MICROPOROUS AND MESOPOROUS MATERIALS
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2022
·
IF 5.876
Kaiwei Wang,Fumin Wang,Yi Zhai,Xu Zhang,Linfang Jiang,Zhibo Xu,Mengyue Li,Mengyao Li,Xubin Zhang,Mingshuai Sun
Zeolites with metal clusters encapsulated within the pore structure have attracted more attention because of their unique properties with high stability, but diffusion resistance is the bottleneck limiting the utilization efficiency of active centers, especially in macromolecular reactions. Hollow zeolites could effectively improve mass transport by reducing the wall thickness. In this work, cobalt-base hollow silicate-1 zeolite was obtained by mother liquid treatment with sodium chloride. Various characterization results show that the CoOx@HS-1-0.5Na + crystals have completely hollow structure and small cobalt cluster highly dispersed encapsulated in it. The presence of Lewis acid sites and the unique hollow structure resulted in enhanced selectivity to benzaldehyde in the styrene oxidation . The effect of various factors including cobalt loading, the concentration of sodium ion , reaction solvents and H 2 O 2 /styrene molar ratio on the catalytic performance were systematically investigated. The yield of benzaldehyde can achieve 73.8% with 83.59% styrene conversion and 88.29% benzaldehyde selectivity.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2020
·Vol. 412
·期 23
·5551-5561
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IF 3.637
Song Hongwei,Niu Xiangheng,Ye Kun,Wang Linjie,Xu Yuhu,Peng Yinxian
Given alkaline phosphatase (ALP) takes part in the phosphorylation/dephosphorylation processes in the body, its activity is universally taken as an important indicator of many diseases, and thus developing reliable and efficient methods for ALP activity determination becomes quite important. Here, we propose a new sensing strategy for ALP activity by integrating the improved peroxidase-mimicking catalysis of sulfuration-engineered CoO x with the hexametaphosphate ion (HMPi)–mediated electrostatic aggregation. After sulfuration engineering, the CoO x composite coming from the pyrolysis of ZIF-67 exhibits enhanced peroxidase-mimetic catalytic ability to oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) to its oxide TMBox, offering a remarkable color change from colorless to mazarine; with the presence of HMPi, the rapid electrostatic assembly of negatively charged HMPi and positively charged TMBox leads to the aggregation of the latter, resulting in a color fading phenomenon; when ALP is added in advance to hydrolyze the HMPi mediator, the aggregation procedure is significantly suppressed, and such that the solution color can be recovered. Based on this principle, efficient determination of ALP activity was gained, giving a wide detection scope from 0.8 to 320 U/L and a detection limit as low as 0.38 U/L. Reliable analysis of the target in serum samples was also achieved, verifying the feasibility and practicability of our strategy in measuring ALP activity for clinical applications.
Graphical abstract
研究领域:
生物化学
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医学诊断
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纳米材料科学
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DOI
PubMed
高影响因子
ACS Catalysis
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2026
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IF 13.6
Shiwei Wang,Xunxun Li,Yijia Li,Hexin Li,Lei Jing,Zicheng Wen,Yaru Wang,Shouying Huang,Jing Lv,Xinbin Ma
The pursuit of efficient catalysts for methanol oxidative carbonylation to dimethyl carbonate (DMC) is limited by the kinetic challenge of simultaneously activating CO and methanol on conventional single/mixed sites. Here, we demonstrate a Co0–CoOx interfacial engineering strategy via pyrolysis of bimetallic Zn/Co-ZIF to construct Co@NC catalysts. Systematic tuning of Zn/Co ratio and pyrolysis temperature controls nanoparticle size and oxidation state, yielding the optimal catalyst Co@NC-4, which exhibits a high DMC space-time yield (5.9 gDMC g–1 cat. h–1) and selectivity (97.8%). Through DFT and in situ spectroscopic investigations, we reveal a concentration-driven synergistic mechanism: Co0 sites preferentially adsorb and enrich CO, while the adjacent Co0–CoOx interface activates methanol to form methoxy intermediates. The local high CO concentration ensures rapid coupling with methoxy groups at the interface, significantly boosting reaction efficiency. This work establishes a fundamental design principle of spatially resolved bifunctionality for enhanced catalysis in C1 transformations.
