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Soluble Ultra-High Molecular Weight Poly(4,4′-Diphenylether-5,5′-Bibenzimidazole) Based Membranes with Remarkable Mechanical Strength and Specific Proton Conductivity for High Temperature Proton Exchange Membrane Fuel Cells

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SSRN 2023年

作者： Liu, Guoliang Wang, Ailian Ji, Wenxi Zhang, Longgui Wu, Jianing Zhang, Taoyi Tang, Haolin Zhang, Haining State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Nr. 122 Luoshi Rd. Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan528200 China Research Institute of Chemical Industry Co. Ltd Beijing100013 China Hubei Key Laboratory of Fuel Cell Technology Wuhan University of Technology Wuhan430070 China

Reducing the thickness of membrane electrolyte is one important direction to improve Ohmic polarization and the according performance of high-temperature proton exchange membrane fuel cells for its widespread applications. Herein, we report that robust thin membranes can be formed using a soluble ether-contained poly(4,4′-diphenylether-5,5′-bibenzimidazole) with an ultra-high molecular weight of 170 kDa. Due to the enhanced chain entanglement of high molecular weight polymers, the formed thin membrane exhibits promising mechanical strength, thermal and oxidation stability. The optimized membrane with thickness of 61 µm and phosphoric acid uptake of 606 wt.% has the high specific proton conductivity of 25.9 S cm-2 at 160 oC under anhydrous conditions and mechanical strength of 11.2 MPa. The accordingly fabricated membrane electrode assembly delivers a peak power density of 0.544 W cm-2 with the open circuit voltage of 0.915 V at 160 oC using air as oxidant, outperforming the value of 0.522 W cm-2 for the commercial membrane electrode assembly with thickness of 250 µm and phosphoric acid uptake of 1018 wt.%. © 2023, The Authors. All rights reserved.

关键词： Proton conductivity

Stable Cycling of High-Capacity Red Phosphorus/Carbon Composite Anode in All-Solid-state Lithium-Ion Batteries

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SSRN 2023年

作者： Sun, Han Liu, Dan Li, Jing Qu, Deyu Xie, Zhizhong Song, Jiangping Tang, Haolin Department of Chemistry School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology 122 Luoshi Road Wuhan430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China

Using the Li metal anode in all-solid-state batteries (ASSBs) is challenging than initially envisioned owing to poor thermodynamic stability against solid electrolytes. Therefore, it is imperative to develop Li-ion anode alternatives for the future practical implementation of high-energy ASSBs. Here, for the first time, we demonstrate the stable cycling of red phosphorus (P)-carbon composite as a low-cost and high-capacity anode in sulfide electrolyte-based ASSBs. By loading subnanometer-scaled red P clusters in the micropores of a commercial activated carbon (AC), the electrically insulating red P can be fully activated and operable in room-temperature ASSBs. Benefiting from its medium lithiation potential and fast Li+ diffusion capability, the resultant P@AC electrode enables a record-high current density of over 18 mA cm−2 without Li dendrite formation in a symmetric cell. In a half cell, the P@AC material with a red P content of 53 wt% can deliver a high first delithiation capacity of 1438 mAh g−1 at 0.2 A g−1 and a decent capacity retention of 66.9% after 400 cycles (running time of over 180 days). When paired with a LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode, the P@AC||NCM811 full cell achieves an initial areal capacity of 2.98 mAh cm−2 and enables stable cycling over 200 cycles. © 2023, The Authors. All rights reserved.

关键词： Activated carbon

Achieving Wideband Electromagnetic Wave Absorbing Performance for Pmma-Based Composites Foam by Designing the Alternating Directional (Ad) Microporous Structure

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SSRN 2023年

作者： Zhou, Danfeng Yu, Zirui Yuan, Huan Luo, Guoqiang Hu, Ruofei Jiang, Xueliang Shen, Qiang Hubei Key Laboratory of Plasma Chemistry and New Materials School of Material Science and Engineering Wuhan Institute of Technology Hubei Wuhan430205 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Automotive Engineering Wuhan University of Technology Wuhan430070 China Department of Food Science & Chemical Engineering Hubei University of Arts and Science Xiangyang441053 China

