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Nano Research 2024年第4期17卷 2555-2562页

作者： guangyuan yan Tianlu Wang Biwei Zhao Wenjing Gao Tong Wu Liming Ou School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China

Medium-entropy oxides(MEOs)with broad compositional tunability and entropy-driven structural stability,are receiving booming attention as a promising candidate for oxygen evolution reaction(OER)***,ultrathin two-dimensional(2D)nanostructure offers extremely large specific surface area and is therefore considered to be an ideal catalyst ***,it remains a grant challenge to synthesize ultrathin 2D MEOs due to distinct nucleation and growth kinetics of constituent multimetallic elements in 2D anisotropic *** this work,an ultrathin 2D MEO(MnFeCoNi)O was successfully synthesized by a facile and low-temperature ionic layer epitaxy *** from multi-metal synergistic effects within ultrathin 2D nanostructure,this 2D MEO(MnFeCoNi)O revealed excellent OER electrocatalytic performance with a quite low overpotential of 117 mV at 10 mA·cm^(-2) and an impressive stability for 120 h continuous operation with only 6.9%***,the extremely high mass activity(5584.3 A·g^(-1))was three orders of magnitude higher than benchmark RuO_(2)(3.4 A·g^(-1))at the same overpotential of 117 *** work opens up a new avenue for developing highly efficient and stable electrocatalysts by creating 2D nanostructured MEOs.

关键词： medium-entropy oxide two-dimensional nanomaterials ionic layer epitaxy oxygen evolution reaction electrocatalysis

Wet spinning of fiber-shaped flexible Zn-ion batteries toward wearable energy storage

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Journal of Energy Chemistry 2022年第8期31卷 192-200,I0006页

作者： Tingting Gao guangyuan yan Xin yang Qing yan yankuan Tian Jianwei Song Faxue Li Xueli Wang Jianyong Yu Yiju Li Shaojun Guo Key Laboratory of Textile Science and Technology Ministry of EducationCollege of TextilesDonghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China School of Materials Science and Engineering Peking UniversityBeijing 100871China State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace EngineeringXi’an Jiaotong UniversityXi’an 710049ShaanxiChina School of Biological and Chemical Engineering NingboTech UniversityNingbo 315100ZhejiangChina

High-performance flexible one-dimensional(1D)electrochemical energy storage devices are crucial for the applications of wearable *** much progress on various 1D energy storage devices has been made,challenges involving fabrication cost,scalability,and efficiency ***,a highperformance flexible all-fiber zinc-ion battery(ZIB)is fabricated using a low-cost,scalable,and efficient continuous wet-spinning *** composite inks containing cellulose nanofibers/carbon nanotubes(CNFs/CNTs)binary composite network and either manganese dioxide nanowires(MnO_(2) NWs)or commercial Zn powders are utilized to spinning fiber cathodes and anodes,***_(2) NWs and Zn powders are uniformly dispersed in the interpenetrated CNFs/CNTs fibrous network,leading to homogenous composite inks with an ideal shear-thinning *** obtained fiber electrodes demonstrate favorable uniformity and *** from the well-designed electrodes,the assembled flexible fiber-shaped ZIB delivers a high specific capacity of 281.5 m Ah g^(-1) at 0.25 A g^(-1) and displays excellent cycling stability over 400 ***,the wet-spun fiber-shaped ZIBs achieve ultrahigh gravimetric and volumetric energy densities of 47.3 Wh kg^(-1) and 131.3 m Wh cm^(-3),respectively,based on both cathode and anode and maintain favorable stability even after 4000 bending *** work offers a new concept design of 1D flexible ZIBs that can be potentially incorporated into commercial textiles for wearable and portable electronics.

