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Holey platinum nanotubes for ethanol electrochemical reforming in aqueous solution

Science Bulletin 2021年第20期66卷 2079-2089,M0003页

作者： Tian-Jiao Wang Hui-Ying Sun Qi Xue Ming-Jun Zhong Fu-Min Li Xinlong Tian Pei Chen Shi-Bin Yin Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province Key Laboratory of Applied Surface and Colloid Chemistry(Ministry of Education)Shaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710062China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228China MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China

The catalytic/electrocatalytic performance of platinum(Pt)nanostructures highly relates to their ***,we propose a facile self-template pyrolysis strategy at high temperature to synthesize one-dimensionally holey Pt nanotubes(Pt-hNTs)using Pt^(Ⅱ)-dimethylglyoxime complex(Pt^(Ⅱ)-DMG)nanorods as the reaction *** coordination capability of DMG results in the generation of Pt^(Ⅱ)-DMG nanorods,whereas the reducibility of DMG at high temperature leads to the reduction of Pt^(Ⅱ)species in Pt^(Ⅱ)-DMG *** the reaction process,the inside-out Ostwald ripening phenomenon leads to the hollow morphology of *** from the physical characteristics of hollow and holey structure,Pt-hNTs with clean surface show superior electroactivity and durability for catalyzing ethanol electrooxidation as well as hydrogen evolution reaction in alkaline *** optimized experimental conditions,the constructed symmetric Pt-hNTs||Pt-hNTs ethanol electrolyzer only requires an electrolysis voltage of 0.40 V to achieve the electrochemical hydrogen production,demonstrating a highly energy saving strategy relative to traditional water electrolysis.

关键词： Holey platinum nanotubes High temperature pyrolysis Ethanol electrochemical reforming Ethanol oxidation reaction Hydrogen production

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High and Low Temperature Resistance of Phenyl silicone rubber 7

High and Low Temperature Resistance of Phenyl silicone rubbe...

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2020 7th International Conference on advanced materials, Mechanics and Structural Engineering, AMMSE 2020

作者： Huang, Yanhua Mu, Qiuhong Su, Zhengtao Beijing Institute of Aeronautical Materials Aviat. Key Lab. of Sci. and Technol. on Mat. and Applic. Research for Vibration and Noise Reduction Beijing100095 China Qilu University of Technology Shandong Academy of Sciences Advanced Materials Institute Jinan250014 China Shandong Provincial Key Laboratory for Special Silicone-Containing Materials Jinan250014 China

Methyl Phenyl and diphenyl silicone rubbers were synthesized from octamethyl cyclotetrasiloxane (D4), methylphenyl cyclosiloxane, octaphenyl cyclotetrasiloxane, etc. Compared with the commercial methylvinyl silicone rubber, the high and low temperature resistances of methyl vinyl silicone rubber were studied in this paper. The results showed that the introduction of phenyl groups can improve the thermal properties of silicone rubber, and the thermal stability of diphenyl silicone rubber is better than that of methyl phenyl silicone rubber. But there is little difference of mechanical properties in high temperature environment for three silicone rubber. DMTA analysis showed that there were still a small amount of crystals in diphenyl silicone rubber, while methylphenyl silicone rubber was amorphous rubber. The mechanical properties at low temperature indicated that the tensile strength of diphenyl silicone rubber was 4.1Mpa higher than that of methylphenyl silicone rubber at -70 °C due to the existence of low-temperature crystallization. © Published under licence by IOP Publishing Ltd.

