ACS Nano
·
2025
·
IF 16
Yanhui Zhuang,Hao Yang,Yuhang Li,Yang Zhao,Huihua Min,Sheng Cui,Xiaodong Shen,Han-Yi Chen,Yifeng Wang,Jin Wang
Covalent organic frameworks (COFs) have shown promise as bifunctional catalysts to simultaneously mitigate shuttle effects and Li dendrite issues of lithium–sulfur (Li–S) batteries. However, the inherent low conductivity of the COFs has significantly limited their catalytic activity and stability. Herein, bifunctional catalytic activity and durability of the COF/MXene heterostructure are activated by tuning the surface curvatures of COFs interfaced with MXene. The increased curvature of COFs could induce enhanced electron delocalization and alter heterostructure geometry, which in turn strengthens lithium polysulfide adsorption, lowers energy barriers, and stabilizes catalytic sites to promote sulfur redox reactions. Concurrently, the hierarchical COF/MXene structure improves electrolyte penetration and wettability, facilitates rapid ion transport, and homogenizes the Li-ion flux distribution, thus achieving uniform lithium deposition. Consequently, the 1D-COF/MXene Li–S batteries demonstrate a high-rate capacity of 926 mA h g–1 at 4C, a stable cycling performance with a reversible capacity of 589 mA h g–1 at 3C after 500 cycles, and a high reversible capacity of 604 mA h cm–2 with a sulfur loading of 3.5 mg cm–2 under a low electrolyte-to-sulfur ratio of 10 μL mg–1. This work offers an efficacious approach to regulate catalytic activity and stability of catalysts.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2024
·
IF 5.6
Tao Gai,Jiaolai Jiang,Shaofei Wang,Ling Zhang,Yiming Ren,Zhen Qin,Qian Wu,Jun Zhang,Junsheng Liao
Uranium is an essential nuclear material in civilian and military areas; however, its extensive application raises concerns about the potential safety issues in the fields of environmental protection and nuclear industry. In this study, we developed an Ag/Ag 2 O–COF (covalent-organic framework) composite SERS substrate to detect uranyl ions (UO 2 2+ ) in environmental aqueous solutions. Herein, the strong SERS effect of uranyl adsorbed in Ag/Ag 2 O composite and the high adsorption efficiency of COF TpPa-1 were combined to realize the trace detection of uranyl ions. This method displayed a linear range of 10 −8 mol L −1 to 10 −6 mol L −1 with the detection limit of 8.9 × 10 −10 mol L −1 for uranyl ions. Furthermore, common metal cations and oxo-ions hardly affected the SERS detection of uranyl, which is helpful for the trace analysis of uranyl in natural water samples. Although the proposed strategy is deployed for uranyl detection, the reusable and high-efficiency system may be expanded to trace detection of other substance with Raman activity.
研究领域:
分析化学
·
环境科学
·
核科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Research
·
2021
·Vol. 14
·期 10
·3576-3584
·
IF 8.897
Wei Chuanliang,Wang Yusheng,Zhang Yuchan,Tan Liwen,Qian Yi,Tao Yuan,Xiong Shenglin,Feng Jinkui
Lithium metal (Li) is believed to be the ultimate anode for lithium-ion batteries (LIBs) owing to the advantages of high theoretical capacity, the lowest electrochemical potential, and light weight. Nevertheless, issues such as uncontrollable growth of Li dendrites, large volume changes, high chemical reactivity, and unstable solid electrolyte interphase (SEI) hinder its rapid development and practical application. Herein a stable and dendrite-free Li-metal anode is obtained by designing a flexible and freestanding MXene/COF framework for metallic Li. COF-LZU1 microspheres are distributed among the MXene film framework. Lithiophilic COF-LZU1 microspheres as nucleation seeds can promote uniform Li nucleation by homogenizing the Li + flux and lowering the nucleation barrier, finally resulting in dense and dendrite-free Li deposition. Under the regulation of the COF-LZU1 seeds, the Coulombic efficiency of the MXene/COF-LZU1 framework and electrochemical stability of corresponding symmetric cells are obviously enhanced. Li-S full cells with the modified Li-metal anode and sulfurized polyacrylonitrile (S@PAN) cathode also exhibited a superior electrochemical performance.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2014