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高影响因子
CATALYSIS LETTERS
·
2026
·Vol. 156
·期 7
·196
·
IF 2.5
Cai Chang,Li Jinhong,Li Rongwu,Zhao Nan,Zhang Yue,Fan Qiuyu,Zhang Jianguo,Chen Lidong
This study addresses the limitations of conventional industrial methods for acetophenone (AP) production by developing a modified TS-1 zeolite catalyst with a predominantly interparticle micro-mesoporous architecture for the selective oxidation of ethylbenzene (EB) under mild and environmentally benign conditions. To overcome the intrinsic pore constraints of TS-1 zeolite that restrict substrate accessibility and mass transfer, a specific sequential acid-then-alkali post-treatment strategy followed by cobalt oxide impregnation was employed. This treatment sequence leads to surface enrichment of framework-like Ti species and the creation of interparticle mesoporosity, resulting in a coexisting micro-mesoporous architecture while preserving the MFI framework. Under optimized reaction conditions, the catalyst achieved 76.2% EB conversion and 74.8% AP selectivity to AP. Systematic evaluation in the EB/H 2 O 2 oxidation system under acidic reaction conditions revealed a synergistic effect between framework titanium active sites and cobalt oxide active species. The developed catalyst offers distinct advantages, including straightforward synthesis procedure, high catalytic activity, and facile recoverability. Graphical This study constructs a micro-mesoporous TS-1 via specific sequential acid-then-alkali modification and loads optimal Co 3 O 4 to create dual active centers. This architecture reduces mass transfer resistance and optimizes active sites, enabling efficient ethylbenzene oxidation to acetophenone under mild conditions. The catalyst is easily recoverable, regenerable, and stable. The alternative text for this image may have been generated using AI.
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高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2025
·
IF 8.5
Jia Ke,Zhang Yanan,Zuo Rui,Lu Hongbing,Ji Kemeng,Chen Mingming
The sluggish bidirectional conversion rate between Li 2 S n (2 ≤ n ≤ 4) and Li 2 S, coupled with the uncontrolled deposition of Li 2 S, significantly impedes the realization of high-performance lithium–sulfur batteries (LSBs). In this study, a metal–organic framework was employed as a precursor for the synthesis of a CoO x –CeO 2− y /C (0 < x < 3/2, 0 < y < 1/2) heterojunction via pyrolysis, which was subsequently introduced onto the cathode side of the polypropylene (PP) separator in LSBs. The modification of CoO x –CeO 2− y /C enhances the kinetics of converting of Li 2 S n to Li 2 S during the discharge process. The Tafel slope for the Li 2 S deposition reaction is reduced to 52.1 mV/dec, representing a 56.6% decrease compared to LSBs with bare PP separator. Conversely, during the charging process, the modification lowers the energy barrier for the Li 2 S decomposition reaction, with the activation energy reduced to 6.12 kJ/mol, indicating a 70.3% decrease relative to LSBs with PP separator only. Consequently, more Li 2 S is promoted to undergo decomposition. The CoO x –CeO 2− y /C heterojunction facilitates uniform deposition of Li 2 S, featuring fine particles and a uniform distribution, after brief potentiostatic charging for decomposition, thereby effectively mitigating the deactivation of sulfur species. Thanks to the enhanced bidirectional conversion of lithium polysulfides (LiPS) facilitated by the CoO x –CeO 2− y /C modification layer, the (−)Li|CoO x –CeO 2− y /C@PP|S(+) coin cell maintains a Coulombic efficiency of 90.4% after 500 cycles at a current density of 1 C, exhibiting a low capacity-decay rate of only 0.081% per cycle, thereby demonstrating excellent long-cycle stability.
研究领域:
材料科学
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电化学
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DOI
高影响因子
Energy Material Advances
·
2025
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IF 15.9
Yue Peng,Pengfei Bi,Xu Zhu,Peitao Liu,Meijing Ren,Yanqing Zu,Xiaodong Li,Ailing Feng
The slow kinetics of oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER) pose important challenges to energy storage. Defect engineering offers an effective strategy to enhance the performance of electrocatalytic materials. In this study, we synthesized trifunctional catalysts (CoO X /Co 9 S 8 @NC) derived from cobalt-based metal–organic frameworks modified with oxygen-sulfur double vacancies. These vacancies improve catalytic activity by increasing active sites and enhancing charge-transfer capacity. The CoO X /Co 9 S 8 @NC catalyst demonstrates outstanding ORR and OER bifunctional activity (Δ E = 0.63 V) and HER performance comparable to noble metal catalysts. Liquid zinc-air batteries exhibited superior cycling stability (2,520 cycles at 2 mA/cm 2 ). This defect engineering strategy presents a novel pathway for developing high-performance electrocatalysts and holds important potential for energy-conversion technologies.
