gel. The obtained Pr-ZrSiO 4 pigment owns uniform spherical particles with the average particle size of about 0.785 μm, which is suitable for the ink-jet printing. The CIE coordination of the pigment is L* = 87.63, a* = −3.82, b* = 65.68, which shows bright lemon yellow. Hence, the ultrafine pigment in this work has the good application prospects.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Bing-Jie Wang,Xing Zhang,Jian Tang,Yi-Lei Li,Mu Lan,Wen-Ning Ren,Xin Chang,Sheng-Jiang Huang,Yan Jiao,Ruo-Ding Mao,Xiao-Hui Wu,Le-Zhong Li
With the miniaturization, chip, and integration of electronic products, the working frequency of electronic components is also getting higher and higher, which puts forward requirements for us to seek high-frequency materials with higher performance. To enhance NiZnCo ferrite properties, this study introduced the rare earth element Pr for modification and thoroughly examined its impact. The material Ni 0.55 Zn 0.3 Co 0.15 Pr x Fe 2- x O 4 (NZCPF, 0 ≤ x ≤ 0.1) was synthesized by sol-gel self-propagating technique. The X-ray diffraction of NZCPF indicates that Pr 3+ doped NiZnCo ferrites still keep the cubic spinel structure. With the increasing substitution of Pr 3+ ions in NiZnCo ferrite, the average grain size of the sample decreases from 1.05 μm to 0.73 μm. After the addition of Pr 3+ ions, the dielectric loss takes its minimum value (0.41@100 Hz), and the DC resistivity ρ takes its maximum value (4×10 6 Ω·m@30℃). The value of μ' (@10 MHz) monotonically decreases from 11.9 to 5.9 as the doping amount of Pr 3+ ions, denoted by x , increases. The saturation magnetization intensity decreases from 68.05 to 58.45 emu/g, and maximum magnetic loss decreases about 30% (0.65@1 GHz). It is worth noting that the resonance frequency f r increases from 343 MHz to 638 MHz with x increases, which is a substantial improvement compared to previous studies. Generally, the introduction of Pr 3+ ions into NiZnCo ferrite results in outstanding electromagnetic characteristics, offering a valuable reference to the advancement of compact and high-frequency devices.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Botao Fan,Hao Zhang,Bang Gu,Feng Qiu,Qiue Cao,Wenhao Fang
Electrocatalytic conversion of renewable biomass is emerging as a promising route for sustainable chemical production; hence it urgently calls for developing efficient electrocatalysts with low potentials and high current densities. Herein, a Pr-doped Co(OH) 2 hexagonal sheet (Pr/Co = 1/9, in mole) is synthesized by electrodeposition as highly performant catalyst for 5-hydroxymethylfurfural (HMF) oxidation reaction (HMFOR) to produce 2,5-furandicarboxylic acid (FDCA). This novel and low-cost catalyst possesses a rather low onset potential of 1.05 V (vs. RHE) and requires only 1.10 V (vs. RHE) to reach a current density of 10 mA cm −2 for HMFOR, significantly outperforming Co(OH) 2 benchmark (i.e., 210 mV higher to reach 10 mA cm −2 ). The origin of Pr promotion effect as well as the evolution of CoOOH catalytic sites and HMFOR process has been deeply elucidated by physical characterizations, kinetic experiments, in situ electrochemical techniques, and theoretical calculations. The unique Pr-ameliorated CoOOH active centers enable 100% conversion of HMF, 99.6% selectivity of FDCA, and 99.7% Faraday efficiency, with a superior cycling durability toward HMFOR. This can be one of the most outstanding results for Co-based HMFOR catalysts to date in the literature. Thereby this work can help open up new horizons for constructing novel and efficient Co-based electrocatalysts by the utilization of lanthanide elements.
研究领域:
材料科学
·
电化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）