Good impedance matching and attenuation ability of electromagnetic wave absorbing (EMA) materials are required to broaden the effective absorbing bandwidth (EAB) and lower minimum reflection loss (RLmin), achieving high EMA performance. Here we report a PMMA- based composite foam with alternating and directional (AD) microporous structure with broadened EAB of 3.53 GHz (8.49-12.02 GHz) and lowers RLmin of -19.35 dB, was manufactured via the one-step physical constraint foaming technology. Structural studies reveal that the AD microporous structure can induce the CNTs oriented distribution to improve effective concentration of CNTs, achieving excellent impedance matching. Meanwhile, it can also generate a large number of parallel-plate capacitors among the multiple interfaces to promote interfacial polarization, including enhancement of multiple reflection and scattering of electromagnetic wave at the multiple interfaces, endowing composites foam with high attenuation ability. This study lays the foundation for rational design and synthesis of EMA materials for broadband EMA performance. © 2023, The Authors. All rights reserved.

关键词： Electromagnetic wave absorption

Preparation of Low Molecular Weight Sodium Alginate with High Biological Activity by Tempo-Mediated Oxidation

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SSRN 2024年

作者： Wang, Wenyuan Zhao, Xinxin Yan, Lisi Yang, Feng Yang, Jing Li, Binbin Wang, Xinyu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong L aboratory Xianhu hydrogen Valley Foshan528200 China Hainan Institute Wuhan University of Technology Sanya572000 China Biomedical Materials and Engineering Research Center of Hubei Province Wuhan University of Technology Wuhan430070 China School of Foreign Languages Wuhan University of Technology Wuhan430070 China Department of Stomatology Zhongnan Hospital of Wuhan University Wuhan430060 China

In this study, low molecular weight sodium alginate was prepared by oxidizing the alginate solution with TEMPO/NaBr/NaClO and explored its potential application in tissue engineering. FTIR, UV-vis and NMR showed that the chemical structure of sodium alginate was not significantly changed by oxidation. The results of GPC and quantitative tests on carboxyl and aldehyde groups showed that the molecular weight of oxidized sodium alginate decreased gradually (2058.97, 544.39, 164.89, 94.92 kDa) with the increase of the ratio of oxidizing agent NaClO to SA (0, 0.25, 1.00, 2.00 mmol/g), and the content of carboxyl groups increased slowly (2.48, 4.27, 4.57, 4.70 mmol/g), no aldehyde group was found in the product, which was consistent with the results of XRD and TGA detection. We speculate that when the TEMPO system oxidizes the non-specific hydroxyl groups on the sugar ring of sodium alginate, it will also destroy the 1-4 glycosidic bonds between the segments, and the aldehyde group only exists as an intermediate product. In addition, preliminary in vitro biodegradation and cell compatibility tests showed that sodium alginate has better degradation properties after oxidation and exhibited a better ability to promote L929 cell proliferation under high oxidation levels and low concentrations. © 2024, The Authors. All rights reserved.

关键词： Aldehydes

Effects of Alumina Modification on Curing Performance of Ceria-Stabilized Zirconia in Stereolithography

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SSRN 2024年

作者： Li, Zhi Wu, Jiaxin Luo, Jing Zhang, Bowen Li, Yue Cheng, Bo Yang, Jing Li, Binbin Wang, Xinyu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu hydrogen Valley Foshan528200 China Sanya Science and Education Innovation Park Wuhan University of Technology Sanya572000 China Biomedical Materials and Engineering Research Center of Hubei Province Wuhan University of Technology Wuhan430070 China School of Foreign Languages Wuhan University of Technology Wuhan430070 China Department of Stomatology Zhongnan Hospital of Wuhan University Wuhan430060 China

