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Impact of doping profiles on the formation of laser-active centers in bismuth-doped GeO_(2)–SiO_(2)glass fibers

Photonics Research 2024年第2期12卷 260-270页

作者： SERGEY ALYSHEV ALEXANDER VAKHRUSHEV ALEKSANDR KHEGAI ELENA FIRSTOVA KONSTANTIN RIUMKIN MIKHAIL MELKUMOV LYUDMILA ISKHAKOVA ANDREY UMNIKOV SERGEI FIRSTOV Prokhorov General Physics Institute of the Russian Academy of Sciences Dianov Fiber Optics Research Center119333 MoscowRussia Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences 603951 Nizhny NovgorodRussia

Multi-wavelength-band transmission technology based on the exploitation of the extended spectral region is considered as a potential approach to increase the transmission capacity in the deployed fiber-optic communication infrastructure.The development of optical amplifiers operating in the O-,E-,S-,and U-telecom bands is an extremely important challenge for the successful implementation of this technology.bismuth-doped fibers are of increasing interest as gain materials,which can be used to provide broadband amplification in the mentioned telecom bands.This is due to the ability of Bi ions incorporated into glass network to form bismuth active centers(BACs)with specific optical properties,which are primarily determined by the glass modifiers.In this work,the impact of the doping profiles of both Ge atoms as glass modifiers and Bi ions on the BACs formation is studied using a series of bismuth-doped fibers fabricated by the modified chemical vapor deposition(MCVD)technique.The Bi-to-BACs conversion efficiency in various spatial regions of the studied samples is presented.It is turned out that for high-Bi concentration regions,the conversion efficiency is very low(less than 10%).In addition,the relationship of the conversion efficiency to the distribution of Bi ions and/or Ge atoms is discussed.Finally,a continuous-wave laser at 1.46μm with a record slope efficiency of 80%is demonstrated using a Bi-doped fiber with confined doping profile,where the Bi-to-BACs conversion efficiency is 35%.This paper provides new information which might help to facilitate understanding of the features of Bi-doped fibers and their potentially achievable characteristics.

关键词： fiber fibers bismuth

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Solid Bi_(2)O_(3)-derived nanostructured metallic bismuth with high formate selectivity for the electrocatalytic reduction of CO_(2)

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International Journal of Minerals,Metallurgy and Materials 2024年第4期31卷 803-811页

作者： Xiaoyan Wang Safeer Jan Zhiyong Wang Xianbo Jin College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan 430072China Engineering Research Center of Organosilicon Compounds&Materials Ministry of EducationWuhan 430072China

CO_(2) electrochemical reduction(CO_(2)ER)is an important research area for carbon neutralization.However,available catalysts for CO_(2) reduction are still characterized by limited stability and activity.Recently,metallic bismuth(Bi)has emerged as a promising catalyst for CO_(2) ER.Herein,we report the solid cathode electroreduction of commercial micronized Bi2O3as a straightforward approach for the preparation of nanostructured Bi.At-1.1 V versus reversible hydrogen electrode in a KHCO3aqueous electrolyte,the resulting nanostructure Bi delivers a formate current density of~40 mA·cm^(-2) with a current efficiency of~86%,and the formate selectivity reaches97.6% at-0.78 V.Using nanosized Bi2O3as the precursor can further reduce the primary particle sizes of the resulting Bi,leading to a significantly increased formate selectivity at relatively low overpotentials.The high catalytic activity of nanostructured Bi is attributable to the ultrafine and interconnected Bi nanoparticles in the nanoporous structure,which exposes abundant active sites for CO_(2) electrocatalytic reduction.

