JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yanhua Zhang,Dongwei Hu,Jiadong Deng,Fei Chen,Qiang Shen,Aikui Li,Lianmeng Zhang,Shijie Dong
Li + transport channel size of garnet-type Li 7 La 3 Z 2 O 12 (LLZO) solid electrolytes is continuously regulated to study its governing of Li + migration in application of all-solid-state batteries. Results show that the Li + migration activation energy decrease with the decrease of Li + transport channel size and then increase with further decrease of Li + transport channel size. With Li + transport channel size of 12.954 Å, the Li + migration activation energy reaches minimum of 0.28 eV. The cyclic voltammogram of Au/Li 7 La 3-X Ca X Zr 2-Y Ta Y O 12 /Li cells show that, with Li + transport channel size of 12.954 Å, the redox peaks is at ±0.23 V, which is more symmetrical and closer to 0 V compared to both larger and smaller Li + transport channel size of 12.961 Å (0.38 V and −0.32 V) and 12.935 Å (0.50 V and −0.40 V). This suggests that LLZO with Li + transport channel size of 12.954 Å has better charge-discharge reversibility of lithium deposition and dissolution and less energy consumption when used as solid electrolyte in all-solid-state lithium batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Chuang Li,Li Fan,Runzhi Zhu,Xin Li,Piao Wen,Xiaowen Zhao,Gang Wang,Jianli Zou,Franklin Kim
Solar steam generation has attracted interest in recent years as a clean source for power generation and water treatment. To achieve a high rate of steam generation, it is important for the solar evaporator to not only have high photothermal conversion efficiency but also have a large effective surface area for water evaporation. Herein, we report the use of PVA-based composite hydrogels as the solar evaporator, which inner channel sizes were adjusted through an ice-templating method. Although PVA hydrogels have been actively pursued as a promising material for solar steam generation, the influence of inner channel sizes to material performance has not yet been well investigated. Up to this point, the inner channel sizes of most reported PVA-based solar evaporators have been in the range of several to a few tens of micrometers. In this study, we have narrowed the channel size down to submicrometer range by suppressing growth of ice crystals while freezing the hydrogels. Strong capillary force induced by the narrow channels facilitated transport of water over long distances. Therefore, even when the hydrogel was molded into a pillar structure with length of several centimeters, water could be rapidly transported from one end to another, allowing effective evaporation at much increased heights compared to hydrogels with larger channel sizes. The increase in surface area for water evaporation led to a steam generation rate of 6.35 kg m–2 h–1 per water surface area covered by the evaporator under 1 sun illumination (100 mW cm–2), which is significantly higher than previously reported values.
研究领域:
材料科学
·
能源研究
✓ 已验证
DOI
高影响因子
SOLAR ENERGY
·
2020
·
IF 4.608
Xuechen Liang,Xinjie Zhang,Qichen Huang,Han Zhang,Changkun Liu,Yizhen Liu
Solar interfacial evaporation is a promising technology for the purification of seawater and polluted water using sustainable solar energy. An adjustable shape and internal-channel size of photothermal evaporation material are essential for regulating heat utilization and water supply rate to three-dimensional (3D) evaporation device. However, a simple method for the preparation process is rarely reported to date. Inspired by bread making, a straightforward fermentation method is applied to the preparation of adjustable porous hydrogel as photothermal evaporation materials. It only takes 40 min to ferment and three simple freeze-thawing cycles to construct the final hydrogel materials. A mold can be used to easily adjust the external shape of the fermentation porous hydrogels (FPHs). The internal-channel size of FPHs can be simply tuned by the fermentation time. The flexible porous structure endows FPHs with excellent photothermal evaporation capability and makes it easy to meet the requirements of water supply rates under the light intensity of different latitudes for water treatment.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
BioEnergy Research
·
2014
·Vol. 7
·期 4
·1541-1549
·
IF 3.398
Zhang Haidong,Zou Yu,Shen Yu,Gao Xue,Zheng Xuxu,Zhang Xianming,Chen Youpeng,Guo Jinsong
Three mesoporous silica materials with various channel sizes and structures were employed to prepare immobilized lipase catalysts for the transesterification of unrefined wasted cooking oil (UWCO) to biodiesel at room temperature. The channel size of support material was found to be the key point to obtain high initial specific activity and high sustainability of activity of the immobilized lipase catalysts. A SBA-15 material with appropriate channel size (14.0 nm) demonstrates the best capacity of lipase. The immobilized catalyst with the SBA-15 material shows much higher activity and sustainability of activity than the immobilized catalysts with a MCM-41 material (channel size 1.8 nm) and a mesostructured cellular foam (MCF) material (channel size 28.0 nm) as support materials in the transformation of UWCO to biodiesel. After 60 h of reaction at 28 °C, a fatty acid methyl ester (FAME) yield up to 80.1 and 71.8 % of initial specific activity can be achieved using SBA-15-immobilized lipase.
研究领域:
生物化学
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yanhua Zhang,Jiadong Deng,Dongwei Hu,Fei Chen,Qiang Shen,Lianmeng Zhang,Shijie Dong
The Li + concentration and Li + transport channel size of garnet-type solid electrolyte Li 7 La 3 Zr 2 O 12 are the two key factors associated with the improvement of Li ionic conductivity . Through precise control of the Li + concentration and the Li + transport channel size by Ta-doping (Li 7-X La 3 Zr 2-X Ta X O 12 , X = 0.2–1.0), synergistic regulation of the two factors is achieved. Results show that the optimum Li + concentration seems to be at about 6.31 where the Li + occupancy in LiO 6 is high and the Li + arrangement in LiO 4 is disordering. With the Li + concentration higher than 6.31, the occupancy in LiO 4 sites remains constant but the Li + arrangement in LiO 4 becomes more and more ordering. At higher Li + concentration of 6.52, Li + arrangement becomes certain of ordering which should have reduced the grain conductivity, however, the grain conductivity is still as high as 9.84 × 10 −4 S cm −1 . This indicates that LLZO with this Li + concentration have favorable Li + transport channel size. The optimum Li + transport channel size is about 12.95 ± 0.01 Å. At Li + concentration of 6.31, the proper Li + concentration is the main factor for the high grain ionic conductivity of 10.1 × 10 −4 S cm −1 . While at Li + concentration of 6.52, the suitable Li + transport channel size is the main factor for the high grain ionic conductivity. In conclusion, the high grain ionic conductivity at Li + concentration of 6.31–6.52 is due to the synergistic regulation of Li + concentration and Li + transport channel size.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）