JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Wenxu Wang,Yue Sun,Pengcong Wen,Yueqiang Zhou,Dongyun Zhang,Chengkang Chang
This study presents a novel modification strategy involving the replacement of Mn with Sc in the cathode of NaNi 1/3 Fe 1/3 Mn 1/3 O 2 (NFM). The results of this study confirmed that Sc doping introduced strong Sc–O bonds to enhance the bonding between transition metal ions and O 2− . Additionally, Sc doping reduced the proportion Mn 3+ in the material (from 50.23% to 47.46%), thereby inhibiting the material structural distortion due to the Jahn–Teller effect induced by Mn 3+ . These factors were the main contributors to the improved cycling performance of the modified material. Furthermore, the introduction of Sc decreased the band gap of the material (1.7416–1.6706 eV) and the Na + activation barrier energy (0.773–0.732 eV). These changes not noly facilitated the de-embedding of Na + in the material lattice but also significantly enhanced the material electronic conductivity, leading to an excellent rate performance of the modified material. These results indicate that the NFM-Sc0.01 sample maintained an ultra-high capacity retention of 86.45% after 200 cycles at 1 C. At 5 C, the discharge capacity of NFM-Sc0.01 significantly increased from 79.3 mAh g −1 in NFM to 93.4 mAh g −1 , demonstrating great potential for industrialized applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2025
·
IF 7
Shaokang Guo,Jian Peng,Neeraj Sharma,Jiaqi Pan,Yi Liao,Xinhao An,Hanchi Li,Zhisong Ge,Chunliang Zhou,Wen Liang Tan,Junnan Liu
Na3V2(PO4)2F3 (NVPF) has been considered as a promising NASICON-type (sodium superionic conductor) cathode material for sodium-ion batteries (SIBs). However, their development has been limited by poor electronic conductivity. To address this issue, a series of Sc-doped carbon-coated Na3V2–xScx(PO4)2F3/C, x = 0, 0.02, 0.04, 0.06, 0.08, and 0.1 were synthesized by the sol–gel method. Sc is found to partially stabilize the crystalline framework, reduce deformation during Na+ insertion/extraction, and reduce polarization, which in turn impacts the diffusion of Na+ ions in the crystal lattice. The optimized NVPF has good electronic conductivity and cycling stability; in particular, the NVSPF/C-0.04 electrode exhibits the highest discharge specific capacity (125 mAh g–1 at 0.2 C), excellent rate performance (87 mAh g–1 at 30 C), and outstanding cycling performance (90% capacity retention after 1000 cycles at 10 C and 94% capacity retention after 100 cycles at 1 C). Density functional theory shows that the Sc-doping effectively improves the electronic conductivity of the NVPF. In situ and operando synchrotron XRD data show that the NVSPF/C-0.04 electrode undergoes phase transitions during charge/discharge at 0.2 and 2 C and indicates the reason for the capacity decay at 5 C. Finally, the NVSPF/C-0.04//HC (hard carbon) full cell performs with a good discharge specific capacity (112 mAh g–1 at 1 C). This study presents a feasible approach to developing high-performance cathode materials that can be used in SIBs, and it holds great potential for the future advancement of SIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2022
·
IF 20.831
Qiao Wang,Chuang Yu,Liping Li,Xiaoqing Liu,Xin Zhang,Guichen Gao,Yaowen Wang,Guangshe Li
Solid-state sodium batteries (SSSBs) display great potential in scale energy storage for their safety, cost and sustainability. However, it is a great challenge to achieve high ionic conductivity and temperature adaptability for most sodium-ion solid electrolytes. Here, we first demonstrate that Sc 3+ -doped Na 3 Zr 2 Si 2 PO 12 (NASICON) is a promising electrolyte for a wide temperature range utilizing in SSSBs from 0 to 80 °C. Optimal Na 3.4 Zr 1.6 Sc 0.4 Si 2 PO 12 shows a superior Na-ion conductivity, up to 1.77 × 10 −3 S cm −1 at room temperature, and excellent Na metal compatibility, as confirmed by a symmetrical cell test. Furthermore, the solid-state sodium battery with the configuration of Na 3 V 2 (PO 4 ) 3 /Na 3.4 Zr 1.6 Sc 0.4 Si 2 PO 12 /Na maintains a discharge capacity of 98.7 mAh g −1 at 1C after 300 cycles at room temperature. Even at 0 °C, the battery still displays a reversible capacity of 99.2 mAh g −1 at 0.1C after 100 cycles. Through the structure analysis and ex-situ and in-situ electrochemical characterizations, the reasons that dominate the excellent performance of the assembled all-solid-state sodium battery with NASICON electrolytes are initially revealed.