Ceria-stabilized zirconia has promising applications in the field of dental materials due to its mechanical and anti-aging properties. However, the fabrication of high-quality ceria-stabilized zirconia ceramics by stereolithography remains a significant challenge owing to the optical properties of ceria. This work aimed to overcome the lack of photopolymerization performance by utilizing alumina sol encapsulated in ceria-stabilized zirconia particles and generating an alumina layer in the ceria-stabilized zirconia particles through heat treatment, with the objective of reducing the absorbance of the ceria-stabilized zirconia slurry. The results indicated a reduction in the absorbance of the modified powder at 405 nm, decreasing from 0.2113 to 0.1384. Additionally, the Vickers hardness, elasticity moduli, flexural strength, and fracture toughness of the Al2O3/CeZrO2 ceramics were observed to be 10.43 ± 0.74 GPa, 231.5 ± 4.2 GPa, 701 ± 89 MPa and 9.74 ± 0.61 MPa·m1/2, respectively. The percentage of monoclinic phases and mechanical properties exhibited minimal variation before and after accelerated low-temperature degradation tests. This study illustrates that ceria-stabilized zirconia modified by alumina sols demonstrate favorable mechanical properties and LTD resistance. The findings may serve as a basis for optimizing the preparation of ceria-stabilized zirconia dental materials via stereolithography. © 2024, The Authors. All rights reserved.

关键词： Fracture toughness

In Situ Polysaccharide Based Double-Network Hydrogels as a Sustained Kartogenin Delivery System for Cartilage Tissue Engineering

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SSRN 2024年

作者： Fan, Yaohui Yan, Junyi Zhao, Xinxin Wang, Wenyuan Gao, Chihao Lin, Xiaoli Wang, Yu Cheng, Bo Yang, Jing Li, Binbin Wang, Xinyu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hainan Institute Wuhan University of Technology Sanya572000 China Foshan Xianhu Laboratory of the Advanced Energy Science Technology Guangdong Laboratory Xianhu hydrogen Valley Foshan528200 China Biomedical Materials and Engineering Research Center of Hubei Province Wuhan University of Technology Wuhan430070 China School of Foreign Languages Wuhan University of Technology Wuhan430070 China Department of Stomatology Zhongnan Hospital of Wuhan University Wuhan430060 China

In-situ forming, biodegradable hydrogel scaffolds are crucial in tissue engineering and drug delivery, and are widely used in articular cartilage (AC) repair. Hydrogels derived from polysaccharides are ideal materials for cartilage tissue engineering due to the similar components and structure between them and cartilage extracellular matrix (ECM). Here, we fabricated a double-network (DN) hydrogel composed of glycidyl methacrylate (GMA)-modified chitosan (GCS) and hyaluronic acid methacrylate with aldehyde groups (AHM) via Schiff base reaction and photocrosslinking. The drug-loaded hydrogel was formed by grafting the bioactive factor kartogenin (KGN) onto GCS (KGCS) and then gelation. Compared with the traditional hydrogels encapsulating the drug or drug combined with microspheres, it has stable and sustained release effect, the drug release ratio is lower and persistent. In addition, the physical and chemical properties of the two kinds of hydrogels with or without KGN were studied, including morphology, mechanical properties, swelling rate and in vitro degradation behavior. In order to examine the biocompatibility, BMSCs were encapsulated in hydrogels. The results showed that both hydrogels could provide an appropriate microenvironment and could promote the growth and proliferation of BMSCs, but the KGCS/AHM hydrogel was better. In summary, we prepared a KGN-conjugated polysaccharide DN hydrogel, which had a sustained and slowly release effect on KGN and supported cell growth and proliferation, with the potential for cartilage tissue engineering. © 2024, The Authors. All rights reserved.

关键词： Biocompatibility

Zn-doping enhances the photoluminescence and stability of PbS quantum dots for in vivo high-resolution imaging in the NIR-II window

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Nano Research 2020年第8期13卷 2239-2245页

作者： Xiulei Shi Song Chen Meng-Yao Luo Biao Huang Guozhen Zhang Ran Cui Mingxi Zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology430070WuhanChina Key Laboratory of Analytical Chemistry for Biology and Medicine(Ministry of Education) College of Chemistry and Molecular SciencesWuhan UniversityWuhan430072China iChEM(Collaborative Innovation Center of Chemistry for Energy Materials) Hefei National Laboratory for Physical Science at the MicroscaleUniversity of Science and Technology of ChinaHefei230026China

