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Journal of Environmental Sciences 2024年第2期136卷 213-225页

作者： Bowen Xu Jiaxin Qu Xueqian Wang Langlang Wang Yu Pu Ping Ning Yibing Xie Yixing Ma Qiang Ma Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China School of Architecture and Civil Engineering Chengdu UniversityChengdu 610106China

To investigate the enhancing effect of mn on the performance of simultaneous catalytic oxidation of AsH_(3)and PH_(3)by CuO-Al_(2)O_(3)in a reducing atmosphere under micro-oxygen conditions,Cu-mn modifiedγ-Al_(2)O_(3)catalysts were prepared.The characteristics of the catalysts showed that mn reduced the crystallinity of the active CuO component,increased the number of oxygen vacancies and acidic sites on the catalyst surface,enhanced the mobility of surface oxygen,and the interaction between copper and manganese promoted the redox cycling ability of the catalysts and improved their oxidation performance,which increased the conversion frequency(TOF)by 2.54×10^(-2)to 3.07×10^(-2)sec^(-1).On the other hand,the introduction of mn reduced the production of phosphate and As_(2)O_(3)on the catalyst surface by30.96%and 44.9%,which reduced the coverage and inerting of the active sites by phosphate and As_(2)O_(3),resulting in an 8 hr(6 hr)improvement in the stability of PH_(3)(AsH_(3))removal.

关键词： AsH_(3)-PH_(3)removal Oxygen activation mn doping Stability enhancement

mn-doping induced electronic modulation and rich oxygen vacancies on vertically grown NiFe2O4 nanosheet array for synergistically triggering oxygen evolution reaction

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Nano Research 2022年第5期15卷 3940-3945页

作者： Yonghao Gan Meilin Cui Xiaoping Dai Ying Ye Fei Nie Ziteng Ren Xueli Yin Baoqiang Wu Yihua Cao Run Cai Xin Zhang State Key Laboratory of Heavy Oil Processing College of Chemical Engineering and EnvironmentChina University of PetroleumBeijing 102249China

Large-scale electrolysis of water to produce high-purity hydrogen is one of the effective ways to solve the energy crisis and environmental pollution problems.However,efficient,cheap and stable catalysts are one of the bottlenecks for industrial application in water splitting.Herein,a facile one-step hydrothermal process was applied to fabricate mn-doped nickel ferrite nanosheets(mn-NiFe_(2)O_(4))which shown a low overpotential of 200 mV at 50 mA·cm^(-2)and a small Tafel slope of 47 mV·dec^(-1),together with a prominent turnover frequency(TOF)value(0.14 s^(-1))and robust stability.The in-situ UV-vis spectroscopy unveiled the surface reconstruction to generate NiOOH as active sites during oxygen evolution reaction(OER).The excellent electrocatalytic activity of mn-NiFe_(2)O_(4)is attributed to the vertically grown nanosheets for exposure more active sites,rich oxygen vacancies,and the hybridization between Ni 3d and O 2p orbitals caused by mn doping.This work should provide a facile strategy by mn-doping to simultaneously engineer oxygen vacancies and electronic structure for synergistically triggering oxygen evolution reaction.

关键词： mn doping NiFe_(2)O_(4)nanosheets oxygen vacancies electronic modulation oxygen evolution reaction

Comprehensive optimization of piezoelectric coefficient and depolarization temperature in mn-doped Bi_(0.5)Na_(0.5)TiO_(3)-Bi_(0.5)K_(0.5)TiO_(3)-BaTiO_(3)lead-free piezoceramics

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Journal of Materials Science & Technology 2024年第5期172卷 255-263页

作者： Huashan Zheng Enwei Sun Huajie Luo Xiaoyu Zhang Yixiao Yang Bin Yang Rui Zhang Shantao Zhang Wenwu Cao Condensed Matter Science and Technology Institute School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin150080China Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing100083China National Laboratory of Solid State Microstructures Department of Materials Science and EngineeringCollege of Engineering and Applied Science&Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China Department of Mathematics and Materials Research Institute The Pennsylvania State UniversityUniversity ParkPennsylvania16802United States of America

