Journal of Materials Chemistry A
·
2016
·Vol. 5
·期 9
·4359-4367
·
IF 8.262
Yong Li,Shuan Wang,Yan-Bing He,Linkai Tang,Yusuf Valentino Kaneti,Wei Lv,Zhiqun Lin,Baohua Li,Quan-Hong Yang,Feiyu Kang
Titanium oxide (TiO2) has attracted great interest as a promising anode material for lithium (Li) ion batteries (LIBs) and sodium (Na) ion batteries (SIBs). However, the key factors that dictate the Li-ion and Na-ion storage and transportation in TiO2 remain unclear. Herein, we report a facile hydrolysis route to crafting a variety of high tap-density TiO2 spheres with controllable size and hierarchical pores. The Li-ion and Na-ion storage properties based on these TiO2 spheres were systematically investigated. The pore distribution and the size of TiO2 spheres were found to exert profound influence on the Li-ion and Na-ion storage and transportation. The Li-ion storage and transportation in dense TiO2 spheres was dependent mainly upon the micropore distribution and volume and independent of the size of spheres. In contrast, the excellent Na-ion storage and transportation in TiO2 spheres was enabled by the loose structure with a large macroscopic pore volume and shortened Na-ion diffusion length. High tap-density TiO2 spheres (1.06 g cm−3) with superior Li-ion and Na-ion storage properties were produced, exhibiting a Li-ion storage specific capacity of 189 mA h g−1 at 1C and a high capacity retention of 88.1% after 100 cycles, and a Na-ion storage specific capacity of 184 mA h g−1 at 1C and capacity retention of 90.5% after 200 cycles. The ability to understand the critical factors controlling the Li-ion and Na-ion storage in high tap-density TiO2 spheres enables their implementation for practical applications in Li-ion and Na-ion batteries.
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
Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-17
·
IF 12.264
Ding Chenfeng,Liu Tianyi,Yan Xiaodong,Huang Lingbo,Ryu Seungkon,Lan Jinle,Yu Yunhua,Zhong Wei-Hong,Yang Xiaoping
An ultra-microporous carbon material simultaneously with high specific surface area (1554 m 2 g −1 ) and packing density (1.18 g cm −3 ) is designed and fabricated.
The resulting carbon material integrates the high gravimetric and volumetric capacitance (430 F g −1 and 507 F cm −3 at 0.5 A g −1 ) and thereof provides the robust all-solid-state cellulose supercapacitor with high areal and volumetric density.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2023
·
IF 17.1
Shiang Li,Ziqi Wang,Yuhao Li,Chun-Jen Su,Yuang Fu,Yi Wang,Xinhui Lu
Due to their versatile applications, perovskite quantum dot (PQD)-based optoelectrical devices have garnered significant research attention. However, the fundamental packing behavior of PQDs in thin films and its impact on the device performance remain relatively unexplored. Drawing inspiration from theoretical models concerning packing density with size mixtures, this study presents an effective strategy, namely, binary-disperse mixing, aimed at enhancing the packing density of PQD films. Comprehensive grazing-incidence small-angle X-ray characterization suggested that the PQD film consists of three phases: two monosize phases and one binary mixing phase. The volume fraction and population of the binary-size phase can be tuned by mixing an appropriate amount of large and small PQDs. Furthermore, we performed multi-length-scale all-atom and coarse-grained molecular dynamics simulations to elucidate the distribution and conformation of organic surface ligands, highlighting their influence on PQD packing. Notably, the mixing of two PQDs of different sizes promotes closer face-to-face contact. The densely packed binary-disperse film exhibited largely suppressed trap-assisted recombination, much longer carrier lifetime, and thereby improved power conversion efficiency. Hence, this study provides fundamental understanding of the packing mechanism of perovskite quantum dots and highlights the significance of packing density for PQD-based solar cells.
研究领域:
材料科学
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光电器件
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分子动力学模拟
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Crystals
·
2024
·Vol. 14
·期 3
·219
·
IF 2.4
Wang Wei,Yangguang Li,Ningning Tian,Tian Xie,Dengpan Nie,Hongyan Li,Hongdong Quan,Xiuguo Yang,Luqian Ye,Xiaohe Li,Kangli Li,Ye Gao
The crystal habit of pentaerythritol (PE) crystals is usually rod-shaped, which may lead to low bulk density and bad flowability compared with low aspect ratio crystals. In this study, dipentaerythritol (DPE), methylcellulose (MC), and hydroxypropyl methylcellulose (HPMC) were selected as additives to modify the morphology of PE crystals. In the presence of DPE, the bulk density of PE crystals was improved, and the aspect ratio was decreased. The modified attachment energy (AE) model was conducted to analyze changes in PE crystal habits in the presence of DPE, which characterizes the intensity of the interaction between DPE molecules and PE crystal faces. Spherical pentaerythritol crystals can be successfully prepared by adding MC and HPMC solution, and the formation mechanism can be divided into five steps.
