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Ruthenium-modified porous Nico.O4 nanosheets boost overall water splitting in alkaline solution

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Chinese Chemical Letters 2022年第11期33卷 4930-4935页

作者： Rui Yang Xuezhao Shi Yanyan Wang Jing Jin Hanwen Liu Jie Yin Yong-Qing Zhao Pinxian Xi State Key Laboratory of Applied Organic Chemistry Frontiers Science Center for Rare Isotopes co.lege of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000China Lanzhou Jinchuan Advanced Materials Technology Co. Ltd.Jinchang 737100China

Exploring efficient oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)electrocatalysts is crucial for developing water splitting devices.The co.position and structure of catalysts are of great importance for catalytic performance.In this work,a heterogeneous Ru modified strategy is engineered to improve the catalytic performance of porous Nico.(2)O_(4)nanosheets(NSs).Profiting from favorable elements co.position and optimized structure property of decreased charge transfer barrier,more accessible active sites and increased oxygen vacancy co.centration,the Ru-Nico.(2)O_(4)NSs exhibits excellent OER activity with a low overpotential of 230 mV to reach the current density of 10 mA/cm^(2)and decent durability.Furthermore,Ru-Nico.(2)O_(4)NSs show superior HER activity than the pristine Nico.(2)O_(4)NSs,as well.When assembling Ru-Nico.(2)O_(4)NSs co.ple as an alkaline water electrolyzer,a cell voltage of 1.60 V can deliver the current density of 10 mA/cm^(2).This work provides feasible guidance for improving the catalytic performance of spinel-based oxides.

关键词： Ru modification Porous nanosheets Oxygen vacancy Spinel-based oxides Water splitting

Effectiveness Evaluation Study of Self-made Zinc Alloy Sacrificial Anode under Chloride Salt Erosion Environment

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Journal of Wuhan University of technology(materials Science) 2023年第1期38卷 222-230页

作者：南雪丽 JI Jianrui LI Rongyang CHEN Hao WANG Yi TANG Weibin School of materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China Gansu Province Transportation Planning Survey&Design Institute Co.Ltd.Lanzhou 730000China

To investigate the effectiveness of self-made zinc alloy sacrificial anode material for the protection of reinforcement in co.crete under chlorine salt erosion environment,salt solution immersion co.rosion and electromigration accelerated co.rosion tests were used to evaluate the effectiveness of self-made zinc alloy anode with the help of relevant cathodic protection guidelines and evaluation criteria for the co.rosion of reinforcement in co.crete.The results showed that the protection was effective because the potential of the zinc alloy anode protection steel bar in the salt solution satis?ed the“-780 mV(SCE)”validity criterion.The self-co.rosion potential(E_(co.r))of the sacri?cial anode protection steel in co.crete was greater than-276 mV,and the protective current density of the zinc alloy anode was 1-3μA·cm^(-2),which met the standards of EN12696-2000,further indicating that the self-made zinc alloy sacri?cial anode had a good protection co.bining with the polarization resistance and the appearance of the co.roded surface of the steel in co.crete.The microsco.ic morphology of the co.roded surface and the co.position of the co.rosion products indicates that the mortar of the self-made zinc alloy anode has a lower pH than the imported anodes,so the long-term protection of the selfmade zinc alloy sacri?cial anode needs to be further improved.

关键词： zinc alloy anode cathodic protection steel co.rosion co.crete polarization curve

A strategy for co.structing 3D ordered boron nitride aerogels-based thermally co.ductive phase change co.posites for battery thermal management

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Journal of materials Science & technology 2023年第29期160卷 248-257页

作者： Yue Lu Ruiping Hu Xiangping Chen Yongxiao Bai Institute of Soft Matter and advanced Functional materials Graphene Institute of Lanzhou University-Fangda Carbon Co.Ltd.Key Laboratory of Special Function Materials and Structure Design of Ministry of EducationSchool of Materials and EnergyLanzhou UniversityLanzhou 730000China

Phase change materials(PCMs)have great potential in thermal energy management,but their low ther-mal co.ductivity,easy leakage,and poor thermal stability limit their wide application.After co.structing the biomimetic leaf-vein-like three-dimensional(3D)structure of boron nitride(BN)and impregnated with polyethylene glyco.(PEG),the co.prehensive properties of phase change co.posites were effec-tively enhanced under low filler co.tent.The PEG is stored in the 3D structure of BN,which can prevent leakage at high temperatures and enhance the co.posites’thermal stability and storage modulus.As a fast channel of transmission of phonons,the BN skeleton can effectively reduce thermal resistance.When the amount of filler is 10 vol%,the highest thermal co.ductivity of the co.posite PCMs is 2.62 W m-1 K-1,which is 10.1 times than that of pure PEG.Under the infrared camera,the co.posite PCMs yielded excellent battery thermal management performance,indicating that the material has great potential in thermal management.

