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Wet-milling synthesis of immobilized Pt/Ir nanoclusters as promising heterogeneous catalysts

Nano Research 2022年第4期15卷 3065-3072页

作者： Peng Du Kai Huang Xiaoyuan Fan Jingteng Ma Naveed Hussain Ruyue Wang Bohan Deng Binghui Ge Haolin Tang Ru Zhang Ming Lei Hui Wu State Key Laboratory of Information Photonics and Optical Communications&School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Institutes of Physical Science and Information Technology Anhui UniversityHefei 230601China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Being a typical state of the art heterogeneous catalyst,supported noble metal catalyst often demonstrates enhanced catalytic ***,a facile synthetic method for realizing large-scale and low-cost supported noble metal catalyst is strictly *** this end,by making use of the strong metal-support interaction(SMSI)and mechanochemical reaction,we introduce an efficient synthetic route to obtain ultrafine Pt and Ir nanoclusters immobilized on diverse substrates by wet chemical *** further demonstrate the scaling-up effect of our approach by large-scale ball-milling production of Pt nanoclusters immobilized on TiO_(2)*** synthesized Pt/Ir@Co_(3)O_(4)catalysts exhibit superior oxygen evolution reaction(OER)performance with only 230 and 290 mV overpotential to achieve current density of 10 and 100 mA·cm^(-2),beating the catalytic performance of Co_(3)O_(4)supported Pt or Ir clusters and commercial Ir/*** is envisioned that the present work strategically directs facile ways for fabricating supported noble metal heterogeneous catalysts.

关键词： heterogeneous catalysts metal clusters wet milling large-scale production strong metal–support interaction

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Internal magnetic-field-enhanced photogenerated charge separation in ferromagnetic TiO_(2)surface heterojunctions

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Journal of materials Science & technology 2023年第29期160卷 240-247页

作者： Guojing Wang Shirong Xiong Yonghui Chen Chunchang Wang Shasha Lv Ke Jia Yunjie Xiang Jianbo Liu Chong Liu Zhengcao Li School of Materials and Energy Lanzhou UniversityLanzhou 730000China State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advanced Materials(MOE)School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Laboratory of Dielectric Functional Materials School of Physics and Material ScienceAnhui UniversityHefei 230601China Key Laboratory of Beam Technology Ministry of EducationCollege of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China School of Materials and Energy Southwest UniversityChongqing 404100China

The use of the internal magnetic field of ferromagnets can effectively promote charge separation and transfer(CST)in photoelectrochemical energy ***,photoelectrochemical materials with a ferromagnetic field are scarce,and the internal magnetic field is negligible in nonferromagnetic *** address this issue,we propose a rational method for preparing ferromagnetic TiO_(2)powder using controllable oxygen vacancies in anatase TiO_(2)with co-exposed{001}and{101}***,an ex-cellent saturation magnetisation of 0.0014 emu/g in TiO_(2)is achieved owing to an asymmetric and uneven charge *** with that of nonferromagnetic TiO_(2),the efficiency of photocatalytic hydro-gen generation of ferromagnetic TiO_(2)is improved by 0.64 *** enhancement of photocatalytic hy-drogen generation is due to the different forces exerted on the electrons and holes in the magnetic field,which significantly improve the photogenerated CST efficiency of ferromagnetic TiO_(2).This result high-lights the significant role of the synergistic regulation of the crystal structure and defects in regulating the ferromagnetic characteristics of *** findings of this study provide guidance for leveraging point defects to promote CST for high-efficiency solar-energy conversion systems.

关键词： Photocatalysis TiO_(2){001}-{101}surface heterojunctions Oxygen vacancies Ferromagnetic

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Thermoelectric Properties of an Individual Suspended Single-Crystalline Sb_(2)Se_(3)Nanowire

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Journal of Thermal Science 2022年第4期31卷 1106-1114页

作者： DU Yanzheng SHI Shaoyi MIAO Tingting MA Weigang MAI Liqiang ZHANG Xing Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China Beijing Key Laboratory of Process Fluid Filtration and Separation College of Mechanical and Transportation EngineeringChina University of PetroleumBeijing 102249China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

Nanowires exhibit excellent thermoelectric performance,due to the stronger quantum confinement and phonon scattering effect compared to bulk ***,it is a challenge to accurately evaluate the thermoelectric performance of *** this paper,the thermoelectric properties of an individual suspended Sb_(2)Se_(3) nanowire have been characterized by comprehensive T-type method,including thermal conductivity,electrical conductivity,Seebeck coefficient and figure of *** thermal conductivity increases from 0.57 W/(m·K)to 3.69 W/(m·K)with temperature increasing from 80 K to 320 *** lattice vibration dominates the heat conduction process,and due to its flawless crystal structure,the thermal conductivity is not lower than the reported values of bulk Sb_(2)Se_(3).The electrical conductivity increases from 7.83 S/m to 688 S/m in the temperature range of 50 K–320 K,which is a great improvement compared with the corresponding bulk *** 294 K,the Seebeck coefficient of the Sb_(2)Se_(3) nanowire is–1120μV/K and the corresponding figure of merit is 0.064.

