APPLIED CATALYSIS A-GENERAL
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2019
·
IF 4.63
Yihu Dai,Chunyang Jiang,Min Xu,Bo Bian,Di Lu,Yanhui Yang
Anilines as important intermediates for both organic synthesis and industrial manufactory are densely substituted with a variety of functional moieties, and the transformation of nitroarenes into corresponding anilines requires catalytically selective hydrogenation catalyst. Herein, we describe a simple pyrolysis strategy to prepare cobalt catalysts in nitrogen-doped carbon matrix applied in the selective hydrogenation of nitroarenes with molecular hydrogen. The Co/NC catalysts are obtained through thermal treatment of mixed precursors of cobalt phthalocyanine and melamine . The surface-modified Co particles with Co 3 O 4 and CoN x sites are surrounded by N-doped carbon layers according to a series of structural characterization results. These Co/NC catalysts are capable of efficiently selective hydrogenation of nitrobenzene and various substituted nitroarenes into corresponding anilines under relatively mild reaction conditions. The optimal catalytic hydrogenation performance is contributed to the fast rate of H 2 dissociated activation on the CoN x active sites and the facile adsorption of the reactant substances, which is verified by the isotopic H 2 -D 2 exchange experiments, reactant adsorption and the ORR reaction tests. Furthermore, the heterogeneous Co/NC catalyst is highly stable without the Co leaching and deactivation issues during the recycling reaction runs.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Bioactive Materials
·
2025
·
IF 20.3
Danyan Wang,Hui Jin,Yetao Shen,Dandan Wang,Jingjing He,Jinmiao Qu,Xiaojun He,Zhengli Jiang
Methicillin-resistant Staphylococcus aureus (MRSA) remains a major pathogen in ventilator-associated pneumonia and wound infections. To address the limitations of traditional antibiotics, we developed a novel iridium-based single-atom catalyst (Ir/CN SAC) anchored on a nitrogen-doped carbon matrix. Engineered for ultra-low metal loading and maximal active site exposure, this catalyst integrates robust photothermal and catalytic functionalities. Under second near-infrared (NIR-II, 1270 nm) irradiation, the Ir/CN SAC efficiently converts light to heat and catalytically generates reactive oxygen species (ROS), achieving a potent photothermal-catalytic synergistic effect. This dual-action mechanism enabled rapid bacterial eradication in vitro and significantly accelerated wound healing and lung tissue repair in MRSA-infected in vivo models. Transcriptomic analyses revealed downregulation of pro-inflammatory pathways, shedding light on the immunomodulatory roles of the treatment. Notably, the Ir/CN SAC exhibited negligible toxicity and enhanced peroxidase-mimicking activity via thermal activation. Collectively, the Ir/CN SAC presents a promising strategy for treating MRSA infections in wounds and the lungs via a synergistic treatment model.
研究领域:
生物医学工程
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纳米医学
·
感染病学
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产品关联
DOI
PubMed
高影响因子
ACS Catalysis
·
2015
·
IF 9.312
Kui Shen,Liang Chen,Jilan Long,Wei Zhong,Yingwei Li
Although MOFs supporting noble metal nanoparticles (NPs) have been widely used in heterogeneous catalysis, they are still limited in catalytic efficiency on a per-noble-metal-atom basis. Here we developed a MOFs-templated strategy to non-noble metal @noble metal core–shell nanocatalysts, which could far surpass the traditional MOFs supporting noble NPs in catalytic properties, by using MOFs-derived metal NPs as sacrificial templates to reduce noble metal ions via galvanic replacement reaction. As a model system, Co@Pd core–shell NPs embedded in the N-doped carbon matrix (Co@Pd/NC) were synthesized with an average size of ca. 9.4 nm and a ultrathin Pd shell by using ZIF-67 and Pd(NO3)2 as the precursor and Pd source, respectively. The highly exposed Pd atom on Co nanoparticles made it an attractive catalyst with high efficiency. When being used in the hydrogenation of nitrobenzene, the Co@Pd/NC exhibited an unprecedented high activity over Pd-based catalysts, yielding 98% conversion after 45 min reaction, which was far more active than the pristine ZIF-67 and MIL-101 supporting Pd NPs (with 40% and 3% conversion after 90 min reaction, respectively) under identical conditions, suggesting its overwhelmingly better performance than MOFs supporting noble NPs. We anticipated that this strategy would form the basis for developing a new class of MOF-templated core–shell nanocatalyst with potential applications in numerous catalytic reactions.
