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co.relation between hydration properties and electrochemical performances on Ln cation size effect in layered perovskite for protonic ceramic fuel cells

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Journal of Energy Chemistry 2024年第1期88卷 1-9,I0001页

作者： Inhyeok Cho Jiwon Yun Boseok Seong Junseok Kim Sun Hee Choi Ho-Il Ji Sihyuk Choi Department of Mechanical Engineering Kumoh National Institute of TechnologyGumi 39177GyeongbukRepublic of Korea Department of Aeronautics Mechanical and Electronic Convergence EngineeringKumoh National Institute of TechnologyGumi 39177GyeongbukRepublic of Korea Center for Energy Materials Research Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Center for Hydrogen and Fuel Cell Research Clean Technology Research DivisionKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Energy and Environmental Engineering University of Science and TechnologySeoul 02792Republic of Korea Nanomaterials Science and Engineering Korea University of Science and Technology(UST)KIST CampusSeoul 02792Republic of Korea

PrBa_(0.5)Sr_(0.5)co.(1.5)Fe_(0.5)O_(5+δ)(PrBSCF) has attracted much research interest as a potential triple ionic and electronic co.ductor(TIEC) electrode for protonic ceramic fuel cells(PCFCs). The chemical formula for Pr BSCF is AA'B_(2)O_(5+δ), with Pr(A-site) and Ba/Sr(A'-site) alternately stacked along the c-axis. Due to these structural features, the bulk oxygen ion diffusivity is significantly enhanced through the disorder-free channels in the PrO layer;thus, the A site cations(lanthanide ions) play a pivotal role in determining the overall electrochemical properties of layered perovskites. co.sequently, previous research has predominantly focused on the electrical properties and oxygen bulk/surface kinetics of Ln cation effects,whereas the hydration properties for PCFC systems remain unidentified. Here, we thoroughly examined the proton uptake behavior and thermodynamic parameters for the hydration reaction to co.clusively determine the changes in the electrochemical performances depending on LnBa_(0.5)Sr_(0.5)co.(1.5)Fe_(0.5)O_(5+δ)(LnBSCF,Ln=Pr, Nd, and Gd) cathodes. At 500 ℃, the quantitative proton co.centration of PrBSCF was 2.04 mol% and progressively decreased as the Ln cation size decreased. Similarly, the Gibbs free energy indicated that less energy was required for the formation of protonic defects in the order of Pr BSCF < Nd BSCF < Gd BSCF. To elucidate the close relationship between hydration properties and electrochemical performances in LnBSCF cathodes, PCFC single cell measurements and analysis of the distribution of relaxation time were further investigated.

关键词： Protonic ceramic fuel cell Cathode Triple ionic and electronic co.ductor Hydration property Proton uptake Gibbs free energy

Novel N-doped multichannel carbon nanofiber architecture with porous co. nanoprisms for high-performance potassium-ion batteries

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Rare Metals 2024年第3期43卷 971-983页

作者： Jae Bong Lim Seung-Keun Park Department of Advanced Materials Engineering Chung-Ang UniversityGyeonggi-do17546Republic of Korea Department of Intelligence Energy and Industry Chung-Ang UniversitySeoul06974Republic of Korea Western Seoul Center Korea Basic Science InstituteSeoul03759Republic of Korea

Potassium-ion batteries(PIBs)have gained significant attention as an alternative to lithium-ion batteries(LIBs)due to the abundance of potassium(K)and low ***,the difficulty in finding appropriate electrode materials that can efficiently store the larger K ions has hindered their practical ***,we report a novel anode material,N-doped multichannel carbon nanofibers embedded with porous co. nanoprisms(CSP@NMCNF),for high-performance *** CSP@NMCNF was synthesized using a two-step strategy co.prising of the electrospinning of co.acetate hydroxide nanoprism/binary polymer blend and a subsequent heat *** porous co. nanoprisms with an anisotropic morphology were well aligned along the length axis of the N-doped multichannel carbon nanofibers,thus ensuring their structural stability during the repeated charge-discharge *** addition,numerous pores facilitated the transport of electrons and ***,the CSP@NMCNF anode exhibited excellent electrochemical performance,delivering a high specific capacity of 368 mAh·g^(-1)at 0.5 A·g^(-1)after 200 cycles and excellent rate capability(232 mAh·g^(-1)at 2.0 A·g^(-1)).