Lead sulfide(PbS)quantum dots(QDs)are important near infrared(NIR)luminescent materials with tunable and strong emission covering a broad NIR ***,their optical properties are quite sensitive to air,water,and high temperature due to the surface oxidation,thus limiting their applications in optoelectronic devices and biological ***,a cation-doping strategy is presented to make a series of high-quality Zn-doped PbS QDs with strong emission covering whole second near-infrared window(NIR-II,1,000-1,700 nm).First-principle calculations confirmed that Zn dopants formed dopant states and decreased the recombination energy gap of host ***,the Zn dopants significantly improved the quantum yield,photoluminescence lifetime and thermal stability of PbS ***,the PEGylated Zn-doped PbS QDs emitting in the NIR-llb window(1,500-1,700 nm)realized the noninvasive imaging of cerebral vascular of mouse with high resolution,being able to distinguish blood *** material not only provides a new tool for deep tissue fluorescence imaging,but is also promising for the development of other NIR related devices.

关键词： quantum dots doping second near-infrared window(NIR-II window) tunable emission in vivo imaging

Interfacial Covalent Bonding Coupled Ultrafine Cus-Nanocrystals/Mxene Heterostructure for Efficient and Durable Magnesium Storage

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SSRN 2023年

作者： Cheng, Zhi Xu, Yanan Zhang, Xudong Peng, Qifan Wang, Kai Zhang, Xiong Sun, Xianzhong An, Qinyou Mai, Liqiang Ma, Yanwei Institute of Electrical Engineering Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan Hubei430070 China School of Engineering Sciences University of Chinese Academy of Sciences Beijing100049 China School of Materials Science and Engineering Zhengzhou University Henan Zhengzhou450001 China

Rechargeable magnesium batteries (RMBs) hold great potential for large-scale energy storage due to the dendrite-free deposition and high theoretical volumetric capacity of magnesium anode. However, the sluggish kinetics and poor reversibility of cathodes hinders their development in terms of high capacity and long cycling stability. Herein, a confined in-situ growth strategy is presented to construct novel copper sulfide (CuS)/delaminated Ti3C2Tx MXene (d-Ti3C2Tx) heterostructure, where ultrafine CuS nanocrystals are tightly anchored on the d-Ti3C2Tx substrate through S–Ti–C interfacial covalent bonding. This strong interaction not only enhances the conductivity of CuS, enabling rapid charge transfer, but also effectively buffers the volume expansion of CuS during the charge/discharge process. As a result, the CuS/d-Ti3C2Tx heterojunction exhibited high reversible specific capacity (336.5 mAh g−1) and outstanding rate capability. Remarkably, an impressive long-term cycling performance with a stable capacity of 92.2 mAh g−1 at 1000 mA g−1 was achieved over 1000 cycles. This study demonstrates the feasibility of integrating CuS with d-Ti3C2Tx MXene and provides an avenue for designing high-performance cathode materials for RMBs. © 2023, The Authors. All rights reserved.

关键词： Sulfur compounds

A novel bifunctional oxygen electrode architecture enabled by heterostructures self-scaffolding for lithium–oxygen batteries

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Journal of Energy Chemistry 2020年第12期29卷 216-221页

作者： Liang Xiao Zhong Qin Jingyu Yi Haoyang Dong Jinping Liu School of Chemistry Chemical Engineering and Life ScienceWuhan University of Technology.Wuhan 430070HubeiChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina State Center for International Cooperation on Designer Low-Carbon&Environmental Materials and School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001HenanChina

In recent years, as one of the most promising chemical power sources for future society, lithium–oxygen (Li–O2) battery receives great attention due to its extremely high theoretical energy density of 3505 Wh kg^(–1)[1–4]. In practice, large polarization and consequent low energy efficiency currently still hinder the application of Li–O2batteries, which mainly results from the sluggish electrochemical reaction kinetics of oxygen diffusion electrodes in aprotic electrolytes [5]. On one hand, oxygen reduction reaction (ORR)in aprotic electrolytes is intrinsically sluggish due to the difficult charge transfer, the low solubility of oxygen.

关键词： Heterostructure Nanoarray architecture Bifunctional catalysis Oxygen diffusion electrode Lithium–oxygen batteries