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Microporous and Grain-Sized design of High-Yield Porous Carbon Materials by Using Potassium Acetate and P-Phenylenediamine

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SSRN 2023年

作者： Shen, Zhongrong Cheng, Lin Zhang, Kai Nie, Qiaojun Wang, Gang Cai, Xiaokang Zhang, Ming Liu, Chao College of Chemistry Fuzhou University Fuzhou350108 China CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Key Laboratory of Nanomaterials Fujian Institute of Research The Structure of Matter Chinese Academy of Sciences Fuzhou350002 China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth Materials Haixi Institute Chinese Academy of Sciences Xiamen361021 China Xiamen Tungsten Co. Ltd Xiamen361009 China

Porous carbon with large specific surface area (SSA) and high porosity is an ideal electrode material for supercapacitors. However, the traditional KOH activation remains several barriers, such as low yield, high corrosion, and pollution. In this paper, nitrogen-doped (1.68% N content) porous carbon (C-PKAC1.5) with high yield (26.3%), large SSA (2820.65 m2/g) and uniform size was prepared from p-phenylenediamine (PDA) in one-pot by using potassium acetate (KAc) instead of KOH. Throughout the process, KAc played the vital roles: 1) KAc could form hydrogen bonding network with PDA and mixed homogeneously, while PDA providing nitrogen dopant and carbon source. 2) After polymerization, the KAc lamellae reconstituted and achieved geometric partition of polymer matrix, left diffusion micro-tunnels and provided homogenized size of carbon particles at the following stage. 3) During activation, KAc melt and diffused into polymer matrix through micro-tunnels and converted to K2CO3 to activate from inside to outside, while avoiding the low yield for conventional activation from outside to inside. The supercapacitor assembled for C-PKAC1.5 exhibits high specific capacitance of 25.17 F/g and 82.77% of capacitance retention after 30,000 cycles, and achieves a high energy density of 8.29 Wh/L at a power density of 199.25 W/L. © 2023, The Authors. All rights reserved.

关键词： Supercapacitor

Broadband NIR photon upconversion generates NIR persistent luminescence for bioimaging

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arXiv

arXiv 2024年

作者： Yang, Shuting Qi, Bing Sun, Mingzi Dai, Wenjing Miao, Ziyun Zheng, Wei Huang, Bolong Wang, Jie The Key Lab of Health Chemistry & Molecular Diagnosis of Suzhou College of Chemistry Chemical Engineering & Materials Science Soochow University Suzhou215123 China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Key Laboratory of Nanomaterials State Key Laboratory of Structural Chemistry Fujian Institute of Research the Structure of Matter Chinese Academy of Sciences Fujian Fuzhou350002 China

Upconversion persistent luminescence (UCPL) phosphors that can be directly charged by near-infrared (NIR) light have gained considerable attention due to their promising applications ranging from photonics to biomedicine. However, current lanthanide-based UCPL phosphors show small absorption cross-sections and low upconversion charging efficiency. The development of UCPL phosphors faces challenges of lacking flexible upconversion charging pathways and poor design flexibility. Herein, we discovered a new lattice defect-mediated broadband photon upconversion process and the accompanied NIR-to-NIR UCPL in Cr-doped zinc gallate nanoparticles. The zinc gallate nanoparticles can be directly activated by broadband NIR light in the 700-1000 nm range to produce persistent luminescence at about 700 nm, which is also readily enhanced by rationally tailoring the lattice defects in the phosphors. This proposed UCPL phosphors achieved a signal-to-background ratio of over 200 in bioimaging by efficiently avoiding interference from autofluorescence and light scattering. Our findings reported the lattice defect-mediated photon upconversion for the first time, which significantly expanded the horizons for the flexible design of NIR-to-NIR UCPL phosphors toward broad applications. Copyright © 2024, The Authors. All rights reserved.

