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Enhancing Green Ammonia Electrosynthesis Through Tuning sn Vacancies in sn‑Based MXene/ MAX Hybrids

Nano-Micro Letters 2024年第5期16卷 154-168页

作者： Xinyu Dai Zhen‑Yi Du Ying Sun Ping Chen Xiaoguang Duan Junjun Zhang Hui Li Yang Fu Baohua Jia Lei Zhang Wenhui Fang Jieshan Qiu Tianyi Ma Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials of Liaoning Province College of ChemistryInstitute of Clean Energy ChemistryLiaoning UniversityShenyang 110036People’s Republic of China State Key Laboratory of Clean and Efficient Coal Utilization Taiyuan University of TechnologyTaiyuan 030024People’s Republic of China School of Chemistry and Chemical Engineering Anhui UniversityHefei 230601People’s Republic of China School of Chemical Engineering The University of AdelaideAdelaideSA 5005Australia State Key Laboratory of High‑Efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021NingxiaPeople’s Republic of China School of Science RMIT UniversityMelbourneVIC 3000Australia Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640People’s Republic of China College of Chemical Engineering State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical TechnologyBeijing 100029People’s Republic of China

Renewable energy driven N_(2) electroreduction with air as nitrogen source holds great promise for realizing scalable green ammonia production.However,relevant out-lab research is still in its infancy.Herein,a novel sn-based MXene/MAX hybrid with abundant sn vacancies,sn@Ti_(2)CTX/Ti_(2)snC–V,was synthesized by controlled etching sn@Ti_(2)snC MAX phase and demonstrated as an efficient electrocatalyst for electrocatalytic N2 reduction.Due to the synergistic effect of MXene/MAX heterostructure,the existence of sn vacancies and the highly dispersed sn active sites,the obtained sn@Ti2CTX/Ti_(2)snC–V exhibits an optimal NH_(3) yield of 28.4μg h^(−1) mg_(cat)^(−1) with an excellent FE of 15.57% at−0.4 V versus reversible hydrogen electrode in 0.1 M Na_(2)SO_(4),as well as an ultra-long durability.Noticeably,this catalyst represents a satisfactory NH3 yield rate of 10.53μg h^(−1) mg^(−1) in the home-made simulation device,where commercial electrochemical photovoltaic cell was employed as power source,air and ultrapure water as feed stock.The as-proposed strategy represents great potential toward ammonia production in terms of financial cost according to the systematic technical economic analysis.This work is of significance for large-scale green ammonia production.

关键词： Green ammonia synthesis N2 electroreduction Renewable energy sn MXene/MAX hybrid

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sn-decorated CeO_(2) with different morphologies for direct dehydrogenation of ethylbenzene

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Journal of Rare Earths 2024年第1期42卷 102-109,I0004页

作者： Kai Zhang Guoju Cui Mengzhen Yuan Huiwen Huang Ning Li Jiale Xu Guowei Wang Chunyi Li State Key Laboratory of Heavy Oil Processing China University of Petroleum(East China)Qingdao266580China Petrochemical Plant of Sinopec Shengli Oilfield Company Dongying257237China College of Chemical and Biological Engineering Shandong University of Science and TechnologyQingdao266590China

Three sn-decorated ceria catalysts with various morphologies(rods,particles,and cubes)were prepared and applied to the direct dehydrogenation of ethylbenzene.Multi-technology characterizations,including X-ray photoelectro n spectroscopy(XPS),H_(2)-tempe rature programmed reduction(H_(2)-TPR),and Raman spectroscopy,prove that the oxygen vacancies are the active sites for ethylbenzene dehydrogenation,which can be regulated by engineering CeO_(2) morphology and enhanced via introducing metal sn.Given the results of activity test,the catalytic activities for ethylbenzene dehydrogenation over different samples are closely dependent on the amount of oxygen vacancies.The reduced sn-decorated CeO_(2) catalyst with nanoparticles morphology exhibits better dehydrogenation performance than the other two studied catalysts at 600℃.This work provides an effective approach to regulate the active oxygen vacancies and further enhance the dehydrogenation activities through engineering the surface morphology of the catalyst and introducing suitable additives.