研究领域:
催化
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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
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Zhonghui Zheng,Jichao Wang,Meng Liu,Bibimaryam Mousavi,Ning Liu,Somboon Chaemchuen
A facile and green method is developed to synthesize cobalt species embedded in a nitrogen-doped carbon matrix (P–Co@NCs). The materials are synthesized using hard template precursors via single-step in-situ thermal treatment under free solvent conditions. The optimal P–Co@NC composite prepared through rational synthesis and synergic composition shows an efficient electrocatalytic performance for oxygen evolution reduction (OER). The P–Co@NC exhibits the OER overpotential of 350 mv at 10 mA cm −2 and low Tafel 73 mv·dec −1 in 0.1 M KOH electrolyte. The advantage of catalyst is the dispersion of Co species, which are in close interaction with nitrogen-doped carbon matrix. The Co-Nx plays a dominating role among Co species in P–Co@NC and is well protected by the nitrogen-doped carbon matrix layer. That resulted in efficient electron transport on CNTs (high conductivity) that improves the OER performance of P–Co@NC compared to the reference catalysts (IrO 2 and B–Co@NC). The P–Co@NC also showed excellent cycling performance from long-term chronoamperometry testing. Interestingly, the P–Co@NC catalyst could be synthesized straightforward via a short solvent-free single-step process that introduced it as a green and environmental friendly method, which can be potential to develop catalyst based on metal embedded N-doped carbon.
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
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Jingdong Yang,Xueyan Xu,Xufeng Zhou,Shunqiong Jiang,Wen Chen,Siqi Shi,Da Wang,Zhaoping Liu
Co3O4 nanoparticles with smaller particle size can expose more active sites to react with electrolytes, thereby exhibiting better supercapacitive performance. However, the size of Co3O4 nanoparticles is difficult to be effectively controlled in traditional carbon matrices. Herein, P, N-codoped carbon matrices with ultrahigh surface area and abundant nanocavities are used as a novel host to confine the growth of Co3O4 nanoparticles. The Co3O4/carbon composites with high redox activities of Co3O4 are successfully obtained, in which Co3O4 nanoparticles are strongly anchored in the carbon matrices, resulting in the enhancement of the composites’ capacitive performance (1310 F g–1 at 0.5 A g–1). Meanwhile, the strong anchoring effect of the carbon host on Co3O4 nanoparticles because of the rich doping elements and the confinement effect of the nanocavities ensure long-term stability (92% capacitance retention after 5000 cycles). Furthermore, the assembled asymmetric supercapacitor using this composite as the cathode material and activated carbon as the anode material delivers a high energy density of 47.18 W h kg–1 at 375 W kg–1.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Eryang Mao,Lin Fu,Weiwei Liu,Xianhui Gao,Jing Liu,Renming Zhan
The traditional graphite anode with a specific capacity of 372 mA h g −1 for lithium-ion batteries (LIBs) can’t satisfy the increasing demands of energy density . Germanium (Ge) anode material has been considered as a promising candidate owning to its higher theoretical specific capacity (∼1600 mA h g −1 ). Unfortunately, lithiation/delithiation process of Ge produces a huge volume variation, resulting in poor electrochemical performances. Herein, we designed and prepared a unique Ge-based composite that immersing hetero-Cu 3 Ge/Cu into a nitrogen-doped carbon matrix (CG/G@NC). In this delicate architecture, both NC and electrochemically inert Cu 3 Ge act as conductive additives and volume buffers to improve conductivity and mitigate volume changes, respectively. Also, heterostructure possesses good charge transfer kinetics and offers an additional Li + diffusion path. As result, the Li + diffusion in CG/G@NC composite is ∼930 times as fast as commercial Ge and ∼320 times as fast as NC. As expected, the as-prepared CG/G@NC composite exhibits superior outstanding cycle stability (455 mA h g −1 after 500 cycles at a constant current density 1000 mA g −1 ) and exceptional rate capability. Meaningfully, encapsulating Ge-based heterostructure materials with functional components into the carbon matrix is a promising method to facilitate the practical application of Ge-based anode materials.
