检索结果-南通市图书馆

Enhancing oxide scale growth and adhesion via electrochemically regulating ion diffusion

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第27期158卷 133-144页

作者： Peilin Wang kaifa du Huayi Yin Dihua Wang School of Resource and Environmental Sciences Hubei International Scientific and Technological Cooperation Base of Sustainable Resources and EnergyWuhan UniversityWuhan 430072China

Pre-oxidation is a common surface treatment approach to enhance the corrosion resistance of met-als,which suffers from slow ion diffusion kinetics,bad oxide scale adhesion,and weak compactness.Herein,we propose an electrochemical oxidation approach in molten carbonate to improve the oxide scale growth and adhesion via electrochemically regulating ion diffusion in the formed oxide scale.An anodic polarization applied at the metal substrate enlarges the chemical potential gradient of oxygen and offers a favorable electric field across the metal/oxide interface to the oxide scale/molten salt interface,thereby speeding up the oxide scale growth rate in terms of increasing the diffusion rate of metal cations and oxygen ions through the oxide scale.At the same time,the oxide scale adhesion is remarkedly im-proved because the metal vacancies at the oxide/alloy interface are filled by the newly formed oxide.After being treated by electrochemical oxidation,the corrosion rate of the Ni-16Fe-4Mo alloys in molten Li_(2) CO_(3)-Na_(2) CO_(3)-K_(2) CO_(3) decreased ten-fold.Overall,electrochemical oxidation enables the rapid formation of an adherent and corrosion-resistant oxide scale on the metal substrate,offering a general and effective way to fabricate corrosion-resistant films to survive in various aggressively corrosive media.

关键词： Molten salt High-temperature oxidation Anodic polarization Corrosion protection Inert anode

Efficient molten salt CO_(2)capture and selective electrochemical transformation processes toward carbon neutrality:advances,challenges,and prospects

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2023年第11期66卷 3116-3135页

作者： Bowen Deng Huayi Yin kaifa du Dihua Wang School of Resource and Environmental Sciences Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and EnergyWuhan UniversityWuhan 430072China

Atmospheric carbon dioxide(CO_(2))concentration has reached record levels due to excessive anthropogenic CO_(2)emissions from massive industrial productions.Renewable-energy-driven CO_(2)electroreduction is an effective method of directly converting CO_(2)into various value-added chemicals or materials without subsequent geological disposal treatment.Owing to their promising thermal stability,wide electrochemical window,tunable oxo-basicity,and nontoxic nature,molten salt electrolytes endow intrinsic advantages,such as fast CO_(2)absorption and selective electrochemical transformation,among different electrolyte species,wherein advanced carbon materials,CO,and hydrocarbons can be generated at relatively high current densities.Herein,we review the recent advances in molten salt CO_(2)capture and electrochemical transformation(MSCC-ET)technologies,including reaction mechanisms,CO_(2)absorption kinetics,electrode reaction kinetics,and product selectivity.This review highlights feasible strategies for regulating nanostructures,carbon product crystallinity,energy efficiency,overall CO_(2)conversion efficiency,and MSCC-ET adaptability toward practical flue gases.Moreover,suitable cost-effective inert anode candidates for the oxygen evolution reaction are discussed.

关键词： carbon dioxide electroreduction CO_(2)capture molten salt electrode reaction energy efficiency

Eliminating carbon contamination with improved one-step electrochemical preparation of refractory high-entropy alloy TiZrHfNbTa

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第32期163卷 132-139页

作者： Peng Li Jinhang Fan kaifa du Peilin Wang Ao Liu Huayi Yin Dihua Wang International Cooperation Base for Sustainable Utilization of Resources and Energy in Hubei Province Wuhan UniversityWuhan 430072China School of Resource and Environmental Science Wuhan UniversityWuhan 430072China

Creating refractory high-entropy alloys(RHEAs)effectively without impurities is a momentous challenge.Conventional methods for the preparation of RHEAs have exacting requirements for raw material purity and energy consumption.Molten salt electrolytic oxides are applied to the preparation of HEAs by virtue of their low cost and high efficiency.However,the use of graphite anodes in electrolysis will result in the carbon contamination of the products due to the deposition of CO_(3)^(2−)at the cathode.Increasing the reaction temperature accelerates the deoxidation of the oxide,thus reducing the amount of carbide but not eliminating it.Switching HfH_(2)instead of HfO_(2)and using Nb_(2)O_(5)to shield the precursor can effectively remove carbon contamination.However,this leads to a complicated preparation process and energy waste.Herein,we use the solid oxygen ion-conducting membrane(SOM)containing graphite and Sn(named as SOM@C/Sn)anode to separate the carbon from the molten salt and prevent the circulation of CO_(3)^(2−).The pure single-phase TiZrHfNbTa RHEA can be produced in only one-step with the SOM@C/Sn anode,which completely solves the problem of carbon contamination in the molten salt electrolysis preparation of HEAs.This work provides a feasible solution for the preparation of novel complex alloys such as carbon-free RHEAs in a low-cost short process.

