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Simultaneously improving mechanical properties and oxidation resistance of Ti-bearing high-entropy superalloys at intermediate temperature via silicon addition

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Journal of Materials Science & Technology 2023年第26期157卷 30-41页

作者： Shaofei Liu Weicheng Xiao Bo Xiao Jiang Ju Yinghao Zhou Yilu Zhao Zengbao Jiao Junhua Luan Qian Li Jinxiong Hou Ji-jung Kai Tao Yang Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Center for Advanced Nuclear Safety and Sustainable Development City University of Hong KongHong Kong 999077China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China Hong Kong Institute for Advanced Study City University of Hong KongHong Kong 999077China

Ti-bearing high-entropy superalloys(HESAs)often suffer from severe intergranular embrittlement and terrible oxidation degradation at intermediate *** we showcase that minor Si addition can effectively mitigate the intergranular embrittlement and improve the oxidation resistance of the a(Ni_(2)Co_(2)FeCr)_(92) Ti_(4)Al_(4) HESA at 700℃ *** analysis revealed that the intergranu-lar G phase induced by 2 at%Si addition can effectively suppress the inward diffusion of oxygen along grain boundaries at 700℃,thus enhancing the tensile ductility of the alloy from∼8.3%to∼13.4%.Be-sides,the 2 at%Si addition facilitated the formation of a continuous Al_(2)O_(3) layer during oxidation,con-tributing to a remarkable reduction in the growth rate of the oxide scale to a quarter of the Si-free *** results demonstrate that Si can be a favorable alloying element to design advanced HESAs with syn-ergistically improved thermal-mechanical performance.

关键词： High-entropy superalloy Mechanical property Oxidation behavior intermediate temperature Silicon addition

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Radio-frequency magnetron sputtered thin-film La_(0.5)Sr_(0.5)Co_(0.95)Nb_(0.05)O_(3-δ) perovskite electrodes for intermediate temperature symmetric solid oxide fuel cell(IT-SSOFC)

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Materials Reports(Energy) 2022年第2期2卷 75-85页

作者： Vicky Dhongde Aditya Singh Jyotsana Kal Uzma Anjum M.Ali Haider Suddhasatwa Basu Chemical Engineering Department Indian Institute of Technology DelhiHauz KhasNew Delhi110016India Department of Physics Indian Institute of Technology DelhiHauz KhasNew Delhi110016India National University of Singapore 21 Lower Kent Ridge Rd119077Singapore

The present work explores the application of La_(0.5)Sr_(0.5)Co_(0.95)Nb_(0.05)O_(3-δ)(LSCNO)perovskite as electrode material for the symmetric solid oxide fuel *** solid oxide fuel cells of thin-film LSCNO electrodes were prepared to study the oxygen reduction reaction at intermediate *** Rietveld refinement of syn-thesized material shows a hexagonal structure with the R-3c space group of the prepared perovskite *** parameter and fractional coordinates were utilized to calculate the oxygen ion diffusion coefficient for molecular dynamic *** 973 K,the oxygen ion diffusion of LSCNO was 1.407×10^(-8)cm^(2)s^(-1) higher by order of one magnitude than that of the La_(0.5)Sr_(0.5)Co_(0.95)Nb_(0.05)O_(3-δ)(7.751×10^(-9)cm^(2)^(-1)).The results suggest that the Nb doping provide the structural stability which improves oxygen anion *** enhanced structural stability was analysed by the thermal expansion coefficient calculated experimentally and from molecular dynamics ***,the density functional theory calculation revealed the role of Nb dopant for oxygen vacancy formation energy at Sr-0 and La-O planes is lower than the undoped *** understand the rate-limiting process for sluggish oxygen diffusion kinetics,80 nm and 40 nm thin films were fabricated using radio frequency magnetron sputtering on gadolinium doped ceria electrolyte *** impedance was observed to increase with an increasing thickness,suggesting the bulk diffusion as a rate-limiting step for oxygen ion *** electrochemical performance was analysed for the thin-flm symmetric solid oxide fuel cell,which achieved a peak power density of 390 mW cm^(-2) at 1.02 V in the presence of H_(2) fuel on the anode side and air on the cathode side.

关键词： Symmetric solid oxide fuel cell Thin-film electrode Diffusion coefficient Molecular dynamics Radio-frequency magnetron sputtering intermediate temperature

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The Composite Cathode of Ag and LSCF for SOFC Working under intermediate temperature

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复旦学报（自然科学版） 2007年第5期46卷 681-页

作者： A.Hirano Y.Sakito N.Imanishi Y.Takeda Deparment of Chemistry Mie University

1 Introduction The composite electrode of La0.6Sr0.4Co0.2Fe0.8O3(LSCF) and Ag was studied as a new air electrode system for reduced-temperature *** LSCF/Ag composite electrodes were prepared by baking the LSCF electrode with various Ag solution infiltrated in the pores of the *** all cases,the cathode polarization resistance was reduced,which may be brought from the catalytic activity of Ag *** example,the power density of LSCF electrode on anode supported cell was increased from 0....

关键词： SOFC intermediate temperature cathode composite

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Hydrogen production at intermediate temperatures with proton conducting ceramic cells:Electrocatalytic activity,durability and energy efficiency

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Journal of Energy Chemistry 2023年第11期86卷 437-446,I0010页

作者： Haoyu Zheng Feng Han Noriko Sata Rémi Costa Institute of Engineering Thermodynamics German Aerospace Center (DLR) Institute for Building Energetics Thermotechnology and Energy Storage (IGTE) University of Stuttgart

Proton conducting ceramic cells(PCCs)are an attractive emerging technology operating in the intermediate temperature range of 500 to 700℃.In this work,we evaluate the production of hydrogen at intermediate temperatures by proton conducting ceramic cell electrolysis(PCCEL).We demonstrate a highperformance steam electrolysis owing to a composite positrode based on BaGd_(0.8)La_(0.2)Co_(2)O_(6-δ)(BGLC1082)and BaZr0.5Ce0.4Y0.1O3-δ(BZCY541).The high reliability of PCCEL is demonstrated for 1680 h at a current density as high as-0.8 A cm^(-2)close to the thermoneutral cell voltage at 600℃.The electrolysis cell showed a specific energy consumption ranging from 54 to 66 kW h kg^(-1)that is comparable to state-of-the-art low temperature electrolysis technologies,while showing hydrogen production rates systematically higher than commercial solid oxide ceramic cells(SOCs).Compared to SOCs,the results verified the higher performances of PCCs at the relevant operating temperatures,due to the lower activation energy for proton transfer comparing with oxygen ion ***,because of the p-type electronic conduction in protonic ceramics,the energy conversion rate of PCCs is relatively lower in steam *** faradaic efficiency of the PCC in electrolysis mode can be increased at lower operating temperatures and in endothermic conditions,making PCCEL a technology of choice to valorize high temperature waste heat from industrial processes into *** increase the faradaic efficiency by optimizing the materials,the cell design,or the operating strategy is a key challenge to address for future developments of PCCEL in order to achieve even more superior techno-economic merits.

关键词： Steam electrolysis Hydrogen production Proton conducting ceramics intermediate temperature Energy efficiency

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