NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 36
·15396-15402
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IF 3.288
Lina Zhang,Min Zhang,Libin Liu,Yanqin Wang,Jing Zheng,Jingli Xu
Decoration of transition metal Ni nanoparticles (NPs) on magnetic supports is of special interest for histine-rich protein adsorption. Through a combination of a hydrothermal reaction, a mussel-inspired coating and a carbonization strategy, we have investigated two synthetic paths to access hierarchical nickel-based magnetic nanostructures: (1) Fe3O4 spheres are covered with hierarchical NiMoO4 nanosheets and subsequently coated with a polydopamine (PDA) layer, and Fe3O4@MoO2∩C–Ni composites are synthesized after pyrolysis in a nitrogen atmosphere, and (2) Fe3O4 spheres are coated with PDA and subsequently covered with hierarchical NiMoO4 nanosheets, and then Fe3O4@C∩MoO2–Ni composites are obtained after pyrolysis in a nitrogen atmosphere. We find that only route 1, which can be defined as a space-confined carbonization strategy, results in the formation of a high coverage of nickel NPs with tiny diameter decorated on Fe3O4 spheres. Route 2, defined as a non-space-confined carbonization strategy, leads to the formation of low density and large size Ni NPs. Detailed examination of the nickel-based magnetic composites obtained by route 1 displayed superior adsorption capacity for BHb than that of route 2. The results demonstrated that the space-confined strategy is greatly beneficial for the synthesis of Ni-based magnetic composites with high coverage, which would pave a novel way for synthesizing high density Ni-based magnetic composites.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
Journal of Materials Chemistry A
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2022
·Vol. 10
·期 39
·21093-21101
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IF 14.511
Jun-Peng Wang,Chuhan Fu,Zehua Wu,Hao Lan,Siwen Cui,Tao Qi
Functions of extreme stretchability, ultrahigh tensile strength, high-level conductivity and self-healing capacity endow polymer-based soft electronics with enhanced reliability and prolonged lifespan in deformable applications. However, it is still a huge challenge to achieve such a performance portfolio in individual electronic systems because ultrahigh strength is hardly compatible with self-healing ability in polymers. Herein, a hydrogen-bonded nanoconfinement strategy is proposed to synthesize supertough self-healing polyurethane (TSPU). The hierarchical hydrogen bonds, slight covalent crosslinking and rigid nanoconfinement phases result in self-healing polymers with super stretchability and ultrahigh strength. Self-healing soft electrodes were fabricated possessing the above functions simultaneously with the TSPU polymer as the supporting layer on which a eutectic gallium–indium (EGaIn) liquid metal is spread. By means of the dynamic nanoconfinement strategy, the soft electrodes showed a break elongation of ca. 2500% and a tensile strength of ca. 50 MPa, and 200 000 times its own weight could be lifted up. Remarkably, the resistance of the soft conductor only changed a little even at 2000% strain illustrating an outstanding conductive reliability. The ultrahigh strength, extreme ductility and high reliability bring self-healing electronics to a new high level. Such self-healing soft electronic devices could find promising potential in heavy-duty deformable electronic applications.
研究领域:
材料科学
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软体电子学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Gang Yang,Yan Yang,Yan Li,Fangxiang Song,Qianlin Chen
Lower voltage window and limited pseudocapacitive active sites are identified as critical impediments hindering the advancement of nickel-based supercapacitors. Herein, a double-confined strategy involving nanosizing and heterointerfaces is proposed to construct nickel-based sulfide composite (PMO@NiS 2 /Ni 0.96 S@C) with abundant oxygen vacancies (O V ), sulfur vacancies (S V ), and heterostructures. The composite was prepared using liquid-phase in situ self-assembly and low-temperature in situ induction techniques. The double-confined structure and the introduction of vacancies can effectively expose the pseudocapacitive active sites and improve the operating voltage window range of nickel nanosulfides to enhance pseudocapacitive performance. It is determined that anions and cations in the electrolyte are collectively implicated in the energy storage process. Meanwhile, electrochemical quasi-in situ XPS, in situ electrochemical quartz crystal microbalance (EQCM), and theoretical calculations based on density functional theory (DFT) were utilized to verify the energy storage mechanisms of anions and cations in the electrolyte. Furthermore, a pseudocapacitive reaction mechanism for the composites is proposed, which encompasses a novel charge storage coupling effect between the surface redox reaction of the electrolyte anions and the intercalation/de-intercalation of the electrolyte cations at the interlayer and heterointerface. Consequently, the (PMO@NiS 2 /Ni 0.96 S@C) electrode achieves 1807 C/g (6 M KOH, 0.25 A/g) under the working potential window of −0.8 ∼ 0.5 V. The assembled symmetric supercapacitor demonstrates a specific potential of 2 V, yielding an energy density of 96 Wh kg −1 at a power density of 300 W kg −1 . This work provides a theoretical reference for designing nickel-based compound materials with high energy density.
