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Frontispiece: Anion Modulation of Pt-Group Metals and Electrocatalysis Applications

Chemistry – A European Journal 2021年第48期27卷

作者： Ding Chen Jiawei Zhu Dr. Zonghua Pu Prof. Shichun Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China Foshan Xianhu Laboratory of Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan 528200 P. R. China

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Boron-Induced Interstitial Effects Drive Water Oxidation on Ordered Ir−B Compounds

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Angewandte Chemie 2024年第35期136卷

作者： Ding Chen Ruohan Yu Hongyu Zhao Jixiang Jiao Xueqin Mu Jun Yu Prof. Shichun Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China The Sanya Science and Education Innovation Park of Wuhan University of Technology Sanya 572000 P. R. China

Interstitial filling of light atoms strongly affects the electronic structure and adsorption properties of the parent catalyst due to ligand and ensemble effects. Different from the conventional doping and surface modification, constructing ordered intermetallic structures is more promising to overcome the dissolution and reconstruction of active sites through strong interactions generated by atomic periodic arrangement, achieving joint improvement in catalytic activity and stability. However, for tightly arranged metal lattices, such as iridium (Ir), obtaining ordered filling atoms and further unveiling their interstitial effects are still limited by highly activated processes. Herein, we report a high-temperature molten salt assisted strategy to form the intermetallic Ir−B compounds (IrB 1.1 ) with ordered filling by light boron (B) atoms. The B residing in the interstitial lattice of Ir constitutes favorable adsorption surfaces through a donor-acceptor architecture, which has an optimal free energy uphill in rate-determining step (RDS) of oxygen evolution reaction (OER), resulting in enhanced activity. Meanwhile, the strong coupling of Ir−B structural units suppresses the demetallation and reconstruction behavior of Ir, ensuring catalytic stability. Such B-induced interstitial effects endow IrB 1.1 with higher OER performance than commercial IrO 2 , which is further validated in proton exchange membrane water electrolyzers (PEMWEs).

关键词： interstitial effects intermetallic compounds oxygen evolution donor-acceptor architecture host–guest electron coupling

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Electric-field-assisted Proton Coupling Enhanced Oxygen Evolution Reaction

Research Square

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Research Square 2024年

作者： Pan, Xuelei Yan, Mengyu Liu, Qian Zhou, Xunbiao Liao, Xiaobin Sun, Congli Zhu, Jiexin McAleese, Callum Couture, Pierre Sharpe, Matthew K. Smith, Richard Peng, Nianhua England, Jonathan Tsang, Shik Chi Edman Zhao, Yunlong Mai, Liqiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Wolfson Catalysis Centre Department of Chemistry University of Oxford OX1 3QR United Kingdom School of Materials Science and Engineering Zhejiang University Hangzhou310027 China UK National Ion Beam Centre University of Surrey Guildford SurreyGU2 7XH United Kingdom Dyson School of Design Engineering Imperial College London LondonSW7 2BX United Kingdom National Physical Laboratory Teddington MiddlesexTW11 0LW United Kingdom

The discovery of Mn-Ca complex in photosystem II stimulates research of manganese-based catalysts for oxygen evolution reaction (OER). However, conventional chemical strategies face challenges in regulating the four electron-proton processes of OER. Herein, we investigate alpha-manganese dioxide (α-MnO2) with typical MnIV-O-MnIII-HxO motifs as a model for adjusting proton coupling. We reveal that pre-equilibrium proton-coupled redox transition provides an adjustable energy profile for OER, paving the way for in-situ enhancing proton coupling through a new "reagent"— external electric field. Based on the α-MnO2 single-nanowire device, gate voltage induces a 6-fold increase in OER current density at 1.7 V versus reversible hydrogen electrode. Moreover, the proof-of-principle external electric field-assisted flow cell for water splitting demonstrates a 34% increase in current density and a 44.7 mW/cm2 increase in net output power. These findings indicate an in-depth understanding of the role of proton-incorporated redox transition and develop practical approach for high-efficiency electrocatalysis. © 2024, CC BY.