关键词： Sb_(2)Se_(3)nanowire thermoelectric properties thermal conductivity Seebeck coefficient electrical conductivity

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Fabrication and Characterization of Pressure Sensors Based on Xanthan Gum and Pullulan 16

Fabrication and Characterization of Pressure Sensors Based o...

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16th Textile Bioengineering and Informatics Symposium, TBIS 2023

作者： Zhang, Ya-Qi Liu, Shi-Yao Tao, Yong-Zhen State Key Laboratory for Textile Materials and Advanced Processing Technology Wuhan Textile University Wuhan China College of Material Science and Engineering Wuhan Textile University Wuhan China

ISBN: (纸本)9781713879473

Conductive hydrogels based on biopolymers have potential applications in the field of wearable devices, implantable devices, and human-machine interfaces due to their biocompatibility as well as conductivity. However, hydrogels are prone to water loss under dry atmospheres. In this paper, a biopolymer-based pressure sensor with water retention was designed. Xanthan gum (XG) and pullulan (P) were cross-linked with sodium trimetaphosphate (STMP) to prepare XG5-P-STMP, and polyethylene glycol with a molecular weight of 200 (PEG200) was added into hydrogels to improve moisture retention. The mechanical properties of the hydrogels were investigated by rheologic measurements such as time sweep, frequency sweep, and strain sweep. The results showed that the addition of PEG200 enhanced strength and moisture retention of the hydrogels, and high PEG200 content hindered the recovery property of the hydrogels. Furthermore, the XG5-P-PEG-STMP hydrogel with ionic conductivity and recoverability was explored as a pressure sensor, and the resistance change ratio exhibited repeatable profile. This work provides some valuable information for further applications of natural polysaccharides as intelligent flexible elections. © TBIS 2023. All rights reserved.

关键词： Hydrogels

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Niobium oxyphosphate nanosheet assembled two-dimensional anode material for enhanced lithium storage

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Journal of Energy Chemistry 2021年第2期30卷 268-275,I0009页

作者： Bo Wen Ruiting Guo Xiong Liu Wen Luo Qiu He Chaojiang Niu Jiashen Meng Qi Li Yan Zhao Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070HubeiChina Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528216GuangdongChina

The development of high-capacity and high-rate anodes has become an attractive endeavor for achieving high energy and power densities in lithium-ion batteries(LIBs).Herein,a new-type anode material of reduced graphene oxide(rGO) supported niobium oxyphosphate(NbOPO_4) nanosheet assembled twodimensional composite material(NbOPO_4/rGO) is firstly fabricated and presented as a promising highperformance LIB anode ***-depth electrochemical analyses and in/ex situ characterizations reveal that the intercalation-conversion reaction takes place during the first discharge process,followed by the reversible redox process between amorphous NbPO_4 and Nb which contributes to the reversible capacity in the subsequent ***,the lithiation-generated Li3 PO_4,behaving as a good lithium ion conductor,facilitates ion *** rGO support further regulates the structural and electron/ion transfer properties of NbOPO_4/rGO composite compared to neat NbOPO_4, resulting in greatly enhanced electrochemical *** a result,NbOPO_4/rGO as a new-type LIB anode material achieves a high capacity of 502.5 mAh g^(-1) after 800 cycles and outstanding rate capability of 308.4 mAh g^(-1) at 8 A g^(-1).This work paves the way for the deep understanding and exploration of phosphate-ba sed high-efficiency anode materials for LIBs.