研究领域:
材料科学
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电化学
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DOI
PubMed
高影响因子
CARBON
·
2022
·
IF 11.307
Yongqian Shen,Fan Zhang,Yuchen Zhang,Pengfei Song,Feng Gao,Dong Zhang,Chunli Liu,Jiqiang Ma,Huixia Feng,Xueyan Du
Advanced microwave absorbers (MAs) containing magnetic particles and carbon nanofibers (CNFs) have raised widespread attention in the rapid popularization of electronic communication equipment. However, it is quite challenging to control the growth of magnetic particles in CNFs to improve electromagnetic waves (EMWs) loss and attenuation. Herein, a novel space-confined strategy was adopted to develop Co/CoO/SiO 2 /CNFs, in which Co/CoO nanoparticles (NPs) with single domain size and dispersed distribution could achieve enhanced magnetic loss and dielectric loss. The introduction of nano-SiO 2 in the system could enhance the dielectric confinement effect of the nanofibers (NFs), while an interfacial confinement network could also be constructed to realize the refinement of Co/CoO NPs, enhance the electromagnetic (EM) loss, and ultimately ameliorate the microwave absorption performance of as-obtained NFs. When the additive amount of nano-SiO 2 in the spinning solution was 1.0 mg, the as-prepared Co/CoO/SiO 2 /CNFs reached the optimal reflection loss (RL) of −52.9 dB at 12.64 GHz with a thickness of 2.5 mm, and the effective bandwidth (EBW) reached 5.67 GHz (10.46–16.13 GHz). Furthermore, the excellent hydrophobic properties of the CNFs endow them with potential self-cleaning function. The confinement strategy proposed in this work lays a foundation for the design of low-filling ratio and high-performance CNFs-based microwave absorbers, and presents a general approach for the synthesis of one-dimensional composite materials with controllable structures.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2020
·Vol. 8
·期 19
·9545-9553
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IF 11.301
Tianhang Gu,Wei Teng,Nan Bai,Zehan Chen,Jianwei Fan,Wei-xian Zhang,Dongyuan Zhao
Bimetals have attracted considerable attention as electrocatalysts towards selective reduction of nitrate to benign dinitrogen. Design of highly efficient and stable bimetallic catalysts by taking the effects of both active sites increasing and synergistic composition into account is of paramount importance but still a grand challenge. Herein we report novel bimetallic Pd–Cu nanoparticles (NPs) incorporated in porous N-doped carbon octahedra prepared by a spatial confinement strategy of in situ pyrolysis of metal–organic frameworks with the assistance of polyvinyl pyrrolidone (PVP) as electrocatalysts achieving targeted denitrification. Pd–Cu NPs exhibit superior dispersity with a N-doped matrix and are strongly dependent on the variation of PVP, Pd precursor and pyrolysis temperature. The material shows high efficiency (∼97.1%) for the reduction of nitrate from 100 to 2.9 mg NO3−-N L−1 (well below drinking water standards of 10 mg NO3−-N L−1), and especially the selectivity over 83% for benign N2 at neutral pH within 24 h. Encapsulated and well-dispersed Pd–Cu NPs and doped N in the carbonaceous matrix synergistically enhance the interfacial electron transfer for transformation of NO3−-N(V). Porous structures endow the catalyst with outstanding stability after eight cycles and over a wide pH of 4–10. More importantly, the nanocatalyst performs well with real contaminated water (selectivity of 91% for nitrogen) in laboratory batch reactors. This nanocatalyst shows promise in wastewater treatment and environmental remediation due to the spatial confinement strategy and introduction of heterogeneous atoms.
研究领域:
环境科学
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材料科学
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电催化
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
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2025
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IF 5.7
Shengyuan Liang,Junjie Wang,Dunyan Jiang,Lijun Wang,Shikuo Li
Designing rational and lightweight magnetic-dielectric composites for efficient electromagnetic wave absorption remains a significant challenge. Herein, the FeCoNi metal-induced nitrogen-doped carbon nanotubes (FeCoNi@NCNTs) were synthesized though unique nanoconfinement strategy during carbon thermal reduction reaction. In confined environment, sufficient conditions were provided for the multidimensional growth of nanostructures. The mechanisms of carbon nanotube growth and electromagnetic wave absorption were further investigated. The FeCoNi@NCNTs exhibited a minimum reflection loss of -59.5 dB within the 2–18 GHz frequency range. Moreover, the composite achieved a minimum effective absorption bandwidth of 5.3 GHz at 2.0 mm. This work provides a new insight for preparing various magnetic-dielectric composites with rich absorption effects and broadband microwave absorption.