关键词： Manufacturing Wet spinning Zn ion battery Nanocellulose Fiber

Nanoparticle-Decorated Ultrathin La2O3 Nanosheets as an Effcient Electrocatalysis for Oxygen Evolution Reactions

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Nano-Micro Letters 2020年第4期12卷 41-52页

作者： guangyuan yan Yizhan Wang Ziyi Zhang Yutao Dong Jingyu Wang Corey Carlos Pu Zhang Zhiqiang Cao yanchao Mao Xudong Wang Department of Material Sciences and Engineering University of Wisconsin-MadisonMadisonWI 53706USA Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024People’s Republic of China MOE Key Laboratory of Materials Physics School of PhysicsZhengzhou UniversityZhengzhou 450001People’s Republic of China

Electrochemical catalysts for oxygen evolution reaction are a critical component for many renewable energy applications. To improve their catalytic kinetics and mass activity are essential for sustainable industrial applications. Here, we report a rare-earth metal-based oxide electrocatalyst comprised of ultrathin amorphous La2O3 nanosheets hybridized with uniform La2O3 nanoparticles(La2O3@NP-NS). Significantly improved OER performance is observed from the nanosheets with a nanometer-scale thickness. The as-synthesized 2.27-nm La2O3@NP-NS exhibits excellent catalytic kinetics with an overpotential of 310 mV at 10 m A cm^-2, a small Tafel slope of 43.1 mV dec^-1, and electrochemical impedance of 38 Ω. More importantly, due to the ultrasmall thickness, its mass activity, and turnover frequency reach as high as 6666.7 A g^-1 and 5.79 s^-1, respectively, at an overpotential of 310 mV. Such a high mass activity is more than three orders of magnitude higher than benchmark OER electrocatalysts, such as IrO2 and RuO2. This work presents a sustainable approach toward the development of highly e cient electrocatalysts with largely reduced mass loading of precious elements.

关键词： Oxygen evolution reaction Multiphase hybrid Two-dimensional nanomaterials Rare-earth oxides Ionic layer epitaxy

Excess PbI_(2)evolution for triple-cation based perovskite solar cells with 21.9%efficiency

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Journal of Energy Chemistry 2022年第3期31卷 152-160,I0005页

作者： Zhu Ma Dejun Huang Qianyu Liu guangyuan yan Zheng Xiao Dong Chen Jiaxuan Zhao yan Xiang Changtao Peng Haijin Li Meng Zhang Wenfeng Zhang Lianfeng Duan Yuelong Huang Institute of Photovoltaic Southwest Petroleum UniversityChengdu 610500SichuanChina Department of Chemistry Shantou UniversityShantou 515063GuangdongChina

The triple cation mixed perovskites(Cs FAMA)are known as one of the most efficient candidates for perovskite solar cells(PSCs).It is found that the power conversion efficiency(PCE)of triple-cation based devices would increase with the test time extending,and the maximum efficiency is normally obtained after several days aging ***,the relationship between enhanced device performance,excess PbI_(2)and its evolution in triple cation perovskite films of initial days was systematically *** Cs FAMA-PSCs are prepared by two-step methods under two environmental conditions,including in the glove box and the ambient air(30%humidity).After 7 days testing,the maximum PCE of PSCs under two conditions dramatically increased 12.4%and 12.2%,reached 21.68%and 21.89%,*** initial days,the XRD peak intensities of perovskite phase gradually decreased and those corresponding to PbI_(2)*** with time-resolved photoluminescence(TRPL)and kelvin probe force microscopy(KPFM),it was found that the defects were passivated with the evolution of PbI_(2).This work reveals the excess PbI_(2)and its evolution in perovskite film,which can further supplement the understanding of PbI_(2)defect passivation.

关键词： Evolution of PbI_(2) Defect passivation Two-step method Triple cation Perovskite solar cells

Recent progress in hydrogen:From solar to solar cell

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Journal of Materials Science & Technology 2024年第9期176卷 236-257页

作者： yanlin Li Zhu Ma Shanyue Hou Qianyu Liu guangyuan yan Xiaoshan Li Tangjie Yu Zhuowei Du Junbo yang Yi Chen Wei You Qiang yang yan Xiang Shufang Tang Xuelin Yue Meng Zhang Wenfeng Zhang Jian Yu Yuelong Huang Jiale Xie Chun Tang Yaohua Mai Kuan Sun School of New Energy and Materials Southwest Petroleum University(SWPU)Chengdu 610500China Institute of New Energy Technology College of Information Science and TechnologyJinan UniversityGuangzhou 510632China Key Laboratory of Low-grade Energy Utilization Technologies and Systems(MoE) School of Energy and Power EngineeringChongqing UniversityChongqing 400044China