关键词： Bioimaging

Metal-Organic Framework-Derived Heterostructural Bi-Sm2o3 as a Novel Sulfur Immobilizer for High-Performance Lithium-Sulfur Batteries

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SSRN 2023年

作者： Lai, Xiaoxu Chen, Qiujie Wang, Haodong Chen, Chengwei Chen, Zifang Chen, Chi Sun, Dan 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 Fujian Fuzhou350002 China College of Chemistry and Materials Fujian Normal University Fujian Fuzhou350007 China Xiamen Institute of Rare Earth Materials Haixi Institutes Chinese Academy of Sciences Xiamen361021 China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen361021 China

Owing to their high theoretical energy density, low cost, and eco-friendliness, lithium-sulfur (Li-S) batteries are one of the most promising alternatives to Li-ion batteries. However, the commercialization of Li-S batteries has been hampered by their rapid capacity fading and poor cycling lifetime due to the shuttling and sluggish redox kinetics of polysulfides (LiPSs). To address these issues, functionalizing a commercial separator is a simple and effective strategy. In this study, we developed a novel modified polypropylene separator coated with samarium-based metal-organic framework-derived heterostructural bi-phased Sm2O3 (Bi-Sm2O3), which contains cubic Sm2O3 (C-Sm2O3) and monoclinic Sm2O3 (M-Sm2O3) phase in a single polycrystalline particle. The alleviated "shuttle effect" of LiPSs can be achieved by synergistic effect at the Bi-Sm2O3 surface through strong adsorption of LiPSs on M-Sm2O3 surface followed by catalytic conversion over C-Sm2O3. An optimized Bi-Sm2O3-modified separator with a thickness of 150 µm can enable the Li-S battery to deliver an improved cycling and rate performance with a high specific capacity of 860.1 mAh g−1 at 2 C and a low decay rate of 0.11% per cycle over 500 cycles at 1 C. © 2023, The Authors. All rights reserved.

关键词： Separators

Electromagnetic Interference between Multiple Quantum Mechanical Domains in Electronic Devices 4

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Electromagnetic Interference between Multiple Quantum Mechan...

4th International Applied Computational Electromagnetics Society Symposium in China, ACES-China 2021

作者： Meng, Lingyi Yam, Chiyung Chen, Quan 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 Fujian Fuzhou350002 China Beijing Computational Science Research Center Beijing100193 China School of Microelectronics Southern University of Science and Technology Shenzhen518055 China

ISBN: (纸本)9781733509619

We study the electromagnetic interference between active components in complicated electronic structures. In our simulations, dynamic behaviors of these active components with detailed atom configurations are described by the first-principles methods, while the entire system is modeled by a novel coupled quantum mechanics and electromagnetics (QM/EM) in the real time domain. We demonstrate that electronic devices could be treated independently in the sense of classical electromagnetics below a particular operational frequency (e.g. 10 THz). Our time-domain QM/EM simulations could also quantitatively describe the dependency of electromagnetic interference on the separating distance between devices. The relationships between induction current and separating distance are compared at different operational frequencies. © 2021 Applied Computational Electromagnetics Society (ACES).

关键词： Signal interference

Multiple Strategies from Apparatus to Synthetic Process Toward High-Performance Spherical Manganese Hexacyanoferrate for Sodium-Ion Batteries

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SSRN 2024年

作者： Zheng, Jun Wang, Gang Zhang, Kai Zheng, Jiafan Fu, Wenwu Zhang, Chengyu Liu, Jiayi Wang, Jieyuan Li, Junwei Cai, Fu Huang, Wenbo Zhang, Ming Shen, Zhongrong 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 Fuzhou350002 China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth Materials Haixi Institutes Chinese Academy of Sciences Xiamen361021 China College of Chemistry and Materials Science Fujian Normal University Fuzhou350007 China University of Chinese Academy of Sciences Beijing101408 China Xiamen 3-circles Battery Co. Ltd Xiamen361023 China

Traditional cube Prussian blue analogs with limited processability and low density are not suitable for the fabrication of high energy density sodium-ion batteries. Here, we present a novel reactor called the dual-vortexed coprecipitation chamber (DVCC) and a corresponding click reaction mechanism for producing high-density, size-controllable, spherical and low-deficiency manganese-based Prussian blue analogs. Through the optimized controlled crystallization precipitation technique, we are able to precisely regulate the nucleation, crystallization and spherical agglomeration process. In comparison to cubic crystals, our unique spherical particles exhibited superior performance with a controllable size distribution of 0 ~ 40 μm, compacted density of 1.60 g cm-3, an initial capacity of 132.5 mAh g-1 and notably retention rates of 99.5% for coin cell and 86.7% for pouch cell respectively after 500 cycles at 1 C rate. Benefit by the low H2O content (less than 300 ppm) in the electrodes, the pouch cell avoided gas expansion and also demonstrated excellent fast discharge capability with a retention of 78.7% at a maximum rate of 40C compared to 1C rate. © 2024, The Authors. All rights reserved.