·
IF 3.552
Juan Li,Xiaodan Yang,Chiyao Bai,Yin Tian,Bo Li,Shuang Zhang,Xiaoyu Yang,Songdong Ding,Chuanqin Xia,Xinyu Tan,Lijian Ma,Shoujian Li
A novel COF-based material (COF-COOH) containing large amounts of carboxylic groups was prepared for the first time by using a simple and effective one-step synthetic method, in which the cheap and commercially available raw materials, trimesoyl chloride and p -phenylenediamine, were used. The as-synthesized COF-COOH was modified with previously synthesized 2-(2,4-dihydroxyphenyl)-benzimidazole (HBI) by “grafting to” method, and a new solid-phase extractant (COF-HBI) with highly efficient sorption performance for uranium(VI) was consequently obtained. A series of characterizations demonstrated that COF-COOH and COF-HBI exhibited great thermostabilities and irradiation stabilities. Sorption behavior of the COF-based materials toward U(VI) was compared in simulated nuclear industrial effluent containing UO 2 2+ and 11 undesired ions, and the UO 2 2+ sorption amount of COF-HBI was 81 mg g −1 , accounting for approximately 58% of the total sorption amount, which was much higher than the sorption selectivity of COF-COOH to UO 2 2+ (39%). Batch sorption experiment results indicated that the uranium(VI) sorption on COF-HBI was a pH dependent, rapid (sorption equilibrium was reached in 30 min), endothermic and spontaneous process. In the most favorable conditions, the equilibrium sorption capacity of the adsorbent for uranium could reach 211 mg g −1 .
研究领域:
化学
·
环境科学
·
核能技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Tengfei Liu,Yuanshuang Liu,Dingrong Qu,Shougang Chen,Wenwu Chen,Lei Han,Zhigang Qiu,Linqi Zhu,Mindong Chen
COF LZU-1 has the characteristics of a porous structure, a large specific surface area , and good chemical stability. In recent decades, extensive research has been conducted on its use as a nanomaterial for drug loading and separation. Here, we report a new corrosion inhibitor encapsulated nanostructure (LZU-1 @BTA). We synthesized LZU-1 via a hydrothermal method and loaded benzotriazole (BTA) corrosion inhibitor into LZU-1. The results show that loaded BTA can achieve effective pH-responsive release under acidic and alkaline conditions. The amino group present in the LZU-1 molecule can cross-link with epoxy resin , and its compatibility allows for good dispersion in epoxy resin without any further modification. The LZU-1 @BTA modified epoxy coating has shown remarkable anti-corrosion properties and excellent self-healing capabilities, which have been evaluated through various techniques such as potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), local electrochemical impedance spectroscopy (LEIS), scanning Kelvin probe (SKP) and salt spray testing. The high-quality dispersion of LZU-1 @BTA in the resin, the high cross-linking density, and the pH-responsive release of BTA in the epoxy resin are some of the key factors that contribute to the excellent anti-corrosion performance of the epoxy resin composite coating . This research has opened up new possibilities for designing anti-corrosion coatings with significantly better corrosion resistance .
