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Influence of the content of ZrxAlyCz on properties of ZrB2-ZrxAlyCz Composite Ceramics Fabricated by Spark Plasma Sintering

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IOP Conference Series: materials Science and Engineering 2019年第1期678卷

作者： Qilong Guo Jianli Pang Jizhong Gan LI Junguo Lianmeng Zhang Key Laboratory of New Building Materials and Building Energy Efficiency of Gansu Province School of Civil Engineering Northwest Minzu University Lanzhou 730124 P. R. China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China

ZrB2/ZrxAlyCz composite ceramics with different volume contents of ZrxAlyCz were fabricated by the spark plasma sintering. The sintering behavior, microstructure, mechanical properties and oxidation resistance were studied. The results indicated that sinterability of the composites was remarkably improved by addition of ZrxAlyCz compared to the single-phase ZrB2 ceramic. As the content of ZrxAlyCz increased, both the Vickers hardness and Young's modulus of the composites first increased and then decreased. The fracture toughness of the ZrB2-40vol% ZrxAlyCz composite was 3.56 MPam1/2, which increased by approximately 70% compared to the monolithic ZrB2 ceramic. As increasing the content of ZrxAlyCz, the oxidation resistance of composite ceramics was obviously enhanced. The oxidation-resulted increase in weight of composite ceramic with 20vol% ZrxAlyCz was the best performance in oxidation resistance at 1500 °C. The high-temperature oxidation resulted in dense and stable Al-B-O glass due to adding ZrxAlyCz into the composite ceramics, those resulting products effectively blocked the oxygen atoms entering into the ceramic matrix.

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Ammonium Ion Batteries: material, Electrochemistry and Strategy

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Angewandte Chemie 2023年第23期135卷

作者： Runtian Zheng Yuhang Li Dr. Haoxiang Yu Xikun Zhang Dr. Ding Yang Dr. Lei Yan Prof. Yu Li Prof. Jie Shu Prof. Bao-Lian Su School of Materials Science and Chemical Engineering Ningbo University Ningbo 315211 Zhejiang China Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles 5000 Namur Belgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China

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Calcination-regulated Microstructures of Donor-Acceptor Polymers towards Enhanced and Stable Photocatalytic H2O2Production in Pure Water

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Angewandte Chemie 2022年第39期134卷

作者： Chao Yang Sijie Wan Dr. Bicheng Zhu Prof. Jiaguo Yu Prof. Shaowen Cao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 P. R. China Laboratory of Solar Fuel Faculty of Materials Science and Chemistry China University of Geosciences 388 Lumo Road Wuhan 430074 P. R. China

Regulating molecular structure of donor-acceptor (D-A) polymer is a promising strategy to improve photoactivity. Herein, a porous nanorod-like D-A polymer is synthesized via a strategy of supramolecular chemistry combined with subsequent calcination treatment. This polymer consists of benzene rings (D) and triazine (A) that are linked by amido bond (−CONH−). −CONH− further partially cracks into cyano groups (−C≡N) (A) under calcination. The ratio of benzene to triazine could be tuned to adjust the −C≡N content by varying the calcination atmosphere. Such regulation of molecular structure could modulate the band structure of D-A polymer and endow it with unique porous nanorod-like morphology, leading to the achievement of two-electron oxygen reduction and two-electron water oxidation and the improvement of exciton splitting, O 2 adsorption and activation. These merits synergistically ensure a highly efficient and stable photocatalytic H 2 O 2 production in pure water.

关键词： Donor-Acceptor Polymer H2O2 Microstructure Regulation Photocatalytic ORR Reaction Pathway

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Non-invasive flexible sensor based on liquid metal for human physiological detection

Next Nanotechnology

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Next Nanotechnology 2024年 5卷

作者： Zixuan Guo Gengcheng Liao Long Ren Hui Qiao Zongyu Huang Ziyu Wang Xiang Qi Hunan Key Laboratory for Micro-Nano Energy Materials and Devices and School of Physics and Optoelectronic Xiangtan University Hunan 411105 PR China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and Engineering Wuhan University of Technology Hubei 430000 PR China Suzhou Institute of Wuhan University Suzhou 215125 PR China

