FUEL
·
2023
·
IF 7.4
Dongao Zhu,Kun Zhu,Lixian Xu,Haiyan Huang,Jing He,Wenshuai Zhu,Huaming Li,Wei Jiang
N-hydroxyphthalimide (NHPI) is a powerful green nitrogen-containing free radical catalyst, while the leaching of homogeneous NHPI remains a crucial obstacle. Herein, the cobalt-based metal–organic frameworks (Co-based MOFs) were introduced as the supports and co-catalysts to successfully confine the NHPI catalyst. NH 3 -TPD characterization confirmed that the heterogeneous catalyst NHPI@Co-MOF containing carboxyl groups linker exhibits more assertive acidity, facilitating the activation of O 2 to generate active radicals O 2 •− that determined the catalytic activity . Owing to these features, NHPI@Co-MOF-DA with two carboxyl groups as the linker achieved 98 % of DBT conversion at 120 °C. Moreover, the DBT conversion of the used catalyst reached 95 % after being recycled 10 times. The distinctive design strategy provided valuable insights into the selection of suitable organic linkers to enhance the synergistic effect of metal cobalt with NHPI in the oxidative desulfurization (ODS) process, broadening the research horizon of MOF hybrids in the construction of efficient ODS applications.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Nan Lu,Bin Liu,Zhengxin Peng,Jing Sui,Xiaofan Zhang,Yuting Ma,Renhong Li,Xiaoqing Yan
Rational design and fabrication of catalysts with excellent efficiency, high selectivity and outstanding stability is of great significance for the practical application of formic acid dehydrogenation into hydrogen gas. Herein, Pd catalysts with a narrow size distribution around 2.2 nm are deposited on the porous chitosan microspheres, which are produced by the polycondensation with Schiff base linkage. The Pd–N bond configuration is formed upon the abundant amino-group on the chitosan backbone with the surface anchoring Pd nanocluster. The surface charge is redistributed to generate high-valence Pd δ+ species due to the ligand-to-metal charge transfer between Pd and N, thus greatly improving the catalytic performance of formic acid dehydrogenation at room temperature and maintaining outstanding stability during 15 consecutive reaction cycles. The present work paves the way to the rational synthesis of Pd-based catalysts with tunable electronic states for practical purposes.
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高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yuying Zhao,Qixin Yuan,Kang Sun,Ao Wang,Ruting Xu,Jing Xu,Yan Wang,Mengmeng Fan,Jianchun Jiang
Carbon material is considered a promising electrocatalyst for the CO2 reduction reaction (CO2RR); especially, N-doped carbon material shows high CO Faradic efficiency (FECO) when using pyridinic N species as the active site. However, in the past decade, more efforts were focused on the preparation of various carbon nanostructures containing abundant pyridinic N species and few researchers studied the electronic structure modulation of the pyridinic N site. The curvature of the carbon substrate is an easily controllable parameter for modulating the local electronic environment of catalytic sites. In this research, carbon nanotubes (CNTs) with different diameters are applied to modulate the electronic environment of pyridinic N by the curvature effect. The pyridinic N sites doped on CNTs with the average curvature of 0.04 show almost 100% FECO at the current density of 3 mA cm–2 at −0.6 V vs RHE and 91% FECO retention after 12 h test, which is superior to most of the carbon-based electrocatalysts. As demonstrated by density functional theory simulation, the pyridinic N site forms a strong local electric field around the nearby C active site and protrudes out of the curved CNT surface like a tip, which remarkably enriches the protons around the adsorbed CO2 molecule.
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DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 39
·395503
·
IF 3.5
Zhiwen Li,Zhilin Zhou,Jianghua Wang,Tingxian Tao,Yingqiang Fu
Carbon quantum dots (CQDs) have been extensively researched as fluorescent probes, but there are few reports on fluorescence-enhanced probes. Herein, nitrogen and sulfur co-doped CQDs (N, S-CQDs) with blue aggregation-induced emission enhancement (AIEE) fluorescence were synthesized by a one-step hydrothermal reaction. N, S-CQDs can rely on the presence of –OH, C=O, –NH2, and ether bonds on their surfaces and the formation of hydrogen bonds by ciprofloxacin (CIP) containing Ar-F and –COOH functional groups to achieve effective charge transfer. In addition, CIP forces N, S-CQDs to aggregate to form cross-linked structures, which effectively limits the vibration and rotation of N, S-CQDs, leading to enhanced fluorescence of N, S-CQDs. Based on the above intermolecular charge transfer and AIEE between N, S-CQDs and CIP, an efficient and sensitive nano fluorescent probe for the detection of CIP in real water samples was developed, which can achieve sensitive detection of 3.33 × 10−8–1.13 × 10−6 M CIP.