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Effect of Gradient Multilayer on Tribological Performance of Tin/Tisin Coatings Prepared by Cathodic Arc Ion Plating

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SSRN 2023年

作者： Tu, Rong Jiao, Jiao Jiang, Mingquan Yang, Mai Ji, Baifeng Gao, Tenghua Li, Qizhong Zhang, Song Zhang, Lianmeng Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou521000 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Wuhan University of Technology Advanced Engineering Technology Research Institute of Zhongshan City Xiangxing Road 6 Zhongshan528400 China School of Civil Engineering and Architecture Wuhan University of Technology Wuhan430070 China Department of Applied Physics and Physico-Informatics Keio University Yokohama223-8522 Japan Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China

Hard coatings such as transition metal nitrides have been widely applied to improve the mechanical properties and tribological performance of cutting tools. The coatings in various multilayer structures or gradient structures have been designed to meet the demands of more severe service environments and more precise processing requirements. In this work, TiN/TiSiN coatings in several gradient&multilayered structures were deposited on cemented carbide by cathodic arc ion plating using TiSi alloy and Ti targets. The modulation period (Λ) of the multilayer varies gradually with thickness, ranging from 6 to 46 nm. The gradient multilayer coatings consist of nanocrystalline-amorphous composite with compact growth. The coating with modulation period first increasing and then decreasing has the highest hardness of 38 GPa and the maximum residual compressive stress of -2.71 GPa as well as the minimum coefficient of friction (COF) and wear rate. Gradient and multilayer structures moderate the brittleness caused by the presence of amorphous SiNx phase, and optimizes the mechanical properties and tribological performances of the coatings. © 2023, The Authors. All rights reserved.

关键词： Nanocrystals

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Synergistic Strategy of Rubidium Chloride Regulated Sno2and 4-Tert-Butyl-Benzylammonium Iodide Passivated Maxfa1-Xpbi3 for Efficient Mixed-Cation Perovskite Solar Cells

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SSRN 2023年

作者： Sun, Jia Gu, Yinsheng Lu, Yingwei Hu, Juntao Chen, Tao Zhu, Changfei Luo, Paifeng School of Materials Science and Engineering Hefei University of Technology Anhui Hefei230009 China Engineering Research Center of High Performance Copper Alloy Materials and Processing Ministry of Education Hefei University of Technology Hefei230009 China National Engineering Lab of Special Display Technology State Key Lab of Advanced Display Technology Academy of Opto-Electronic Technology Hefei University of Technology Hefei230009 China Hefei National Laboratory for Physical Sciences at Microscale CAS Key Laboratory of Materials for Energy Conversion Department of Materials Science and Engineering University of Science and Technology of China Anhui Province Hefei230026 China Institute of Energy Hefei Comprehensive National Science Center Hefei China

Nowadays, the MA-FA mixed-cation perovskite solar cells (PSCs), demonstrating much higher stability than that of single-cation MAPbI3 or FAPbI3, are still encountering a low-efficiency issue. The main reason is that there existing a lot of defects in SnO2 electron transport layers (ETLs) and perovskite absorbers. Herein, we develop a synergistic strategy of Rubidium Chloride (RbCl) doping and 4-tert-butylbenzylammonium iodide (tBBAI) passivation to fabricate high-performance MAxFA1-xPbI3 mixed-cation PSCs. The alkali halide RbCl is first selected as a novel doping additive to regulate the film properties of SnO2 and perovskites. Research shows that the negative Cl- ions can combine with uncoordinated Sn4+ ions due to their strong bonding ability, which can passivate the oxygen-vacancy-related defects and enhance the charge transport of SnO2 ETLs. Meanwhile, the doped Rb+ and Cl- ions may diffuse into perovskite lattices to promote grain growth and reduce the defects of perovskites. Besides, we employ an organic halide salt tBBAI to passivate perovskites and suppress surface defects. Results of deep level transient spectroscopy (DLTS) indicate that SnO2 and SnO2-RbCl based devices have deeper hole traps and large trap densities (ΔE=0.92 eV, NT=1.10×1016 cm-3;ΔE=0.93 eV, NT=2.16×1015 cm-3);while tBBAI-treated SnO2-RbCl-based devices own a shallower hole trap and a smaller trap density (ΔE=0.72 eV, NT=2.44×1013 cm-3);and the corresponding IPb and I(MA/FA) antisite defeats are also identified. Therefore, our synergistic strategy is effectively able to reduce the defect density and suppress the non-radiative recombination. Consequently, the best-performance MA0.85FA0.15PbI3 PSCs achieve an impressive power conversion efficiency (PCE) of 22.54% with a large open circuit voltage (Voc) of 1.16 V, which are by far the highest values of MA0.85FA0.15PbI3 mixed-cation PSCs. © 2023, The Authors. All rights reserved.