研究领域:
材料科学
·
腐蚀防护工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 22
·2111594
·
IF 19.924
Mengting Di,Xiaojun Sun,Lei Hu,Li Gao,Jie Liu,Xiaoming Yan,Xuemei Wu,Xiaobin Jiang,Gaohong He
Covalent organic frameworks (COFs) have permanent, nanometer-scale pores endowed with high porosity and thermal and chemical stability, which is widely used as composite membranes and applied in the field of separation. Conventional methods for preparing composite membranes, such as spray coating, spin coating, and pressure-assisted or vacuum-assisted filtration, have problems such as the selective layer can easily fall off. Here, an integrated casting–precipitation–evaporation method is proposed to prepare flexible COF composite membranes (DPBI/HTpBD). The DPBI/HTpBD composite membranes constructed with hollow spherical shell COF selective layer (HTpBD) and porous supporting layer are designed and applied in a vanadium flow battery. The excellent coulombic efficiency (CE, 99.5%) and voltage efficiency (VE, 81.1%) of batteries (180 mA cm −2 ) are achieved by the nanometre-scale pores of the hollow spherical shell COF selective layer. In addition, the rigid pore structure inside COF bonded by covalent bonds endows the DPBI/HTpBD composite membranes with outstandingly high temperature stability. Compared to that of the Nafion 212 and DPBI pristine membranes (CE reduces by 5.2%, 3.3%), the CE of DPBI/HTpBD-9 composite membrane-based cell only reduces by 0.9% as the temperature increases from 25 to 55 °C. This work provides a new preparation method for high ion-selective and high temperature stable battery membranes.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Jie Tang,Qi Li,Yubing Liu,Naizhang Xu,Kaiqiang Wang,Qitao Zhang,Wenjuan Yang,Yining Fan
In this study, the novel triphenylphosphine-based covalent organic frameworks (P–COF-1) were firstly introduced into polymeric carbon nitride (PCN) to fabricate P–COF-1/PCN heterojunctions via intermolecular π-π interaction. The photocatalytic H 2 production rate over the 9% P–COF-1/PCN heterojunctions is ca. 12 times as much as that of pure PCN. The photoelectrochemical measurements and theoretical calculation results show that due to the well-matched band structure between P–COF-1 and PCN, the photo-generated electrons tend to migrate from P–COF-1 into the conduction band of PCN through the interface of heterostructures. In addition to the π→π∗ electron transition of conjugated tri- s -triazine units in the 9% P–COF-1/PCN with band gap energy of 2.53 eV, the lone pair electrons of P transition to the π∗ orbitals of P–COF-1 (n→π∗) with lower band gap energy of 1.82 eV results in the effective separation of photo-generated carriers and more visible light absorption , and thus enhanced the photocatalytic hydrogen evolution .
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Hairui Hou,Zixuan Ma,Dedong Wu,Xiangxue Wang,Shujun Yu,Pan Zhang,Xiaoying Ma,Dong Fu
The development of adsorbents for efficient and highly selective seawater extraction of uranium was instrumental in fostering sustainable progress in energy and addressing the prevailing energy crisis. However, the complex background composition of the marine environment, including radionuclides, organic pollutants, and a large number of co-existing heavy metal ions, were non-negligible obstacles to the extraction of uranium from seawater. The present investigation successfully employed a self-templated approach to synthesize porous nitrogen-doped carbon (PNC) derived from COF, which exhibited tremendous potential as an adsorbent for pollutant removal in environmental treatment. LZU1@PNC not only retained the structural features of the original COF-LZU1, but also overcame the acid-base instability problem commonly found in COFs. Subsequently, the removal process of two typical water pollutants on the material was investigated using 2,4-DCP and [UO 2 (CO 3 ) 3 ] 4- . The results demonstrated that LZU1@PNC exhibited superior removal performance for the target pollutants compared to COF-LZU1, owing to its larger specific surface area and abundant defect structure. After six desorption-regeneration cycles, LZU1@PNC still maintained a high removal rate of the target contaminants, demonstrating the stability of this material and its excellent recyclability. In addition, based on various characterization techniques, the removal mechanism of 2,4-DCP was presumed to be mainly electrostatic attraction, hydrogen bonding, and π-π stacking interactions. Conversely, the elimination process of [UO 2 (CO 3 ) 3 ] 4- predominantly relied on surface complexation phenomena. The present investigation provided new perspectives and stimulated a broader study of other COF-derived carbon materials and their modifications as adsorbents for uranium extraction from seawater and other applications.
