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Membrane catalysts eliminate trace pollutants

Chem 2022年第6期8卷 1551-1553页

作者： Jing Li Xiao-Yu Yang Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials School of Chemistry and Chemical Engineering Wuhan University of Science and Technology Wuhan 430081 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & Shenzhen Research Institute & Joint Laboratory for Marine Advanced Materials in Pilot National Laboratory for Marine Science and Technology (Qingdao) Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China School of Engineering and Applied Sciences Harvard University Cambridge MA 02138 USA

The presence of residues in products generated by high-efficiency catalytic reactions is detrimental. In a recent work published in Nature Nanotechnology by Andrea Schäfer and colleagues, membrane catalysts are shown to promote processes while enhancing water purification by degradation of micropollutants via filtration-driven effective collision.

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Ultra-rapid hydrogen evolution reaction kinetics over CeO 2 @PtCu coaxial nanocables

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Nano Energy 2025年 142卷

作者： Feng Xu Qiaona Yang Zhen Xu Huafeng Le Tianhua Zhou Yifeng Wang Shichun Mu College of Materials Science and Engineering Fuzhou University Fuzhou 350108 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Pt-based catalysts with robust performance towards hydrogen evolution reaction in acidic media are urgently needed. The thin-layer structure can expose most active sites on surface and tune electronic structures of Pt-based catalysts. However, establishing the Pt thin-layer on support is challenging due to poor lattice compatibility and step-edge barriers to interlayer transport, which often results in roughening or sintering. Herein, we first coat Cu on CeO 2 nanowire using sol-gel method and then construct a PtCu thin-layer by a “glue” effect, achieving a coaxial nanocable structure CeO 2 NW@PtCu catalyst. Benefiting from the PtCu thin-layer structure and large metal-support interface, the electron density at Fermi level increases, and the charge transfer is facilitated, leading to a stronger metal-support interaction and a lower energy barrier for adsorption/desorption of H*. As expected, the catalyst exhibits an overpotential as low as 7 mV at a current density of 10 mA cm −2 , and a mass activity of 2.9 A mg −1 Pt , which is 72.5 times that of commercial Pt/C. Even after 2000 CV cycles, the structure and activity remain unchanged. This work demonstrates a promising strategy for improving the utilization efficiency and stability of Pt in HER and other catalytic reactions.

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Calcium-Magnesium Phosphate Biphasic Microspheres with Nutrient Microchannels Promote Angiogenesis and Osteogenic Differentiation

SSRN

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SSRN 2022年

作者： Hou, Wen Guo, Jiaxin Liu, Jiawei Zhao, Yanan Wei, Wenying Shu, Dan Dai, Honglian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Biomedical Materials and Engineering Research Center of Hubei Province Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China Shenzhen Research Institute of Wuhan University of Technology Shenzhen518000 China

Vascularisation and mineralisation are indispensable conditions for bone repair materials. The introduction of magnesium ions into calcium phosphate-based materials can give them angiogenic and mineralising capabilities. However, the optimum calcium to magnesium ratio has yet to be determined. Microspheres have received much attention from researchers due to their flexibility, non-agglomeration and other advantages. We prepared calcium-magnesium phosphate biphasic microspheres (CMBS) using the water-in-oil emulsion cross-linking method to achieve osteogenic differentiation and vascularisation. The simultaneous use of the sacrificial template method and heat treatment endow the microspheres with a rich micro-pore structure. In addition, we investigated the compounding ratio of calcium phosphate to magnesium phosphate and determined the optimal compounding ratio (Ca/Mg = 3/1-1/1) for this material. The prepared microspheres promoted the attachment, proliferation and directed differentiation of bone marrow mesenchymal stromal cells (BMSCs) and human umbilical vein cells (HUVECs). CMBS-I (Ca/Mg = 3/1) and CMBS-II (Ca/Mg = 1/1) microspheres showed the best promotion effect among all groups. These microspheres were implanted under the skin of Sprague- Dawley (SD) rats, and the composite microspheres significantly induced vascular regeneration compared to pure phase microspheres. © 2022, The Authors. All rights reserved.