Flexible sensors play an important role in simulation, brain-computer interaction, intelligent robots, and biological detection. Due to the progress of modern medical means, the construction of wearable flexible sensors to realize remote and continuous monitoring of human physical indicators and physiological parameters has become a hot research topic. Non-invasive sensor is a device that can detect physiological parameters without cutting the skin or puncturing the body. They have wide application prospects in the fields of medical treatment, fitness, and daily care due to the following advantages: real-time monitoring, portability, accuracy, and cost reduction. Liquid metal has become a great candidate for constructing flexible biosensors because of its high conductivity, deformability, self-healing, and bio-friendly properties, its spontaneous formation of an oxide film due to exposure to oxygen provides a convenient reaction platform for the preparation of other materials. Two-dimensional materials are inherently superior in preparing sensors due to their great advantages unique chemical and physical properties, their high surface area-to-volume ratios and ultra-high surface sensitivity to the environment also can be used to prepare flexible sensor. This study presents an overview and introduction of biosensors fabricated by liquid metal and two-dimensional materials, including how to prepare specific two-dimensional materials based on liquid metal, and the stripping method is also included. Three kinds of applications are discussed in detail, including the detection of human glucose concentration, pulse detection, and sweat analysis, whose sensing principles depend on piezoelectric, optical, and electrochemical. At the end of the article, we summarized the current challenges faced by biosensors based on liquid metal and looked forward to its future development and future directions of advances.

关键词： Liquid metal Two-dimensional materials Non-invasive Flexible sensor Sensing principles

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synthesis, Stable Radical Anion and Energy Storage Performance of Pentacene Tetraimides

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Angewandte Chemie 2024年第5期137卷

作者： Dr. Xiaoxiao You Hang Liu Hao Zhou Xingyu Chen Jingwen Xu Dr. Dongxue Wang Dr. Di Wu Prof. Jianlong Xia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices Wuhan University of Technology Wuhan 430070 China International School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan 430070 China

Imide functionalization has been widely proved to be an effective approach to enrich optoelectronic properties of polycyclic aromatic hydrocarbons (PAHs). However, appending multiple imide groups onto linear acenes is still a synthetic challenge. Herein, we demonstrate that by taking advantage of a “breaking and mending” strategy, a linear pentacene tetraimides (PeTI) was synthesized through a three-step sequence started from the naphthalene diimides (NDI). Compared with the parent pentacene, PeTI shows a deeper-lying lowest unoccupied molecular orbital (LUMO) energy level, narrower band gap and better stability. The redox behavior of PeTI was firstly evaluated by generating a stable radical anion specie with the assistance of cobaltocene (CoCp 2 ), and the structure of the electron transfer (ET) complex was confirmed by the X-ray crystallography. Moreover, due to the presence of multiple redox-active sites, we are able to show that the state-of-the-art energy storage performance of the dealkylated PeTI (designated as PeTCTI) in organic potassium ion batteries (OPIBs) as an anode. Our results shed light on the application of multiple imides functionalized linear acenes, and the reported synthetic strategy provides an effective way to get access to longer nanoribbon imides with fascinating electronic properties.

关键词： acene imides α-arylation radical anions potassium ion batteries

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Binary Cations Minimize Energy Loss in the Wide Bandgap Perovskite Towards Efficient All-Perovskite Tandem Solar Cells