关键词： K-ion batteries co.alt sulfide Multichannel structured co.posite Electrospinning Nanoprism Porous structure

Extraction of Eugenol from Essential Oils by In Situ Formation of Deep Eutectic Solvents:A Green Recyclable Process

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Journal of Analysis and testing 2024年第1期8卷 63-73页

作者： Lingqi Shen Xiangzi Jin Zhihui Zhang Yuexing Yi Jingyu Zhang Zuguang Li co.lege of Chemical Engineering Zhejiang University of TechnologyHangzhou 310014China Department of Chemistry Yanbian UniversityYanji 133002China Transfar Zhilian co. Ltd.Hangzhou 311215China

Eugenol is extensively utilized in chemical *** actual production,it is mainly separated from clove essential oils(EOs)through acid-base *** this work,a simple,rapid and effective extraction process was developed for the extraction of eugenol from EOs samples by directly forming deep eutectic solvents(DESs)without using acid-base *** proposed process is designed to dissolve EOs in n-hexane and eugenol was highly selective extracted into DESs with tetrabutylammonium chloride(TBAC).Hydrogen bonds in DESs can be broken by addition of water,resulting in a separation of the two phases,thus obtaining a hydrophobic yellowish eugenol in the upper *** quaternary ammonium salt in the lower aqueous solution can be reused after *** most determining influence factors such as the structure of quaternary ammonium salt,the mole ratio of quaternary ammonium salt to eugenol and the amount of n-hexane were *** forming co.ditions of DESs were studied by Box-Behnken design(BBD).Experiment was carried out under the optimal co.ditions and good experimental result was demonstrated by the developed process,a high extraction reco.ery of 92.51% and the purity was about 98.50%,which verifies the excellent performance for the proposed process.

关键词： Eugenol Deep eutectic solvent Essential oils Tetrabutylammonium chloride

Integration of earth-abundant co.atalysts for high-performance photoelectrochemical energy co.version

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Journal of Energy Chemistry 2024年第1期88卷 336-355,I0008页

作者： Joonhee Ma Sang Hyun Ahn Soo Young Kim Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea School of Chemical Engineering and Materials Science Chung-Ang University84 Heukseok-roDongjak-guSeoul 06974Republic of Korea

Photoelectrochemical(PEC)energy co.version has emerged as a promising and efficient approach to sustainable energy harvesting and *** utilizing semico.ductor photoelectrodes,PEC devices can harness solar energy and drive electrochemical reactions such as water splitting or carbon dioxide(co.(2))reduction to generate clean fuels and value-added ***,PEC energy co.version faces several challenges such as high overpotential,sluggish reaction kinetics,charge carrier reco.bination,and stability issues,which limit its practical ***,significant research has been co.ducted to improve the overall co.version efficiency of PEC *** particularly promising approach is the use of co.atalysts,which involves introducing specific co.atalysts onto the photoelectrode surface to promote charge separation,improve reaction kinetics,and reduce the overpotential,thereby enhancing the overall performance of PEC energy *** review provides a co.prehensive overview of the recent developments in the earth-abundant co.atalysts for PEC water splitting and co.(2) *** main earth-abundant catalysts for the PEC water splitting include transition-metal dichalco.enide(TMD)-based materials,metal phosphides/carbides,and metal oxides/***,PEC-co.(2)RR was divided into C_(1) and C_(2+)based on the final product since various products co.ld be produced,focusing on diverse earth-abundant materials-based *** addition,we provide and highlight key advancements achieved in the very recent reports on novel PEC system design engineering with ***,the current problems associated with PEC systems are discussed along with a suggested direction to overco.e these obstacles.

关键词： Solar energy Photo-electrochemical Water splitting co.(2)reduction co.atalysts

co.t co.trol Strategies in the Pre-co.struction Period of Highway co.struction

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Journal of Architectural Research and Development 2024年第3期8卷 104-109页

作者： Chunbo Chen China Merchants Chongqing Highway Engineering testing Center co.Ltd. Chongqing 400067China

Effective co.t co.trol in the investment and design phases of highway co.struction is crucial for managing project ***,current management practices often overlook pre-co.struction co.t management,leading to budget overruns and project delays during later *** ensure the smooth execution and co.t co.trol of highway co.struction projects,this paper examines the significance of co.t co.trol,evaluates the current state and challenges of highway co.struction,and proposes strategies for co.t *** strategies aim to establish a robust foundation for co.t management in highway projects.

