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Synthesis, Structure, and Magnetism of a Rhombic Metallocycle

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SSRN 2023年

作者： Wu, Zhi-Yan Chen, Ting Huang, Min Nan, Zi-Ang Liao, Jin-Sheng Zhuo, Zhu Huang, You-Gui School of Material and Chemistry Engineering Jiangxi University of Science and Technology Jiangxi Ganzhou341000 China CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research The Structure of Matter Chinese Academy of Sciences China Xiamen Institute of Rare Earth Materials Haixi Institutes Chinese Academy of Sciences Xiamen361021 China

A rhombic metallocycle [CoII6Cl6(L‒H+)2(L‒2H+)2]·6DMF·6H2O (1) (L = tris(2-naphthimidazolylmethyl) amine) composed of two CoIICl(L‒H+) moieties and two CoIICl(L‒2H+) moieties alternately bridged by two μ3-CoII ions has been synthesized under solvothermal condition. Each metallocycle associate with its six neighbors through intermolecular π···π interactions between naphthimidazolylmethyl arms forming a supramolecular framework with a distorted pcu network. Magnetic measurements on the metallocycle reveal dominant antiferromagnetic couplings between CoII centers. © 2023, The Authors. All rights reserved.

关键词： Supramolecular chemistry

Synthesis, Structure and Electrocatalytic Activity of Perfluorinated Covalent Triazine-based Framework

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Chinese Journal of Structural Chemistry 2019年第2期38卷 233-241,166页

作者： WANG Yuan-Shuang WEN Zhen-Hai CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences

Using the bottom-up method, we synthesized a series of perfluorinated covalent triazine-based frameworks(FCTFs) with porous structures for catalysis oxygen reduction reaction(ORR). The evolved FCTFs by high-temperature carbonization show an apparent variation in electrocatalytic activity toward the ORR dependent on the type of F. The samples synthesized at 900 ℃(FCTF-900) exhibits advantages in terms of high activity, high durability, and methanol-tolerant as an efficient electrocatalyst for ORR, manifests a comparable or even better activity as compared with the commercial Pt/C catalysts not only in alkaline media but also in acidic and neutral electrolyte.

关键词： electrochemical reduction porous polymers covalent triazine-based framework ionothermal polymerization

Controllable Dispersion of Cobalt Phthalocyanine Molecules on Graphene Oxide for Enhanced Photocatalytic Co2 Reduction

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SSRN 2023年

作者： Li, Junqiang Huang, Weifeng Wang, Zhuoyue Xu, Xiao Sun, Miao Kang, Longtian Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research The Structure of Matter Chinese Academy of Sciences Fujian Fuzhou350002 China College of Chemistry Fuzhou University Fuzhou350116 China Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fujian Fuzhou350108 China University Chinese Academy of Science Fujian College Fuzhou350002 China

The carbon-based materials with metal-N-C active sites have been widely studied on the electrocatalysis for CO2 reduction reaction (CO2RR), however, they were investigated a few for the photocatalytic CO2RR. Here, cobalt phthalocyanine (CoPc) molecules with intrinsic Co-N4-C moiety are successfully dispersed on graphene oxide (GO) as the CO2RR photocatalyst. The morphology, structure, and component of CoPc/GO composites with the different ratio of GO to CoPc are systematically characterized, confirming the existence of Co-O-C axial coordination bond between CoPc and GO. The optical, photoelectric, and electrical properties of CoPc/GO composites are carefully investigated, indicating their synergistic role of CoPc and GO in photocatalysis. With the optimal CoPc/GO sample as photocatalyst, the evolution rate of ~1500 μmol g-1 h-1 and a ~ 85% selectivity of CO and CH4 can be achieved, which is much higher than those of CoPc. After the reduction of CoPc/GO to CoPc/rGO, the rate of CO2RR to CO and CH4 is reduced to 916 μmol g-1 h-1, indicating the important role of Co-O-C axial bond in the CO2RR. This work provides a simple way to prepare the single-molecule catalyst for CO2RR. © 2023, The Authors. All rights reserved.