关键词： Ethylbenzene dehydrogenation CeO_(2) sn Morphology Oxygen vacancy Rare earths

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High-stable and High-capacity sn/snO_(2)@C as Anode of Lithium-ion Batteries

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Journal of Wuhan University of Technology(Materials Science) 2024年第4期39卷 805-813页

作者：徐天星 WU Jie 李亚娟肖宏 College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China Hunan Provincial Key Laboratory of Micro&Nano Materials Interface Science Central South UniversityChangsha 410083China Hunan Times New Energy Technology Co. LtdLuxi 416100China

We synthesized size-controllable nanoparticles with homogeneous distribution of carbon and sn/snO_(2)by a solvothermal method.The effects of different carbon content and hydrothermal time on the composition,morphology and electrochemical properties of the materials were investigated.Compared with bulk materials,nanoparticles materials not only have high specific surface area,but also can provide abundant reaction sites,thus enhancing the electrochemical activity of electrode materials.More importantly,the optimized microspheres sn/8C-24 delivers a superior electrochemical performance,achieving a specific discharge capacity of 700.4 mAh·g^(-1)after 150 cycles at 0.5 A·g^(-1),and the Coulomb efficiency reaches 98.65%,which is promising for anode of LIBs.

关键词： sn anode nanoparticles hydrothermal method

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Ge掺杂增强R-P结构准二维SrsnO陶瓷杂化非本征铁电性的物理机制研究

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物理学报 2024年

作者：肖志峰王守宇戴雅婷康新淼张振华刘卫芳天津师范大学物理与材料科学学院天津大学理学院天津市低维功能材料物理与制备技术重点实验室

准二维的杂化非本征铁电体在实现强磁电耦合的单相室温多铁性方面具有很大的潜力，然而此类陶瓷样品通常有着较高的矫顽场和较低的剩余极化强度，严重阻碍了对其的研究和应用。本文成功制备了高质量且单相性较好的具有准二维的双层Ruddl... 详细信息

准二维的杂化非本征铁电体在实现强磁电耦合的单相室温多铁性方面具有很大的潜力，然而此类陶瓷样品通常有着较高的矫顽场和较低的剩余极化强度，严重阻碍了对其的研究和应用。本文成功制备了高质量且单相性较好的具有准二维的双层Ruddlesden-Popper(R-P)型氧化物Sr3sn2-xGexO7陶瓷样品，观察到了较高的剩余极化和与Sr3sn2O7单晶接近的矫顽场。微量Ge元素对B位sn掺杂后极化强度显著增强，同时进一步降低了Sr3sn2O7样品的矫顽场。结合晶格动力学研究，我们对样品的拉曼和红外光谱进行了标定，得出掺杂样品铁电性能的增强可能源于氧八面体倾侧幅度的增大和旋转幅度减小。Berry相位法和波恩有效电荷模型进一步证实了铁电性能的增强。通过紫外可见光光度计测试得到Sr3sn2O7样品的光学带隙为3.91eV，与采用Becke-Johnson势结合局部密度近似(MBJ-LDA)所计算的结果基本一致。总之，这项研究为此类杂化非本征铁电体的制备及铁电性能的调控提供了参考，有望促进铁电陶瓷在各种电容器和非易失性存储器件中的广泛应用。

关键词： Sr sn O 杂化非本征铁电性氧八面体倾转第一性原理计算

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BisnO/CeOZ型异质结光催化剂在可见光下降解有机污染物性能研究

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现代化工 2024年

作者：王妮都汪业勇王逸菲沈正千黄江华竺柏康杨淑清舟山市质量技术监督检测研究院浙江海洋大学石油化工与环境学院

利用水热法将Bi2sn2O7纳米颗粒负载到CeO2微球上制备Z型异质结光催化剂并用于光催化降解水污染物。结果表明，当优化的Bi2sn2O7/CeO2(BSC-5)暴露在光照下60min时，盐酸四环素的降解效率达到88.4%(反应速率常数k=0.0334min-1)，是CeO2的8... 详细信息