研究领域:
材料科学
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电化学
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储能技术
✓ 已验证
DOI
高影响因子
CHINESE CHEMICAL LETTERS
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2019
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IF 3.839
Yan Dong,Yuezhan Feng,Jiwei Deng,Pengbin He,Jianmin Ma
Antimony-based materials have become promising anodes within lithium-ion batteries (LIBs) due to their low cost and the high theoretical capacity. However, there is a potential to further enhance the electrochemical performance of such antimony-based materials. Herein, Sb 2 Se 3 @C nanofibers (Sb 2 Se 3 @CNFs) are designed and obtained via a novel electrospinning method. Upon electrochemically testing as an anode within LIBs, the Sb 2 Se 3 @CNFs (annealed at 600 °C) delivers a remarkably good cycling performance of 625 mAh/g at 100 mA/g after 100 cycles. Moreover, it still remains at 490 mAh/g after 500 cycles with an applied current density of 1.0 A/g. The excellent performance of the Sb 2 Se 3 @CNFs can be attributed to the fact that the N-doped C matrices not only remit the volume expansion of materials, but also enhance the electrical and ionic conductivity thusly increasing the lithium-ion diffusion. The obtained Sb 2 Se 3 @CNFs are promising anode for LIBs in the future.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2020
·Vol. 26
·期 7
·3297-3305
·
IF 2.394
Shen Kaixiang,Chen Hedong,Hou Xianhua,Wang Shaofeng,Qin Haiqing,Gao Yumei,Shen Jiadong
To improve the long cyclic stability and rate capability of Si-based anode, we demonstrate a core-shell structural Si@NC composite decorates with N-doped carbon network using a low-cost, a simple process of electrospinning and low-temperature pyrolysis. Si@PVP/Urea fabric composite spun on the copper foil was directly carbonized and then was cut into wafers used as the electrode plates without extra conductive agent and binder. The enhanced rate capability and cyclic stability of special structural Si@NC is mainly ascribable to N-doped carbon matrix providing numerous active sites, which attract Li to those points in an efficient way, and the core-shell structures supply high mechanical strength for Si@NC composite. Importantly, almost 3-fold improvement in the capacity retention rate of the Si@NC has been observed at high current densities of 1.6 and 3.2 A g −1 . Meanwhile, DFT calculations confirm that Li will be easily adsorbed by N-active sites in N-doped carbon model to strengthen chemical absorption ability, which could have more chance to grab the quickly moving Li in a brief period. It is significant for theoretical guidance of subsequent studies. The findings should make an important contribution providing a great possibility for the mass production and application to the field of lithium-ion battery.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
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2025
·
IF 2.6
Minzi Li,Hongying Wang,Shaohong Zhang,Ran Zhang,Zhijuan Wang
A trimetallic (Fe, Co, Zn) nanozyme embedded within a N-doped carbon matrix (FeCoZn-NC-1.5-800) was engineered via coordination-controlled pyrolysis of Fe ions doped core-shell ZIF-8@ZIF-67 (ZIF-8@ZIF-67-Fe-1.5) precursor, which exhibited dual oxidase/peroxidase-mimicking activities. The bifunctional catalyst oxidized 3,3',5,5'-tetramethylbenzidine (TMB) to form a blue product of oxidized TMB (oxTMB) without exogenous H2O2. However, the addition of L-cysteine (L-Cys) acted as a potent inhibitor, quenching oxTMB formation via thiol-mediated electron transfer, leading to a significant decrease in absorbance and the fading of the blue colour to colourless. Consequently, an H2O2-independent colormetric biosensor was developed with a wide linear range (5-50 μM), a low detection limit (0.569 μM, 3σ), good selectivity and anti-interference ability. This work establishes a paradigm for transition metal nanozyme design, offering clinical translation potential in point-of-care thiol monitoring and biocatalytic system development.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Qimeng Peng,Ju Fu,Gang Chen,Dong Feng,Tianbiao Zeng