Lead-free Bi_(_(0.5))Na_(_(0.5))TiO_(3)(BNT)piezoelectric ceramics have the advantages of large coercive fields and high Curie temperatures.But the improvement of piezoelectric coefficient(d 33)is usually accompanied by a huge sacrifice of depolarization temperature(T d).In this work,a well-balanced performance of d 33 and T d is achieved in mnO_(2)-doped 0.79(Bi_(_(0.5))Na_(_(0.5))TiO_(3))-0.14(Bi_(0.5)K_(0.5)TiO_(3))-0.07BaTiO_(3)ternary ceramics.The in-corporation of 0.25 mol%mnO_(2)enhances the d 33 by more than 40%,while T d remains almost unchanged(i.e.,d 33=181 pC/N,T d=184℃).X-ray diffraction(XRD)shows that an appropriate fraction of the small axis-ratio ferroelectric phase(pseudo-cubic,P c)coexists with the long-range ferroelectric phase(tetrag-onal,T)under this mnO_(2)doping.Piezoelectric force microscopy(PFM)has revealed a special domain configuration,namely large striped and layered macro domains embedded with small nanodomains.This study provides a distinctive avenue to design BNT-based piezoelectric ceramics with high piezoelectric performance and temperature stability.

关键词： BNT-BKT-BT ceramics mn doping Piezoelectric Depolarization temperature Phase structure

Facile preparation and efficient mnxCoy porous nanosheets for the sustainable catalytic process of soot

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Green Energy & Environment 2024年第3期9卷 516-528页

作者： Miaomiao Hu Kun Zhou Tingyi Zhao Zheng Li Xianhai Zeng Di Yu Xuehua Yu Mingqin Zhao Zhihui Shao Qixiang Xu Bing Cui Flavors and Fragrance Engineering&Technology Research Center of Henan Province College of Tobacco ScienceHenan Agricultural UniversityZhengzhou450002China School of Ecology and Environment Zhengzhou UniversityZhengzhou450001China College of Energy Xiamen UniversityXiamen361102China College of Chemistry and Chemical Engineering Shenyang Normal UniversityShenyang110034China

The pursuit of high-performance is worth considerable effort in catalysis for energy efficiency and environmental sustainability. To develop redox catalysts with superior performance for soot combustion, a series of mn_(x)Co_(y) oxides were synthesized using MgO template substitution.This method greatly improves the preparation and catalytic efficiency and is more in line with the current theme of green catalysts and sustainable development. The resulting mn_(1)Co_(2.3) has a strong activation capability of gaseous oxygen due to a high concentration of Co^(3+) and mn^(3+). The mn doping enhanced the intrinsic activity by prompting oxygen vacancy formation and gaseous oxygen adsorption. The nanosheet morphology with abundant mesoporous significantly increased the solid–solid contact efficiency and improved the adsorption capability of gaseous reactants. The novel design of mn_(1)Co_(2.3)oxide enhanced its catalytic performance through a synergistic effect of mn doping and the porous nanosheet morphology, showing significant potential for the preparation of high-performance soot combustion catalysts.

关键词： Soot combustion Intrinsic activity Contact efficiency mn doping DFT

mn doping effects on the gate-tunable transport properties of Cd3As2 films epitaxied on GaAs

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Journal of Semiconductors 2020年第7期41卷 33-38页

作者： Hailong Wang Jialin Ma Qiqi Wei Jianhua Zhao State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering&CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Beijing Academy of Quantum Information Sciences Beijing 100193China

The mn doping effects on the gate-tunable transport properties of topological Dirac semimetal Cd3As2 films have been investigated.mn-doped Cd3As2 films are directly grown on GaAs(111)B substrates by molecular-beam epitaxy,during which the single crystal phase can be obtained with mn concentration less than 2%.Shubnikov-de Haas oscillation and quantum Hall effect are observed at low temperatures,and electrons are found to be the dominant carrier in the whole temperature range.Higher mn content results in smaller lattice constant,lower electron mobility and larger effective band gap,while the carrier density seems to be unaffected by mn-doping.Gating experiments show that Shubnikov-de Haas oscillation and quantum Hall effect are slightly modulated by electric field,which can be explained by the variation of electron density.Our results provide useful information for understanding the magnetic element doping effects on the transport properties of Cd3As2 films.

关键词： molecular-beam epitaxy Dirac semimetal Cd3As2 film mn doping quantum transport

Effect of mn doping on mechanical properties and electronic structure of WCoB ternary boride by first-principles calculations

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Chinese Physics B 2018年第10期27卷 537-547页

作者：张桐尹海清张聪曲选辉郑清军 Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing Beijing 100083 China Beijing Key Laboratory of Materials Genome Initiative University of Science and Technology Beijing Beijing 100083 China Kennametal Inc 1600 Technology Way PA 15650 USA

The first-principles calculations are performed to investigate the structural, mechanical property, hardness, and electronic structure of WCoB with 0, 8.33, 16.67, 25, and 33.33 at.% mn doping content and W_2 CoB_2 with 0, 10, and 20 at.%mn doping content. The cohesive energy and formation energy indicate that all the structures can retain good structural stability. According to the calculated elastic constants, mn is responsible for the increase of ductility and Poisson＇s ratio and the decrease of Young＇s modulus, shear modulus, and bulk modulus. By using the population analysis and mechanical properties, the hardness is characterized through using the five hardness models and is found to decrease with the mn doping content increasing. The calculated electronic structure indicates that the formation of a B–mn covalent bond and a W–mn metallic bond contribute to the decreasing of the mechanical properties.