利用水热法将Bi2sn2O7纳米颗粒负载到CeO2微球上制备Z型异质结光催化剂并用于光催化降解水污染物。结果表明，当优化的Bi2sn2O7/CeO2(BSC-5)暴露在光照下60min时，盐酸四环素的降解效率达到88.4%(反应速率常数k=0.0334min-1)，是CeO2的8.25倍和Bi2sn2O7的4.71倍。Z型异质结可以形成更多暴露的活性中心，具有更好的光电子-空穴对分离效率、优异的氧化还原能力以及有效产生超氧自由基(·O2-)和羟基自由基(·OH)。此外，Bi2sn2O7/CeO2在光催化降解实验中表现出良好的稳定性，经过5次循环后降解效率保持在85%以上。同时，在实验研究的基础上阐明了Bi2sn2O7/CeO2光催化剂的光催化机理。

关键词： Bi sn O /CeO Z型异质结四环素

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One-step hydrothermal synthesis of sn-doped α-Fe_(2)O_(3) nanoparticles for enhanced photocatalytic degradation of Congo red

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Journal of Semiconductors 2022年第12期43卷 22-31页

作者： Van Nang Lam Thi Bich Vu Quang Dat Do Thi Thanh Xuan Le Tien Dai Nguyen T-Thanh-Bao Nguyen Hoang Tung Do Thi Tu Oanh Nguyen Department of Natural Sciences Hoa Lu UniversityNinh NhatNinh Binh CityViet Nam Institute of Theoretical and Applied Research Duy Tan UniversityHanoi 100000Viet Nam Faculty of Natural Sciences Duy Tan UniversityDa Nang 550000Vietnam Institute of Physics Vietnam Academy of Science and Technology10 Dao TanBa DinhHanoiVietnam Institute of Materials Science Vietnam Academy of Science and Technology18 Hoang Quoc VietCaugiayHanoiVietnam

We report on the synthesis of sn-doped hematite nanoparticles(sn-α-Fe_(2)O_(3) NPs)by the hydrothermal method.The prepared sn-α-Fe_(2)O_(3) NPs had a highly pure and well crystalline rhombohedral phase with an average particle size of 41.4 nm.The optical properties of as-synthesizedα-Fe_(2)O_(3) NPs show a higher bandgap energy(2.40-2.57 eV)than that of pure bulkα-Fe_(2)O_(3)(2.1 eV).By doping sn intoα-Fe_(2)O_(3) NPs,the sn-doped hematite was observed a redshift toward a long wavelength with in-creasing sn concentration from 0%to 4.0%.The photocatalytic activity of sn-dopedα-Fe_(2)O_(3) NPs was evaluated by Congo red(CR)dye degradation.The degradation efficiency of CR dye using sn-α-Fe_(2)O_(3) NPs catalyst is higher than that of pureα-Fe_(2)O_(3) NPs.The highest degradation efficiency of CR dye was 97.8%using 2.5%sn-dopedα-Fe_(2)O_(3) NPs catalyst under visible-light irradi-ation.These results suggest that the synthesized sn-dopedα-Fe_(2)O_(3) nanoparticles might be a suitable approach to develop a photocatalytic degradation of toxic inorganic dye in wastewater.

