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扬帆启航:电化学实验初步
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作者 韩联欢 何权烽 詹东平 《电化学》 CAS CSCD 北大核心 2021年第3期311-315,共5页
电化学是研究电能和化学能相互转化的规律的科学。电能和化学能之间的相互转换,是通过电极/电解质溶液表界面的结构变化和电荷转移反应来实现的。以电化学能源器件为例,前者为超级电容器,能量存储和释放主要通过界面双电层的表界面结构... 电化学是研究电能和化学能相互转化的规律的科学。电能和化学能之间的相互转换,是通过电极/电解质溶液表界面的结构变化和电荷转移反应来实现的。以电化学能源器件为例,前者为超级电容器,能量存储和释放主要通过界面双电层的表界面结构变化来实现;后者为化学电源,能量存储和释放主要通过电极活性物质的表界面化学反应来实现。所以,研究一个电化学体系时,主要关注两个问题,即表界面结构和表界面电荷转移反应。而表界面结构直接影响表界面电荷转移反应的性质,因此,从电化学实验的角度,表界面的构筑是至关重要的,包括电极的制备和表征、电极修饰材料的制备及组装、溶剂和支持电解质的选择和优化、电化学实验环境等等。本文旨在向广大电化学初学者讲述电化学实验的准备工作以及对实验现场数据的基本判断,帮助大家在实验中及时发现问题,及早采取措施,高效率地获取可信的实验数据。 展开更多
关键词 电化学实验 实验准备 电极处理 电极表征
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Surface-Enhanced Raman Spectroscopy:Principles,Methods,and Applications in Energy Systems 被引量:1
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作者 quan-feng he Yu-Jin Zhang +3 位作者 Zhi-Lan Yang Jin-Chao Dong Xiu-Mei Lin Jian-Feng Li 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2023年第3期355-369,共15页
Surface-enhanced Raman spectroscopy(SERS)has advanced significantly since its inception.Numerous experimental and theoretical efforts have been made to understand the SERS effect and demonstrate its potential.Due to i... Surface-enhanced Raman spectroscopy(SERS)has advanced significantly since its inception.Numerous experimental and theoretical efforts have been made to understand the SERS effect and demonstrate its potential.Due to its extremely high sensitivity and selectivity and ability to provide molecular fingerprint information,SERS has a wide range of applications in surface and interfacial chemistry,energy,materials,biomedicine,environmental analysis,etc.This review aims to provide readers with an understanding of the principles,methodologies,and applications of SERS.We briefly introduce the fundamental theory of the SERS enhancement mechanism and summarize the details of the preparation of SERS-active substrates.Recent applications of SERS in energy systems are then highlighted,including probing surface reactions and interfacial charge transfer of batteries and electrocatalysts.Finally,the challenges and prospects of SERS research are discussed. 展开更多
关键词 Surface-enhance Raman spectroscopy In situ characterization Li-ion batteries Water splitting Fuel cells
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Recent advances in Raman spectroelectrochemistry on single-crystal surfaces
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作者 quan-feng he Jia Yu +1 位作者 Jin-Chao Dong Jian-Feng Li 《Science China Chemistry》 SCIE EI CAS CSCD 2023年第12期3360-3371,共12页
Benefiting from a principally contaminant-free and well-defined surface,single-crystal electrodes offer new insights into interfacial processes and are important in electrochemistry.The early impetus for using single-... Benefiting from a principally contaminant-free and well-defined surface,single-crystal electrodes offer new insights into interfacial processes and are important in electrochemistry.The early impetus for using single-crystal electrodes in electrocatalysis was to investigate the surface structure at the atomic level for the reactions that are sensitive to the surface.These studies were usually performed in an ultra-high vacuum with atomic force microscopy(AFM),scanning tunneling microscope(STM),and X-ray methods to avoid the contamination.However,such characterizations are limited in their ability to identify chemical species definitively,a limitation that has similarly plagued the study of single-crystals.Recent advances in shellisolated nanoparticle-enhanced Raman spectroscopy(SHINERS)have enabled the detection of reaction intermediates on singlecrystal electrodes,in which shell-isolated nanoparticles on the single-crystal electrode can enhance the Raman signal from the surface,without changing the surface structure and electrochemical response.Thus,this work aims to review recent advances in Raman spectroelectrochemical studies on single-crystal electrode surfaces.The discussion focuses on how SHINERS technology has enabled the effective detection of intermediate species and,when combined with the electrochemical method,has yielded novel insights into the dynamic evolution of surface structure and electrocatalytic reaction mechanisms.Finally,the challenges and future of single-crystal electrodes are introduced. 展开更多
关键词 single-crystal electrode shell-isolated nanoparticle-enhanced Raman spectroscopy interfacial structures adsorption
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High-entropy intermetallics:from alloy design to structural and functional properties 被引量:5
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作者 Hang Wang quan-feng he Yong Yang 《Rare Metals》 SCIE EI CAS CSCD 2022年第6期1989-2001,共13页
Conventional intermetallics are strong but brit-tle.However,multi-principal element intermetallics,also termed as high-entropy intermetallics(HEIs)in the recent high-entropy alloy literature,are strong but malleable,s... Conventional intermetallics are strong but brit-tle.However,multi-principal element intermetallics,also termed as high-entropy intermetallics(HEIs)in the recent high-entropy alloy literature,are strong but malleable,some of which even show appreciable ductility and fracture toughness at room temperature.In this article,we provide a focused review on the recent researches on HEIs,from the fundamentals,such as the concept of HEIs,the formation rules to the structural and functional properties of HEIs.The results hitherto reported clearly show that the HEIs with distinct properties could be a promising material for future structural and functional applications. 展开更多
关键词 Internetallics High-entropy alloys Phase formation Mechanical properties Functional properies
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Exceptionally shear-stable and ultra-strong Ir-Ni-Ta high-temperature metallic glasses at micro/nano scales
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作者 Yu-Tian Wang quan-feng he +5 位作者 Zi-Jian Wang Ming-Xing Li Yan-Hui Liu Yong Yang Bao-An Sun Wei-Hua Wang 《Science China Materials》 SCIE EI CAS CSCD 2022年第2期501-507,共7页
Ir-Ni-Ta metallic glasses(MGs)exhibit an array of superior high-temperature properties,making them attractive for applications at high temperatures or in harsh environments.However,Ir-Ni-Ta bulk MGs are quite brittle ... Ir-Ni-Ta metallic glasses(MGs)exhibit an array of superior high-temperature properties,making them attractive for applications at high temperatures or in harsh environments.However,Ir-Ni-Ta bulk MGs are quite brittle and often fracture catastrophically even before plastic yielding,significantly undercutting their high-strength advantage.Here,we show that the Ir-Ni-Ta MGs are not intrinsically brittle,but rather malleable when the feature size is reduced to micro/nano-scales.All tested Ir-Ni-Ta MG micropillars with a diameter ranging from~500 nm to~5μm display a large plastic strain above 25%(the maximum up to 35%),together with a yield strength up to 7 GPa,well exceeding the strength recorded in most metallic materials.The intrinsic shear stability of Ir-Ni-Ta MGs,as characterized by the normalized shear displacement during a shear event,is much larger than those malleable Zr-and Cu-based MGs.Our results suggest that Ir-Ni-Ta MGs are excellent candidates for micro/nanoscale structural applications used at high-temperature or extreme conditions. 展开更多
关键词 micro-compressions micropillars intrinsic shear stability metallic glasses
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