关键词： High entropy alloy TiZrHfNbTa Molten salt Electrolysis Carbon contamination

Secure Fine-grained Multi-keyword Ciphertext Search Supporting Cloud-edge-end Collaboration in IoT

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2024年

作者： kaifa ZHENG Ziyu ZHOU Jianwei LIU Beiyuan YU School of Cyber Science and Technology Beihang University

The massive terminals access the Internet of things(IoT) through edge nodes, bringing forth new security and privacy challenges in ciphertext search and data sharing. Meanwhile, existing ciphertext search schemes often overlook lightweight computing paradigms and pay little attention to the search requirements of multiple data owners(DOs)/data users(dus). To address these issues, we propose a secure fine-grained multi-keyword ciphertext search scheme with cloud-edge-end collaboration computing(SFMS-CC). This SFMS-CC scheme focuses on the efficiency of end users and employs a cloud-edge-end collaborative computing paradigm, effectively offloading the incremental overhead from terminals and achieving low-cost constant overhead for the first time on the DO/du side. Furthermore, based on public-key cryptography, a ciphertext search framework supporting multi-keyword is presented systematically. Each user is assigned an exclusive search Tok to enhance the user experience. Additionally, by integrating attribute-based encryption(ABE), a multi-DOs/multi-dus model is constructed, seamlessly embedding entity private keys and public keys into encryption, search, decryption, and other steps, ensuring high privacy and security of this scheme. Security analysis demonstrates that the SFMS-CC scheme withstands choose plaintext attack(CPA), providing privacy-preserving for outsourced data and user information. Simulation results indicate that the SFMS-CC scheme is efficient and feasible in practice.

关键词：

Effect of doping aluminum and yttrium on high-temperature oxidation behavior of Ni-11Fe-10Cu alloy

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2016年第11期34卷 1139-1147页

作者：程新华范磊刘莉杜开发汪的华 School of Resource and Environmental Sciences Wuhan University Institute of Metal Research Chinese Academy of Sciences

Aiming to develop materials for construction of the set-up and electrode of high-temperature molten salt reactors, the effect of Al and Y on the high-temperature oxidation behavior of Ni-11Fe-10Cu at 750 and 950 °C in air were investigated. The oxidation kinetics of Ni-11Fe-10Cu alloy followed parabolic law at 750 °C without spallation and linear law at 950 °C with severe spallation, while that of Ni-11Fe-10Cu-6Al-3Y alloy followed parabolic law at 750 and 950 °C without spallation. The parabolic rate constant （kp） of Ni-11Fe-10Cu was smaller than that of Ni-11Fe-10Cu-6Al-3Y at 750 °C. The oxide scale formed on Ni-11Fe-10Cu at 750 °C was composed of a CuO outer layer, a NiFe2O4 middle layer and a NiO inner layer. The oxide scale formed on Ni-11Fe-10Cu-6Al-3Y at 750 °C was also composed of the similar triplex layers in addition to an internal oxidation zone containing Al, Ni and Cu oxide and the microstructure of the scale changed with increasing temperature. Although the doping Al and Y could improve the adherence of oxide scale, it could aggravate the extent of internal oxidation. Based on the combination of X-ray diffraction （XRD）, scanning electron mi-croscopy/energy dispersive spectroscopy （SEM/EDX） analysis, the microstructure and growth mechanism of the multi-layer oxide scale was studied and the effect of doping Al and Y on the oxidation behavior of Ni-11Fe-10Cu alloy was also discussed.

关键词： Ni-Fe-Cu alloy doping rare earths high-temperature oxidation behavior multi-layer oxide scale

在线全文

学校读者我要写书评

暂无评论

面向碳中和的高温熔盐电化学技术

科学通报 2023年第30期68卷 3998-4014页

作者：尹华意邓博文杜开发李威高帅波石昊汪的华武汉大学资源与环境科学学院湖北省资源与能源可持续利用技术示范型国际科技合作基地武汉430072

高温熔盐电化学反应具有反应动力学快、选择性好的优点,可用于能源存储与转换、金属材料的提取和纯化、二氧化碳的捕集和转化利用、退役金属材料的循环利用等领域,利用清洁电能驱动的高温熔盐电解技术可实现从源头、过程和末端全流程降... 详细信息