关键词： α-Fe_(2)O_(3)nanoparticles sn Congo red photocatalytic properties photodegradation

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Phase-separated bimetal enhanced sodium storage:Dimer-like sn-Bi@C heterostructures with high capacity and long cycle life

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Journal of Energy Chemistry 2023年第4期79卷 468-476页

作者： Xiaoxiao Hou Yansong Zhu Qian Yao Jinmei Song Chunsheng Wang Yanli Zhou Suyuan Zeng Jian Yang Yitai Qian Key Laboratory of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShandong UniversityJinan 250100ShandongChina Department of Environmental and Material Engineering Yantai UniversityYantai 264005ShandongChina Department of Chemistry and Chemical Engineering Liaocheng UniversityLiaocheng 252059ShandongChina Hefei National Laboratory for Physical Science at Microscale Department of ChemistryUniversity of Science and Technology of ChinaHefei 230026AnhuiChina

Phase boundaries facilitate the charge transportation and alleviate the intrinsic stress upon cycles.Therefore,how to achieve regular phase boundaries is very attractive.Herein,dimer-like sn-Bi@C nanostructures,where is a well-defined phase boundary between sn and Bi,have been prepared by a two-step process for the first time.The phase boundary not only provides additional and fast transportation for Na+,but also mitigates the structure stress/strain upon cycling.Therefore,sn-Bi@C exhibits a high capacity(472.1 m A h g^(-1)at 2 A g^(-1)for 200 cycles),an ultra-long cyclic life(355.6 mA h g^(-1)at 5 A g^(-1)for 4500cycles)and an excellent rate performance(372 mA h g^(-1)at 10 A g^(-1))for sodium storage,much higher than those of sn@C,Bi@C,and sn@C+Bi@C.Notably,the full cells of sn-Bi@C//Na_(3)V_(2)(PO_(4))_(3)/rGO(snBi@C//NVP/rGO)demonstrate impressive performance(323 mA h g^(-1)at 2 A g^(-1)for 300 cycles).The underlying mechanism for such an excellent performance is elucidated by in-situ X-ray diffraction,exsitu scanning electron microscopy/high-resolution transmission electron microscopy and atomic force microscopy,revealing the good electrode stability and improved mechanical properties of sn-Bi@C.The synthetic method is extended to dimer-like sn-Pb@C and sn-Ag@C heterostructures,which also exhibit the good cycle stability for sodium storage.

关键词： Bi sn Alloy-type anodes Sodium-ion batteries Phase boundaries

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Effect of V and sn on microstructure and mechanical properties of gray cast iron

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China Foundry 2022年第5期19卷 427-434页

作者： Yi-li Li Rui-run Chen Qi Wang Wen-chao Cao Xin-xiu Wang Yuan Xia Guo-ping Zhou Ying-dong Qu Guang-long Li School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Yangzhou Wutingqiao Cylinder Liner Co. Ltd.Yangzhou 225000JiangsuChina School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

The cylinder liner is one of the important parts of a diesel engine.Gray cast iron is the main material for manufacturing cylinder liners due to its good casting performance,convenient processing performance,good wear resistance and low cost.In the present work,the effects of vanadium(V)and tin(sn)on the microstructure and properties of gray cast iron were studied.Results show that increasing the contents of V and sn can not only refine the graphite,but also reduce the pearlite lamellar space.The graphite size and lamellar spacing of pearlite are firstly reduced and then increased.Pearlite quantity reaches over 98%after adding V and sn.Adding V and sn can promote the precipitation and solid solution strengthening of gray cast iron,so as to improve the mechanical properties.The Brinell hardness reaches the peak of 424 HB at the contents of 0.21wt.%V and 0.06wt.%sn,and the sample containing 0.11wt.%V and 0.08wt.%sn shows the highest compressive strength and tensile strength of 1,699 MPa and 515 MPa,respectively.The main strengthening mechanism comes from the solid solution strengthening and fine grain strengthening of V and sn.

