Materials Today Chemistry
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2024
·
IF 6.7
Yifei Chen,Zhihui Qian,Qin Zhu,Ling Xia,Wei Bai,Mingwu Xiang,Yujiao Guo,Shulei Chou,Ping Ning,Junming Guo
Rapid capacity fade of spinel LiMn 2 O 4 cathode material limits the application of lithium-ion batteries. Herein, the introduction of La/B elements achieves the dual-modification of surface coating and single-crystal truncated morphology, ensuring the compatibility of rate capability and cycling stability. The La and B introduction enables the in situ formation of LaBO 3 coating layer. Both the LaBO 3 coating and truncated morphology prevent the direct exposure of the cathode to the electrolyte, decreasing the Mn dissolution and providing the additional Li + diffusion channels. The increase of La and B modification partially restrains the development of {110} crystal planes. The refinement manifests that the La 3+ /B 3+ doping partially replaces Mn 3+ of the LiMn 2 O 4 , inhibiting the Jahn-Teller effect and stabilizing the [MnO 6 ] skeleton. Consequently, the optimized LiMn 2 O 4 @0.04LaBO 3 with the favorable LaBO 3 coating thickness and two truncated octahedrons exhibits the excellent electrochemical properties at high current rate. The first discharge capacities of 109.1, 104.2 and 96.9 mAh⋅g −1 are obtained, whilst the capacity retentions of 64.8 % (after 2000 cycles), 65.8 % (after 2000 cycles) and 80.5 % (after 1000 cycles) can be maintained at 5 C, 10 C and 20 C, respectively. Even at 5 C and 55 °C, the high initial discharge capacity of 113.6 mAh⋅g −1 and good cycling lifespans can be achieved. This modification strategy provides valuable insight for preparing the advanced LiMn 2 O 4 cathode materials for lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Photonics and Nanostructures-Fundamentals and Applications
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2018
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IF 1.575
Xiaofeng Wei,Jiaqi Pan,Jie Mei,Yingying Zheng,Can Cui,Chaorong Li
The orderly nano array is able to improve the light utilization efficiency and has been thought to be a promising way for advancing photocatalysis. The orderly nano array of truncated octahedra Cu 2 O nanocrystals have been successfully fabricated by the facile solution-based one-step reduction and self-assembly method. The results of XRD, SEM and TEM indicate that the Cu 2 O nano array is successfully assembled on the Si substrate. The photocatalytic activity of the Cu 2 O orderly nano array is investigated under visible light irradiation, and it is demonstrated to be significantly enhanced after the Cu 2 O is self-assembled orderly. Furthermore, the surface orderly structure of the nano array is considered as the main reason for the enhancement.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 36
·15492-15497
·
IF 3.288
Hongjing Wang,Songliang Liu,Hugang Zhang,Shuli Yin,You Xu,Xiaonian Li,Ziqiang Wang,Liang Wang
The regulation of the morphology and the composition of Pt-based materials is a promising strategy to improve their catalytic performance for the methanol oxidation reaction (MOR). In this work, we report the preparation of multinary PtPdNiP truncated octahedral mesoporous nanocages (PtPdNiP TOMNs) with a well-defined structure. Benefitting from their porous outer surface, hollow structure, and compositional effect, the as-obtained PtPdNiP TOMNs exhibit excellent catalytic activity and durability in the MOR. This work would provide a promising route for the rational design and development of metal–nonmetal nanomaterials with an improved performance in fuel cells and other applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Horizons
·
2021
·Vol. 6
·期 3
·238-244
·
IF 10.989
Wenjuan Liu,Xiao Chen,Xiaoyong Ding,Qiang Long,Xiaolong Lu,Qiang Wang,Zhongwei Gu
The controllable synthesis and customized design of micro/nanomotors represents a highly desired paradigm in the field of intelligent nanovehicles. Exploiting asymmetrical structures and geometry-dependent propulsion are the two main strategies for achieving light-driven micro/nanomotors. However, inherent crystal-structure differences in a single colloidal motor have rarely been explored. Here, we propose the first surface-heterojunction-induced propulsion methodology for cuprous oxide (Cu2O) nanomotors, by tailoring the crystal morphology of a Cu2O crystalloid from a sphere into a truncated octahedron and preserving the controllable-index crystal facets of {100} and {111} in a single colloid. Due to the high crystallinity and distinct activity of the exposed crystal facets, a surface heterojunction between the {100} and {111} facets is formed to enhance electron–hole separation, as confirmed by density functional theory (DFT) calculations, thus endowing the truncated octahedral Cu2O nanomotors with autonomous and vigorous movement in biocompatible fuels under visible light. These Cu2O nanomotors can reach a propulsion speed in water of over two times faster than that of polycrystalline spherical motors with low crystallinity. The efficient Cu2O nanomotors offer a promising guideline not only for the synthesis of novel light-driven motors with desired structures, but also for potential applications in biocompatible environments.