SSRN

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SSRN 2023年

作者： Zhang, Kaicheng Liu, Chao Peng, Zijian Li, Chaohui Li, Canru Cerrillo, José Garcia Englhard, Jonas Li, Ning Zhang, Jiyun Tian, Jingjing Du, Tian Sathasivam, Sanjayan Macdonald, Thomas J. These, Albert Le Corre, Vincent M. Forberich, Karen Meng, Wei Osvet, Andres Lüer, Larry Bachmann, Julien Tong, Jinhui Brabec, Christoph J. Department of Materials Science and Engineering Friedrich-Alexander-Universität Erlangen-Nürnberg Martensstrasse 7 Erlangen91058 Germany Immerwahrstrasse 2 Erlangen91058 Germany Chemistry of Thin Film Materials Department of Chemistry and Pharmacy Friedrich-Alexander-Universität Erlangen-Nürnberg IZNF Cauerstrasse 3 Erlangen91058 Germany State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and Devices School of Materials Science and Engineering South China University of Technology 381 Wushan Road Guangzhou510640 China Materials Chemistry Centre Department of Chemistry University College London 20 Gordon Street LondonWC1H 0AJ United Kingdom School of Engineering and Materials Science Queen Mary University of London LondonE1 4NS United Kingdom State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Perovskite-based tandem solar cells, known for their exceptional performance and cost-effective fabrication, are at the forefront of photovoltaic technologies. This study addresses key challenges in enhancing the efficiency and stability of these tandem devices, focusing on the front wide-bandgap perovskite sub-cell. The surface treatment of a 1.80 eV perovskite with binary cations, specifically guanidinium bromide and 4-fluorophenylammonium iodide, proves instrumental in reducing defect densities and mitigating interfacial energy barriers. This treatment significantly suppresses non-radiative recombination and transport losses, resulting in a remarkable open circuit voltage and fill factor (VOC × FF) product of 1.061 V and a notable power conversion efficiency (PCE) of 19.0%. Reproducibility is underscored by consistent results across different laboratories. Furthermore, integration with a tin-based narrow-bandgap perovskite yields an all-perovskite tandem device boasting a cutting-edge PCE of 27.2%. This comprehensive exploration of spacer cations’ pivotal role in perovskite surface treatment advances the technology for commercialization. © 2023, The Authors. All rights reserved.

关键词： Perovskite

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Hollow Iron–Vanadium Composite Spheres: A Highly Efficient Iron‐Based Water Oxidation Electrocatalyst without the Need for Nickel or Cobalt

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Angewandte Chemie 2017年第12期129卷

作者： Ke Fan Yongfei Ji Haiyuan Zou Jinfeng Zhang Bicheng Zhu Hong Chen Quentin Daniel Yi Luo Jiaguo Yu Licheng Sun Department of Chemistry KTH Royal Institute of Technology 10044 Stockholm Sweden State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 430070 Wuhan China School of Biotechnology KTH Royal Institute of Technology 10691 Stockholm Sweden State Key Lab of Fine Chemicals DUT-KTH Joint Education and Research Center on Molecular Devices Dalian University of Technology 116024 Dalian China

Noble‐metal‐free bimetal‐based electrocatalysts have shown high efficiency for water oxidation. Ni and/or Co in these electrocatalysts are essential to provide a conductive, high‐surface area and a chemically stable host. However, the necessity of Ni or Co limits the scope of low‐cost electrocatalysts. Herein, we report a hierarchical hollow FeV composite, which is Ni‐ and Co‐free and highly efficient for electrocatalytic water oxidation with low overpotential 390 mV (10 mA cm −2 catalytic current density), low Tafel slope of 36.7 mV dec −1 , and a considerable durability. This work provides a novel and efficient catalyst, and greatly expands the scope of low‐cost Fe‐based electrocatalysts for water splitting without need of Ni or Co.

关键词： Eisenkomposite Elektrokatalysatoren Überpotential Vanadium Wasseroxidation

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Semiconductors: Light‐Steered Isotropic Semiconductor Micromotors (Adv. Mater. 3/2017)

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advanced materials 2017年第3期29卷

作者： Chuanrui Chen Fangzhi Mou Leilei Xu Shaofei Wang Jianguo Guan Zunpeng Feng Quanwei Wang Lei Kong Wei Li Joseph Wang Qingjie Zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and Engineering Wuhan University of Technology 122 Luoshi road Wuhan 430070 P. R. China Department of Nanoengineering University of California San Diego La Jolla CA 92093 USA