高温熔盐电化学反应具有反应动力学快、选择性好的优点,可用于能源存储与转换、金属材料的提取和纯化、二氧化碳的捕集和转化利用、退役金属材料的循环利用等领域,利用清洁电能驱动的高温熔盐电解技术可实现从源头、过程和末端全流程降碳减排.本文简要回顾了近20年来武汉大学在高温熔盐电化学方向的主要研究工作,包括熔盐电解固态化合物冶金(低碳提取)、熔盐捕集-电解转化CO_(2)(碳捕集与转化)、熔盐电化学制备功能材料(材料低碳制备)、熔盐电解回收能源金属材料(低碳绿色循环)和高温电解器关键材料(析氧阳极),形成了固态化合物还原反应动力学“三相界线”理论,丰富了高温惰性合金析氧阳极选材数据库,揭示了阳极氧化膜稳定服役机制,发明了熔盐电化学阳极氧化冶金新方法,提出了“熔盐电解质酸碱性-电极反应调控”新策略,并为新能源产业可持续发展所需的“前端原材料清洁提取”和“末端退役能源材料回收利用”提供新方法和新技术.以此为线索,评述了面向碳中和的高温熔盐电化学所面临的机遇与挑战,讨论了高温熔盐电解基础理论和应用技术的发展趋势,展望了清洁电能驱动的熔盐电解技术在实现碳达峰、碳中和目标中的潜在贡献.

关键词：碳中和熔盐电化学电解 CO_(2)转化可持续发展

铜锡合金阳极在熔融碳酸盐中氧化膜的形成及其防护性能

在线全文

学校读者我要写书评

暂无评论

中国腐蚀与防护学报 2017年第5期37卷 421-427页

作者：杜开发王彬甘复兴汪的华武汉大学资源与环境科学学院湖北省资源与能源可持续利用技术示范型国际科技合作基地武汉430072

通过动电位扫描阳极氧化成膜、恒电位预氧化成膜以及开路电位浸泡预氧化成膜3种途径分别得到了3种氧化膜各有差异的QSn7-0.2铜锡合金电极。采用光学显微分析与XRD测试,表征了各氧化膜的形貌和成分,并且利用阳极极化曲线研究了3种成膜电... 详细信息

通过动电位扫描阳极氧化成膜、恒电位预氧化成膜以及开路电位浸泡预氧化成膜3种途径分别得到了3种氧化膜各有差异的QSn7-0.2铜锡合金电极。采用光学显微分析与XRD测试,表征了各氧化膜的形貌和成分,并且利用阳极极化曲线研究了3种成膜电极在450℃Li-Na-K三元共晶熔融碳酸盐中作为惰性析氧阳极的可行性。结果表明,恒电位预氧化成膜以及开路电位浸泡预氧化成膜两种成膜方法均能够在QSn7-0.2铜锡合金阳极表面形成含SnO_2的氧化膜,该膜能够显著阻碍基体合金中Cu的阳极溶解腐蚀,并且对析氧反应具有确定的电催化性能。

关键词：铜锡合金熔融碳酸盐氧化膜钝化防护性能

在线全文

学校读者我要写书评

暂无评论

卡方检验误用辨析

中华烧伤与创面修复杂志 2024年第5期40卷 482-488页

作者：张平原王开发西南大学数学与统计学院重庆400715

计数资料在生物医学研究中十分常见,此类资料常常被整理为列联表的形式。对计数资料,常见的研究目的是检验2个因素之间是否独立,因此常用χ^(2)检验来进行统计分析,却容易忽略χ^(2)检验的适用条件和不同条件下对结果的校正。此外,对计... 详细信息

计数资料在生物医学研究中十分常见,此类资料常常被整理为列联表的形式。对计数资料,常见的研究目的是检验2个因素之间是否独立,因此常用χ^(2)检验来进行统计分析,却容易忽略χ^(2)检验的适用条件和不同条件下对结果的校正。此外,对计数资料,还有检验2个分类变量之间是否存在线性变化趋势、结果是否一致等研究目的,因此如何根据不同的研究目的选择合适的检验方法,也是实际应用时值得关注的问题。该文通过系列示例比较系统地总结归纳了各类计数资料的常用统计分析方法,并对常见的误用情况进行了辨析。

关键词：生物医学研究数据说明,统计计数资料列联表 χ^(2)检验

液态金属储能电池中常用液态金属腐蚀研究进展

在线全文

学校读者我要写书评

暂无评论

中国腐蚀与防护学报 2020年第2期40卷 81-86页

作者：刘威杜开发胡晓宏汪的华武汉大学资源与环境科学学院武汉430072 湖北省资源与能源可持续利用技术示范型国际科技合作基地武汉430072 武汉大学化学与分子科学学院武汉430072

简要综述了液态金属储能电池中常用负极材料Li、正极材料Bi和Sb对与其接触的金属材料的腐蚀研究进展。根据近年来原子能反应堆以及液态金属储能电池等领域的液态金属腐蚀的研究成果,总结了金属材料在液态Li、Bi以及Sb中的腐蚀现象、腐... 详细信息

简要综述了液态金属储能电池中常用负极材料Li、正极材料Bi和Sb对与其接触的金属材料的腐蚀研究进展。根据近年来原子能反应堆以及液态金属储能电池等领域的液态金属腐蚀的研究成果,总结了金属材料在液态Li、Bi以及Sb中的腐蚀现象、腐蚀机理以及腐蚀影响因素,并提出了液态金属腐蚀的防护建议。

关键词：液态金属电池液态电极腐蚀防护