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Bin Tong,Gang Meng,Zanhong Deng,Jingjing Gao,Hongyu Liu,Tiantian Dai,Shimao Wang,Jingzhen Shao,Ruhua Tao,Fantai Kong,Wei Tong,Xuan Luo,Xiaodong Fang
Identifying the defect type which closely correlates with gas/metal oxide semiconductor (MOS) interfacial charge exchange is of utmost importance for rationally designing high performance MOS gas sensors, which are essential for the emerging sensing electronics for assessing the personal health and environment pollution. Herein, we report the sensing performance of p-type NiO toward volatile organic compounds (VOCs) molecules could be drastically improved by Sc dopant . At an optimal doping ratio of 7.4 at.%, the sensor response to 100 ppm acetone was boosted from 8.2 (pure NiO) to 109.4, with a low detection limit of 10 ppb. Comprehensive defect characterizations indicate surface unsaturated oxygen vacancy (V O ) defects act as active sites that facilitate the interfacial charge exchange at elevated temperatures. Our work highlights that abundant V O defects induced by aliovalent Sc dopant play an important role in boosting the sensitivity of p-type NiO toward VOCs, and provide valuable guidance in designing high performance p-type MOS sensors.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Kun Nie,Xiaodong Zhang,Xiaoman Zhang,Xueliang Zhang,Luoxin Wang,Jing Xu,Lefu Mei,Hua Wang
All-inorganic lead-free double perovskites have great application potential due to their unique crystal structure and low toxicity. Among them, the shortcomings of indirect band gap and inhibiting transition in some lead-free double perovskites reduce their optical performance. In this study, the facile method at low temperature and atmospheric pressure was used to prepare a high-efficiency green-emitting Sc 3+ -doped Cs 2 NaTbCl 6 . The synthesized Cs 2 NaTbCl 6 and Sc 3+ -doped Cs 2 NaTbCl 6 perovskite crystals had similar crystal structures. Interestingly, Sc 3+ -doped Cs 2 NaTbCl 6 could improve the luminescence performance of Cs 2 NaTbCl 6 while maintaining the excitation-emission characteristics of Cs 2 NaTbCl 6 . After doping with Sc 3+ at a concentration of 0.05 mmol, the band gap of Cs 2 NaTbCl 6 became wider. When the doping amount of Sc 3+ reached 0.05 m mol, the photoluminescence emission intensity was increased by 31.33 % compared with Cs 2 NaTbCl 6 . The fluorescence lifetime became longer and the photoluminescence quantum yield reached 96.07 %. In this work, we further prepared light-emitting diodes and white light-emitting diodes with excellent performance using Sc 3+ -doped Cs 2 NaTbCl 6 . In addition, Sc 3+ -doped Cs 2 NaTbCl 6 and aramid chopped fibers/polyphenylene sulfide were combined to prepare the composite paper. The functional composite fiber paper had excellent photostability in a variety of extreme environments. The potential application value of Sc 3+ -doped Cs 2 NaTbCl 6 double perovskite in daily lighting, color display, fluorescent anti-counterfeiting, functional fibers, and optoelectronic devices was demonstrated.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2023
·
IF 3.2
Jinghe Bai,Defeng Zhou,Leilei Niu,Ruyi Chen,Xiaofei Zhu,Ning Wang,Qingwen Liang,Wenfu Yan