关键词： Metal ions

"Chameleon-like" optical behavior of lanthanide-doped fluoride nanoplates for multilevel anti-counterfeiting applications

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Nano Research 2019年第6期12卷 1417-1422页

作者： Wenwu You Datao Tu Renfu Li Wei Zheng 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

Lanthanide-based luminescent anti-counterfeiting materials are widely used in various kinds of ***,the emission color of traditional lanthanide-based luminescent materials usually remains nearly unaltered upon different excitation lights,which may only work for single-level ***,the NaYbF4∶2%Er@NaYF4 core/shell nanoplates (NPs) with "chameleon-like" optical behavior are *** NPs display single-band red or green downshifting (DS) emission upon excitation at 377 or 490 nm,*** 980 nm excitation,the color of upconversion (UC) emission can be finely tuned from green to yellow,and to red with increasing the excitation power density from 0.1 to 4.0 W/cm^*** proposed materials readily integrate the advantages of excitation wavelength-dependent DS single-band emissions and sensitive excitation power-dependent UC multicolor emissions in one and the same material,which has never been reported ***,the proposed NPs exhibit excellent performance as security labels on trademark tag and security ink on painting,thus revealing the great potential of these lanthanide-doped fluoride NPs in multilevel anti-counterfeiting applications.

关键词： lanthanide-doped chameleon-like upconversion downshifting multilevel anti-counterfeiting

A Linear Ce^(Ⅲ) Complex Based on in-situ Generated N-hydroxy-1,8-naphthalenedicarboximide

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Chinese Journal of Structural Chemistry 2021年第11期40卷 1475-1481,1407页

作者： LIU Yang CAO Xue-Li WANG Wei LI Guo-Ling LI Shun HUANG You-Gui College of Chemistry Fuzhou UniversityFuzhou 350108China CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Xiamen Institute of Rare Earth Materials Haixi InstitutesChinese Academy of SciencesXiamen 361021China

A Ce^(Ⅲ) linear complex of N-hydroxy-1,8-naphthalenedicarboximide(HL)has been synthesized with acenaphthoquinone dioxime(acndH_(2))under solvothermal conditions,in which L is generated by a series of in-situ reactions starting from acndH2.X-ray crystallography reveals the coordination chains of Ce^(Ⅲ) ions are assembled into a 3D supramolecular framework viaπ···π*** title complex has been characterized by IR and UV-Vis spectra and thermogravimetric analysis(TGA).Furthermore,the fluorescent properties study demonstrated a ligand-based emission of the Ce^(Ⅲ) complex with~6 nm blue-shift compared with the emisision of the HL ligand.

关键词： N-hydroxy-1,8-naphthalenedicarboximide acenaphthoquinone dioxime rare earth fluorescence complex X-ray crystallography

Direct Z-Scheme Heterostructure of In Situ Planted ZnO Nanorods on g-C3N4 Thin Sheets Sprayed on TiO2 Layer: A Strategy for Ternary-Photoanode Engineering toward Enhanced Photoelectrochemical Water Splitting

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ACS Applied Energy Materials 2024年第3期7卷 906-918页