关键词： 2D nanomaterials Niobium oxyphosphate High-rate anode Lithium storage mechanism Lithiation-induced amorphization

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Facile Oxygen-promoted synthesis of Cu,N Co-doped Carbon Composites for Oxygen Reduction

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Journal of Wuhan University of technology(materials Science) 2021年第6期36卷 796-803页

作者： LIU Qianqian GUO Wei PAN Mu TU Wenmao Hubei Key Laboratory of Fuel Cell Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

A new strategy to fabricate oxygen-promoted Cu,N co-doped carbon(OP-CuN@C)composites is *** strategy consists of only two simple steps:chemical polymerization and high temperature *** measurements were conducted to investigate the catalytic activity and mechanism of ORR on the resulting *** the electrochemical results indicate that OP-CuN@C exhibits the best ORR catalytic *** ORR onset potential of OP-CuN@C is slightly lower than that of commercial Pt/C *** good performance is attributed to the large specific surface area,high content of heteroatoms(pyridinic,graphitic nitrogen,and oxygen atom)and synergistic effect between divalent copper and nitrogen dopant.

关键词： oxygen reduction reaction oxygen promotion OP-CuN@C chemical polymerization approach high temperature carbonized method

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Medium-entropy(Me,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)(Me=Y and Ta):Promising thermal barrier materials for high-temperature thermal radiation shielding and CMAS blocking

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Journal of materials Science & technology 2022年第28期123卷 144-153页

作者： Shuaihang Qiu Huimin Xiang Fu-Zhi Dai Hailong Wang Muzhang Huang Chunlei Wan Qing Meng Jiangtao Li Xiaohui Wang Yanchun Zhou Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials and Processing TechnologyBeijing 100076China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

With continuous enhancement of gas-turbine inlet temperature and rapid increase of radiant heat transfer,thermal barrier coating(TBC)materials with a combination of low thermal conductivity and good high-temperature thermal radiation shielding performance play vital roles in ensuring the durability of metallic ***,yttria-stabilized zirconia(YSZ),as the state-of-the-art TBC and current industry standard,is unable to meet such demands since it is almost translucent to high-temperature thermal ***,poor corrosion resistance of YSZ to molten calcia-magnesia-alumina-silicates(CMAS)also impedes its application in sand,dust,or volcanic ash laden *** order to improve the hightemperature thermal radiation shielding performance and CMAS resistance of YSZ and further reduce its thermal conductivity,two medium-entropy(ME)oxide ceramics,ME(Y,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)and ME(Ta,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2),were designed and prepared by pressureless sintering of binary powder compacts in this ***(Y,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)presents cubic structure but a trace amount of secondary phase,while ME(Ta,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)displays a combination of tetragonal phase(81.6 wt.%)and cubic phase(18.4 wt.%).Both ME(Y,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)and ME(Ta,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)possess better high-temperature thermal radiation shielding performance than ***,the high-temperature thermal radiation shielding performance of ME(Ta,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)is superior to that of ME(Y,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)due to its narrower band gap and correspondingly higher infrared absorbance(above 0.7)at the waveband of 1 to 5μ*** two ME oxides also display significantly lower thermal conductivity than YSZ and close thermal expansion coefficients(TECs)to YSZ and Ni-based *** addition,the two ME oxides possess excellent CMAS *** attack by molten CMAS at 1250℃for 4 h,merely~2μm thick penetration

关键词： Medium-entropy ceramics Thermal barrier coatings Thermal radiation shielding CMAS resistance Infrared absorbance

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Tunable Ru-Ru2P heterostructures with charge redistribution for efficient pH-universal hydrogen evolution

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InfoMat 2022年第5期4卷 164-173页

作者： Ding Chen Ruohan Yu Ruihu Lu Zonghua Pu Pengyan Wang Jiawei Zhu Pengxia Ji Dulan Wu Jinsong Wu Yan Zhao Zongkui Kou Jun Yu Shichun Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanChina Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshanChina Nanostructure Research Centre(NRC) Wuhan University of TechnologyWuhanChina State Key Laboratory of Silicate Materials for Architectures International School of Materials Science and EngineeringWuhan University of TechnologyWuhanChina

Designing synergistic heterogeneous catalytic interfaces is the key to developing highly compatible pH-universal electrocatalysts for complex chemical envi*** theoretical calculation results demonstrate that the Ru-Ru2P heterointerface can not only promote the redistribution of charges,but also reduce the d-band center,and then enhances the adsorption capacity of the key ***,in situ and facile synthesis of Ru-Ru2P heterostructures is severely limited by thermodynamic ***,we propose a molten salt-assisted catalytic synthesis scheme,and successfully build a series of homologous metallic Ru-Ru2P heterostructure catalysts with different molar ratios of Ru to P under atmospheric pressure and low-temperature(400C).The resultant Ru-Ru2P with rich heterostructures show the Pt-like HER performance in different pH ***,it is prominent under alkaline conditions(18 mV@10 mA cm^(2)),which outperforms the Pt catalyst(37 mV@10 mA cm^(2)).Furthermore,Ru-Ru2P heterostructures also show certain potential in the electrolysis of seawater to produce *** work represents a significant supplement of high-efficiency pH-universal HER catalysts,and provides a new light on interface engineering in energy technology fields and beyond.

