ACS Applied Energy Materials
·
2021
·
IF 6.024
Peixin Liu,Peng Jing,Xuan Xu,Baocang Liu,Jun Zhang
The electrochemical synthesis of ammonia from N2 under mild conditions is a promising alternative to the energy-consuming Haber–Bosch process. Metal–organic frameworks (MOFs) are promising electrocatalysts for the N2 reduction reaction, but most of them are active for the undesirable and competitive hydrogen evolution reaction. Herein, we developed a facile strategy to grow a Ce-MOF on copper mesh substrate. The Ce-MOF with a self-supporting structure could be directly used as an electrode for the N2 reduction reaction, demonstrating highly efficient electrocatalytic performance with an NH3 yield of 14.83 μg h–1 cm–2 and a Faradaic efficiency of 10.81% at −0.2 V versus a reversible hydrogen electrode. Structural characterizations of Ce-MOF after electrocatalysis revealed that Ce-MOF as precatalyst underwent structural reconstruction at negative potential, forming catalytically active CeO2 with oxygen vacancies embedded in the amorphous Ce-MOF. In addition, the self-supporting structure formed by in situ growth of Ce-MOF on porous and conductive cooper mesh endowed the electrocatalyst with enhanced stability, conductivity, and mass transport. This work demonstrated the structural transformation of Ce-MOF during the electrocatalytic process and provided new insight for the rational design of MOF-based electrocatalysts.
研究领域:
材料科学
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电化学
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催化反应
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 5
·51571
·
IF 3.125
Legang Chen,Zongxue Yu,Di Yin,Kunyao Cao,Chunxia Xie,Lijuan Zhu,Yong Jiang
Herein, a new strategy for improving epoxy coatings' anti-corrosion performance has been developed, which combined NH 2 -Ce-MOF with graphene oxide (GO) by hydrothermal method. First, the nanocomposite material's morphology and structure (GO-Ce-MOF) were confirmed by Fourier transform infrared, X-ray diffraction, TG, X-ray photoelectron spectroscopy, and scanning electron microscope (SEM) studies. The dispersity of the composite in the epoxy coating was evaluated by SEM and mapping analysis. Meanwhile, the anti-corrosion of as-prepared composite coatings was investigated in detail by the electrochemical impedance spectroscopy (EIS) and the Tafel polarization curve test. The results illustrated that 2.0 wt% GO-Ce-MOF/EP greatly enhanced the composite coating's anti-corrosion performance compared to other coatings. The reasons for the improvement of the anti-corrosion performance of the composite coating are attributed to the following two aspects: On the one hand, the addition of GO can provide a physical barrier to form a labyrinth effect to slow down the invasion of corrosive media into the metal substrate, on the other hand, the modification of GO can GO-Ce-MOF achieve better compatibility and dispersion in epoxy resin.
研究领域:
材料科学
·
腐蚀与防护
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 3
·1-11
·
IF 6.408
Qiang Yu,Yang Weixia,Zhang Xiaoshuo,Luo Xueli,Tang Wenzhi,Yue Tianli,Li Zhonghong
A nanocomposite was prepared by loading UiO-67 nanoparticles onto porous carbon materials derived from Ce-MOF (Ce-PC) for fluorescence detection of glyphosate. The probe (UiO-67/Ce-PC) exhibits fluorescence emission at 414 nm as the response signal under excitation at 310 nm. The fluorescence enhancement mode of UiO-67 reduces the background interference, and the introduction of Ce-PC provide hierarchical nanostructure and large specific surface area that can increase the contact availability and improve the pre-enrichment effect, ensuring UiO-67/Ce-PC with superior sensitivity. The abundant metal hydroxyl group (M–O-H) of UiO-67/Ce-PC could recognize phosphoryl groups (-PO 3 H 2 ) of glyphosate through ligand exchange, which synergizes with