关键词： Cell adhesion

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Macroscopic synthesis of ultrafine N–doped carbon nanofibers for superior capacitive energy storage

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Science Bulletin 2019年第21期64卷 1617-1624页

作者： Qiang Yu Jianshuai Lv Zhenhui Liu Ming Xu Wei Yang Kwadwo Asare Owusu Liqiang Mai Dongyuan Zhao Liang Zhou State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China International School of Materials Saence and Engineering Wuhan University of TechnologyWuhan 430070China

Carbon nanofibers(CNFs)with excellent electric conductivity and high surface area have attracted immense research interests in ***,the macroscopic production of CNFs still remains a great ***,ultrafine N–doped CNFs(N–CNFs)with a diameter of$20 nm are synthesized through a simple and scalable sol-gel method based on the self-assembly of phenolic resin and cetyltrimethylammonium *** employed in aqueous supercapacitors,the obtained activated N–CNFs manifest a high gravimetric/areal capacitance(380 Fg-1/1.7 Fcm-2)as well as outstanding rate capability and cycling ***,the activated N–CNFs also demonstrate excellent capacitive performance(330 Fg-1)in flexible quasi-solid-state *** remarkable electrochemical performance as well as the easy and scalable synthesis makes the N–CNFs a highly promising electrode material for supercapacitors.

关键词： Macroscopic synthesis Carbon Nanofibers N–doping Supercapacitor

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An efficient bifunctional electrocatalyst derived from layer-by-layer self-assembly of a three-dimensional porous Co-N-C@graphene

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Science Bulletin 2019年第14期64卷 968-975页

作者： Shichang Cai Rui Wang William M. Yourey Junsheng Li Haining Zhang Haolin Tang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China College of Engineering Penn State University Hazleton PA 18202 USA

Three-dimensional (3D) porous carbon-based materials with tunable composition and microstructure are of great interest for the development of oxygen involved electrocatalytic reactions. Here, we report the synthesis of 3D porous carbon-based electrocatalyst by self-assembling Co-metal organic frameworks (MOF) building blocks on graphene via a layer-by-layer technique. Precise control of the structure and morphology is achieved by varying the MOF layer to tune the electrocatalytic properties. The as-produced electrocatalyst exhibits an excellent catalytic activity for the oxygen reduction reaction in 0.1molL^-1 KOH, showing a high onset potential of 0.963V vs. reversible hydrogen electrode (RHE) and a low tafel slope of 54mVdec^-1, compared to Pt/C (0.934V and 52mVdec^-1, respectively). Additionally, it shows a slightly lower potential vs. RHE (1.72V) than RuO2 (1.75V) at 10mAcm^-2 in an alkaline electrolyte. A rechargeable Zn-air battery based on the as-produced 3D porous catalyst demonstrates a high peak power density of 119mWcm^-2 at a cell voltage of 0.578V while retaining an excellent stability over 250 charge-discharge cycles.

关键词： Oxygen reduction reaction Cobalt Three-dimensional Oxygen evolution reaction Graphene

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Optical phonon dominated heat transport: A first-principles thermal conductivity study of BaSnS2

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Physical Review B 2021年第24期104卷 245209-245209页

作者： Zhi Li Hongyao Xie Shiqiang Hao Yi Xia Xianli Su Mercouri G. Kanatzidis Christopher Wolverton Xinfeng Tang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Chemistry Northwestern University Evanston Illinois 60201 USA Department of Materials Science and Engineering Northwestern University Evanston Illinois 60208 USA

Acoustic phonons with long mean free paths have long been believed to control the lattice thermal conductivity κL in solids dominantly. In this study, however, we demonstrate an optical phonon dominated κL in BaSnS2. By solving the Peierls-Boltzmann transport equation, we predict a low diagonal lattice thermal conductivity κL(D) of 0.34Wm−1K−1 at 850 K, which is less than half the κL(D) of SnS at the same temperature. Further calculations following the Allen-Feldman model suggest the additional off-diagonal lattice thermal conductivity κL(OD) contributed by wavelike tunneling phonons. The κL(OD) becomes pronounced at the high temperature (0.17Wm−1K−1 at 850 K) and leads to a deviation of the temperature dependence of κL from T–1 to T–0.76, suggesting the potential lattice anharmonicity in BaSnS2. Further analyses indicate BaSnS2 has over 68% of κL contributed by optical phonons. We show this uncommon optical phonon dominated κL is due to the relatively high group velocities of optical phonons in BaSnS2. The phonon mode visualization suggests these relatively high-velocity optical phonons correspond to the antiphase vibrations in BaSnS2 monolayers, which is originated from the unique permutation of SnS3 tetrahedra. Finally, by investigating the mode-resolved group velocity, relaxation time, and Grüneisen parameter, we attribute the intrinsic low κL of BaSnS2 to the soft lattice and the relatively high lattice anharmonicity induced by the Ba-S weak bonding and Sn(II) lone-pair electrons. Our study explicitly analyzes the microscopic mechanism of optical phonon dominated heat transport in BaSnS2 and suggests it worthy of further experimental studies as an intrinsic low-κL material.