研究领域:
环境科学
·
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Yunzhe Jiang,Chuanyao Liu,Yanhong Li,Aisheng Huang
This work reports the preparation and post-synthetic modification of COF named BTADHBD with perfluorooctyltriethoxysilane (POTS) to obtain a superhydrophobic COF coating. Through post-synthetic modification, the water contact angle (CA) of BTADHBD is increased from 83.7° to 153.2° without change of crystals morphology and structure. BTADHBD COF coating was prepared on the stainless steel net (SSN) through repeated growth, followed by post-synthetic modification using (±)-glycidol (Glc) and POTS to obtain the SSN-supported superhydrophobic BTADHBD@Glc@POTS coating with a water CA of 152.1°. The superhydrophobic BTADHBD@Glc@POTS coating showed high water-resistance, self-cleaning property and oil/water separation performance using simply gravity as driving force. For various oil/water mixtures, the oil/water separation efficiency was always up to 99.5% with oil flux above 70 L/(m 2 ·s). For 50 successive cycles of oil/water separation, the high oil/water separation efficiency (above 99.5%) remained unchanged, which is very promising for oil/water separation.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Ren Li,Yueyuan Zhu,Xiuwen Zhang,Shuangying Li,Dong Wang,Zhaopeng Liu,Xinyao Wang,Yushun Hou,Shaoxiang Li
This article presents the synthesis of a porous hybrid material, comprising a melamine-terephthaldehyde-based two-dimensional π-conjugated covalent organic framework (COF) grown on a zinc-based metal-organic framework-5 (MOF-5). This hybrid material serves as a drug-loading platform for delivering penicillin G sodium salt. The material leverages the unique interactions between its benzene ring structure and β-lactam drugs, such as penicillin G sodium salt, as well as π-π stacking interactions, cations, and aromatic systems for drug adsorption. The pH responsiveness of the release phase is attributed to the attack of hydrogen ions on these interactions within the corrosion inhibition system. SEM, infrared spectrometry, and X-ray diffraction results confirm the successful synthesis of MOF@COFs. Drug adsorption experiments indicate that the material's maximum loading capacity reaches 51.23 % ± 0.57. Release experiments at different pH levels reveal that MOF@COFs exhibit pH responsiveness, achieving an optimal release rate and duration at pH 5.0, with a release time of approximately 12 h. Bacterial and biological toxicity tests confirm the material's expected antibacterial efficacy and safety for practical applications.
研究领域:
材料科学
·
药物化学
·
纳米技术
·
药物递送系统
·
生物无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Long Sun,Lingling Li,Jiajie Fan,Quanlong Xu,Dekun Ma
The rapid charge recombination and low surface reaction kinetics are the two major constraints to the photocatalytic performance of covalent organic frameworks (COFs). To accelerate the charge separation behavior, TpPa-1-COF is decorated with WO 3 via an in-situ growth approach, and the resultant WO 3 /TpPa-1-COF composites show significantly improved photocatalytic performance. Especially, when the WO 3 loading arrives at 3 wt%, 3%WO 3 /TpPa-1-COF exhibits the maximum photocatalytic H 2 evolution rate of 19.89 mmol g −1 h −1 , which is approximately 4.8 times higher than that of pure TpPa-1-COF. The apparent quantum efficiency (AQE) of 3%WO 3 /TpPa-1-COF at 420 nm is detected to be 12.4%. X-ray photoelectron spectroscopy (XPS) characterization confirms the formation of internal electric field between WO 3 and TpPa-1-CF, which can drive the photogenerated charge carrier diffusion in S-scheme mode. As a result, WO 3 /TpPa-1-COF composite possesses high charge separation efficiency and strong redox ability, which is further supported by the photoelectrochemical results, thus benefiting the photocatalysis process. This work provides a rational strategy to modify COFs in photocatalytic water splitting.
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
STAR Protocols
·
2022
·
IF 0
Xiao Wang,Wei Zhou,Hao Wu,Wei-Qiao Deng
Summary Single-atom catalysts (SACs) have promising atomic utilization efficiency and catalytic activity, but their construction with a specific coordination mode remains challenging. This protocol describes the synthesis of a coordinated Fe-SAC@COF for boosted electrocatalytic oxygen evolution reaction (OER). We also detail the steps for single iron atoms confinement and characterization of the COF and Fe-SAC@COF with X-ray diffraction and transmission electron microscopy technique. For complete details on the use and execution of this protocol, please refer to Wang et al. (2022) .
研究领域:
材料科学
·
催化
·
电化学
✓ 已验证
DOI
PubMed
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