Greenhouse Gases-Science and Technology
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2025
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IF 2.8
Ziyong Li,Qingdan Huang,Tingyan Wang,Huihong Huang,Haoyong Song
The amino groups and its substituents of organic amine absorbents have an important influence on the CO 2 absorption and desorption performance. In this study, four diamines with the same primary amino group and another different amino groups were selected as absorbents, including 1,3-propanediamine (1,3-PDA), 3-methylaminopropylamine (MAPA), 3-dimethylaminopropylamine (DMAPA), and 3-diethylaminopropylamine (DEAPA). The phase-change absorption system uses a mixture of polyether and H 2 O as the solvent. The CO 2 absorption performance of flue gas was studied with the analysis on absorption and desorption rate, cycle capacity, and desorption ratio. The effect of diamine molecular structures on phase-change CO 2 capture was investigated by nuclear magnetic carbon spectroscopy. The results show that DEAPA exhibits highest absorption capacity of 1.21 mol CO 2 /mol amine and recycling capacity of 1.09 mol CO 2 /mol amine. The absorption rate of primary and secondary diamines in the phase-change system is significantly higher than that of primary and tertiary diamines. The diamine system with tertiary amino groups has significantly faster desorption rate, higher desorption ratio, and cycle capacity than the primary and secondary diamine systems. The intramolecular tertiary amino group is more conducive to promoting the absorption of CO 2 than the intermolecular tertiary amino group, which can increase the absorption rate of CO 2 by the primary amino group and enhance the CO 2 desorption.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
Tungsten
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2024
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IF 5.6
Chen Hao,Wang Ya-Qin,Zhang Dong-Ting,Zhao Bei,Li Min-Peng,Li Chen-Yang,Xu Tian-Peng,Liu Mao-Cheng
MXenes obtained significant attention in the field of energy storage devices due to their characteristic layered structure, modifiable surface functional groups, large electrochemically active surface, and regulable interlayer spacing. Nonetheless, the self-restacking and sluggish ions diffusion kinetics performance of MXenes during the alkali metal ions insertion/extraction process severely impedes their cycle stability and rate capability. This paper proposes an aniline molecule welding strategy for welding p-phenylenediamine (PPDA) into the interlayers of Ti 2 C through a dehydration condensation reaction. The welded PPDA molecules can contribute pillar effect to the layered structure of Ti 2 C. The pillar effect effectively maintains the structural stability during the sodium ions insertion/extraction process and effectively expands the interlayer spacing of Ti 2 C from 1.16 to 1.38 nm, thereby enhancing ions diffusion kinetics performance and improving the long-term cycle stability. The Ti 2 C-PPDA demonstrates outstanding Na + storage capability, exhibiting a specific capacity of 100.2 mAh·g −1 at a current density of 0.1 A·g −1 over 960 cycles and delivering a remarkable rate capability 81.2 mAh·g −1 at a current density of 5 A·g −1 . The study demonstrates that expanding interlayer spacing is a promising strategy to enhance the Na + storage capacity and improve long-term cycling stability, which provides significant guidance for the design of two-dimensional Na + storage materials with high-rate capability and cycle stability.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
Energy Storage Materials
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2020
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IF 16.28
Yu-Shan Zhang,Bin-Mei Zhang,Yu-Xia Hu,Jun Li,Chun Lu,Ming-Jin Liu,Kuangye Wang,Ling-Bin Kong,Chen-Zi Zhao,Wen-Jun Niu,Wen-Wu Liu,Kun Zhao,Mao-Cheng Liu,Yu-Lun Chueh
Graphite has been commercialized as a material of lithium ions batteries because of its abundant source, low cost and excellent conductivity while the small interlayer spacing of graphite limits its application for Na + insertion/extraction. Herein, an emerging and effective approach—chain-like H 2 N(CH 2 ) x NH 2 locked between graphene oxide (GO) sheets to expand the interlayer spacing of graphene with enhanced stability of layered structure was demonstrated by a dehydration condensation reaction . The as-obtained H 2 N(CH 2 ) x NH 2 , which can link GO (xDM-GO), exhibits a lock-link structure, resulting in expanded interlayer spacing, with which the excellent Na + storage performance with a high specific discharge capacity of 158.1 mAh g −1 at 0.1 A g −1 and outstanding capacity retention of 82.2% at a current density of 1 A g −1 can be achieved. The effects of interlayer spacing on Na + diffusion coefficient and the rate capability were investigated, for which 0.95 nm is the most suitable interlayer spacing for the Na + insertion/extraction. The novel strategy demonstrates an effective way to controllably tune the interlayer spacing with the improved structure stability of GO, resulting in the best Na + insertion/extraction behavior with the excellent Na + storage performance.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Shuai Zhang,Hongli Liu,Xianggao Li,Shirong Wang
Inorganic perovskite quantum dots (QDs) have emerged as promising materials for light-emitting devices by merits of their high photoluminescence quantum yield (PLQY), narrow full width at half-maximum and tunable emission spectrum. However, fluorescence quenching and trap-mediated nonradiative recombination between hole transport layer (HTL) and QD films are prejudicial to the performance of perovskite-QDs-based light-emitting devices (QLEDs). Here, HTL was modified with diamine molecules (1,4-butanediamine (4-DA), 1,8-octyldiamine (8-DA) and 1,11-aminoundecylamine (11-DA)) through a simple self-assembly method. QD films based on modified poly[ N , N ′-bis(4-butylphenyl)- N , N ′-bis(phenyl)-benzidine] (Poly-TPD) exhibited higher PL intensity and lower fluorescence quenching properties. Meanwhile, diamine molecules do favor to the flatness of Poly-TPD film and contribute to the smoothness of QD films. Moreover, the exciton quenching and the density of defects at the interface between HTL and QD films were effectively reduced. Particularly, QLEDs based on HTL modified with 8-DA was endowed with a maximum luminance of 78634 cd/m 2 , a peak current efficiency of 30.77 cd/A, a maximum external quantum efficiency of 8.90% and T 50 of 16.8 min when the initial brightness is about 1000 cd/m 2 .
研究领域:
材料科学
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光电技术
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产品关联
DOI
高影响因子
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