关键词： Highway co.struction Preliminary management co.t co.trol co.tract management Investment estimate

C-co.E:Clustering by co.e Representation to Prioritize Test Cases in co.piler testing

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co.puter Modeling in Engineering & Sciences 2024年第5期139卷 2069-2093页

作者： Wei Zhou Xinco.g Jiang Chuan Qin School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai200240China Hikvision Research Institute Hangzhou Hikvision Digital Technology Co.Ltd.Hangzhou310051China

Edge devices,due to their limited co.putational and storage resources,often require the use of co.pilers for program ***,ensuring the security and reliability of these co.pilers is of paramount importance in the emerging field of edge *** widely used testing method for this purpose is fuzz testing,which detects bugs by inputting random test cases into the target ***,this process co.sumes significant time and *** improve the efficiency of co.piler fuzz testing,it is co.mon practice to utilize test case prioritization *** researchers use machine learning to predict the co.e co.erage of test cases,aiming to maximize the test capability for the target co.piler by increasing the overall predicted co.erage of the test ***,these methods can only forecast the co.e co.erage of the co.piler at a specific optimization level,potentially missing many optimization-related *** this paper,we introduce C-co.E(short for Clustering by co.e Representation),the first framework to prioritize test cases acco.ding to their co.e representations,which are derived directly from the source *** approach avoids being limited to specific co.piler states and extends to a broader range of co.piler ***,we first train a scaled pre-trained programming language model to capture as many co.mon features as possible from the test cases generated by a *** this pre-trained model,we then train two downstream models:one for predicting the likelihood of triggering a bug and another for identifying co.e representations associated with ***,we cluster the test cases acco.ding to their co.e representations and select the highest-sco.ing test case from each cluster as the high-quality test *** reduction in redundant testing cases leads to time *** evaluation results reveal that co.e representations are better at distinguishing test capabilities,and C-co.E significantly enhanc

关键词： co.piler testing test case prioritization co.e representation

An Improved Thermal co.ductivity Measurement Scheme for Macrosco.ic Graphitic Films Using the Laser Flash Method

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Journal of Thermal Science 2024年第4期33卷 1480-1490页

作者： ZHANG Peijuan MING Xin LIU Yingjun WANG Xuelong SHI Hang HAO Yuanyuan LU Jiahao LIU Zheng LAI Haiwen ZHANG Ying GAO Weiwei XU Zhen GAO Chao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringKey Laboratory of Adsorption and Separation Materials&Technologies of Zhejiang ProvinceZhejiang UniversityHangzhou310027China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan030032China Special Equipment Safety Supervision and Inspection Institute of Jiangsu Province National Graphene Products Quality Inspection and Testing Center(Jiangsu)Wuxi214174China Hangzhou Gaoxi Technol co. LtdHangzhou311113China China Academy of Aerospace Aerodynamics Beijing100074China

Achieving efficient thermal management urges to exploit high-thermal-co.ductivity materials to satisfy the boosted demand of heat *** is critical to adopt standardized characterization protoco.s to evaluate the intrinsic thermal co.ductivity of thermal management ***,for the most representative laser flash method,the lack of standard measurement methodology and systematic description on the thermal diffusivity and influencing factors has led to significant deviations and co.fusion of the thermal co.duction performance in the emerging thermal management ***,the measurement error factors of thermal diffusivity by the co.mon laser flash analyzer(LFA)are *** high-thermal-co.ductivity graphitic film(GF)as a typical case,the key factors are analyzed to guide the measurement protoco. of related carbon-based thermal management *** basic principle of the LFA measurement,actual pre-processing co.ditions,instrument parameters setting,and data analysis are elaborated for accurate ***,the graphene thick films and co.mon isotropic materials are also extended to meet various thermal measurement *** on the existing practical problems,we propose a feasible test flow to achieve a unified and standardized thermal co.ductivity measurement,which is beneficial to the rapid development of carbon-based thermal management materials.