关键词： Chemical bonding Heat transfer Lattice dynamics Optical phonons Thermal conductivity

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Tristate Ferroelectric Memory Effect Attained by Tailoring the Ferroelectric Behavior in Bi1/2(Na0.8k0.2)Tio3 with EU Doping

SSRN

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SSRN 2022年

作者： Hu, Yang Zhang, Huazhang Zhoua, Jing Shen, Jie Chen, Binbin Li, Ang Chen, Wen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Physics School of Sciences Wuhan University of Technology Wuhan430070 China Sanya Science and Education Innovation Park of Wuhan University of Technology Sanya572025 China

The ferroelectric behavior of Bi1/2(Na0.8K0.2)1/2TiO3 (BNKT) relaxor has been tailored by Eu3+ doping and the intermediate relaxor state has been utilized for tristate ferroelectric memory effect. With the increase of the Eu3+ content, the electric field-induced long-range ferroelectric order is gradually disrupted. The P-E loops gradually become pinched and double-like, indicating that intermediate relaxor state appears during the polarization reversal. The disruption of ferroelectric order by Eu3+ doping is also manifested in the dielectric and piezoelectric properties, and structurally, in XRD patterns and PL spectra. In the series of Eu3+ doped BNKT, we find that the composition with the Eu3+ doping content of 3.0% would be suitable for tristate ferroelectric memory effect, in which two ferroelectric states with upward and downward polarizations and a middle relaxor state are served as the "+1", "−1" and "0" memory states, respectively. Verification experiment shows that the write and read of all the three states are feasible, with a reasonably good retention ability. Moreover, the luminescence property imparted by the dopant ion Eu3+ and its sensitivity to local structural symmetry also imply a potential possibility for non-destructive optical readout. © 2022, The Authors. All rights reserved.

关键词： Ferroelectricity

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Single-Atom Engineering of Covalent Organic Framework for Photocatalytic H2 Production Coupled with Benzylamine Oxidation

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Small 2023年第35期19卷

作者： Xia, Yang Zhu, Bicheng Li, Liuyi Ho, Wingkei Wu, Jinsong Chen, Haoming Yu, Jiaguo The Education University of Hong Kong Tai Po New Territories 999077 Hong Kong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Laboratory of Solar Fuel Faculty of Materials Science and Chemistry China University of Geosciences 388 Lumo Road Wuhan430074 China Key Laboratory of Eco-materials Advanced Technology College of Materials Science and Engineering Fuzhou University New Campus Fujian Minhou350108 China State Key Laboratory of Marine Pollution City University of Hong Kong Tat Chee Avenue Kowloon999077 Hong Kong Department of Chemistry National Taiwan University Taipei10617 Taiwan

In photocatalysis, reducing the exciton binding energy and boosting the conversion of excitons into free charge carriers are vital to enhance photocatalytic activity. This work presents a facile strategy of engineering Pt single atoms on a 2D hydrazone-based covalent organic framework (TCOF) to promote H2 production coupled with selective oxidation of benzylamine. The optimised TCOF-Pt SA photocatalyst with 3 wt% Pt single atom exhibited superior performance to TCOF and TCOF-supported Pt nanoparticle catalysts. The production rates of H2 and N-benzylidenebenzylamine over TCOF-Pt SA3 are 12.6 and 10.9 times higher than those over TCOF, respectively. Empirical characterisation and theoretical simulation showed that the atomically dispersed Pt is stabilised on the TCOF support through the coordinated N1-Pt-C2 sites, thereby induing the local polarization and improving the dielectric constant to reach the low exciton binding energy. These phenomena led to the promotion of exciton dissociation into electrons and holes and the acceleration of the separation and transport of photoexcited charge carriers from bulk to the surface. This work provides new insights into the regulation of exciton effect for the design of advanced polymer photocatalysts. © 2023 Wiley-VCH GmbH.