The development of cathode materials with high oxygen reduction reaction (ORR) activity and stability in intermediate temperature (IT) environments is a key factor in the commercialization of solid oxide fuel cells (SOFC). In this paper, the ORR activity of the cathode is improved by doping high-valent Sc 3+ ions at the B-site of the Sr 0.5 La 0.5 Co 0.8 Cu 0.2-x Sc x O 3–δ (x = 0, 0.02, 0.04), in which Sr 0.5 La 0.5 Co 0.8 Cu 0.18 Sc 0.02 O 3–δ (SLCCS2) shows the best electrochemical performance , and the area-specific resistance of SLCCS2 at 700 °C is only 0.047 Ω cm 2 , much lower than the 0.087 Ω cm 2 of Sr 0.5 La 0.5 Co 0.8 Cu 0.2 O 3–δ (SLCC), and the peak power density of SLCCS2 reached 1.098 W cm −2 , which is 1.84 times that of SLCC (0.598 W cm −2 ). In addition, SLCCS2 effectively reduces the thermal expansion coefficient , improves thermal matching with traditional electrolytes, and overcomes the problem of insufficient long-term SOFC stability caused by the high thermal expansion coefficient of Co-based perovskite to a certain extent. SLCCS2 also exhibits excellent CO 2 tolerance. Considering comprehensively, SLCCS2 is expected to become an IT-SOFC cathode material with development potential.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
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2022
·
IF 4.632
Zhixiong Song,Shuwen Yu,Kaixian Wang,Zhengming Jiang,Liyan Xue,Fan Yang
In this work, a novel Sc-doped Bi 3 TiNbO 9 ferroelectric nanofiber was first prepared by electrospinning. The nanofibers are approximately 100 nm level in diameter. The photocatalytic activity analysis reveals that the Bi 3 TiNbO 9 nanofibers synthesized by electrospinning are superior to powders prepared by the solid-state method, which is mainly attributed to the high specific surface area and high surface activity of the nanofibers. In addition, doping Sc can reduce the band gap of Bi 3 TiNbO 9 and further improve the photocatalytic efficiency. Bi 3 TiNbO 9 nanofibers containing 5 mol% Sc have the highest photocatalytic activity, which can degrade 98.55% of RhB under 405 nm light irradiation for 120 min. In addition, the catalytic mechanism of the catalyst was obtained by scavenger tests, active species capture tests and band structure analyses. After three cycles of photocatalytic experiment, the degradation rate is decreased by only 2.42%, proving that the nanofibers catalyst has excellent stability. This work provides good prospects for the practical application of electrospinning technology in the field of photocatalysis.
研究领域:
材料科学
·
纳米技术
·
环境科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2025
·
IF 2.6
Nie Yujia,Qian Guangren,Chen Youdong,He Jia,Zhou Wei,Xiao Hanning
The proton ceramic fuel cell (PCFC) is a cutting-edge technology for achieving carbon-free and efficient energy conversion. It has garnered significant attention in the clean energy sector due to its environmental adaptability and fuel compatibility in the low to medium temperature range of 500 to 700 °C. The intrinsic properties of cathode materials significantly affect the electrochemical performance of PCFC. In this study, a novel Sc-doped La 0.6 Sr 0.4 CoO 3−δ cathode was designed and synthesized using the sol–gel method, and its electrochemical performance in the PCFC was systematically investigated. Test results under hydrogen fuel conditions demonstrated that the single cell using the La 0.6 Sr 0.4 Sc 0.4 Co 0.6 O 3−δ cathode exhibited a respectable power output capability at 700 °C, achieving a peak power density (PPD) of 556 mW cm −2 and polarization impedance of 0.217 Ω cm 2 . Notably, the cell exhibited a performance degradation rate as low as 0.013% h −1 after 100 h of operation at a constant current discharge of 342 mA cm −2 , with the open-circuit voltage and PPD maintaining 98.5% and 107% of their initial values, respectively. This study provides valuable reference for the design of perovskite cathodes for PCFC.
研究领域:
能源技术
·
材料科学
·
电化学
·
陶瓷工程
✓ 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）