Hydrogen,meeting the requirements of sustainable development,is regarded as the ultimate energy in the 21st *** to the inexhaustible and feasible of solar energy,solar water splitting is an immensely promising strategy for environmental-friendly hydrogen production,which not only overcomes the fluctuation and intermittency but also contributes to achieving the mission of global“Carbon Neutrality and Carbon Peaking”.However,there is still a lack of a comprehensive overview focusing on hydrogen progress with a discussion of development from solar energy to solar ***,we emphasize several solar-to-hydrogen pathways from the basic concepts and principles and focus on photovoltaic-electrolysis and photoelectrochemical/photovoltaic systems,which have achieved solar-to-hydrogen(STH)efficiency of over 10%and have extremely promising for large-scale *** addition,we summarize the challenges and opportunities faced in this field including configuration design,electrode materials,and performance ***,perspectives on the potential commercial application and scientific research for the further development of solar-to-hydrogen are analyzed and presented.

关键词： Hydrogen Photovoltaics Catalysis STH efficiency Integrated module

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稀土Er对A356合金组织与性能的影响

特种铸造及有色合金 2018年第3期38卷 312-315页

作者：李俊颀毛丰闫光远曹志强大连理工大学辽宁省凝固控制与数字化制备技术重点实验室

利用金相显微镜、扫描电镜和拉伸试验机研究了Er元素对A356合金组织与性能的影响,并分析了其变质机制。结果表明,Er元素可以改善与共晶Si的形貌,得到短杆状共晶Si。当Er含量为0.3%时合金的力学性能最好。经T6热处理后,合金抗拉强度提高... 详细信息

利用金相显微镜、扫描电镜和拉伸试验机研究了Er元素对A356合金组织与性能的影响,并分析了其变质机制。结果表明,Er元素可以改善与共晶Si的形貌,得到短杆状共晶Si。当Er含量为0.3%时合金的力学性能最好。经T6热处理后,合金抗拉强度提高了31.2%,伸长率提高了233%。

关键词： Er A356合金微观组织力学性能

近红外光谱在线检测技术在精馏实验教学中的应用

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实验技术与管理 2021年第12期38卷 29-32页

作者：李敏温国基闫光远叶向群浙江大学化学工程与生物工程学院浙江杭州310027 浙江大学控制科学与工程学院浙江杭州310027

为解决乙醇精馏实验教学过程中产物的浓度不能连续分析的问题,将近红外光谱在线分析方法应用于精馏实验的数据采集过程中。采用相关系数法筛选特征波长,分别建立进料、塔顶物料和塔釜物料近红外光谱的线性预测模型,根据最小二乘法拟合... 详细信息

为解决乙醇精馏实验教学过程中产物的浓度不能连续分析的问题,将近红外光谱在线分析方法应用于精馏实验的数据采集过程中。采用相关系数法筛选特征波长,分别建立进料、塔顶物料和塔釜物料近红外光谱的线性预测模型,根据最小二乘法拟合得到模型的决定系数R2分别为0.9661、0.9937、0.9433。通过不同回流比下的精馏实验比较了近红外光谱在线分析的浓度值与密度计法测量的浓度值,两者的平均相对误差为3.4%。结果表明:该方法可以代替传统的理化分析方法,有利于学生观察精馏的稳态情况,在实验教学中取得了良好的效果。

关键词：近红外光谱乙醇浓度实验教学精馏

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挤压铸造高品质大型结构件

特种铸造及有色合金 2021年第2期41卷 133-138页

作者：邢书明闫光远鲍培玮潘琦俊胡柏丽王超北京交通大学机械与电子控制工程学院北京100044 芜湖禾田汽车工业有限公司

大型结构件的高品质整体成形是零件制造领域的难题。挤压铸造以整体流变补缩解决了重力铸造补缩效率低和收缩缺陷的问题,又以良好的流变充型能力突破了固态锻造技术设备能力的限制,成为大型结构件高品质整体成形制造的新选择。实践证明... 详细信息