研究领域:
材料科学
·
化学工程
·
晶体学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Xue Gao,Long Hu,Yuchen Mao,Zeming Zhong,Liangjun Huang,Kaisheng Xia,Hui Wang,Min Zhu
Porous carbon materials (PCMs) hold great promise as hydrogen storage materials due to their high capacity but are limited by adsorbing H2 at either cryogenic temperature or very high H2 pressure due to their weak van der Waals forces with the H2 molecules. In this study, N-doped hierarchical porous carbon (NHPC) materials were prepared by a simple one-step chemical activation method. Experimental results reveal that N-doping significantly enhances the interaction between H2 and the PCMs, which is demonstrated by increased adsorption isosteric heat (Qst) and H2 storage capacity per specific surface area (SSA). At lower H2 coverage, the Qst increases from 7.45 kJ/mol (NHPC-0) to 7.95 kJ/mol (NHPC-2 and NHPC-3), which aligns with the enhanced gravimetric H2 uptake per SSA. At higher H2 coverage (77 K, 50 bar-H2), there is a notable enhancement in the volumetric H2 uptake per SSA for NHPC-3 (11.41 g·L–1/m2·g–1) compared to that for NHPC-0 (8.49 g·L–1/m2·g–1) as the N content increases. Furthermore, N-doping can increase the packing density, thereby improving the volumetric H2 storage capacity of NHPC-x. The enhancement is strikingly demonstrated by NHPC-2, which achieves a volumetric H2 uptake of 26.96 g/L (SSA = 2458.44 m2/g) at 77 K and 50 bar. This is almost the same as that for NHPC-0, despite a 21% reduction in SSA, which is 26.47 g/L (SSA = 3116.58 m2/g) at the same condition. This work contributes to a deeper understanding of the effect of heteroatom doping on the H2 storage performance in PCMs.
研究领域:
材料科学
·
化学工程
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2025
·
IF 3.2
Liang Cai,Shurui Shang,Haifeng Xue,Xin Hu,Qiang Qi,Guangna Luo,Yingchun Zhang
Li 2 TiO 3 -Li 4 SiO 4 biphasic ceramic has attracted increasing attention because of its unique advantages for tritium breeding in fusion reaction. To overcome the critical limitations of conventional Li 2 TiO 3 -Li 4 SiO 4 pebbles, particularly their inadequate mechanical strength and low packing density, this work developed high-performance Li 2 TiO 3 -Li 4 SiO 4 cubic units via digital light processing (DLP). The purge gas flow behavior in stacked cubic unit structure was studied by Computational Fluid Dynamics (CFD) method to evaluate its structural characteristics. The photosensitivity and rheological properties of precursor suspension were studied to verify the printing feasibility. Solid loading and sintering process were optimized to yield the defect-free Li 2 TiO 3 -Li 4 SiO 4 cubic unit. The results show that the purge gas had periodic velocity distribution and extremely low pressure drop in the stacked cubic unit structure. Li 2 TiO 3 -Li 2 SiO 3 -Li 2 CO 3 ceramic suspension possessed suitable photosensitivity and thixotropy, and its optimal solid loading was 40 vol%. After sintering at 1100 °C, the Li 2 TiO 3 -Li 4 SiO 4 cubic unit with high relative density (92.8 %TD), high crush load (2000.3 N) and favorable open-pore structure can be prepared. Comparative analyses of Li-based cubic units indicate that the Li 2 TiO 3 -Li 4 SiO 4 cubic unit not only addresses the limitations of single-phase variants but also demonstrates superior intrinsic characteristics, including excellent mechanical& thermomechanical properties and distinct hydrogen isotope release behavior. This work proves the feasibility of Li 2 TiO 3 -Li 4 SiO 4 biphasic strategy and potential of Li 2 TiO 3 -Li 4 SiO 4 cubic units for the future tritium breeding design.
研究领域:
材料科学
·
核工程
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增材制造
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陶瓷材料
·
聚变能源
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2024
·
IF 11
Chenzhi Wang,Yan Li,Wei Xiong,Qiang Liang,Xin Hua,Pu Xuan,Wei Lin,Yingzheng Yao
The correlation between the structural parameters of droplets and rheological properties of O/W high internal phase Pickering emulsions (HIPPEs) stabilized by soy protein isolate (SPI) nanoparticles was elucidated, with a volume fraction of dispersed phase ( ϕ ) above the closest packing density (74%). The structural basis of SPI nanoparticles was confirmed to be spherical heat-induced protein aggregates, which had moderate wettability and excellent interfacial activity. The structural parameters of emulsion droplets (contact length L , diameter D , length d 1 , width d 2 , the number of adjacent contact droplets Z ), and the stability and rheological properties of HIPPEs were characterized by the confocal laser scanning microscopy (CLSM), diffusing wave spectroscopy (DWS), and mechanical rheometer respectively. The results of CLSM indicated the transition of droplets from spherical to polyhedral shapes as increased ϕ , accompanied by an increased L and Z . The rheological and stability analysis confirmed the widened linear viscoelastic range, elevated gel point ( ε c ), and the extended half−life of the intensity autocorrelation function of HIPPEs as ϕ increased. Moreover, the loss factor (tan δ ) remained constant at 0.1 within the ϕ of 74%–86%, revealing the solid−like nature of HIPPEs. The correlation between ϕ , structural parameters of droplets, and rheological properties of HIPPEs was further analyzed. The nonlinear regression fitting between the L / D and G ' (elastic modulus) yielded a better fitting effect than d 1 / d 2 and Z , suggesting an intrinsic correlation between emulsion structure and rheology. In summary, this study elucidated the intricate relationship between ϕ , droplet structure, and rheological properties of HIPPEs, offering a research foundation and theoretical basis for the development and application of protein particle−stabilized HIPPEs.
研究领域:
胶体科学
·
流变学
·
食品科学
·
材料科学
✓ 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）