研究领域:
纳米技术
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材料科学
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化学工程
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Qiannan Zhou,Wei Li,Mengyou Gao,Huizhong Xu,Yu Guo,Lei Sun,Dehua Zheng,Jianjian Lin
Metal-organic frameworks (MOFs), as 3D porous precursors, have demonstrated great potential as electrode materials for lithium storage on account of high specific area and tunable structure. To enhance the intrinsic performance and endow MOFs with versatility, constructing distinctive morphology of MOFs while maintaining their porous structure to satisfy various application is highly desirable. Herein, we successfully developed a facile strategy for rationally designing and synthesizing the morphology of MOFs from circular plate shape to truncated octahedron gem shape via regulating the ratio of Pluronic F127 to terephthalic acid . In addition, the as-prepared Pluronic F127-regulated Ti-based MOFs (F-MIL-125-Ti) sacrifice as precursor to derive 3D mesoporous titanium dioxide (TiO 2 ) and as template for in situ growth of molybdenum disulfide (MoS 2 ) nanosheets to prepare a truncated octahedron TiO 2 @C@MoS 2 hierarchical composite. As expected, the distinctive 3D hierarchical TiO 2 @C@MoS 2 electrode exhibits superb rate capability (775 mAh g −1 at 5 C) and outstanding cycling stability (822 mAh g −1 after 1000 cycles at 1 C), which is benefiting from the 3D mesoporous TiO 2 and synergies between TiO 2 and MoS 2 nanosheets. This work develops new insight to design novel and controllable morphology MOFs-derived materials for application of energy storage devices.
研究领域:
材料科学
·
能量存储
·
纳米技术
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2024
·Vol. 43
·期 5
·2026-2038
·
IF 9.6
Xu Bin,Jia Lu,Yang Hui,Wang Yue,Fan Si-Yu,Yuan Sai-Sai,Zhang Qi-Tao,Zhang Ming,Ohno Teruhisa
In this study, the truncated octahedral CeO 2 (CeO 2 -to) with special morphology was prepared by the solvothermal method with oleic acid (OA) and oleamine (OM) as the morphology-directing agents. High-resolution transmission electron microscopy (HRTEM) results show that CeO 2 -to exposes composite {100} and {111} facets, while CeO 2 cubic (CeO 2 -c) and CeO 2 octahedral (CeO 2 -o) only expose single crystal facets of {100} plane and {111} plane, respectively. Interestingly, this CeO 2 -to photocatalyst exhibits remarkable photooxidation performance of gaseous acetaldehyde (CH 3 CHO) degradation, in which CO 2 generation value reaches 1.78 and 7.97-times greater than that of CeO 2 -c and CeO 2 -o, respectively. In addition, the active species trapping experiment signifies that superoxide (·O 2 − ) and holes (h + ) are the main reactive substances during the CH 3 CHO degradation process, and the electron paramagnetic resonance (EPR) spectra indicates that the former is the major contributor. Notably, the electron transfer mechanism between CeO 2 -to {100} and {111} facets and the surface oxygen adsorption ability are revealed via density functional theory (DFT) calculations. It is also confirmed that {100} facets are more conducive to the absorption of acetaldehyde than {111} facets. Finally, a reasonable mechanism for improved photocatalytic CH 3 CHO degradation on CeO 2 -to is proposed based on relevant experiments and DFT calculations. This study demonstrates that the systematic development of surface homojunction structured photocatalysts can efficiently increase the degradation activity for volatile organic compounds (VOCs). It also offers additional direction for optimizing the photocatalytic activity of other cerium-based photocatalysts. Graphical abstract
研究领域:
材料科学
·
环境科学
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纳米技术
·
物理化学
·
催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）