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PubMed
高影响因子
Aggregate
·
2023
·
IF 18.8
Xiao Chen,Lei Wang,Yan Gao,Yang Li,Xiaowei Zhang,Yu Jiang,Ge Wang
The photothermal conversion capacity of pristine organic phase change materials (PCMs) is inherently insufficient in solar energy utilization. To upgrade their photothermal conversion capacity, we developed bimetallic zeolitic imidazolate framework (ZIF) derived Co/N co-doped flower-like carbon (Co/N-FLC)-based composite PCMs toward solar energy harvesting. 3D interconnected carbon framework with low interfacial thermal resistance, abundant carbon defects and high content of nitrogen doping, excellent localized surface plasmon resonance (LSPR) effect of Co nanoparticles, and light absorber Co 3 ZnC in Co/N-FLC synergistically upgrade the photothermal capacity of (polyethylene glycol) PEG@Co/N-FLC composite PCMs with an ultrahigh photothermal conversion efficiency of 94.8% under 0.16 W/cm 2 . Uniformly anchored Co and Co 3 ZnC nanoparticles in carbon framework guarantee excellent photon capture ability. Bridging carbon nanotubes (CNTs) in 2D carbon nanosheets further accelerate the rapid transport of phonons by constructing cross-connected heat transfer paths. Additionally, PEG@Co/N-FLC exhibits a thermal energy storage density of 100.69 J/g and excellent thermal stability and durable reliability. Therefore, PEG@Co/N-FLC composite PCMs are promising candidates to accelerate the efficient utilization of solar energy.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Jinqi Wang,Chenxi Wang,Kai Hou,Xiaolong Su,Mugaanire Tendo Innocent,Zexu Hu,Senlong Yu,Hengxue Xiang,Meifang Zhu
Among all designated microwave absorbers, the combination of magnetic metal with carbon nanomaterials has been considered as one of the most effective ways for the absorption of electromagnetic wave (EMW). The incorporation of doped magnetic metal nanoparticles (NPs) with carbon nanomaterials provides excellent magnetic loss. Additionally, carbon matrix possesses tunable dielectric properties and designable microstructure which could further improving the performance of the EMW absorption. Herein, N-doped carbon nanofibers doped with CoNiSe 2 NPs was fabricated by electrospinning, carbonization and selenization process using for the EMW absorbers. The lowest reflection loss (RL) of −47.7 dB at the thickness of 2.1 mm while an effective absorption bandwidth (EAB) of 7.12 GHz at the thickness of 2.4 mm was achieved. The enhanced EMW attenuating properties can be attributed to the multiple EMW reflections, interfacial polarization between the fibers and magnetic loss facilitated by CoNiSe 2 NPs. This work provides a promising strategy for introducing multiple components to improve the EMW absorbing properties and can be potentially extended to the fabrication of other functional anti-electromagnetic materials.
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高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Enxiang Ren,Xing Zhang,Guo-Ping Lu,Muhammad Sohail,Jun Hu,Zhong Chen,Daidi Fan,Yamei Lin
The poor activity and specificity of nanozymes limit their applications in many fields owing to their low density of active sites, inhomogeneous atomic composition, and complex structure. To overcome these issues, a single iron-anchored carbon material, Fe/CN-800-A, with FeN2 sites has been fabricated, which exhibited exclusive oxidase-like activity. The mechanisms of N-coordination-number-regulated enzymatic activity and specificity of the composite were also explored to elaborate the working principle. The FeN2 sites in Fe/CN-800-A exhibited higher oxidase-like activity and specificity than the FeN4 sites in Fe/CN-700, owing to their lower energy barriers for O2 absorption and the decomposition of H2O2 into O2. These findings provide a theoretical basis for the rational design of nanozymes with high oxidase-like activity and specificity. The fabricated nanocomposites have commercial potential for effective chlorpyrifos detection and antibacterial applications due to their unique structural traits and high efficiency.