关键词： Catalysts

Influence of Poly(Ethyleneimine) functionalized Carbon Nanotubes on Mechanical and Tribological Behavior of Epoxy Resins

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SSRN 2022年

作者： Liu, Ming Hou, Dongyang Wu, Lixin School of Mechanical Engineering and Automation Fuzhou University Qishan Campus Fujian Fuzhou350116 China CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fujian Fuzhou350002 China

Epoxy-based nanocomposites were prepared with the addition of poly(ethyleneimine) (PEI, an amine-riched polymer) functionalized multi-walled carbon nanotubes (MWCNTs), whose microstructure was characterized by TEM and FTIR spectra. Effects of PEI-functionalized MWCNTs (PEI-MWCNTs) on micromechanical properties of nanocomposites were characterized by instrumented indentation with Berkovich indenter and microscratch test with Rockwell C indenter. With the increase in the content of PEI-MWCNTs: both nanoindentation hardness and elastic modulus of nanocomposites increase;scratch normal hardness and elastic recovery rate decrease in an approximately linear way;fracture toughness obtained by scratch-based linear elastic fracture mechanics increase in an approximately linear way. © 2022, The Authors. All rights reserved.

关键词： Wear of materials

Construction of Z-Scheme Photocatalyst with P-N Heterojunction of Molecular Semiconductors for Enhanced Photocatalytic Water Oxidation

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SSRN 2023年

作者： Li, Junqiang Wang, Shoufeng Li, Renfu Zhang, Bo Xu, Xiao Wang, Zhuoyue Kang, Longtian Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fujian Fuzhou350002 China Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fujian Fuzhou350108 China University Chinese Academy of Science Fujian College Fuzhou350002 China College of Chemistry Fuzhou University Fuzhou350116 China

Here, the donor-acceptor organic composites of n-type perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) and p-type cobalt phthalocyanine (CoPc) semiconductors are firstly synthesized and optimized for photocatalytic oxygen evolution (POE) as catalyst. The POE rate of 12.30 mmol·g-1·h-1 with the apparent quantum yield of 4.00% at 475 nm can be achieved under visible light (> 420 nm), as compared with 1.58 mmol.g-1.h-1 of PTCDA. Under the full UV-Vis light (> 320 nm), the rate is up to 17.65 mmol·g-1·h-1. The systematical experiments clearly reveal the generation of dual-channel energy transfer of fluorescence resonance from CoPc to PTCDA and electron transfer from oxygen groups in PTCDA to Co atom in CoPc under UV-Vis light irradiation. Consequently, the formation of Z-scheme p/n heterojunction in CoPc/PTCDA composite greatly enhances the POE performance due to the lifetime increase of metal-ligand charge transfer exciton in CoPc (44.83 vs. 2.95 ps) and perylene cationic exciton (20.13 vs. 2.13 ps). © 2023, The Authors. All rights reserved.

关键词： Heterojunctions

Multiplexed intracellular detection based on dual-excitation/dualemission upconversion nanoprobes

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Nano Research 2020年第7期13卷 1955-1961页

作者： Jianxi Ke Shan Lu Zhuo Li Xiaoying Shang Xingjun Li Renfu Li Datao Tu Zhuo Chen Xueyuan Chen CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China University of Chinese Academy of Sciences Beijing 100049China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China

Multiplexed intracellular detection is desirable in biomedical sciences for its higher eficiency and accuracy compared to the single-analyte ***,it is very challenging to construct nanoprobes that possess multiple fluorescent signals to recognize the different intracellular species ***,we proposed a novel dual-excitation/dual-emission upconversion strategy for multiplexed detection through the design of upconversion nanoparticles(UCNP)loaded with two dyes for sensitization and quenching of the upconversion luminescence(UCL),*** on the two independent energy transfer processes of near-infrared(NIR)dye IR845 to UCNP and UCNP to visible dye PAPS-Zn,CIO-and Zn2+were simultaneously detected with a limit of detection(LOD)of41.4 and 10.5 nM,*** tilizing a purpose built 830/980 nm dual-laser confocal microscope,both intrinsic and exogenous CIO and Zn2+in live MCF-7 cells have been accurately *** dual-excitation/dual-emission ratiometric UCL detection mode enables not only monitoring multiple intracellular analytes but also eliminating the detection deviation caused by inhomogeneous probe distribution in *** modulation of NIR dye and visible dye with other reactive groups,the nanoprobes can be extended to analyze various intraellular species,which provides a promising tool to study the biological activities in live cells and diagnose diseases.

