Materials Today Communications
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2024
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IF 3.7
Tingting Zhang,Ning Xu,Wang Yin,Dongli Liu,Chang Liu,Meidong Lang
Polydicyclopentadiene (PDCPD) was attractive in marine, automotive and new energy fields, but limited by its lower rigidity . Herein, poly(dicyclopentadiene- co -tricyclopentadiene) (poly(DCPD- co -TCPD)), was prepared by rapid and energy-efficient frontal polymerization (FP). The flexural properties of copolymers prepared via FP were comparable to those prepared by long-term oven curing. Furthermore, the study explored the cis-trans isomerization of double bond , molecular weight between cross-links, density, swelling degree and monomer conversion to systematically analyze the influence of tricyclopentadiene (TCPD) incorporation. Notably, the selected comonomer TCPD was relatively simple in synthesis, and its incorporation resulted in remarkable enhancement of the thermomechanical properties and acid-base resistance of neat PDCPD. At an 80 wt% TCPD incorporation, the flexural modulus increased significantly from 1865 MPa to 2703 MPa, and the T g elevated from 147 ℃ to 210 ℃. Compared to other widely used thermosets , poly(DCPD- co -TCPD) exhibited significant advantages in terms of being lightweight and heat-resistant. The resulting thermosets demonstrated considerable potential for applications as high-performance thermosets and in composites with adjustable thermomechanical properties .
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Yilin Wang,Yunmei Du,Ziqi Fu,Mengmeng Wang,Yunlei Fu,Bin Li,Lei Wang
Currently, there are still many limitations in the research of conductive metal-organic frameworks (MOFs) in the field of electrocatalysis . On the one hand, most MOFs have a solid construction, seriously hindering their mass transfer process. On the other hand, innate bonding is not conducive to the optimization of electronic structures and the excitation of intrinsic active sites. Therefore, external/internal dual-control of MOFs is urgently needed to break the shackles of their activity. Herein, the hollow RuCoCu-MOF/CF nanorods with tunable cavities are directionally constructed by a self-sacrificial template method. Benefiting from the exact morphological control and the unique Ru–O–Co bond bridge, RuCoCu-MOF/CF exhibits superior performances for alkaline hydrogen evolution reaction (HER) and urea oxidation reaction (UOR). Surprisingly, a record-breaking voltage of 1.402 V drives a current density of 10 mA cm −2 for urea-assisted overall water splitting under alkaline conditions, greatly promoting the development of energy-efficient hydrogen production technology. This work firstly constructed the MOF-based self-supporting electrode with ultra-high urea-assisted hydrogen production and urea degradation performances via the dual controls of the cavity size and chemical bond bridge. This points out the direction for the development of unique integrated electrodes for both hydrogen production and decontamination .
研究领域:
材料科学
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电催化
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Energy
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2017
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IF 0
Jianmei Wang,Xiao Ma,Tingting Liu,Danni Liu,Shuai Hao,Gu Du,Rongmei Kong,Abdullah M. Asiri,Xuping Sun
The sluggish kinetics of water oxidation has severely hindered the energetic convenience of electrochemical water splitting. In this work, we describe our recent finding that NiS 2 nanosheet array on Ti mesh (NiS 2 /TiM) is a superior catalyst for hydrazine oxidation reaction (HzOR) with the demand of potential of 218 mV to drive 300 mA cm −2 in 1.0 M KOH with 0.5 M hydrazine. Interestingly, its high activity toward hydrogen evolution reaction enables it as a bifunctional catalyst for energy-efficient electrolytic hydrogen generation, and the two-electrode alkaline electrolyzer using NiS 2 /TiM as both anode for HzOR and cathode for HER needs a cell voltage of only 0.59 V to attain 50 mA cm −2 , 1.34 V less compared with pure water splitting to achieve the same current density, promising the use of such 3D catalyst electrode toward energy-saving electrochemical production of hydrogen fuels .
研究领域:
材料科学
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能源化学
✓ 已验证
DOI
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Xiaobin Zhou,Dan Wang,Zhuo Wang,Zongqiang Zhu,Yinming Fan,Dunqiu Wang,Bihong Lv,Shengpeng Mo,Yanan Zhang,Yinian Zhu,Guohua Jing
Secondary amines are highly suitable candidates for constructing non-aqueous phase change absorbents (PCAs) that boast low viscosity and regeneration heat. However, the secondary amine-based PCAs often encounter the challenge of inadequate phase separation. This study proposed an innovative strategy of tailoring the polarity of absorption products to facilitate the controllable phase transition of the secondary amine-based PCA. Specifically, using aminoethylethanolamine (AEEA) as a regulator of product polarity to endow the 2-(ethylamino)ethanol (EAE)/pentamethyldiethylenetriamine (PMDETA)/dimethyl sulfoxide (DMSO) non-aqueous absorbent with tunable liquid–liquid phase transition behavior. The AEEA/EAE/PMDETA/DMSO (A/E/P/D) PCA realized a high CO 2 loading of 0.77 mol·mol −1 , with over 92% of the absorbed CO 2 being enriched in the CO 2 -rich phase, which exhibited a low viscosity of 13.83 mPa·s. The A/E/P/D PCA also possessed good reusability, maintaining a cyclic loading of 0.65 mol·mol −1 even after five absorption–desorption cycles. Analysis of the phase change mechanism indicated that AEEA reacted with CO 2 to form highly polar AEEA-derived products, which played a pivotal role in driving the phase transition of the A/E/P/D system. In brief, the AEEA-derived product easily combined with polar DMSO , creating a “polar sink” that continually attracted the medium-polar EAE-derived products. Consequently, these products clustered together to form the CO 2 -rich phase with less polar PMDETA being isolated to form the CO 2 -lean phase. Moreover, estimation of the regeneration heat demonstrated that the combined sensible heat and latent heat of A/E/P/D amounted to 0.32 GJ·ton −1 CO 2 , representing a significant reduction of 84% compared to 30 wt% MEA. This study provided a novel idea to manipulate the phase behavior of PCAs and offered a promising A/E/P/D PCA for energy-efficient CO 2 capture.
研究领域:
化学工程
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环境科学
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量子化学
✓ 已验证
产品关联
DOI
高影响因子
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