研究领域:
材料科学
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电化学
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能量存储与转换
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纳米复合材料
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催化
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高影响因子
Nanoscale
·
2017
·Vol. 9
·期 29
·10233-10239
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IF 7.367
Yanli Niu,Xiaoqin Huang,Xiaoshuai Wu,Lei Zhao,Weihua Hu,Chang Ming Li
Exploration of sustainable electrocatalysts toward oxygen reduction reaction (ORR) with high catalytic activity remains a key challenge in the development of metal–air batteries and fuel cells. In this work, a hybrid electrocatalyst composed of cobalt (Co/CoOx) nanoparticles encapsulated in Co/N-doped mesoporous graphene (Co/CoOx@Co/N-graphene) is reported for efficient ORR catalysis. The catalyst is rationally designed and synthesized via a facile combination of spontaneous one-pot polymerization of dopamine in the presence of graphene oxide (GO) and Co2+ ions and the subsequent carbonization process. The morphology, doping nature and ORR activity of the as-prepared catalyst are systematically investigated. It is found that there are abundant Co/N active sites and Co/CoOx nanoparticles in this hybrid catalyst, leading to a synergistic enhancement effect for improved ORR activity. In an alkaline environment, this Co/CoOx@Co/N-graphene catalyst displays Pt/C-comparable ORR activity in terms of half-wave potential and four-electron reduction selectivity, and higher limiting current density, better methanol tolerant ability and long-term durability. When being evaluated in a Zn–air battery, it demonstrates superior performance to the commercial Pt/C catalyst.
研究领域:
材料科学
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能源化学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Junxia Guo,Binling Chen,Qian Hao,Jun Nie,Guiping Ma
In this report, novel pod-like nitrogen-doped carbon fibers encapsulated with cobalt/cobalt oxide nanoparticles (Co/CoO x -N-C) were prepared by a facile method. Co/CoO x -N-C can be readily obtained from the carbonization of electrospun ZIF-67@PAN fiber. Both effects of ZIF-67 crystal size and pyrolysis temperature on the ORR were investigated. The optimal Co/CoO x -N-C-l, which has an average ZIF-67 size of 370 nm and a carbonization temperature of 800 °C, presents features of 1D hierarchical porosity pod-like structure, dispersion of nanoparticles, high content of N dopant, and high degree of graphitization, resulting in an excellent ORR performance. Co/CoO x -N-C-l presents an onset potential of −0.07 V (vs Ag/AgCl), a half-wave potential of −0.144 V, and a diffusion limited current density at 0.6 V of 4.9 mA/cm 2 . The relative current of Co/CoO x -N-C-l (90.1%) is much higher than that of the 20 wt% Pt/C (79.8%) after a 36,000 s of continuous operation. In addition, Co/CoO x -N-C-l was further applied as a cathode catalyst of the Zn-air battery. It exhibited an outstanding discharge specific capacity (610 mAh/g) and a comparable discharge voltage to that of 20 wt% Pt/C and RuO 2 . This study may provide a novel strategy to generate pod-like structured nanocomposites for energy devices.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
DALTON TRANSACTIONS
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2017
·Vol. 46
·期 32
·10578-10585
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IF 4.029
Siman Fang,Songsong Li,Lei Ge,Changcun Han,Ping Qiu,Yangqin Gao
Cobalt oxide decorated octahedral ceria hollow structures (CoOx/CeO2) with various contents of CoOx nanoparticles were prepared via a simple chemical impregnation method. The obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse-reflectance spectroscopy (DRS), surface photovoltage spectroscopy (SPV) and transient photovoltage spectroscopy (TPV). The photocatalytic oxygen evolution via water oxidation was investigated for the as-prepared CoOx/CeO2 nanocage composites. The photocatalytic results indicate that the CoOx/CeO2 nanocage composite with 1 mol% CoOx shows the highest photocatalytic activity. The excellent photocatalytic activity can be attributed to the improved visible-light absorption of CoOx/CeO2 composites and the efficient separation of excited electron–hole pairs between CoOx and CeO2, which can effectively enhance the lifetime of charge carriers in the CoOx-modified samples and then improve the oxygen evolution activity. Cobalt oxide is expected to be an excellent water oxidation co-catalyst for semiconductor photocatalysts.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2026
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IF 9.6
Ruofei Li,Hao Zhou,Jing Yao,Tiefeng Xu,Gangqiang Wang,Wangyang Lu
The conversion of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) via aerobic oxidation is a crucial step toward transforming biomass into sustainable bio-based energy materials. In this study, a mesoporous Au-CoO x /m-CeO 2 catalyst was prepared using vacuum-assisted in situ self-assembly to realise this conversion. The well-defined mesostructure, as confirmed by transmission electron microscopy and nitrogen adsorption–desorption analyses, significantly enhanced active site accessibility and facilitated reactant diffusion, thereby accelerating the selective oxidation of HMF to produce FDCA. This catalytic system achieved complete conversion of HMF and an FDCA yield of 99.89 ( ± 0.03)% under ambient pressure at 90 °C. Using Au/m-CeO 2 or Au-CoO x /CeO 2 as catalysts under identical conditions, the FDCA yields were limited to 56.8 ( ± 1.9)% and 78.1 ( ± 0.8)%, respectively. The optimal catalyst also demonstrated outstanding durability, retaining 93.9 ( ± 0.7)% FDCA yield after 18 reuse cycles. This remarkable activity was attributed to the integrated Au-CoO x /m-CeO 2 architecture, wherein a synergistic metal–oxide interaction coupled with the ordered mesoporous CeO 2 framework collectively optimised the reaction–diffusion process, driving efficient HMF oxidation. This study therefore provides a new perspective for designing efficient catalysts for the conversion of HMF to FDCA, which is conducive to the conversion of biomass resources.