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高影响因子
Polymer Chemistry
·
2023
·Vol. 15
·期 2
·97-105
·
IF 4.6
Donghui Zhang,Shiqi Liu,Zhihao Cai,Weizhe Luo,Guojian Liu,Runhui Liu
Polypeptides are extensively used in the fields of biomedicine and biomaterials. The use of N-phenoxycarbonyl amino acids (NPCs) as monomers for polypeptide synthesis is an advanced method that offers the unique advantage of excellent monomer stability. However, the purification of NPC monomers previously required laborious column chromatography or recrystallization techniques, which might have restricted the widespread application of NPC polymerization. In this work, a straightforward and efficient method for synthesizing NPC monomers has been developed, enabling the production of products with high purity through a simple work-up process. This method is compatible with various amino acids, and the resulting monomers can undergo normal polymerization reactions. By significantly enhancing the availability of NPC monomers, this method facilitates the synthesis of polypeptides.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·
IF 3.9
Zhe Zhao,Cheng Han,Xiaozhou Wang,Yingde Wang
Metallopolymers containing refractory metal in the main chain are highly desired but rarely reported as oxygen-free single-source precursors for preparing ultrahigh-temperature ceramics. Herein, a novel single-source precursor of poly-hafnium-borocarbosilane (PHBCNS) with an Hf–N–B backbone molecular structure was synthesized through the dehalogenation reaction between HfCl 4 and B(NHCH 3 ) 3 . The polymeric Hf–N–B chain with large bond angle and conjugated molecular structure endowed the PHBCNS precursor to be relatively stable, dissolvable, and meltable. Subsequent precursor pyrolysis up to 1800°C resulted in an HfC/HfB 2 nanocomposite comprising an Hf content of 87.54 wt%, with the average grain size of HfC and HfB2 to be 34.9 and 74.1 nm, respectively. The ceramization mechanism and phase evolution from the PHBCNS precursor to HfC/HfB 2 composite ceramics were thoroughly investigated. This work not only highlights a novel Hf–N–B backbone polymer with high metal content and good shaping properties but also provides fresh insights of designing single-source precursors for ultrahigh-temperature composite ceramics.
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高影响因子
BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2023
·
IF 3.8
Zhong Linhan,Chen Ye,Wen Qing,Yang Yang
The focus of this study is to develop a high-performance anode material for microbial fuel cells (MFCs). PEDOT:PSS and nitrogen-modified MXene were combined to create a hydrogel composite material called PPNM, which was drop-cast onto carbon felt (CF) as the MFCs anode. The PPNM exhibited a higher peak power density of 4.78 W m −2 , an increase of 332% compared to the CF anode. It is worth noting that the PPNM Hydrogel maintains its rough and porous structure, providing favorable sites for bacterial colonization. The introduction of N-MXene has improved the electrochemical performance of the hydrogel, particularly impacting the mediated electron transfer process. Microbial community analysis revealed the presence of more electrochemically active species on the PPNM anode. These findings highlight the potential of PPNM hydrogel and pave the way for similar strategies in achieving high-performance anodes in MFCs.
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PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Shujing Liu,Pengshuo Fan,Ying Yao,Yinghao Chang,Dong Yang,Changchun Wang,Jia Guo
Two-dimensional (2D) covalent organic polymers (COPs) featuring large surface areas and exposed active sites are desirable in the modification of electrode materials for electrochemical reactions. However, the rigid and planar conformation of 2D COPs limits the wrap of one-dimensional electrodes. Herein, we have proposed a molecular strategy to regulate in situ encapsulation of carbon nanotubes (CNTs) with 2D polyphosphazene. The stoichiometric control over the nucleophilic substitution reaction between hexachlorocyclophosphazene and amines allows for the oriented evolution around the surface of CNTs. The formed COP sheath is an ultrathin and uniform coating without granular deposition. Upon carbonization, the well-defined core/shell CNT composite was converted into the N,P-codoped carbon, exhibiting outstanding electrocatalytic oxygen reduction performance with a diffusion-limiting current density of 5.4 mA cm–2 and an electron transfer number of 3.97. The improved electrocatalytic activity originates from a high content of active N,P-containing catalytic sites uniformly distributed on porous carbon. This study provides a viable strategy to develop functional composite materials by modulating the flexibility of 2D COPs for 1D substrates, contributing to broad applicability.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 48
·期 3
·1372-1380
·
IF 3.3
Peng Sun,Menglu Zhang,Yue Liu,Jiahua Zhao,Jiawei Yang,Yufeng Wang,Yongfei Wang,Zhiqiang Zhang
Lithium-ion batteries have been regarded as a promising power source for various electronic devices. Compared to the traditional graphite anode material, MoSe2 possesses a higher theoretical capacity. However, MoSe2 anode materials are limited by low electronic conductivity and large volume changes during cycling. This study reports 1T–2H MoSe2/N-doped rGO nanocomposites, fabricated through a hydrothermal method. The 1T–2H MoSe2/N-doped rGO electrode delivers a high reversible capacity of 483.6 mA h g−1 after 1000 cycles at 1000 mA g−1. It also possesses a high reversible capacity of 474.9 mA h g−1 even at a current density of 2000 mA g−1, thus, making it an important potential lithium-ion battery anode.
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高影响因子
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