关键词： Perovskite solar cells

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In situ synthesis of oriented Zn-Mn-Co-telluride on precursor free CuO: An experimental and theoretical study of hybrid electrode paradigm for advanced supercapacitors

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Nano materials Science 2024年

作者： Ahmad, Muhammad Nawaz, Tehseen Hussain, Iftikhar Chen, Xi Khan, Shahid Ali Eddahani, Yassine Abraham, B. Moses Ali, Shafqat Wang, Ci Zhang, Kaili Department of Mechanical Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong A.J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering Drexel University 3141 Chestnut Street PhiladelphiaPA19104 United States Department of Chemistry The University of Hong Kong Hong Kong Department of Chemical Engineering Indian Institute of Technology Kanpur Kanpur208016 India State Key Laboratory of New Textile Materials and Advanced Processing Technologies National Local Joint Laboratory for Advanced Textile Processing and Clean Production Wuhan Textile University Wuhan430200 China Key Lab of In-fiber Integrated Optics Ministry Education of China Harbin Engineering University Harbin150001 China

The evolution of energy storage technology has seen remarkable progress, with a shift from pure metals to sophisticated, tailor-made active materials. The synthesis of nanostructures with exceptional properties is crucial in the advancement of electrode materials. In this regard, our study highlights the fabrication of a novel, oriented heterostructure comprised of Zn-Mn-Co-telluride grown on a pre-oxidized copper mesh using a hydrothermal method followed by a solvothermal process. This innovative approach leads to the formation of the Zn-Mn-Co-telluride@CuO@Cu heterostructure, which demonstrates the unique oriented morphology. It outperforms both Zn-Mn-Co-telluride@Cu and CuO@Cu by exhibiting lower electrical resistivity, increased redox activity, higher specific capacity, and improved ion diffusion characteristics. The conductivity enhancements of the heterostructure are corroborated by density functional theory (DFT) calculations. When utilized in a hybrid supercapacitor (HSC) alongside activated carbon (AC) electrodes, the Zn-Mn-Co-telluride@CuO@Cu heterostructure-based HSC achieves an energy density of 75.7 Wh kg−1. Such findings underscore the potential of these novel electrode materials to significantly impact the design of next-generation supercapacitor devices. © 2024 Chongqing University

关键词： Electrodes

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Facile Fabrication of Ag Nanocrystals Encapsulated in Nitrogen-doped Fibrous Carbon as an Efficient Catalyst for Lithium Oxygen Batteries

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Energy & Environmental materials 2021年第2期4卷 239-245页

作者： Lili Liu Tianyi Ma Weiwei Fang Yuqing Liu Kostantin Konstantinov Jiazhao Wang Hua-Kun Liu School of Energy and Institute for Advanced Materials Nanjing Tech UniversityJiangsu ProvinceNanjing 211816China Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Jiangsu Provincial Key Lab for the Chemistry and Utilization of Agro-Forest BiomassCollege of Chemical EngineeringNanjing Forestry University(NFU)Nanjing 210037China State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China Intelligent Polymer Research Institute University of WollongongWollongong NSW 2522Australia Institute for Superconducting and Electronic Materials University of WollongongWollongong NSW 2522Australia

A facile synthesis of Ag nanocrystals encapsulated in nitrogen-doped carbon fiber(NCF)is proposed,based on the simultaneous reaction between pyrrole and Ag^(+)ions in an aqueous solvent followed by a heat *** as-prepared Ag/NCF demonstrated superior catalytic behavior toward ORR and *** improved cycling stability,a much lower discharge/charge gap of 0.89 V(vs Li/Li^(+))compared with 1.38 V for NCF cathode with a fixed capacity of 500 m Ah g^(-1)was obtained in lithium oxygen *** introduction of Ag crystals into NCF facilitates the oxygen reduction reaction/oxygen evolution reaction kinetics.X-ray diffraction analysis coupled with Raman spectroscopy confirmed that Ag/NCF cathode could reversibly catalyze Li_(2)O_(2)formation and *** NCF matrix offers a conductive network to realize rapid mass transfer and the encapsulated Ag nanocrystals supplied effective catalytic active *** combined action between both contributes to the superior electrocatalytic performance.