关键词： mn doping WCoB electronic structure first-principles calculations

Microstructure and shear properties evolution of mn-doped SAC solder joint under isothermal aging

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Journal of Iron and Steel Research(International) 2023年第8期30卷 1650-1660页

作者： Cheng-ming Li Shu-jin Chen Shan-shan Cai Ju-bo Peng Xiao-jing Wang Ying-wu Wang School of Material Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina R&D Center Yunnan Tin Group(Holding)Co.Ltd.Kunming 650000YunnanChina Modern School of Engineering Yunnan UniversityKunming 650091YunnanChina

The effects of mn addition(0.005,0.01,0.03,0.05,and 0.07 wt.%)on microstructure,shear mechanical behavior,and interfacial thermal stabilities of SAC305 joints were investigated under isothermal aging temperatures of 170 C with different aging time(0,250,500,and 750 h).It is found that mn addition can increase fracture energy of joints without decreasing the shear strength.And the microstructures have transformed from the eutectic net-like structure in SAC305 solder joints into the structures based onβ-Sn matrix with intermetallic compounds(IMCs)distributed.By doping 0.07 wt.%mn,the Cu_(6)Sn_(5) growth along the SAC305/Cu interface during thermal aging can be inhibited to some extent.During isothermal aging at 170°C,the maximum shear force of solder joint decreases continuously with aging time increasing,while the fracture energy rises first and then decreases,reaching the maximum at 500 h compared by that with the microstructure homogenization.Cu_(3)Sn growth between Cu_(3)Sn_(5)/Cu interface has been retarded most at the aging time of 250 h with 0.07 wt.%mn-doped joints.With the aging time prolonging,the inhibition effect of mn on CusSn IMC layer becomes worse.The strengthening effect of mn can be explained by precipitation strengthening,and its mechanical behavior can be predicted by particle strengthening model proposed by Orowan.

关键词： SAC305 solder mn doping Shear mechanical behavior Isothermal aging Interfacial intermetallic compound

Tuning the electrochemical behaviors of N-doped Limn_(x)Fe_(1–x)PO_(4)/C via cation engineering with metal-organic framework-templated strategy

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Journal of Energy Chemistry 2023年第10期85卷 239-253,I0008页

作者： Yilin Li Zhaohui Xu Xinyu Zhang Zhenyu Wu Jian-En Zhou Jinjiang Zhang Xiaoming Lin Guangzhou Key Laboratory of Materials for Energy Conversion and Storage Key Laboratory of Theoretical Chemistry of EnvironmentMinistry of EducationSchool of ChemistrySouth China Normal UniversityGuangzhou 510006GuangdongChina National Engineering Research Center for Carbohydrate Synthesis Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of EducationJiangxi Normal UniversityNanchang 330022JiangxiChina Jiangmen Kanhoo Industry Co. LTDJiangmen 529040GuangdongChina

LiFePO_(4),as a prevailing cathode material for lithium-ion batteries(LIBs),still encounters issues such as intrinsic poor electronic conductivity,inferior Li-ion diffusion kinetic,and two-phase transformation mechanism involving substantial structural rearrangements,resulting in unsatisfactory rate performance.Carbon coating,cation doping,and morphological control have been widely employed to reconcile these issues.Inspired by these,we propose a synthetic route with metal–organic frameworks(MOFs)as self-sacrificial templates to simultaneously realize shape modulation,mn doping,and N-doped carbon coating for enhanced electrochemical performances.The as-synthesized Li mnxFe1–xPO4/C(x=0,0.25,and0.5)deliver tunable electrochemical behaviors induced by the MOF templates,among which Limn_(0.25)Fe_(0.75)PO_(4)/C outperforms its counterparts in cyclability(164.7 mA h g^(-1)after 200 cycles at 0.5 C)and rate capability(116.3 mA h g^(-1)at 10 C).Meanwhile,the ex-situ XRD reveals a dominant single-phase solid solution mechanism of Limn_(0.25)Fe_(0.75)PO_(4)/C during delithiation,contrary to the pristine LiFePO_(4),without major structural reconstruction,which helps to explain the superior rate performance.Furthermore,the density functional theory(DFT)calculations verify the effects of mn doping and embody the superiority of Limn_(0.25)Fe_(0.75)PO_(4)/C as a LIB cathode,which well supports the experimental observations.This work provides insightful guidance for the design of tunable MOF-derived mixed transitionmetal systems for advanced LIBs.