研究领域:
材料科学
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电磁学
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2020
·
IF 8.247
Danke Chen,Jiapeng Ji,Zhongqing Jiang,Min Ling,Zhongjie Jiang,Xinsheng Peng
Transition metal-nitrogen-carbon (M/N/C) catalysts, Fe/N/C in particular, with low cost, good tolerance to methanol and promising activity has great potential to replace Pt-based catalysts in oxygen reduction reaction (ORR). However, for metal atoms are easy to migrate and agglomerate during pyrolysis , it still remains a challenge to rationally design precursors to synthesize highly active M/N/C without significant agglomeration of metal sites. In this work, we propose a molecular-confinement strategy to synthesize sub-nano Fe/N/C catalysts by confinement [Fe(CN) 6 ] 3- in zeolitic imidazolate framework-8 (ZIF-8) crystals to minimize the agglomeration of Fe atoms during pyrolysis . The half-wave potential of the prepared sub-nano Fe/N/C is 40 mV superior to that of commercial 20% Pt/C in alkaline medium . Besides, it has electron transfer number close to 4.00, with below 0.5% H 2 O 2 yield, excellent long-term stability with only −5 mV shifts after 10000 cycles, and superb methanol tolerance. When utilized in Zn-air batteries as the cathode, it exhibits better activity, stability, and higher specific capacity than that of Pt–RuO 2 /C, showing a good potential for air cathode.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 6
·e202102642
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IF 9.14
Lingling Zheng,Yingji Zhao,Hongjuan Zhang,Wei Xia,Jing Tang
Graphical There's no space : Highly dispersed Fe−N x anchored on concave N-doped carbon is synthesized by space-confined strategy. The resulting NC@Fe−N−C exhibits superior oxygen reduction activity, originating from the combination of intrinsic activity and acceleration of mass electron transfer. Carbon-based electrocatalysts with atomically dispersed Fe−N−C display promising performance for oxygen reduction reaction (ORR) amongst non-precious electrocatalysts. Nonetheless, increasing the number and utilization of Fe−N−C active sites is challenging. Designing morphologies and adjusting the pore structure of carbon-based electrocatalysts would boost the mass transfer, enhance the utilization of the active sites, and increase the overall ORR performance. In this work, a concave N-doped carbon cubes structure adorned with highly external Fe−N x was designed and produced by the space-confined induced strategy. The optimal electrocatalyst revealed excellent ORR activity in both alkaline and acidic electrolytes, with half-wave potentials of 0.86 and 0.75 V, respectively. The superior performance arose from its unique concave structure, possessing more accessible active sites with improved intrinsic activity, which holds promising potential for preparing advanced ORR electrocatalysts.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Zhenyu Chen,Jia Liu,Bin Yang,Mingjie Lin,Costas Molochas,Panagiotis Tsiakaras,Peikang Shen
Intermetallic ordered PtCo is effective for high oxygen reduction reaction (ORR) activity and stability. However, preparing small-sized, highly ordered PtM alloys is still challenging. Herein, we report a controlled two-stage confinement strategy, in which highly ordered PtCoZn/NC nanoparticles of 5.3 nm size were prepared in a scalable process. The contradiction between the high ordering degree with the small particle size as well as the atomic migration with the space confinement was well resolved. An outstanding PEMFC performance was achieved for L1 0 -PtCoZn/NC with a high mass activity (MA) of 1.21 A/mg Pt at 0.9 V iR-free , 80.1 % MA retention after 30 k cycles in H 2 -O 2 operation, and a high mass-specific power density of 8.24 W mg -1 Pt in H 2 -Air operation with a slight loss of cell voltage@0.8 A cm −2 of 28 mV after 30 k cycles. The high performance can be ascribed to the high Pt area exposure, the enhanced Pt-Co coupling, and the prevented agglomeration in the mesoporous carbon wall. Overall, this strategy may contribute to the commercialization of fuel cells.