关键词： Oxygen

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Microdevices: Carbon-MEMS-Based Alternating Stacked MoS2@rGO-CNT Micro-Supercapacitor with High Capacitance and Energy Density (Small 26/2017)

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Small 2017年第26期13卷

作者： Wei Yang Liang He Xiaocong Tian Mengyu Yan Hui Yuan Xiaobin Liao Jiashen Meng Zhimeng Hao Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China Department of Materials Science and NanoEngineering Rice University Houston TX 77005 USA Department of Chemistry University of California Berkeley CA 94720 USA

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Upper bound of a band complex

arXiv

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arXiv 2023年

作者： Li, Si Zhang, Zeying Feng, Xukun Wu, Weikang Yu, Zhi-Ming Zhao, Y.X. Yao, Yugui Yang, Shengyuan A. School of Physics Northwest University Xi’an710127 China Shaanxi Key Laboratory for Theoretical Physics Frontiers Xi’an710127 China College of Mathematics and Physics Beijing University of Chemical Technology Beijing100029 China Research Laboratory for Quantum Materials Singapore University of Technology and Design Singapore487372 Singapore Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan250061 China Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing100081 China National Laboratory of Solid State Microstructures Department of Physics Nanjing University Nanjing210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China

Band structure for a crystal generally consists of connected components in energy-momentum space, known as band complexes. Here, we explore a fundamental aspect regarding the maximal number of bands that can be accommodated in a single band complex. We show that in principle a band complex can have no finite upper bound for certain space groups. It means infinitely many bands can entangle together, forming a connected pattern stable against symmetry-preserving perturbations. This is demonstrated by our developed inductive construction procedure, through which a given band complex can always be grown into a larger one by gluing a basic building block to it. As a by-product, we demonstrate the existence of arbitrarily large accordion type band structures containing NC = 4n bands, with n ∈ N. Copyright © 2023, The Authors. All rights reserved.

关键词： Band structure

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Fabrication of translucent boron nitride dispersed polycrystalline silicon nitride ceramics

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IOP Conference Series: materials Science and Engineering 2011年第1期20卷

作者： B Joshi Z Fu K Niihara S W Lee Department of Metallurgy and Material Engineering Sunmoon University Korea State Key Lab of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology China Nagaoka University of Technology Nagaoka Japan Department of Environment Engineering Sunmoon University Asan Korea

Optical transparency was achieved at infrared region and overall translucent silicon nitride was fabricated using hot press sintering (HPS). The increase in h-BN content decreased the optical transparency. Microstructral observations shows that the optical, mechanical and tribological properties of BN dispersed polycrystalline Si3N4 ceramics were affected by the density, α:β-phase ratio and content of h-BN in sintered ceramics. The hot pressed samples were prepared from the mixture of α-Si3N4, AlN, MgO and h-BN at 1850°C. The composite contained from 0.25 to 2 mass % BN powder with sintering aids (9% AlN + 3% MgO). Maximum transmittance of 57% was achieved for 0.25 mass % BN doped Si3N4 ceramics. Fracture toughness was increased and wear volume and friction coefficient were decreased with increase in BN content.

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Optical, mechanical and tribological properties of Y2O3, Er2O3 and Nd2O3 doped polycrystalline silicon nitride ceramics

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IOP Conference Series: materials Science and Engineering 2011年第8期18卷

作者： Bhupendra Joshi Zhengyi Fu Koichi Niihara Soo W Lee Department of Metallurgy and Material Engineering Sunmoon University Korea State Key Lab of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology China Nagaoka University of Technology Nagaoka Japan Department of Environment Engineering Sunmoon University Asan Korea

Y2O3, Er2O3 and Nd2O3 doped polycrystalline silicon nitride ceramics were prepared by hot press sintering method at 1850°C and 30 MPa pressure. 1 wt.% of each rare earth oxides (REO) were sintered with 3 wt.% MgO, 9 wt.% AlN and 87 wt.% α-*** optical, mechanical and tribological properties of REO doped polycrystalline silicon nitride ceramics were investigated. Optical transmittance was measured in visible and near infrared region and found to be 54% transmittance for Y2O3 doped Si3N4 ceramics. β- phase transformation was suppressed with REO addition. High hardness and high fracture toughness were achieved by addition of REO. Adding REO shows good mechanical properties as high strength and toughness. Coefficient of friction of the REO doped silicon nitride ceramics was lower than that of without REO doped silicon nitride ceramics.