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PubMed
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 6
·1-9
·
IF 5.479
Song Hongwei,Li Xin,He Yanfang,Peng Yinxian,Pan Jianming,Niu Xiangheng,Zhao Hongli,Lan Minbo
The authors present a colorimetric method for the evaluation of the hydroxyl radical scavenging capability of antioxidants by exploiting carbon-confined mixed cobalt oxide nanoparticles (denoted as C-confined CoO x NPs) as a novel peroxidase mimic. The nanozyme can be prepared from the metal-organic framework ZIF-67 by calcination at a moderate temperature. It exhibits peroxidase-mimicking activity and catalyzes the oxidation of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to form a blue product in the presence of H 2 O 2 via generation of hydroxyl radicals. However, in the presence of an antioxidant, the color reaction is suppressed due to scavenging of hydroxyl radicals by the antioxidant. Based on this principle, the hydroxy radical scavenging ability of glutathione (GSH), cysteine (Cys), tannic acid (TA) and tea polyphenols (TP) was assessed. It was found that these antioxidants can scavenge hydroxyl radicals in the following decreasing order: TA>Cys>GSH>TP. The assay was also used to quantify the antioxidative power of common fruit extracts.
Schematic presentation for evaluating the hydroxyl radical scavenging ability of different antioxidants using carbon-confined mixed cobalt oxide nanoparticles (denoted as C-confined CoO x NPs) as a highly active peroxidase mimic. With excellent activity, the C-confined CoO x NPs together with the visible peroxidase reaction can be employed as a powerful tool to rapidly screen appropriate antioxidants from natural samples and measure their activity for guiding their usage in related products.
研究领域:
生物化学
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分析化学
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材料科学
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DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2024
·
IF 9.3
Jie Li,Pengpeng Shao,Weijie Geng,Peng Lei,Jing Dong,Yingnan Chi,Changwen Hu
The oxidative depolymerization of β-O-4 linkages into value-added aromatic chemicals is of great importance for lignin valorization. However, achieving highly selective and rapid cleavage of β-O-4 linkages under mild conditions remains a challenge. Herein, cobalt–cobalt oxides (Co-CoOx) supported on N-doped carbon (CoMA/C900) combined with a green and recyclable base K7HNb6O19 (KNb6) have shown remarkable activity for the one-step oxidative cleavage of lignin β-O-4 linkages. Under relatively mild conditions (100 °C, 0.2 MPa O2), a lignin β-O-4 alcohol model compound was almost completely converted within 3 h, affording a narrow product distribution of phenol (yield: 99%) and methyl benzoate (yield: 98%). Based on the control experiments, kinetic study, and spectroscopic analysis, a synergistic oxidative cleavage mechanism was proposed: CoMA/C900 activates molecular oxygen to form a superoxide radical, while basic KNb6 promotes deprotonation of secondary alcohol, and they synergistically catalyze the oxidation of β-O-4 alcohol and the rapid cleavage of Cβ–O and Cα–Cβ bonds. During the reaction, the oxidation of β-O-4 alcohol to β-O-4 ketone is the rate-determining step, while the cleavage of PP-one to phenol and methyl benzoate can be completed within 15 min. Moreover, the CoMA/C900–KNb6 catalyst is recyclable at least three times and highly active for the oxidative cleavages of other lignin models and organosolv birch lignin.
研究领域:
化学工程
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材料科学
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生物质转化
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高影响因子
危险品化学品经营许可证（带存储）