APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Zong Li,Kaili Ni,Yifei Wang,Yuan Rui,Miaohui Wang,Haiping Lin,Peipei Huang,Qing Li
Achieving high activity and selectivity for multi-carbon (C 2+ ) products on copper-based catalysts at ampere-level current densities is important for advancing industrial electrochemical CO 2 reduction reaction (eCO 2 RR). However, oxidative copper species are prone to reduction to metallic copper at high reduction potentials, causing the decline of selectivity and stability for C 2+ products. Herein, we report that Cucurbit[6]uril (CB[6])-modified copper nanoparticles promote eCO 2 RR via stabilizing Cu + sites at ampere-level current densities. The Cu-CB[6]-3 catalyst exhibited the highest C 2+ productivity with a faradaic efficiency of 72.2 ± 1.0 % at a current density of 1.0 A cm −2 , and the corresponding potential was −1.2 V vs. RHE. Detailed systematical spectroscopic analyses revealed that the main reason for boosting the C–C coupling is that the strong coordination interaction and molecular-level confinement of CO 2 and reaction intermediates of CB[6] can not only stabilize Cu + at higher current densities, but also accelerate the reaction kinetics. Simultaneously, the hydrophobic inner cavity and hydrophilic outer surface of CB[6] molecules ensure the smooth progress of eCO 2 RR while suppressing the hydrogen evolution reaction, resulting in high C 2+ selectivity and long-term stability. This work provides an approach to design highly efficient catalysts for industrial eCO 2 RR.
研究领域:
催化
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电化学
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材料科学
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化学工程
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纳米技术
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产品关联
DOI
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
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2024
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IF 6.7
Liu Weihao,Liu Qingtao,Wan Xin,Shui Jianglan
Non-precious metal electrocatalysts (such as Fe–N–C materials) for the oxygen (O 2 ) reduction reaction demand a high catalyst loading in fuel cell devices to achieve workable performance. However, the extremely low solubility of O 2 in water creates severe mass transport resistance in the thick catalyst layer of Fe–N–C catalysts. Here, we introduce silicalite-1 nanocrystals with hydrophobic cavities as sustainable O 2 reservoirs to overcome the mass transport issue of Fe–N–C catalysts. The extra O 2 supply to the adjacent catalysts significantly alleviated the negative effects of the severe mass transport resistance. The hybrid catalyst (Fe–N–C@silicalite-1) achieved a higher limiting current density than Fe–N–C in the half-cell test. In the H 2 –O 2 and H 2 –air proton exchange membrane fuel cells, Fe–N–C@silicalite-1 exhibited a 16.3% and 20.2% increase in peak power density compared with Fe–N–C, respectively. The O 2 -concentrating additive provides an effective approach for improving the mass transport imposed by the low solubility of O 2 in water.
研究领域:
材料科学
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电化学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
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2025
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IF 9.8
Changyue Deng,Tao Sheng,Hui Zhu,Yujie Wu,Sanxu Shi,Yibin Zhou
Large-ring cyclodextrins (LR-CDs) have excellent water solubility and large hydrophobic cavity, yet little is known about the encapsulation properties of LR-CDs as novel encapsulants for aroma molecules. In this study, LR-CDs were used to encapsulate eight aroma molecules, and the resulting inclusion complexes were investigated using FTIR, NMR, XRD, and molecular dynamics (MD) simulations. LR-CDs formed amorphous inclusion complexes, enhancing the dispersibility and thermal stability of the encapsulated aroma molecules. Compared to β-CD, LR-CDs possessed larger and more flexible cavity, showing higher encapsulation efficiency (59.7 %–72.9 %) for larger or more hydrophobic aroma molecules. MD simulations revealed stable conformations of the inclusion complexes. The entry of aroma molecules into the cavity was driven by hydrophobic interactions, while van der Waals forces and hydrogen bonding stabilized them within the cavity at different positions. This work highlights the encapsulation properties of LR-CDs and provides new insights into their potential applications in the food industry.