H-bonding interaction and electrostatic attraction to exhibit specificity toward glyphosate. The competitive coordination effects weaken the ligand-to-metal charge transfer (LMCT) and consequently induce the fluorescence recovery. The calibration plot of the fluorescence enhancement response of UiO-67/Ce-PC towards glyphosate was recorded in the range 0.02–30 μg mL −1 with a low limit of detection (LOD) of 0.0062 μg mL −1 , which is superior to the pure UiO-67. In addition, the sensor exhibited high selectivity and satisfactory accuracy and precision with recoveries of 92.1–105.6% and RSDs below 3.4%. This work not only presents a feasible sensor for sensitive and selective determination of glyphosate from cereal samples, but also provides a promising strategy for the design of MOF-based nanocomposites to achieve trace detection of various pollutants. Graphical abstract
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Xiaowen Wang,Dameng Gao,Xiao Liu,Xingyue He,Jian-Gong Ma,Peng Cheng
4-Nitrophenol (4-NP) is a common stuff involved in industrial production as well as a toxic pollutant which poses a threat to the environment and human health if not handled properly. Here, we have designed and synthesized two new metal-organic frameworks (MOFs), namely Ce-MOF-1 and Ce-MOF-2 with both fluorescent and electrochemical activities, which exhibite dual-mode sensing of 4-NP. The fluorescence emission spectra at 366 nm of both Ce-MOF-1 and Ce-MOF-2 displayed a significant turn-off signal affected by the competitive absorption and photoelectron transfer of 4-NP with the detection limits of 1.25 and 0.78 μM, respectively. Simutanously, in electrochemical sensing, 4-NP is irreversibly reduced to 4-hydroxylamine phenol under the catalysis of Ce-MOFs coating on electrode, which exhibit higher accuracy than fluorescence with detection limits of 0.36 and 0.41 μM, respectively, for the quantitatively sensing of 4-NP. Due to their complementary immunity to interference in electrochemical and fluorescence methods for 4-NP detection, Ce-MOFs exhibit more accurate 4-NP detection ability compared to other sensors. Finallly, both Ce-MOFs demonstrate excellent stability, reproducibility and selectivity in dual-mode sensing of 4-NP in tap water, that provides superior adaptability, reliability and accuracy compared to the traditional single-mode sensing method.
研究领域:
环境科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Yuan Qin,Huimei Liang,Jia Wu,Zheyang Chi,Shulin Zhao,Fanggui Ye
Natural enzyme cascades, including the same and different kinds of enzymes, have been widely used in biosensing. However, it is still a challenge for nanozymes, the mimics of natural enzymes, to achieve biosensing with different types of enzyme-like activities based on cascade reactions, such as hydrolase and oxidoreductase. Considering the characteristics of the multienzyme-like activity of some nanozymes, as a proof of concept, this study demonstrates a Cu/Ce-MOF-808 nanozyme as a self-cascade catalyst with hydrolase-like and catechol oxidase-like activities. Taking organophosphorus pesticides as an example, we constructed a self-cascade catalytic reaction for the one-step colorimetric detection of isocarbophos. Specifically, the hydrolase-like activity of Cu/Ce-MOF-808 can hydrolyze isocarbophos to produce colorless isopropyl salicylate, which is further oxidized by the catechol oxidase-like activity of Cu/Ce-MOF-808 and complexed with 4-aminoantipyrine (4-AAP) to produce red quinoneimine under neutral conditions with illumination. Thus, a colorimetric strategy for sensitive isocarbophos analysis is developed, with a linear range of 0.90–400.00 μg·mL–1 and a detection limit of 0.42 μg·mL–1. This research presents a new approach to the design and synthesis of nanozymes and has great application potential in the field of nanozyme cascade biosensing.