关键词： DFT calculation heterostructure molten salt-assisted synthesis pH-universal hydrogen evolution ruthenium phosphide

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Atomic Level Dispersed Metal–Nitrogen–Carbon Catalyst toward Oxygen Reduction Reaction: synthesis Strategies and Chemical Environmental Regulation

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Energy & Environmental materials 2021年第1期4卷 5-18页

作者： Hengbo Yin Huicong Xia Shuyan Zhao Kexie Li Jianan Zhang Shichun Mu College of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

For development and application of proton exchange membrane fuel cell(PEMFC) energy transformation technology, the cost performance must be elevated for the catalyst. At present, compared with noble metal-based catalysts, such as Pt-based catalysts, atomically dispersed metal–nitrogen–carbon(M–N–C) catalysts are popularity and show great potential in maximizing active site density, high atom utilization and high activity,making them the first choice to replace Pt-based catalysts. In the preparation of atomically dispersed metal–nitrogen–carbon catalyst, it is difficult to ensure that all active sites are uniformly dispersed, and the structure system of the active sites is not optimal. Based on this, we focus on various approaches for preparing M–N–C catalysts that are conducive to atomic dispersion, and the influence of the chemical environmental regulation of atoms on the catalytic sites in different catalysts. Therefore, we discuss the chemical environmental regulation of the catalytic sites by bimetals, atom clusters, and heteroatoms(B, S, and P). The active sites of M–N–C catalysts are explored in depth from the synthesis and characterization, reaction mechanisms, and density functional theory(DFT)calculations. Finally, the existing problems and development prospects of the current atomic dispersion M–N–C catalyst are proposed in detail.

关键词： atomic-level catalyst chemical environmental effects metal-nitrogen-carbon oxygen reduction reaction synthesis strategy

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Preparation of Bi_(2)O_(3)/BiOI Step-scheme Heterojunction Photocatalysts and Their Degradation Mechanism of Methylene Blue

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Journal of Wuhan University of technology(materials Science) 2022年第5期37卷 801-806页

作者： JIANG Xuechao TAN Haiyan SHI Xinyu CHENG Xinhua HU Weibing HU Xinhui Key Laboratory of Green Manufacturing of Super-light Elastomer Materials of State Ethnic Affairs Commission School of Chemistry and Environmental EngineeringHubei Minzu UniversityEnshi445000China Guangxi Key Laboratory of Chemistry and Engineering of Forest Products Guangxi University for NationalitiesNanning530006China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

Bi_(2)O_(3)/BiOI step-scheme(S-scheme) heterojunction photocatalyst was synthesized by green calcination method, its degradation ability of methylene blue was investigated, and the photocatalytic performance of the Bi_(2)O_(3)/BiOI heterojunction, Bi_(2)O_(3) and BiOI was compared. The structure and morphology of the samples were characterized by X-ray diffraction(XRD), field emission scanning electron microscopy(FESEM), and UV-vis diffuse reflection spectrum (UV-vis DRS). The degradation rate of methylene blue was analysised by spectrophotometry, and the calculation result showed that the degradation rate of methylene blue was 97.8% in 150 minutes. The first order kinetic rate constant of 10%Bi_(2)O_(3)/BiOI is 0.021 8 min^(-1), which are2.37 and 2.68 times of BiOI(0.009 18 min^(-1)) and Bi_(2)O_(3) (0.008 03 min^(-1)) respectively. The calculation result shows that the work function of Bi_(2)O_(3) and BiOI are 3.0 e V and 6.0 e V, respectively, by density functional theory(DFT). When this S-scheme heterojunction is used as a photocatalyst, the weaker electrons in the conduction band of BiOI will be combined with the weaker holes in the Bi_(2)O_(3) valence band under combined effect with built-in electric field and band bending, which will retain stronger photoelectrons and holes between Bi_(2)O_(3) and BiOI. This may be the internal reason for the efficient degradation of tetracycline by Bi_(2)O_(3)/BiOI S-scheme heterostructures.

关键词： step-scheme heterojunction methylene blue antibiotic wastewater treatment photocatalytic degradation charge separation

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