Antimony sulfides exhibit a tremendous potential owing to the high theoretical specific capacity from multiple redox storage mechanisms for sodium-ion batteries (SIBs). However, these bottlenecks, including low electrical conductivity , poor ionic diffusion kinetics, and severe volume expansion, still restrict the development of antimony sulfide as SIBs anodes. Meanwhile, in view of long-term interests and practical application, the cost-efficient preparation methods become an imminent challenge to the advancement of high-performance SIBs anodes. Here, a novel three-step strategy, composed of co-precipitation, heat reduction processes, and sulfation conversion, was utilized to construct a “reinforced concrete” architecture, in which Sb 2 S 3 nanoparticles embedded in N-doped carbon matrix (NC) modified by carbon nanotubes (CNTs), denoted as Sb 2 S 3 /CNTs/NC. As the “cement block”, the N-doped 3D carbon matrix can promote the electron migration and reduce the aggregation of active materials upon cycling. In terms of “rebars” (i.e., 1D CNTs) for ensuring the anode integrality during incessant sodiation/de-sodiation processes, they function as binders and stabilizers , which intimately cross-link with Sb 2 S 3 nanoparticles and carbon matrix, accommodate the volume change, and maintain the fast transfer of electron transfer inside the whole composite. Benefiting from these merits of the hierarchical structure (i.e., 3D NC and 1D CNTs), as an anode for SIBs, Sb 2 S 3 /CNTs/NC demonstrates an improved sodium storage capability with an initial specific capacity of 770.80 mAh g −1 at 0.1 A g −1 and a superior initial coulombic efficiency (ICE) of 79.90%. Moreover, even at a high current density of 1.0 A g −1 , a reversible capacity of 313.54 mAh g −1 can be delivered after 350 long cycles, indicating the stable cyclicity. The Sb 2 S 3 /CNTs/NC with designed construction and enhanced electrochemical performance could provide a new perspective on low-cost, time-saving, and exercisable synthesis approach for high-performance sulfide-based anodes.
研究领域:
材料科学
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电化学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Sehrish Mehdi,Yanyan Liu,Huijuan Wei,Hao Wen,Ruofan Shen,Zhikun Peng,Huanhuan Zhang,Xianli Wu,Chengming Wang,Shuyan Guan,Tao Liu,Baojun Li
Zeolitic imidazole framework (ZIF-67)-derived Co metal catalysts have gained attention as competitive catalysts due to their high metal loading and superior metal dispersion. However, the problems of Co cluster aggregation during use and difficulty in collection of the powder catalyst from the reaction system need to be solved. In this work, Co-based nanoparticles (NPs) are fabricated on a Ni foam. The monolithic catalyst, Co–NC/NF, has been prepared by the pyrolysis of the ZIF-67/NF precursor using manual coating. The characterization confirms the embedding and uniform distribution of Co NPs (10–20 nm) in the N-doped C matrix. The optimized Co–NC/NF600 reveals satisfactory catalytic activity upon hydrolysis of ammonia borane with a hydrogen evolution (rB = 1176 mL min–1 g–1Co), a turn over frequency (TOF = 180 h–1), and an apparent activation energy (Ea = 64 kJ mol–1). The catalytic activity of Co–NC/NF600 with Co and CoOx as active sites has the best rank among the previously reported Co monolithic catalysts. The superior stability and reusability of the catalyst with ∼ 90% retention after five uses are demonstrated under mild NH3BH3 hydrolysis conditions, originating from the high antiaggregation ability of the active sites and the easy recollection of the catalyst. The adopted novel strategy has the potential to synthesize monolithic catalysts applicable in other fields of heterogeneous catalysis in industrial applications such as energy storage and conversion.
研究领域:
材料科学
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催化
·
能源存储与转换
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Yunxia Duan,Yongming Xia,Yuxuan Ling,Shijie Zhou,Xuehui Liu,Yinghui Lan,Xiong Yin,Yusen Yang,Xiaoying Yan,Minghui Liang,Song Hong,Lipeng Zhang,Leyu Wang
Manipulating the local coordination environment of central metal atoms in single-atom catalysts (SACs) is a powerful strategy to exploit efficient SACs with optimal electronic structures for various applications. Herein, Co-SACs featured by Co single atoms with coordinating S atoms in the second shell dispersed in a nitrogen-doped carbon matrix have been developed toward the selective hydrogenation of halo-nitrobenzene. The location of the S atom in the model Co-SAC is verified through synchrotron-based X-ray absorption spectroscopy and theoretical calculations. The resultant Co-SACs containing second-coordination shell S atoms demonstrate excellent activity and outstanding durability for selective hydrogenation, superior to most precious metal-based catalysts. In situ characterizations and theoretical results verify that high activity and selectivity are attributed to the advantageous formation of the Co–O bond between p-chloronitrobenzene and Co atom at Co1N4–S moieties and the lower free energy and energy barriers of the reaction. Our findings unveil the correlation between the performance and second-shell coordination atom of SACs.
研究领域:
催化
·
材料科学
·
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）