关键词： V sn gray cast iron cylinder liner microstructure mechanical properties

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Flexible Conductive Anodes Based on 3D Hierarchical sn/NS-CNFs@rGO Network for Sodium-Ion Batteries

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Nano-Micro Letters 2019年第4期11卷 133-146页

作者： Linqu Luo Jianjun Song Longfei Song Hongchao Zhang Yicheng Bi Lei Liu Longwei Yin Fengyun Wang Guoxiu Wang College of Physics and State Key Laboratory of Bio-Fibers and Eco-Textiles Qingdao UniversityQingdao 266071People’s Republic of China College of Electromechanical Engineering Qingdao University of Science and TechnologyNo.99 Songling RoadQingdao 260061ShandongPeople’s Republic of China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590People’s Republic of China School of Materials Science and Engineering Shandong UniversityJinan 250061People’s Republic of China Centre for Clean Energy Technology University of Technology SydneyBroadwaySydneyNSW 2007Australia

Metallic sn has provoked tremendous progress as an anode material for sodium-ion batteries(SIBs).However,sn anodes suffer from a dramatic capacity fading,owing to pulverization induced by drastic volume expansion during cycling.Herein,a flexible three-dimensional(3D)hierarchical conductive network electrode is designed by constructing sn quantum dots(QDs)encapsulated in one-dimensional N,S codoped carbon nanofibers(NS-CNFs)sheathed within two-dimensional(2D)reduced graphene oxide(rGO)scrolls.In this ingenious strategy,1D NS-CNFs are regarded as building blocks to prevent the aggregation and pulverization of sn QDs during sodiation/desodiation,2D rGO acts as electrical roads and“bridges”among NS-CNFs to improve the conductivity of the electrode and enlarge the contact area with electrolyte.Because of the unique structural merits,the flexible 3D hierarchical conductive network was directly used as binder-and current collectorfree anode for SIBs,exhibiting ultra-long cycling life(373 mAh g?1 after 5000 cycles at 1 A g?1),and excellent high-rate capability(189 mAh g?1 at 10 A g?1).This work provides a facile and efficient engineering method to construct 3D hierarchical conductive electrodes for other flexible energy storage devices.

关键词： Flexible electrodes N S co-doped carbon nanofibers Reduced graphene oxide sn quantum dots Sodium-ion batteries

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sn对铸态Mg-5Gd-3Y-0.5Zr合金组织和力学性能的影响

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稀土 2022年第2期43卷 91-98页

作者：张迁李全安陈晓亚戚尧史浩鹏河南科技大学材料科学与工程学院河南洛阳471023 有色金属共性技术河南省协同创新中心河南洛阳471023

采用X射线衍射仪、光学显微镜、扫描电镜、能谱仪和电子拉伸试验机,研究了不同sn含量对Mg-5Gd-3Y-0.5Zr合金显微组织、力学性能以及拉伸断口形貌的影响。结果表明,铸态Mg-5Gd-3Y-0.5Zr合金主要由基体α-Mg、Mg_(5)Gd和Mg_(24)Y_(5)相组... 详细信息

采用X射线衍射仪、光学显微镜、扫描电镜、能谱仪和电子拉伸试验机,研究了不同sn含量对Mg-5Gd-3Y-0.5Zr合金显微组织、力学性能以及拉伸断口形貌的影响。结果表明,铸态Mg-5Gd-3Y-0.5Zr合金主要由基体α-Mg、Mg_(5)Gd和Mg_(24)Y_(5)相组成,sn的添加能够细化合金组织,在合金中生成新相sn_(3)Y_(5),促进合金中第二相的析出。Mg-5Gd-3Y-0.5Zr-0.5sn合金中第二相呈现出分布均匀的颗粒状,Mg-5Gd-3Y-0.5Zr-1.0sn合金中部分区域出现了长条状第二相,Mg-5Gd-3Y-0.5Zr-1.5sn合金中部分区域出现了方块状第二相。在本文研究范围内,随着sn含量的增加,合金的抗拉强度、伸长率以及布氏硬度都呈现出先上升后下降的趋势。sn含量为0.5%时,铸态合金综合性能最好,此时合金的抗拉强度、伸长率以及布氏硬度分别为177 MPa、6.87%和57.47 HBW,与无sn合金相比分别提高了5.36%、12.25%和11.96%。

关键词： Mg-5Gd-3Y-0.5Zr合金 sn 显微组织力学性能

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