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Effects of crystallinity and surface modification of calcium phosphate nanoparticles on the loading and release of tetracycline hydro-chloride

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IOP Conference Series: materials Science and Engineering 2017年第1期182卷

作者： Huaizhi Zhang Dong Yan Sriyani Menike Korale Gedara Sajith Sudeepa Fernando Dingiri Marakkalage Jothirathna Gamage Kasun Methlal YingChao Han HongLian Dai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Biomedical Materials and Engineering Research Center of Hubei Province Wuhan University of Technology Wuhan 430070 China Faculty of Applied Sciences Sabaragamuwa University of Sri Lanka Belihuloya 70140 Sri Lanka

The influences of crystallinity and surface modification of calcium phosphate nanoparticles (nCaP) on their drug loading capacity and drug release profile were studied in the present investigation. The CaP nanoparticles with different crystallinity were prepared by precipitation method under different temperatures. CaP nanoparticles with lower crystallinity exhibited higher drug loading capacity. The samples were characterized by XRD, FT-IR, SEM, TEM and BET surface area analyzer respectively. The drug loading capacity of nCaP was evaluated to tetracycline hydro-chloride (TCH). The internalization of TCH loaded nCaP in cancer cell was observed by florescence microscope. nCaP could be stabilized and dispersed in aqueous solution by poly(acrylic acid) surface modification agent, leading to enhanced drug loading capacity. The drug release was conducted in different pH environment and the experimental data proved that nCaP were pH sensitive drug carrier, suggesting that nCaP could achieve the controlled drug release in intracellular acidic environment. Furthermore, nCaP with higher crystallinity showed lower drug release rate than that of lower crystallinity, indicating that the drug release profile could be adjusted by crystallinity of nCaP. nCaP with adjustable drug loading and release properties are promising candidate as drug carrier for disease treatment.

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Smart Polymers with Special Wettability

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Small (Weinheim an der Bergstrasse, Germany) 2017年第4期13卷 2017 Jan;13(4)页

作者： Baisong Chang Bei Zhang Taolei Sun State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P.R. China. School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan 430070 P.R. China.

Surface wettability plays a key role in addressing issues ranging from basic life activities to our daily life, and thus being able to control it is an attractive goal. Learning from nature, both of its structure and function, brings us much inspiration in designing smart polymers to tackle this major challenge. Life functions particularly depend on biomolecular recognition-induced interfacial properties from the aqueous phase onto either "soft" cell and tissue or "hard" inorganic bone and tooth surfaces. The driving force is noncovalent weak interactions rather than strong covalent combinations. An overview is provided of the weak interactions that perform vital actions in mediating biological processes, which serve as a basis for elaborating multi-component polymers with special wettabilities. The role of smart polymers from molecular recognitions to macroscopic properties are highlighted. The rationale is that highly selective weak interactions are capable of creating a dynamic synergetic communication in the building components of polymers. Biomolecules could selectively induce conformational transitions of polymer chains, and then drive a switching of physicochemical properties, e.g., roughness, stiffness and compositions, which are an integrated embodiment of macroscopic surface wettabilities.

关键词： chirality dynamic biointerfaces molecular recognition smart polymers superwettability

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Structure and electrochemical properties for the MoxV3−xO7/MWNTs nanocomposites

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IOP Conference Series: materials Science and Engineering 2011年第8期18卷

作者： Quanyao Zhu Siping Hu Wei Jin Hao Wen Wen Chen Galina Zakharova State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan 430070 People's Republic of China Institute of Solid State Chemistry of the Ural Branch Russian Academy of Science Pervomaiskaya 91 Yekaterinburg 620990 Russia

The MoxV3−xO7/MWNTs nanocomposites were fabricated via a hydrothermal reaction followed by self-assembling process. The nanocomposites were characterized in terms of surface morphology and structure by FESEM, TEM, XRD and XPS analysis, respectively. The electrochemical behaviors of the nanocomposites were investigated by galvanostatic charge-discharge test and cyclic voltammetry. The results showed that MoxV3−xO7/MWNTs nanocomposites had great cycleability as well as capacity characteristics, which was 277.4 mAh/g in the first discharge process and remained 207.9 mAh/g after fiftieth discharge cycle. In the rapid charge-discharge test, the capacity rate still remained 88.6 % after twentieth cycles at 1.2 C discharge.

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