关键词： Ag nanocrystals Li_(2)O_(2) Li–O_(2)batteries N-carbon fiber overpotential

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CoS2/V2O3 Heterostructure with Coffee Ground Derived Carbon as Superior Composite Anodes of Sodium-Ion Batteries

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SSRN 2023年

作者： Xue, Yongqi Wu, Jun Cheng, Zhiqun Xu, Congxin Cai, Yurong Ni, Wenbin Zhou, Xiaochong College of Electronics and Information Hangzhou Dianzi University Hangzhou310018 China The Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education National Engineering Lab for Textile Fiber Materials and Processing Technology School of Materials Science and Engineering Zhejiang Sci-Tech University Hangzhou310018 China Huzhou Horizontal Na Energy Technology Co. Ltd Chengye Intelligent Center No. 819 Xisaishan Road Longxi Street Huzhou313000 China

The poor ion transport kinetics and serious volumetric change of transition metal sulfides hinder their electrochemical applications. In this study, we introduced a heterostructure between CoS2 and V2O3 as an anode of sodium-ion batteries (SIBs) via a feasible hydrothermal method combining with a biomass carbon derived from coffee grounds (CG). The as-prepared CoS2/V2O3-CG composite retained a reversible capacity of 464.5 mAh g-1 after 300 cycles at 0.5 A g-1, exhibited an excellent rate capability of up to 8 A g-1 and a remarkable long-cycling life of over 2,000 cycles at 2 A g-1 with a capacity decay rate of less than 0.041% per cycle. The kinetic analysis indicated that CoS2/V2O3-CG composite exhibited a superior capacitive behavior, making it a high Na+ diffusion coefficient in SIBs. The enhanced electrochemical performances of composite can be primarily attributed to the CoS2/V2O3 heterostructure and porous biomass-derived carbon, which offers a built-in electric field and a large surface area, and effectively alleviates the volumetric expansion effect. © 2023, The Authors. All rights reserved.

关键词： Anodes

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2D CoOOH Sheet-Encapsulated Ni2P into Tubular Arrays Realizing 1000 mA cm^-2-Level-Current-Density Hydrogen Evolution Over 100 h in Neutral Water

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Nano-Micro Letters 2020年第10期12卷 247-262页

作者： Shucong Zhang Wenbin Wang Feilong Hu Yan Mi Shuzhe Wang Youwen Liu Xiaomeng Ai Jiakun Fang Huiqiao Li Tianyou Zhai Guangxi Key Laboratory of Chemistry and Engineering of Forest Products Guangxi University for NationalitiesNanning 530008GuangxiPeople’s Republic of China State Key Laboratory of Material Processing and Die and Mould Technology and School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiPeople’s Republic of China State Key Lab of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074HubeiPeople’s Republic of China

Water electrolysis at high current density(1000 mA cm-2 level)with excellent durability especially in neutral electrolyte is the pivotal issue for green hydrogen from experiment to *** addition to the high intrinsic activity determined by the electronic structure,electrocatalysts are also required to be capable of fast mass transfer(electrolyte recharge and bubble overflow)and high mechanical ***,the 2D CoOOH sheet-encapsulated Ni2P into tubular arrays electrocatalytic system was proposed and realized 1000 mA cm-2-levelcurrent-density hydrogen evolution over 100 h in neutral *** designed catalysts,2D stack structure as an adaptive material can buffer the shock of electrolyte convection,hydrogen bubble rupture,and evolution through the release of stress,which insure the long cycle ***,the rich porosity between stacked units contributed the good infiltration of electrolyte and slippage of hydrogen bubbles,guaranteeing electrolyte fast recharge and bubble evolution at the high-current *** that,the electron structure modulation induced by interfacial charge transfer is also beneficial to enhance the intrinsic ***,the multiscale coordinated regulation will provide a guide to design high-efficiency industrial electrocatalysts.