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Dimensional control of octahedral tilt in SrRuO3 via infinite-layered oxides

arXiv

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arXiv 2021年

作者： Lin, Shan Zhang, Qinghua Sang, Xiahan Zhao, Jiali Cheng, Sheng Huon, Amanda Jin, Qiao Chen, Shuang Chen, Shengru Guo, Haizhong He, Meng Ge, Chen Wang, Can Wang, Jia-Ou Fitzsimmons, Michael R. Gu, Lin Zhu, Tao Jin, Kui-Juan Guo, Er-Jia Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Nanostructure Research Center Wuhan University of Technology 122 Luoshi Rd. Wuhan430070 China Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Spallation Neutron Source Science Center Dongguan523803 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100190 China Neutron Scattering Division Oak Ridge National Laboratory Oak RidgeTN37831 United States School of Physical Engineering Zhengzhou University Zhengzhou450001 China Songshan Lake Materials Laboratory DongguanGuangdong523808 China

Manipulation of octahedral distortion at atomic length scale is an effective means to tune the physical ground states of functional oxides. Previous work demonstrates that epitaxial strain and film thickness are variable parameters to modify the octahedral rotation and tilt. However, selective control of bonding geometry by structural propagation from adjacent layers is rarely studied. Here we propose a new route to tune the ferromagnetic response in SrRuO3 (SRO) ultrathin layers by oxygen coordination of adjacent SrCuO2 (SCO) layers. The infinite-layered CuO2 in SCO exhibits a structural transformation from "planar-type" to "chain-type" as reducing film thickness. These two orientations dramatically modify the polyhedral connectivity at the interface, thus altering the octahedral distortion of SRO. The local structural variation changes the spin state of Ru and hybridization strength between Ru 4d and O 2p orbitals, leading to a significant change in the magnetoresistance and anomalous Hall resistivity of SRO layers. These findings could launch further investigations into adaptive control of magnetoelectric properties in quantum oxide heterostructures using oxygen coordination. © 2021, CC BY.

关键词： Ruthenium compounds

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[email protected] @SiO 2 microcapsules with controlled porosity for whole-cell based enantioselective biosynthesis of ( S )−1-phenylethanol

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Colloids and Surfaces B: Biointerfaces 2022年 214卷

作者： Li Wang Bo-Bo Zhang Xiao-Yu Yang Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Luoshi Road 122 Wuhan 430070 China Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 Rue de Bruxelles Namur 5000 Belgium Guangdong Provincial Key Laboratory of Marine Biotechnology Institute of Marine Sciences Department of Biology College of Science Shantou University Shantou 515063 China

Whole-cell biocatalysis, owing to its high enantioselectivity, environment friendly and mild reaction condition, show a great prospect in chemical, pharmaceutical and fuel industry. However, several problems still limit its wide applications, mainly concerning the low productivity and poor stability. Although the biocatalyst encapsulated in the most-commonly-used alginate hydrogels demonstrate enhanced stability, it still suffers from low biocatalytic productivity, long-term reusability and poor mass diffusion control. In this work, hybrid [email protected] @SiO 2 microcapsules with controlled porosity are designed to encapsulate yeast cells for the asymmetric biosynthesis of ( S )− 1-phenylethonal from acetophenone. The hybrid microcapsules are formed by the ionic cross-linking of alginate, the polymerization of dopamine monomers and the protamine-assisted colloidal packing of uniform-sized silica nanoparticles. Alginate provides the encapsulated cells with highly biocompatible environment. Polydopamine enables to stimulate the biocatalytic productivity of the encapsulated yeast cells. Silica shells can not only regulate the mass diffusion in biocatalysis but also enhance the long-term mechanical and chemical stability of the microcapsules. The morphology, structure, chemical composition, stability and molecular accessibility of the hybrid microcapsules are investigated in detail. The viability and asymmetric bioreduction performance of the cells encapsulated in microcapsules are evaluated. The 24 h product yield of the cells encapsulated in the hybrid microcapsules shows 1.75 times higher than that of the cells encapsulated in pure alginate microcapsules. After 6 batches, the 24 h product yield of the cells encapsulated in the hybrid microcapsules is well maintained and 2 times higher than that of the cells encapsulated in pure alginate microcapsules. Therefore, the hybrid microcapsules designed in this study enable to enhance the asymmetric biocatalytic activity,

关键词： Hybrid hydrogel Surface coating Colloidal packing Ordered porosity Cell encapsulation Asymmetric bioreduction

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