研究领域:
生物化学
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纳米生物学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Jun Yuan,Bo-Yuan Wang,Yi-Chao Zong,Fu-Qing Zhang
Fabricating efficient and stable photocatalysts with an improved photocatalytic property is necessary to decontaminate wastewater. Herein, the Ce-MOF@h-CeO 2 microspheres with a hollow structure are designed and synthesized. The unique hollow structure with the π-π conjugate organic ligand offers abundant reactive sites and a charge transfer channel, both enhancing the performance of photocatalysts. The SEM and TEM tests showed that the Ce-MOF@h-CeO 2 composite retains the hollow microsphere structure, and its diameter is about 600–900 nm. At the same time, the prepared composite showed excellent photocatalytic performance for the degradation of rhodamine B (RhB) under visible-light-driven, within 30 min dark adsorption and 150 min visible light, the degradation rate for RhB reached 95.5% of Ce-MOF/h-CeO 2 -2 composite, which were 7.17 and 4.46 times of h-CeO 2 and Ce-MOF, respectively. Furthermore, the composite of Ce-MOF@h-CeO 2 -2 exhibited a remarkable photocatalytic hydrogen evolution efficiency (3419.38 μmol‧g −1 ‧h −1 ), which was 15.16 and 10.91 times greater than that of the pure samples. This study provides helpful results of the metal–organic framework that can sensitize effectively the inorganic semiconductor materials for improving photocatalytic performance.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
Functional Materials Letters
·
2023
·
IF 1.3
Meiqi Zhai,Yajie Bai,Xia Li,Fengfeng Wang,Wei-Qiang Fan,Hongye Bai
Photoelectrochemical reduction of nitrate (PEC NRR) to ammonia (NH 3 ) is a promising means with water as hydrogen source under room temperature. The construction of photoelectrode with efficient light response and reaction kinetics is the core point to achieve high NH 3 yield efficiency. Herein, a cerium-based metal organic framework (Ce-MOF) was successfully decorated on the copper phthalocyanine (CuPc). The CuPc/Ce-MOF heterostructure exhibits the ideal nitrate catalytic reduction activity, and the NH 3 yield (−0.6 V versus RHE) increases to 1.58 μ g h − 1 cm − 2 from 0.67 μ g h − 1 cm − 2 (CuPc). Besides, the cycle experiments reveal that the CuPc/Ce-MOF heterostructure has maintained good catalytic stability. This work explores the PEC NRR process mechanism of CuPc/Ce-MOF samples and provides a new idea for green NH 3 production.
研究领域:
材料科学
·
电化学
·
光化学
·
催化
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Yajun Liu,Yongzhi Xiong,Chenxin Jin,Changzhou Chen,Liangliang Zhang,Jianchun Jiang,Jingcong Xie
Herein, a novel hydrothermal synthesis strategy is proposed for the preparation of novel Cu-Ce MOF heterojunction nano catalysts (CuCeO X /C) for 5-hydroxymethylfurfural (HMF) electrooxidation reaction in this paper. CuCeO X /C exhibits superior catalytic performance, with the current density of CuCeO X /C reaching 100 mA cm −2 at a low potential of 1.408 V vs. RHE, and doubling to 280 mA cm −2 at a lower potential of 1.5 V vs. RHE. Under these conditions, the conversion of HMF reaches 100 %, with a selectivity of over 99.11 % for 2,5-furan dicarboxylic acid (FDCA) and a Faradaic efficiency of 97.76 %. Theoretical calculations and In-situ-EIS have demonstrated that Ce-based Cu-MOF heterojunction nanocatalysts enhance the adsorption energy of the CuCeO X /C catalysts on HMF substrates while also decreasing reaction energy barrier of HMFOR. Based on our work, the employment of CeCu/MOF heterojunction electrocatalysts for efficient electro-oxidation of HMF to FDCA paves a green and sustainable way for advancing sustainable chemical processes and biomass valorization.
研究领域:
化学工程
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材料科学
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催化反应
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Xiaoxian Hu,Jing Qian,Juan Yang,Xiaomin Hu,Yanjiao Zou,Nianjun Yang
Covalent organic frameworks (COFs), a newly emerging kind of porous material, have gained extensive attention due to their fascinating structural features. However, the superiority of COFs as electrochemical sensing materials has not yet been adequately explored. Herein, a new type of core–shell metal–organic framework (MOF)@COF composites are synthesized through in situ growth of TAPB-DMTP-COF on the pre-synthesized Ce-BDC core. The thickness of the COF shell can be controlled to 20–50 nm by adjusting the Ce-MOF mass. It is found that the obtained MOF@COF composite possesses a larger electrochemical active area and faster electron transfer kinetic than its single component. As a case application of this composite, it has been employed as a sensing material for voltammetric detection of metol, where a linear range from 0.1 − 200 μM and a detection limit of 30 nM have been obtained. This study provides a new strategy to synthesize COF-based electrode materials as well as to explore their electrochemical properties and applications.