研究领域:
食品科学
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超分子化学
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包封技术
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分子模拟
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产品关联
DOI
PubMed
高影响因子
CHEMICAL PHYSICS
·
2019
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IF 1.822
Xin-Qi Zhou,Bao-Li Wang,Song-Bo Kou,Zhen-Yi Lin,Yan-Yue Lou,Kai-Li Zhou,Jie-Hua Shi
Intermolecular interaction of telmisartan (TMST), an angiotensin II receptor antagonist with bovine serum albumin was explored in vitro by the means of multi-spectral approaches such as UV absorption, stead-state fluorescence, synchronous fluorescence, 3-D fluorescence, and infrared spectroscopies in combination with theoretical calculation. The UV absorption and steady-state fluorescence studies manifested that BSA interacted with TMST leading to the fluorescence of both BSA and TMST were quenched through a static quenching manner. It can be found that a TMST-BSA complex with the stoichiometric ratio of 1:1 was formed and the binding constant ( K b ) was 7.26 × 10 3 M −1 at 298 K(close to 10 4 M −1 ), suggesting TMST was a moderate affinity on BSA, and its value diminished with the rising temperature, predicating the binding interaction of TMST with BSA was an exothermic reaction. The results from the competitive exploration and molecular modeling have confirmed that TMST primarily inserted into the hydrophobic cavity between sub-domain IIA and IIB of BSA. The calculated Δ H and Δ S values on the base of van't Hoff equation were −40.02 kJ·mol −1 and −60.46 J·mol −1 ·K −1 , meaning that hydrogen bonds and van der Waals force played dominating roles in the TMST–BSA system. The results of FT-IR spectra suggested that the alteration in the secondary structure of BSA like the decline in the contents of α-helix and β-sheets and the increase in the random coil. Meantime, the obvious variety in the configuration of TMST occurred after binding to fit the configuration of binding pocket.
研究领域:
生物化学
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生物物理
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药学
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分子生物学
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光谱学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
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2023
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IF 8.8
Luyao Chen,Xu He,Yijing Pu,Hongxuan Wang,Jiankang Cao,Weibo Jiang
A novel adsorbent β-cyclodextrin-modified pectin was synthesized for removing cholesterol and bile salts from the gastric-intestinal passage. Different amounts of β-cyclodextrin were cross-linked to pectin by aldol condensation reaction via glutaraldehyde. The prepared β-cyclodextrin-modified pectins were successfully confirmed by characterization, showing a higher specific surface area and improved thermal stability with satisfactory cellular compatibility. The introduction of β-cyclodextrins dramatically improved the cholesterol adsorption capacity of pectin due to their hydrophobic cavities. Meanwhile, the modified pectins exhibited superior adsorption for sodium cholate than β-cyclodextrin or pectin itself, which was attributed to hydrophobic interactions. P 10:1 displayed the strongest adsorption performance, with a maximum adsorption ability of 44.21 mg/g for cholesterol and 21.38 mg/g for sodium cholate. Furthermore, their adsorption favored the Langmuir isotherm model and pseudosecond-order kinetic model. These results indicate that modified pectin has potential as a nature-based adsorbent for removal of cholesterol and bile salts in the health food industry.
研究领域:
食品科学
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材料科学
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生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Nutrition
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2023
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IF 5
Wang Yin,Guo Yangkai,Zhang Longtao,Yuan Meilan,Zhao Li,Bai Chunqing,McClements David Julian
The objective of this work was to explore the possibility of improving the antioxidant capacity and application of whey protein (WP) through non-covalent interactions with hesperidin (HES), a citrus polyphenol with nutraceutical activity. The interaction mechanism was elucidated using several spectroscopic methods and molecular docking analysis. The antioxidant capacity of the WP-HES complexes was analyzed and compared to that of the proteins alone. Moreover, the resistance of oil-in-water emulsions formulated using the WP-HES complexes as antioxidant emulsifiers to changes in environmental conditions (pH, ion strength, and oxidant) was evaluated. Our results showed that HES was incorporated into a single hydrophobic cavity in the WP molecule, where it was mainly held by hydrophobic attractive forces. As a result, the microenvironments of the non-polar tyrosine and tryptophan residues in the protein molecules were altered after complexation. Moreover, the α-helix and β-sheet regions in the protein decreased after complexation, while the β-turn and random regions increased. The antioxidant capacity of the WP-HES complexes was greater than that of the proteins alone. Non-radiative energy transfer from WP to HES was detected during complex formation. Compared to WP alone, the WP-HES complexes produced emulsions with smaller mean droplet diameters, exhibited higher pH and salt stability, and had better oxidative stability. The magnitude of these effects increased as the HES concentration was increased. This research would supply valuable information on the nature of the interactions between WP and HES. Moreover, it may lead to the creation of dual-function antioxidant emulsifiers for application in emulsified food products.
研究领域:
食品科学
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化学
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营养学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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