关键词： bismuth carbon dioxide electrocatalysis formate solid electroreduction

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In situ observation of the phase transformation kinetics of bismuth during shock release

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Chinese Physics B 2024年第4期33卷 586-592页

作者：李江涛王倩男徐亮柳雷张航 Sota Takagi Kouhei Ichiyanagi Ryo Fukaya Shunsuke Nozawa 胡建波 Laboratory for Shock Wave and Detonation Physics Research Institute of Fluid PhysicsChina Academy of Engineering PhysicsMianyang 621900China State Key Laboratory for Environment-Friendly Energy Materials Southwest University of Science and TechnologyMianyang 621010China Japan Society for the Promotion of Science Tokyo102-0083Japan Institute of Materials Structure Science High Energy Accelerator Research OrganizationIbaraki305-8572Japan

A time-resolved x-ray diffraction technique is employed to monitor the structural transformation of laser-shocked bismuth.Results reveal a retarded transformation from the shock-induced Bi-Ⅴphase to a metastable Bi-Ⅳphase during the shock release,instead of the thermodynamically stable Bi-Ⅲphase.The emergence of the metastable Bi-Ⅳphase is understood by the competitive interplay between two transformation pathways towards the Bi-Ⅳand Bi-Ⅲ,respectively.The former is more rapid than the latter because the Bi-Ⅴto B-Ⅳtransformation is driven by interaction between the closest atoms while the Bi-Ⅴto B-Ⅲtransformation requires interaction between the second-closest atoms.The nucleation time for the Bi-Ⅴto Bi-Ⅳtransformation is determined to be 5.1±0.9 ns according to a classical nucleation model.This observation demonstrates the importance of the formation of the transient metastable phases,which can change the phase transformation pathway in a dynamic process.

关键词： phase transformation time-resolved x-ray diffraction(XRD) bismuth metastable phase nonequilibrium phase diagram

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Layered coordination polymer with two-dimensional covalent bismuth-organic networks:Semiconductor and lithium ion storage

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Nano Research 2024年第3期17卷 2181-2185页

作者： Mu-Qing Li Yulin Cao Lei Qin Hua Cheng Weimin Yang Zhouguang Lu School of Materials Science and Environmental Engineering Shenzhen Polytechnic UniversityShenzhen 518055China Industrial Training Center Shenzhen Polytechnic UniversityShenzhen 518055China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Chemistry Southern University of Science and TechnologyShenzhen 518055China

Single crystals of a bismuth-based coordination polymer(CP)with carboxyl-thiol ligands,[Bi(C_(8)H_(2)O_(4)S_(2))(C2H8N)]n(Bi-DSBDC-DMA,DMBDC=2,5-disulfur-1,4-dicarboxylate,DMA=dimethylamine),have been successfully synthesized.X-ray diffraction analysis reveals that Bi-DSBDC-DMA possesses a layered structure,with two-dimensional(2D)Bi-DSBDC networks alternating with layers composed of dimethylamine ions.This material demonstrates semiconducting properties,featuring an optical bandgap of 2.2 eV and an electrical conductivity of 2×10^(-8) S/cm.Furthermore,electrodes based on this material exhibit a capacity of 250 mAh/g after 200 cycles for lithium-ion storage.

关键词： bismuth layer coordination polymer(CP) semiconductor lithium ion storage

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Photoinduced bismuth vanadate-catalyzed C(sp^(2))-H functionalization

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Chinese Chemical Letters 2024年第3期35卷 1-2页

作者： Rong-Nan Yi Wei-Min He Key Laboratory of Food&Environment&Drug Monitoring and Testing of Universities in Hunan Province Hunan Police AcademyChangsha 410138China School of Chemistry and Chemical Engineering University of South ChinaHengyang 421001China

Visible light-induced organic reactions have gained much attention in recent years due to their mild conditions and high efficiency[1,2].In this context,many efficient photocatalysts including transition metal complex... 详细信息

关键词： bismuth catalyzed gained

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Soil Profile Concentration Distributions of Antimony and bismuth across Southeastern Missouri (USA)

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Journal of Environmental Protection 2024年第5期15卷 537-551页

作者： Michael Aide Department of Agriculture Southeast Missouri State University Cape Girardeau MO USA

Recent research has suggested that increased industrial and technological utilization of antimony and bismuth necessitates greater research to determine the soil and water chemistry and the environmental risks associated with these elements. The near-total soil profile concentrations of antimony and bismuth were determined for key soil series across southeastern Missouri. The antimony concentrations ranged from 0.65 to 0.08 mg kg−1, whereas the bismuth soil profile concentrations ranged from 0.92 to 0.03 mg kg−1. Most pedons showed antimony concentrations ranging from 20 to 30 mg kg−1, whereas bismuth concentrations were commonly 10 to 20 mg kg−1. For soils having argillic horizons, antimony and bismuth concentrations were greater for the illuvial horizons than the eluvial horizons, whereas Entisols, Inceptisols, and one Vertisol showed rather uniform antimony and bismuth concentrations, features paralleling the soil texture distribution. Both antimony and bismuth showed significant correlations with iron.