关键词： upconversion nanoparticles energy transfer dual-excitation dye sensitization ratiometric probe multiplexed detection

Controllabledispersion of Cobalt Phthalocyanine Molecules on Graphene Oxide for Enhanced Photocatalytic Co2 Reduction

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SSRN 2023年

作者： Li, Junqiang Huang, Weifeng Wang, Zhuoyue Sun, Miao Xu, Xiao Kang, Longtian Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research The Structure of Matter Chinese Academy of Sciences Fujian Fuzhou350002 China College of Chemistry Fuzhou University Fuzhou350116 China Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fujian Fuzhou350108 China University Chinese Academy of Science Fujian College Fuzhou350002 China

关键词： Catalysts

Construction of Cobalt Porphyrin-Modified Cu2o Nanowires Array as a Tandem Electrocatalyst for Enhanced Co2 Reduction to C2 Products

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SSRN 2023年

作者： Min, Shihao Xu, Xiao He, Jiaxin Sun, Miao Lin, Wenlie Kang, Longtian Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research The Structure of Matter Chinese Academy of Sciences Fujian Fuzhou350002 China College of Chemistry Fuzhou University Fuzhou350116 China Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fujian Fuzhou350108 China University Chinese Academy of Science Fujian College Fuzhou350002 China

Here, the molecule-modified Cu-based array is firstly constructed as the self-supporting tandem catalyst for electrocatalytic CO2 reduction reaction (CO2RR) to C2 products. The modification of cuprous oxide nanowires array on copper mesh (Cu2O@CM) with cobalt(II) tetraphenylporphyrin (CoTPP) molecules is achieved via a simple solution method. The systematical characterizations confirm that the formation of axial coordinated Cu-O-Co bond between Cu2O and CoTPP significantly promotes the CoTPP dispersion on Cu2O and the electrical properties of CoTPP-Cu2O@CM heterojunction array. Consequently, as compared to Cu2O@CM array, the optimized CoTPP/Cu2O@CM as electrocatalyst can realize the 2.08-fold C2 Faraday efficiency (73.2% vs. 35.2%) and 2.54-fold current density (‒52.9 vs. ‒20.8 mA·cm–2) at ‒1.1 V vs. RHE in H-cell. The comprehensive performance is superior to reported Cu-based materials in H-cell. Further study reveals that the CoTPP adsorption on Cu2O can restrain the hydrogen evolution reaction, improve *CO intermediates and keep Cu+ at low potential. © 2023, The Authors. All rights reserved.

关键词： Copper oxides

Covalent organic frameworks derived hollow structured N-doped noble carbon for asymmetric-electrolyte Zn-air battery

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Science China Chemistry 2019年第3期62卷 385-392页

作者： Pingwei Cai Xinxin Peng Junheng Huang Jingchun Jia Xiang Hu Zhenhai Wen CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences University of Chinese Academy of Science

We report a relatively low-temperature molten salt strategy to prepare hollow structured N-doped noble carbon(h-NNC) with highly desirable features of ultra-large surface area(1957 m^2 g^(-1)) and high graphitization, endowing the h-NNC with high activity toward catalysis of oxygen reduction reaction in acidic medium. The h-NNC is applied as cathode catalyst of an asymmetrical-electrolyte Zn-air battery, which exhibits an open circuit voltage of 2.11 V, a power density up to 270 mW cm^(-2),and an energy density of 1279 W h kg^(-1), behaving advantages over the conventional Zn-air batteries.

关键词： noble carbon oxygen reduction reaction asymmetric-electrolyte Zn-air battery energy density