OPTICAL MATERIALS
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2021
·
IF 3.08
Zuodong Liu,Qilong Shen,Yuqing Wang,Songchang Fu,Litao Yang,Xue Chen,Bing Liu,Guoqiang Yi,Bingchu Mei,Qiangshan Jing,Peng Liu
A series of PrF 3 -doped SrF 2 ceramics were fabricated by the hot-pressed (HP) sintering method. The influence of PrF 3 concentrations on the microstructure and optical characterizations of transparent ceramics was investigated. PrF 3 doping was found to have a positive effect on increasing optical transmittance . The luminescence intensity and lifetime quenching of Pr:SrF 2 ceramics at high doping concentrations were attributed to the Pr 3+ -Pr 3+ interactions through the intense CR process. The luminescence color of Pr:SrF 2 ceramics was tuned from the blue region to the reddish region, and finally to the orange region with increasing PrF 3 concentrations. The effect of sintering temperature on the optical transmittance and microstructure of Pr:SrF 2 ceramics was also measured and discussed. The highest transmittance of the Pr:SrF 2 ceramic (doped with 5 wt% PrF 3 and sintered at 950 °C) at 350 nm and 1200 nm were 90.4% and 91.9%, respectively.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Dongjia Li,Haijun Chen,Xinyi Dai,Fuzhong Wu,Shuie Li,Yi Mai
LiNi0.5Mn1.5O4 (LNMO) has broad application prospects due to its high discharge platform and low cost. However, the side reactions of the electrolyte during high-temperature and high-voltage cycling severely limit its commercial development. In this study, PrF3 nanocoatings were constructed by wet chemistry to stabilize the surface of LNMO electrodes to solve such problems. The electrochemical test results show that the PrF3 nanocoating can effectively improve the electrochemical performance of the LNMO electrode, especially at high temperature. In the voltage range of 3.5–4.9 V, the 1 wt % PrF3-coated electrode exhibited a capacity retention of 91.4% after 100 cycles at a rate of 0.2C and 55 °C, while the pristine LNMO electrode could not release its capacity after 91 cycles. At a rate of 10C, the discharge capacity of pristine LNMO was only 48.2 mAh g–1, while that of LNMO-PF1 was 88.9 mAh g–1. The characterization of the samples before and after coating further indicates that the PrF3 nanocoating can stabilize the LNMO electrode surface, inhibit its side reactions with the electrolyte, enhance the structural stability, and improve the lithium ion diffusion kinetics. Our study provides an effective way to stabilize the energy density and cycling performance of LNMO at high temperature and high voltage and provides an idea for the protection strategy of high-energy-density lithium batteries working at high voltage.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yuhang Wang,Guangxin Fan,Dafeng Zhang,Yanping Fan,Baozhong Liu
The enhanced effect of metal catalysts is crucial to achieve advanced performance of hydrogen storage system. Rational design of catalysts with superior catalytic activity is significant to regulate the re-/hydrogenation kinetics of MgH 2 . Herein, Ti 3 C 2 -supported praseodymium(III) fluoride (PrF 3 ) nanoparticles (PrF 3 /Ti 3 C 2 ) composite was prepared by hydrothermal method , which exhibited superior catalytic activity toward hydrogen storage of MgH 2 . The onset temperature of dehydrogenation was reduced to 180 °C after adding 5 wt% PrF 3 /Ti 3 C 2 , corresponding to a reduction of 107 °C compared with pristine MgH 2 . About 7.0 wt% hydrogen was rapidly desorbed within 3 min at 260 °C and 6.6 wt% hydrogen was absorbed within 36 s at 200 °C for MgH 2 -5 wt% PrF 3 /Ti 3 C 2 . Moreover, MgH 2 -5 wt% PrF 3 /Ti 3 C 2 exhibited an excellent capacity retention of 92.5% even after 10 cycles. Experimental results reveal that the electron transfer among Ti-species (Ti 0 , Ti 2+ , and Ti 3+ ) occurred due to the striking enhanced effect of PrF 3 on Ti 3 C 2 MXene during the reaction process, and the synergistic action between Ti-species and PrF 3 are responsible for the markedly enhanced hydrogen storage properties of MgH 2 . This study is helpful to the design and optimization of hydrogen storage materials for mobile application.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2023
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IF 3.6
Zuodong Liu,Yue Cao,Jiashun Wang,Siya Li,Qilong Shen,Yongsheng Yu,Bingchu Mei,Qiangshan Jing,Peng Liu
Near-infrared pumped up-conversion luminescent PrF 3 and YbF 3 co-doped SrF 2 ceramics were fabricated by the hot-pressing sintering technique, and the pellets were transparent with a primrose yellow appearance. The influence of YbF 3 co-doping levels on the optical qualities and microstructures of ceramics was investigated. We identified the mechanisms to realize up-conversion luminescence in the visible range from 3 P 0,1 levels (Pr 3+ ) under near-infrared wavelength pumping sources other than the near ultraviolet to blue region photons. Yb 3+ ions inducing a broad and intense absorption band at the 900–1050 nm region, and the absorption coefficient and cross-section at 980 nm are 7.57 cm −1 and 4.19 × 10 −21 cm 2 in the ceramic co-doped with 15 wt% YbF 3 , respectively. The intense up-conversion luminescence bands at 480, 520, 540, and 600 nm under 980 nm excitation were attributed to 3 P 0 → 3 H 4 , 3 P 1 → 3 H 5 , 3 P 0 → 3 H 5 and 1 D 2 → 3 H 4 transitions of Pr 3+ ions, respectively.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Progress in Natural Science-Materials International
·
2021
·Vol. 31
·期 1
·152-158
·
IF 3.607
Zhonghui Sun,Jia Zhou,Qingan Zhang
A new MgH 2 –PrF 3 –Al–Ni composite was prepared by ball milling under hydrogen atmosphere. After initial dehydrogenation and rehydrogenation, Pr 3 Al 11 , MgF 2 , PrH 3 and Mg 2 NiH 4 nanoparticles formed accompanying the main phase MgH 2 . The hydrogen absorption-desorption properties were measured by using a Sieverts-type apparatus. The results showed that the MgH 2 –PrF 3 –Al–Ni composite improved cycle stability and enhanced hydrogen desorption kinetics. The improvement of hydrogen absorption-desorption properties is ascribed to the synergetic effect of the in situ formed Pr 3 Al 11 , MgF 2 , PrH 3 and Mg 2 NiH 4 nanoparticles. This work provides an important inspiration for the improvement of hydrogen storage properties in Mg-based materials.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）