关键词： Trace Elements Antimony bismuth Soils Group 15

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Ultra-high-rate Bi anode encapsulated in 3D lignin-derived carbon framework for sodium-ion hybrid capacitors

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Rare Metals 2024年第3期43卷 1037-1047页

作者： Ze-Hua Lin Xue-Qing Qiu Xi-Hong Zu Xiao-Shan Zhang Lei Zhong Shi-Rong Sun Shu-Hua Hao Ying-Juan Sun Wen-Li Zhang School of Chemical Engineering and Light Industry Guangdong University of Technology(GDUT)Guangzhou510006China Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory(Rongjiang Laboratory) Jieyang515200China School of Advanced Manufacturing Institute of Green Chemistry and Advanced MaterialsGuangdong University of TechnologyJieyang515200China

bismuth(Bi),as an alloy-based anode material,has attracted much atte ntion in the developme nt of sodiumion hybrid capacitors(SIHCs)due to its high theoretical capacity.However,the volume expansion of the Bi-based anode during the sodiation/desodiation process results in limited rate capability.In the present work,a porous Bi-based composite was constructed by a one-step hydrothermal method,and Bi was encapsulated in ligninderived nitrogen-doped porous carbon(Bi@LNPC)after carbonization.The obtained Bi nanoparticles could effectively adapt to the strain and shorten the diffusion distance of Na^(+).In addition,porous carbon skeleton provides a rigid conductive network for electronic transportation.Therefore,the assembled sodium-ion half-cell with Bi@LNPC anode shows ultra-high-rate capability.When the current density was enhanced from 0.1 to 50 A·g^(-1),the specific capacity decreased slightly from 351.5 to 342.8 mAh·g^(-1).Even at an extremely high current density of 200 A·g^(-1),it retains 81.3%capacity retention when compared to a current density of 1 A·g^(-1).The SIHCs assembled by Bi@LNPC show a high energy density of 63 Wh·kg^(-1).This work provides an effective method for developing high-rate Bi anode materials for sodium-ion hybrid capacitors(SIHCs)and sodium-ion batteries(SIBs).

关键词： bismuth Lignin Sodium-ion batteries Sodium-ion hybrid capacitors Rate Porous carbon

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bismuth-based materials for rechargeable aqueous batteries and water desalination

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Rare Metals 2022年第1期41卷 287-303页

作者： Xiao-Jing Dai Xin-Xin Niu Wang-Qin Fu Dong Zheng Wen-Xian Liu Wen-Hui Shi Jian-Wei Nai Fang-Fang Wu Xie-Hong Cao School of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China Center for Membrane Separation and Water Science&Technology College of Chemical EngineeringZhejiang University of TechnologyHangzhou 310014China

Aqueous batteries and seawater desalination have received considerable attention in recent years due to their merits as high safety,environmental friendliness and cost-effectiveness.However,the scarcity of highly match electrode materials hinders their development.The exploration of high performance and low cost electrode materials is crucial for their potential applications.bismuth(Bi),with high energy density and low redox potential,shows perspective in the field of aqueous batteries and seawater desalination,and significant progress has been achieved in the past decades.In this review,the unique properties and synthetic methods of Bi-based electrodes,as well as their applications are comprehensively summarized and discussed.The commonly used preparation methods of Bibased electrodes,including hydrothermal method,electrodeposition method,etc.,are introduced.Then,the applications of the Bi-based composites in aqueous batteries,such as Ni//Bi batteries and water desalination,are summarized.Finally,the challenges and future research direction of Bi-based materials are proposed.