关键词： Oxidation

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Superelastic Carbonaceous Nanofibrous Aerogel Enables High Pressure-Sensitivity, Thermal Insulation and Photothermal Properties

SSRN

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SSRN 2022年

作者： Wan, Fuqiang Wei, Jingjiang Zhu, Chenglong Liu, Yin Ping, Hang Xie, Hao Wang, Hao Wang, Weimin Fu, Zhengyi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Luoshi Road No. 122 Wuhan430070 China School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Luoshi Road No. 122 Wuhan430070 China

Carbonaceous aerogels attract extensive research interest due to their impressive physical properties such as high porosity, high electrical conductivity, low thermal conductivity, and low density. However, the low durability of the aerogels under compression is a concern due to the intrinsically weakness. In this work, superelastic, multimodal porous, carbonaceous nanofibrous aerogel (CAs) were prepared by carbonizing chitin aerogels (ChAs). The ChAs were prepared and structurally optimized by combining progressive typical dissolution–regeneration, solvent exchange with 50 wt% tert -butanol and lyophilization. The CAs exhibited remarkable elasticity and stability under compression, even under extreme temperatures. After the CAs had been subjected to loading-and-unloading cycle under the compressive strain ( ɛ ) of 50%, the CAs exhibited a very low energy-loss coefficient (0.15) at the first cycle. Moreover, the CAs maintained structural integrity with little deterioration of mechanical properties after 1000 cycles. The structural stability and the superelasticity conferred the CAs a fast and accurate piezoresistive response, which renders it potential for the fabrication of pressure sensor with a high gauge factor (GF, 14.24) under low ɛ (less than 2%). Furthermore, the biomass derived cost-efficient CAs demonstrated excellent thermal insulation and high photothermal-conversion efficiency of solar energy (96.4%). © 2022, The Authors. All rights reserved.

关键词： Thermal insulation

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Hollow Multishelled Structure: synthesis Chemistry and Application

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Chemical Research in Chinese Universities 2024年第3期40卷 346-393页

作者： MAO Dan WANG Chao LI Wei ZHOU Liang LIU Jian ZHENG Zjian ZHAO Yong CAO An-min WANG Shutao HUANG Jiaxing HUO Fengwei CHEN Hongyu MAI Liqiang YU Ranbo WANG Lianzhou LU Yunfeng YU Chengzhong YANG Qihua YANG Zhenzhong ZENG Hua Chun ZHAO Hujun TANG Zhiyong ZHAO Dongyuan WANG Dan State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChineseAcademy of SciencesBeijing 100190P.R.China Key Laboratory of Biopharmaceutical Preparation and Delivery Chinese Academy of SciencesBejing 100190P.R.China School of Fashion and Textiles The Hong Kong Polytechnic UniversityHong Kong SARP.R.China Department of Chemistry Fudan UniversityShanghai 200433P.R.China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070P.R.China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023P.R.China School of Chemistry Beihang UniversityBejing 100191P.R.China CAS Key Laboratory of Molecular Nanostructure and Nanotechnology and Beijing National Laboratory for Molecular Sciences Institute of ChemistryChinese Academy of SciencesBeijing 100190P.R.China CAS Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190P.R.China School of Engineering Westlake UniversityHangzhou 310024P.R.China School of Flexible Electronics(Future Technologies) Nanjing Tech UniversityNanjing 211816P.R.China School of Science Westlake UniversityHangzhou 310024P.R.China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070P.R.China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083P.R.China School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbaneQueensland 4072Australia College of Life Science and Technology Bejing University of Chemical TechnologyBejing 100029P.R.China School of Chemistry and Molecular Engineering East China Normal UniversityShanghai 200241P.R.China College of Life Sciences Zhejiang Normal UniversityJinhua 321004P.R.China Department of Chemical Engineering Tsinghua UniversityBeijing 100

Hollow multishelled structure(HoMS),a promising and complex multifunctional structural system,features at least two shells that are separated by internal *** unique structure endows it with numerous advantages including low density,high loading capacity,large specific surface area,facilitated mass transport,and multiple spatial confinement *** the past twenty years,benefiting from the booming development of synthesis methods,various HoMS materials have been prepared and show promising applications in diverse areas.

关键词： Hollow multishelled structure synthesis chemistry Energy storage Catalysis Electromagnetic wave absorption Drug delivery Sensor

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