研究领域:
材料科学
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电化学
·
纳米技术
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产品关联
DOI
高影响因子
Biosensors-Basel
·
2021
·Vol. 11
·期 7
·204
·
IF 5.519
Yanyan Cheng,Ling Liang,Fanggui Ye,Shulin Zhao
Metal–organic framework (MOF) nanozymes, as emerging members of the nanozymes, have received more and more attention due to their composition and structural characteristics. In this work, we report that mixed-valence state Ce-MOF (MVCM) has intrinsic haloperoxidase-mimicking activity. MVCM was synthesized by partial oxidation method using Ce-MOF as a precursor. In the presence of H2O2and Br−, MVCM can catalyze oxidative bromination of chromogenic substrate phenol red (PR) to produce the blue product bromophenol blue (Br4PR), showing good haloperoxidase-like activity. Because of the special chromogenic substrate, we constructed a ratiometric colorimetric-sensing platform by detecting the absorbance of the MVCM-(PR, Br−) system at wavelengths of 590 and 430, for quantifying H2O2, where the detection limit of the H2O2is 3.25 μM. In addition, the haloperoxidase-mimicking mechanism of the MVCM is proposed. Moreover, through enzyme kinetics monitoring, theKm(H2O2and NH4Br) of the MVCM is lower than that of cerium oxide nanomaterials, indicating that the MVCM has a stronger binding affinity for H2O2and NH4Br than other materials. This work provides more application prospects for the development of nanozymes in the field of biosensors in the future.Keywords:nanozyme;Ce-MOF;haloperoxidase-like activity;ratiometric colorimetric;hydrogen peroxide
研究领域:
生物传感
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材料科学
·
酶学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 46
·32030-32044
·
IF 10.7
Xue Bi,Kunpeng Song,Qianlong Li,Tao Lin,Ye-Tang Pan,Wei Wang,Jiyu He,Rongjie Yang
In recent years, there have been few reports on the application of zeolites in the field of flame retardants, although their excellent thermal stability indicates great potential as flame retardants. However, a key challenge that needs to be solved urgently is the compatibility between molecular sieves as inorganic fillers and polymer matrices, which directly affects their performance and stability in practical applications. In this work, ZSM-5 zeolite was used as the carrier, Ce ions were introduced through ion exchange, and the growth of Ce-MOF was restricted on its surface, and a Ce-MOF@ZSM-5 hybrid material was designed to improve the flame retardant and ultraviolet resistance properties of thermoplastic polyurethane elastomer (TPU). The absorbance value of TPU composites in the whole region is significantly higher than that of pure TPU, and its absorbance reaches 1.33. Compared with pure TPU, the peak heat release rate and peak smoke production rate of TPU/Ce-MOF@ZSM-5 composites were reduced by 26.0% and 34.8%, respectively. In addition, the chemical resistance of TPU composites has been significantly improved. This work provides the possibility of preparing three-proofing TPU materials with UV resistance, chemical resistance and fire resistance, and is expected to expand the application of TPU materials in other fields.
研究领域:
材料科学
·
高分子化学
·
阻燃材料研究
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Chenkai Xu,Yujie Yuan,Valeryia Kasneryk,Maria Serdechnova,Carsten Blawert,Yuankun Wei,Dongmei Zeng,Mengke Wang,Dahai Gao,Hao Wang,Mikhail L. Zheludkevich,You Zhang
Corrosion protection of high-strength aluminum alloys remains a critical challenge, especially for applications in marine and aerospace environments. This work reports BIPT-6, a new cerium-based metal-organic framework designed for sustainable corrosion protection of AA2024 aluminum alloy. BIPT-6 contains both Ce(III) and Ce(IV) ions and is constructed with 2,5-furandicarboxylate (FDA 2− ), a biomass-derived ligand, through a simple one-pot solvothermal method. The structure and composition were verified by a series of advanced characterization methods. BIPT-6 crystallizes in a monoclinic system with space group P 2 1/ n . The protective ability of novel BIPT-6 was evaluated by electrochemical impedance spectroscopy (EIS). It demonstrated good corrosion inhibition efficiency for the AA2024 aluminum alloy samples immersed in 0.05 mol/L NaCl solution containing 5 × 10 −4 mol/L BIPT-6. Finally, BIPT-6 was applied as an additive to epoxy resin to prepare anti-corrosive coatings. The EIS results show that BIPT-6@Epoxy coating system provides a superior corrosion protection and stability to aluminum alloy AA2024 compared to blank coating. The corrosion inhibition mechanism of BIPT-6 was also investigated, highlighting its synergistic effect from dual corrosion inhibitors. This work showcased BIPT-6 as a promising approach for sustainable, smart corrosion protection strategies in aluminum alloys.
研究领域:
材料科学
·
腐蚀工程
·
金属有机框架
·
表面工程
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）