关键词： bismuth Aqueous batteries Desalination Capacitive deionization Derivatives

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bismuth stabilized by ZIF derivatives for electrochemical ammonia production:Proton donation effect of phosphorus dopants

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Nano Research 2023年第4期16卷 4574-4581页

作者： Qiaoling Wu Ying Sun Qin Zhao Hui Li Zhengnan Ju Yu Wang Xiaodong Sun Baohua Jia Jieshan Qiu Tianyi Ma Institute of Clean Energy Chemistry Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials of Liaoning ProvinceCollege of ChemistryLiaoning UniversityShenyang 110036China School of Science RMIT UniversityMelbourneVIC 3000Australia College of Chemical Engineering State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical TechnologyBeijing 100029China

N2 electroreduction reaction(NRR)offers a feasible and promising alternative for NH_(3)production by using clean energy sources.However,it is still obstructed by the pretty low NH3 yield rate and Faradaic efficiency(FE)primarily due to the undesired competing hydrogen evolution reaction and the extremely stable N≡N bond.Herein,bismuth nanoparticles were successfully embedded in N and P co-doped carbon nanoflakes(Bi/NPC)by high-temperature pyrolyzation of Bi-zeolitic imidazole frameworks(ZIF)followed by phosphorization,and used as a high-efficiency catalyst toward N2 electroreduction to NH3.In 0.1 M KHCO_(3)electrolyte,Bi/NPC exhibits excellent NRR performances,including a high NH3 yield rate of 3.12μg·h^(−1)·cm^(−2)(−0.6 V vs.reversible hydrogen electrode(RHE)),an outstanding FE of 13.58%(−0.4 V vs.RHE),and a remarkable stability up to 36 h under ambient conditions.This outstanding NRR catalytic activity is mainly attributed to the intrinsic electrocatalytic NRR activity combined with the inert hydrogen evolution reaction(HER)activity of Bi,the adsorption and activation of N2 facilitated by N dopants,as well as the superior conductivity and the large specific surface area of the two-dimensional layered carbon matrix.Notably,the hydrogen source provided by P dopant promotes the hydrogenation of the adsorbed N,which further boosts the NRR performance in alkaline electrolyte.The ultralong durability of Bi/NPC is attributed to the highly dispersed bismuth catalytic active centers confined in the skeleton of N and P co-doped carbon nanoflakes,which inhibits the agglomeration of bismuth centers.This work presents a novel avenue for designation and fabrication of high-performance Bi-based electrocatalysts for NRR.

关键词： N2 reduction bismuth N P co-doped carbon nanoflakes electrocatalysis

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Regulating the Electron Localization of Metallic bismuth for Boosting CO_(2)Electroreduction

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Nano-Micro Letters 2022年第2期14卷 296-310页

作者： Dan Wu Renfei Feng Chenyu Xu Peng-Fei Sui Jiujun Zhang Xian-Zhu Fu Jing-Li Luo Shenzhen Key Laboratory of Polymer Science and Technology Guangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China Canadian Light Source Inc. SaskatoonSaskatchewan S7N 0X4Canada Department of Chemical and Materials Engineering University of AlbertaEdmontonAB T6G 1H9Canada Institute for Sustainable Energy/College of Science Shanghai UniversityShanghai 200444People’s Republic of China

Electrochemical reduction of CO_(2)to formate is economically attractive but improving the reaction selectivity and activity remains challenging.Herein,we introduce boron(B)atoms to modify the local electronic structure of bismuth with positive valence sites for boosting conversion of CO_(2)into formate with high activity and selectivity in a wide potential window.By combining experimental and computational investigations,our study indicates that B dopant differentiates the proton participations of rate-determining steps in CO_(2)reduction and in the competing hydrogen evolution.By comparing the experimental observations with the density functional theory,the dominant mechanistic pathway of B promoted formate generation and the B concentration modulated effects on the catalytic property of Bi are unravelled.This comprehensive study offers deep mechanistic insights into the reaction pathway at an atomic and molecular level and provides an effective strategy for the rational design of highly active and selective electrocatalysts for efficient CO_(2)conversion.

关键词： CO_(2)reduction bismuth Proton transport Electron localization Boron

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