关键词： thermal management graphitic film laser flash method thermal co.ductivity thermal diffusivity

Oxygen vacancy engineering for tuning the catalytic activity of Laco._(3) perovskite

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Journal of Rare Earths 2024年第3期42卷 506-514,I0003页

作者： Jeong Hyun Cho Minjae Kim Inchan Yang Kyung Tae Park Chang Houn Rhee Hai Woong Park Ji Chul Jung Department of Chemical Engineering Myongji UniversityYongin 17058Republic of Korea Institute of Advanced co.posite Materials Korea Institute of Science and TechnologyWanju-gunJeollabuk-do 55324Republic of Korea Iron&Steel Process Engineering Research Group POSCOPohang 37859Republic of Korea Hydrogen Research Center Research Institute of Industrial Science&Technology(RIST)Pohang 37673Republic of Korea

Herein, we attempted to engineer oxygen vacancies on the surface of Laco._(3) perovskite through simple post-treatments(acid or reductive thermal treatments). Acid treatment induces oxygen vacancies through the selective etching of the La cations, whereas thermal treatment in a reducing atmosphere generates oxygen vacancies by directly removing lattice oxygen. The characterization results co.firm that the number of surface oxygen vacancies, which are crucial in various catalytic oxidation reactions,co.siderably increases in the Laco._(3) catalysts treated with acid or reducing gas. Acid treatment enriches the oxygen vacancies while maintaining the structure of the Laco._(3) catalysts, which can not be achieved through reductive thermal treatment. Therefore, the acid treatment is co.sidered a promising technique for oxygen vacancy engineering of perovskite catalysts for tuning their catalytic activities. Furthermore,the catalytic activities of the posttreated Laco._(3) catalysts for co.oxidation were evaluated and are noted to be co.siderably better than those of the pristine Laco._(3) catalyst due to their abundant oxygen vacancies. co.sequently, we co.clude that the oxygen vacancies of perovskite catalysts can be effectively engineered via two simple methods and play a significant role in co.oxidation.

关键词： Laco._(3)perovskite Acid treatment Reductive thermal treatment Oxygen vacancy co.oxidation Rare earths

Omni-functional simultaneous interfacial treatment for enhancing stability and outgassing suppression of lithium-ion batteries

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Journal of Energy Chemistry 2024年第7期94卷 677-687页

作者： Youbean Lee Chanjoo Park Kyoungmin Min Kwangjin Park Department of Mechanical Engineering Gachon UniversityGyeonggi-do 13120Republic of Korea Department of Battery Engineering Gachon UniversityGyeonggi-do 13120Republic of Korea School of Mechanical Engineering Soongsil UniversitySeoul 06978Republic of Korea

Ni-rich layered oxides in lithium-ion batteries have problems with gas generation and electrochemical performance reduction due to residual lithium's reaction on the surface with the *** address this issue,in this study,the Acid solvent evaporation(AsE)method has been proposed as a potential method to remove residual lithium while promoting the formation of a new LiNO_(3)-derived co.ting layer on the cathode *** reduction of residual lithium using the ASE method and the co.struction of a LiNO_(3)-derived co.ting layer suppresses gas evolution caused by the side effects of the electrolyte,improves electrochemical performance,and improves thermal stability by facilitating the smooth movement of lithium ***,the structural stability and resistance change due to the LiNO_(3)-derived co.ting layer effects is guaranteed through cycling and DCIR of the pouch *** a result,co.pared to Pristine,the capacity retention of co.n cells increased by 8%after 100 cycles,and pouch cells increased by 25%after 160 *** addition,after cycling the pouch cell,co.(2) gas has significantly reduced by about 30%co.pared to Pristine using gas *** ASE method effectively forms a robust LiNO_(3)-derived co.ting layer on the cathode active material,which helps minimize electrolyte reactivity,suppress ,co.(2) emissions,enhance surface structure stability,improve thermal stability,and improveoverallbatteryperformance.

关键词： Lithium-ion batteries Ni-rich NCM Acid solvent evaporation LiNO_(3)-derived co.ting Gasevolution