关键词： Limn_(x)Fe_(1–x)PO_(4)/C mn doping Metal-organic framework Cathode

通过微量锰掺杂直接合成体超导的Fe(Te,Se)单晶

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Science China Materials 2022年第9期65卷 2472-2478页

作者：谷亚东周孟虎张孟迪吴彦伟阮彬彬侯兴元张凡江培杰杨清松李更马明伟陈根富单磊任治安 Institute of Physics and Beijing National Laboratory for Condensed Matter Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China Beijing Academy of Quantum Information Sciences Beijing 100193China Information Materials and Intelligent Sensing Laboratory of Anhui Province Institutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Institutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China

无砷的铁硒基超导体Fe(Te,Se)在高场应用方面具有广阔的前景,但至今仍缺乏制备体超导块材的有效方法.本文通过微量的mn掺杂,一步法直接合成了无间隙铁的厘米尺寸高性能体超导单晶.通过电阻、磁化率与比热表征,发现mn掺杂浓度为1%时,样... 详细信息

无砷的铁硒基超导体Fe(Te,Se)在高场应用方面具有广阔的前景,但至今仍缺乏制备体超导块材的有效方法.本文通过微量的mn掺杂,一步法直接合成了无间隙铁的厘米尺寸高性能体超导单晶.通过电阻、磁化率与比热表征,发现mn掺杂浓度为1%时,样品具有最好的体超导电性,且上临界场和临界电流密度相比未掺杂时显著提高.最佳掺杂样品在2 K时自场下的临界电流密度高达4.5×10^(5)A cm^(-2),且在高场下衰减很小.利用扫描隧道显微镜观测,证实了微量锰掺杂有效消除了层间的间隙铁原子.本工作首次提供了一种大规模制备高性能Fe(Te,Se)超导块材的实用方法,为其未来高场应用奠定了基础.

关键词： iron chalcogenide Fe(Te,Se) critical current density mn doping

兼具异质结构和锰掺杂的Ni_(2)P纳米片阵列用于高效电催化水分解

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Science China Materials 2022年第7期65卷 1814-1824页

作者：罗远志王攀吴思思张改霞孙书会 Hariprasad Ranganathan 施志聪 Institute of Batteries School of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China The Key Laboratory of Fuel Cell Technology of Guangdong Province School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510641China énergie Matériaux Télécommunications Research Centre Institut National de la Recherche Scientifique(INRS)VarennesQuébecJ3X 1S2Canada

目前,开发低成本、稳定的电解水催化剂变得十分紧迫.本工作通过简单的水热反应,磷化及硫化处理,将三维Ni_(2)P纳米片阵列通过异质结工程和锰掺杂进行修饰.受益于锰掺杂,异质结构内部的协同作用以及三维纳米片阵列所暴露的丰富活性位点,M... 详细信息

目前,开发低成本、稳定的电解水催化剂变得十分紧迫.本工作通过简单的水热反应,磷化及硫化处理,将三维Ni_(2)P纳米片阵列通过异质结工程和锰掺杂进行修饰.受益于锰掺杂,异质结构内部的协同作用以及三维纳米片阵列所暴露的丰富活性位点,mn掺杂Ni_(2)O_(3)/Ni_(2)P和mn掺杂Ni_(x)S_(y)/Ni_(2)P分别表现出优异的析氢和析氧催化性能.其中,它们分别在104和290 mV的过电位下获得-10和100 mA cm^(-2)电流密度.此外,mn掺杂Ni_(x)S_(y)/Ni_(2)P在50 mA cm^(-2)的电流密度下能稳定运行160 h.以mn掺杂Ni_(2)O_(3)/Ni_(2)P和mn掺杂Ni_(x)S_(y)/Ni_(2)P分别作为阴极和阳极组成的全水分解电解池,不仅在1.65 V的电池电压下获得10 mA cm^(-2)的电流密度,而且在50 mA cm^(-2)的电流密度下仍能稳定运行120 h.本研究工作不仅提供了一种同时利用异质结工程、锰掺杂和三维纳米结构阵列的策略来设计和制备高活性的电解水催化剂,还提出了大规模制备应用于可再生能源器件的非贵金属电催化剂的新方向.

关键词： water splitting Ni_(2)P heterostructure mn doping three-dimensional nanosheet arrays