大型结构件的高品质整体成形是零件制造领域的难题。挤压铸造以整体流变补缩解决了重力铸造补缩效率低和收缩缺陷的问题,又以良好的流变充型能力突破了固态锻造技术设备能力的限制,成为大型结构件高品质整体成形制造的新选择。实践证明,使用专用涂料、铸造模具代替锻造模块并对模具温度进行有效调控是降低模具成本占比的有效途径。局部多点加压、复合挤压以及随流半固态挤压铸造都是显著降低设备投资、确保高品质成形的有效措施。

关键词：大型结构件液态模锻挤压铸造模具

7050/3003铝合金复层铸坯的制备与热处理工艺研究

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武汉科技大学学报 2018年第4期41卷 241-246页

作者：曹志强周弈闫光远高秉阳大连理工大学辽宁省凝固控制与数字化制备技术重点实验室辽宁大连116024

采用直接冷却铸造法制备7050/3003铝合金复合铸坯,随后对其进行均匀化退火处理。使用扫描电镜、电子探针、维氏硬度仪等对铸坯界面进行组织性能分析,探究熔体浇铸温度及热处理工艺参数对界面结合质量的影响。结果表明,3003铝合金浇铸温... 详细信息

采用直接冷却铸造法制备7050/3003铝合金复合铸坯,随后对其进行均匀化退火处理。使用扫描电镜、电子探针、维氏硬度仪等对铸坯界面进行组织性能分析,探究熔体浇铸温度及热处理工艺参数对界面结合质量的影响。结果表明,3003铝合金浇铸温度为720℃、7050铝合金浇铸温度为680℃时,铸坯界面清晰、无混流和明显铸造缺陷,且硬度相对较高,两种铝合金之间形成一层初生α-Al过渡层,实现了良好的冶金结合。均匀化退火后,7005合金一侧非平衡共晶组织和枝晶偏析基本消除,晶界处粗大第二相溶解,且随着退火温度的升高和保温时间的延长,复层材料界面成分分布逐渐均匀,扩散层厚度有所增加。

关键词：铝合金复层铸坯界面性能组织形貌直接冷却铸造均匀化退火

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比压对液态模锻铍青铜件组织和性能的影响

精密成形工程 2024年第4期16卷 165-171页

作者：邢书明高文静鲍培玮闫光远韩亮杨景华高颖北京交通大学机械与电子控制工程学院北京100044 河北省安全工具产业技术研究院河北沧州062150 河北中泊防爆工具集团有限公司河北沧州062150

目的针对先铸坯再模锻方法工艺流程长、能耗高、成本高的缺点,将液态模锻工艺应用于铍青铜件的成形制造中,以提高零件的成形质量、降低成本和能耗。方法在工业生产条件下,对比研究了主要工艺参数比压对液态模锻铍青铜件试样拉伸性能、... 详细信息

目的针对先铸坯再模锻方法工艺流程长、能耗高、成本高的缺点,将液态模锻工艺应用于铍青铜件的成形制造中,以提高零件的成形质量、降低成本和能耗。方法在工业生产条件下,对比研究了主要工艺参数比压对液态模锻铍青铜件试样拉伸性能、冲击性能、硬度及晶粒特征的影响规律。结果当液锻比压从40 MPa提高至80 MPa时,液锻铍青铜的晶粒尺寸可以细化至65μm以下,抗拉强度提高了150 MPa,伸长率由20%提高至40%,硬度和冲击韧性分别提高了35HBW和20 J/cm^(2)。结论液锻比压是影响铍青铜液锻件组织和性能的关键因素,随着液锻比压的增大,液锻铍青铜件晶粒被显著细化,强度、塑性、硬度和冲击韧性均得到显著提高。

关键词：铍青铜液态模锻比压显微组织力学性能

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