作者： Aboubakr, Ahmed Esmail A. Hussien, Mahmoud Kamal Sabbah, Amr Hassan, Ahmed E. Elsayed, Mohamed Hammad Wen, Zhenhai Chen, Kuei-Hsien Hung, Chen-Hsiung Sustainable Chemical Science and Technology Taiwan International Graduate Program Academia Sinica Taipei11529 Taiwan Department of Applied Chemistry National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Institute of Chemistry Academia Sinica 128 Sec 2 Academia Rd. Taipei11529 Taiwan Department of Chemistry Faculty of Science Assiut University Assiut71516 Egypt Center for Condensed Matter Sciences National Taiwan University Taipei10617 Taiwan Tabbin Institute for Metallurgical Studies Tabbin Helwan 109 Cairo11421 Egypt 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 University of Chinese Academy of Sciences Beijing100049 China Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Department of Chemistry Faculty of Science Al-Azhar University Cairo11884 Egypt

In this study, we developed an approach to enhance the separation and transfer of charge carriers for photoelectrochemical water splitting in solar-driven hydrogen production. We achieved this by designing a highly efficient Z-scheme TiO2/g-C3N4/ZnO photoanode. The process involved electrodepositing a thin TiO2 layer on FTO and optimizing the in situ ZnO implantation onto g-C3N4. These composites were confirmed by XRD, SEM, EDX, and TEM measurements. The growth of ZnO on g-C3N4 resulted in strong chemical adhesion between the interface of ZnO and g-C3N4, as supported by XPS data, and increased active surface area, as demonstrated by BET. The composition of ZnO and g-C3N4 facilitated rapid charge separation and retarded change recombination through directional charge migration and decreased charge resistance, as evidenced by PEIS and TRPL measurements. Our airbrushing procedure for fabricating the g-C3N4/ZnO composite on TiO2 also enhanced the charge collection efficiency, enabling us to construct a high-performance photoanode. The Z-scheme-type charge migration route was verified by EPR spectroscopy by trapping the radicals generated by charges and holes. PEC-WS measurements showed that TiO2/g-C3N4/ZnO heterostructure improved the produced photocurrent by about 160-, 40-, 20-, 8-, 2-, and 2-fold, relative to pristine g-C3N4, pristine ZnO nanorods, ZnO/g-C3N4 composite, pristine TiO2, TiO2/ZnO, and TiO2/g-C3N4, respectively, versus reversible hydrogen electrode (RHE) at 1.23 V. The charge carriers’ separation and injection measurements showed that the fabrication of this ternary photoanode remarkably improved the PEC-WS performance. DFT results contributed to a deeper understanding of the mechanism of the photocatalytic process and confirmed that the as-fabricated ternary heterojunction promoted the separation/transfer efficiency of the photogenerated charge carriers, thereby promoting the activity of the photocatalytic process. This work could pave the way for bette

关键词： Zinc oxide

Self-Healing Perovskite Solar Cells Based on Copolymer-Templated Tio2 with Copper Indium Disulfide as the Hole Transport Layer

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SSRN 2022年

作者： Lalpour, Nakisa Mirkhani, Valiollah Keshavarzi, Reza Moghadam, Majid Tangestaninejad, Shahram Mohammadpoor-Baltork, Iraj Gao, Peng Department of Chemistry Catalysis Division University of Isfahan Isfahan81746-73441 Iran 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 Fujian Fuzhou350002 China

Inorganic hole-transport materials (HTMs) such as copper indium disulfide (CIS) have been applied in perovskite solar cells (PSCs) to improve the poor stability of the conventional Spiro-based PSCs. However, the main drawback of CIS-PSCs is their lower efficiency compared with Spiro-PSCs. In this work, copolymer-templated TiO2 (CT-TiO2) structures have been used as an electron transfer layer (ETL) to improve the photocurrent density and efficiency of CIS-PSCs. Compared to the conventional random porous TiO2 ETLs, copolymer-templated TiO2 ETLs with a lower refractive index improve the transmittance of input light into the cell and therefore enhance the photovoltaic performance. Interestingly, a large number of surface hydroxyl groups on the CT-TiO2 induce a self-healing effect in perovskite. Thus, they provide superior stability in CIS-PSC. The fabricated CIS-PSC presents a conversion efficiency of 11.27% and a high photocurrent density of around 23 mA/cm2. Moreover, these unsealed CIS-PSCs retained 100% of their performance after aging tests for 90 days under ambient conditions and even increased from 11.08 to 11.27 over time due to self-healing properties. © 2022, The Authors. All rights reserved.

关键词： Sulfur compounds