关键词： Large-scale hydrogen production Mass transport 2D adaptive material Interfacial charge modulation Multiscale coordinated regulation

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Chiral NIR-Ⅱ fluorescent Ag_(2)S quantum dots with stereospecific biological interactions and tumor accumulation behaviors

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Science Bulletin 2022年第12期67卷 1274-1283,M0004页

作者： Shaohua Qu Qian Jia Zheng Li Zhongliang Wang Li Shang State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical University(NPU)Xi’an 710072China Lab of Molecular Imaging and Translational Medicine(MITM) Engineering Research Center of Molecular&NeuroimagingMinistry of EducationSchool of Life Science and TechnologyXidian UniversityXi’an 710126China Academy of Advanced Interdisciplinary Research Xidian UniversityXi’an 710071China

Near-infrared Ⅱ(NIR-Ⅱ)fluorescent nanoprobes hold great potential for biomedical *** the relationship between surface properties of NIR-Ⅱ nanoprobes and their biological behaviors is particularly important for future probe design and their performance *** the rapid development of NIR-Ⅱ nanoprobes,the distinct role of surface chirality on their biological fates has rarely been ***,chiral NIR-Ⅱ fluorescent Ag_(2)S quantum dots(QDs)are synthesized to investigate the relationship between their chirality and biological functions at both in vitro and in vivo levels.D-/L-Ag_(2)S QDs exhibit significant differences on their interactions with serum proteins,which further affect the cellular *** a result,D-Ag_(2)S QDs can be internalized with higher efficiency(over 2-fold)than that of L-Ag_(2)S ***,in vivo studies reveal that the chirality determines the primary localization of these chiral QDs,where a more efficient renal elimination of D-Ag_(2)S QDs was observed than that of L-Ag_(2)S ***,D-Ag_(2)S QDs show preferential accumulation in tumor region than that of L-Ag_(2)S QDs in orthotopic kidney tumor model,which points out a new avenue of enhancing targeting capabilities of nanoprobes by engineering their surface chirality.

关键词： Chirality NIR-Ⅱprobes Ag_(2)S quantum dots Protein corona Tumor targeting

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Syntax-enhanced pre-trained model 59

Syntax-enhanced pre-trained model

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Joint Conference of the 59th Annual Meeting of the Association for Computational Linguistics and the 11th International Joint Conference on Natural Language processing, ACL-IJCNLP 2021

作者： Xu, Zenan Guo, Daya Tang, Duyu Su, Qinliang Shou, Linjun Gong, Ming Zhong, Wanjun Quan, Xiaojun Jiang, Daxin Duan, Nan School of Computer Science and Engineering Sun Yat-Sen University Guangzhou China Microsoft Research Asia Beijing China Microsoft Search Technology Center Asia Beijing China Guangdong Key Laboratory of Big Data Analysis and Processing Guangzhou China Key Lab. of Machine Intelligence and Advanced Computing Ministry of Education China

ISBN: (纸本)9781954085527

We study the problem of leveraging the syntactic structure of text to enhance pre-trained models such as BERT and RoBERTa. Existing methods utilize syntax of text either in the pre-training stage or in the fine-tuning stage, so that they suffer from discrepancy between the two stages. Such a problem would lead to the necessity of having human-annotated syntactic information, which limits the application of existing methods to broader scenarios. To address this, we present a model that utilizes the syntax of text in both pre-training and fine-tuning stages. Our model is based on Transformer with a syntax-aware attention layer that considers the dependency tree of the text. We further introduce a new pre-training task of predicting the syntactic distance among tokens in the dependency tree. We evaluate the model on three downstream tasks, including relation classification, entity typing, and question answering. Results show that our model achieves state-of-the-art performance on six public benchmark datasets. We have two major findings. First, we demonstrate that infusing automatically produced syntax of text improves pre-trained models. Second, global syntactic distances among tokens bring larger performance gains compared to local head relations between contiguous tokens. © 2021 Association for Computational Linguistics

关键词： Syntactics

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