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2022
·
IF 10.53
Guoxiu Wang,Yonglei Chen,Congjie Pan,Hongli Chen,Sanyuan Ding,Xingguo Chen
Owing to their high specific surface area , tunable pore sizes, excellent chemical/thermal stability and ability to allow easy modification of the nature of the surface, covalent organic frameworks (COFs) have shown great promise in membrane separation . However, until now, rapid preparation of self-standing COFs membrane has still been a great challenge. In this work, a polyethylene glycol-assisted space-confined strategy for rapid and simple synthesis of imine-linked self-standing COF (TB-DA COF) membranes was developed for the first time. By using this strategy, the molecular organic building unit 1,3,5-tri-(4-aminophenyl)benzene (TB) is confined in a thin layer of polyethylene glycol in conjunction with molecular organic building unit 2,5-dimethoxyterephthalaldehyde (DA). Therefore, the condensation reaction between TB and DA can occur directly without slow diffusion process. In addition, the amorphous-to-crystalline interconversion process can be completed rapidly. Based on this, the imine-based TB-DA COF membrane with high crystallinity can be synthesized within 2 min, which has been the fastest strategy for preparation of COFs membrane to date. The synthesized TB-DA COF 2 membrane showed an excellent rejection (>96%) for dye molecules. This work opens a new fabrication route for COF-based membranes.
研究领域:
材料科学
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膜分离技术
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DOI
高影响因子
Chem Catalysis
·
2023
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IF 9.4
Bin Sun,Xiaoli Wang,Zaiqi Li,Hongli Liu,Weiyi Jiang,Kepeng Song,Zeyan Wang,Peng Wang,Yuanyuan Liu,Zhaoke Zheng,Ying Dai,Baibiao Huang,Hefeng Cheng
Synthesis of high-loading single-atom catalysts (SACs) with unique coordination structures, especially those p -block main group metals (e.g., In, Sn), to realize electrocatalytic CO 2 reduction reaction (CO 2 RR) with high performance remains a challenge. Here, we report a complex-confinement strategy to prepare In–O 2 N 2 and In–O 4 SACs on hollow mesoporous nitrogen-doped carbon, with a loading amount as high as 13.02 wt% and 9.89 wt%, respectively. In–O 2 N 2 SACs outperform In–O 4 SACs in CO 2 RR toward formate production, reaching a high selectivity (95.5%) and partial current density of formate (−58.2 mA cm −2 ). In situ Raman spectroscopy shows that In–O 2 N 2 SACs have a sole ∗OCHO intermediate for formate product, whereas both ∗OCHO and ∗COOH intermediates are observed in In–O 4 SACs. Computational calculations elucidate that coordination environment matters greatly in the electronic structure manipulation of In SACs, where a closer position of p -band center to the Fermi level enables In–O 2 N 2 SACs to bind and activate CO 2 molecules more favorably.
研究领域:
催化化学
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材料科学
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电化学
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环境科学
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能源化学
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纳米材料
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理论计算化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Shiqiang Wang,Yali Cao,Wei Jia,Zhenjiang Lu,Dianzeng Jia
Electrochemical water splitting has been highly considered as a promising technology to produce hydrogen with high purity and large quantity. Herein, a cage-confinement strategy is proposed to encapsulate H 3 PMo 12 O 40 clusters into cavities of ZIF-67. The ZIF-67 with cavity diameter of 1.16 nm and cavity window of 0.34 nm can appropriately confine H 3 PMo 12 O 40 with diameter of 1.0 nm. The H 3 PMo 12 O 40 served as guest species were also homogeneously encapsulated in well-defined cavities of ZIF-67 host without destroying the structure of ZIF-67. This cage-confinement strategy endow Mo 6 Co 6 C nanoparticles uniformly embedded in carbon matrix without aggregation and exposed abundant active sites during pyrolysis process. Furthermore, the heterojunction of Pt-Mo 6 Co 6 C was fabricated through galvanic replacement with H 2 PtCl 6 . The prepared Pt-PMo/ZIF-67-800 electrocatalyst with a low Pt amount of 3.0 % exhibits excellent HER activity and stability and even superior to commercial Pt/C in PH-universal solutions. Density functional theory (DFT) calculation reveals that Pt-Mo 6 Co 6 C heterostructure results in a lower hydrogen adsorption free energy than commercial Pt/C and thus enhances its intrinsic catalytic activity. The outstanding HER performance of Pt-Mo 6 Co 6 C heterostructure confined on dodecahedron carbon matrix opens new perspectives for rational design polyoxometalate (POM) based catalyst for hydrogen evolution.
研究领域:
材料科学
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电化学
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催化
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可再生能源
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）