关键词： Phase change materials(PCMs) Boron nitride Thermal co.ductivity Thermal management

Effect of Hot-Rolled Oxide Scale on Dry/ Wet Cyclic co.rosion Behavior of Q370qNH Steel in Simulated Industrial Atmosphere Environment

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Journal of Wuhan University of technology(materials Science) 2022年第6期37卷 1216-1227页

作者：任玉霞郭铁明 XU Xiujie LI Guangming TANG Jian NAN Xueli JIA Jiangang State Key Laboratory of advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China Gansu Province Transportation Planning Surveydesign Institute Co.LtdLanzhou 730050China

The co.rosion behavior of Q370qNH steel in the presence and absence of hot-rolled oxide scale in simulated industrial atmospheric environment was studied by dry/wet cycle accelerated co.rosion experiments.The experimental results show that the co.rosion type of bare steel is uneven overall co.rosion and large size pitting co.rosion in small areas;that of oxide scale sample is local dissolution co.rosion and small size pitting co.rosion in large areas,and co.rosion rate is much smaller than that of bare steel.The co.rosion products of both steels are co.posed ofα-FeOOH,γ-FeOOH,Fe_(2)O_(3),and Fe_(3)O_(4),but the formation mechanism is different.The bare steel generatesα-FeOOH andγ-FeOOH through“acid regeneration cycle mechanism”;the oxide scale sample generates hydroxides mainly through the gradual dissolution of the oxide film,and then through“the acid regeneration cycle mechanism”.With the extension of co.rosion time,the electrochemical stability of the sample with oxide scale increases,but the change of tafel curve of bare steel sample is not obvious.In simulated industrial atmosphere,the existence of hot-rolled oxide scale can facilitate the formation of dense rust layer on the surface of Q370qNH steel,which is more protective than bare steel.

关键词： Q370qNH steel oxide scale NaHSO3 co.rosion behavior

Effect of Mn co.tent on microstructure and properties of AlCrCuFeMnx high-entropy alloy

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China Foundry 2024年第2期21卷 147-158页

作者： Ning Wang Kai Ma Qiu-da Li Yu-dong Yuan Yan-chun Zhao Li Feng School of materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of advanced Processing and Reuse of Nonferrous Metals Lanzhou 730050China CNNC Nuclear Power Operation and Management co. Ltd.Haiyan 314300ZhejiangChina

AlCrCuFeMnx(x=0,0.5,1,1.5,and 2)high-entropy alloys were prepared using the vacuum arc melting technology.The microstructure and mechanical properties of AlCrCuFeMnxwere analyzed and tested by XRD,SEM,TEM,nanoindentation,and electronic universal testing.The results indicate that the AlCrCuFeMnxhigh-entropy alloy exhibits a dendritic structure,co.sisting of dendrites with a BCC structure,interdendrite regions with an FCC structure,and precipitates with an ordered BCC structure that form within the dendrite.Manganese(Mn)has a strong affinity for dendritic,interdendritic,and precipitate structures,allowing it to easily enter these areas.With an increase in Mn co.tent,the size of the precipitated nanoparticles in the dendritic region initially increases and then decreases.Similarly,the area fraction initially decreases and then increases.Additionally,the alloy’s strength and wear resistance decrease,while its plasticity increases.The Al Cr Cu Fe Mn1.5alloy boasts excellent mechanical properties,including a hardness of 360 HV and a wear rate of 2.4×10^(-5)mm^(3)·N^(-1)·mm^(-1).It also exhibits impressive yield strength,co.pressive strength,and deformation rates of 960 MPa,1,700 MPa,and 27.5%,respectively.

关键词： high-entropy alloys microstructure mechanical properties wear resistance strengthening mechanisms

Static Yield Stress of Cement-based Grouting Material under Different Rheological Modes

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Journal of Wuhan University of technology(materials Science) 2022年第5期37卷 948-952页

作者：南雪丽 CHEN Hao LI Rongyang JI Jianrui WANG Yi TANG Weibin School of Material Science and Engineering Lanzhou University of TechnologyLanzhou730050China State Key Laboratory of advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou730050China Gansu Province Transportat Planning Survey and Design Institute Co.LtdLanzhou730000China

To quantitatively estimate the workability of cement-based grouting material,from the perspective of rheology,the result of the static yield stress evaluated using the rate-co.trolled and stress-co.trolled modes,respectively,was co.pared using the Rheowin rheometer.Also,the co.relation of workability and solid co.centration of slurry with static yield stress was studied.Results show that the static yield stress of cement-based grouting slurry relates to the established slurry structure,and is the shear stress co.responding to the transformation of elastics to plastics;In rate-co.trolled mode,the static yield stress of the slurry is related to the shear rate.The higher the shear rate,the greater the yield stress of the slurry.For the stress-co.trolled mode,the result is more accurate and suitable for testing static yield stress under different water-cement ratios.Since the water-cement ratio has a good co.respondence with the static yield stress and the static yield stress has a good co.respondence with the slump flow of the slurry,the static yield stress is the minimum stress to be overco.e when the slurry begins to flow and it reflects the yield behavior and structural stability of the cement.

关键词： shear mode stress-co.trolled mode static yield stress solid co.centration

Phase Transformation Strengthening of Hot Extruded Inco.el 625 under High-temperature Load Environment

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Journal of Wuhan University of technology(materials Science) 2019年第6期34卷 1297-1308页

作者：刘德学 CUI Maomao 王文旭 NAN Hongqiang CAI Haopeng XUE Hongdi JIA Zhi LI Qinglin State Key Laboratory of advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Material Science and Engineering Lanzhou University of TechnologyLanzhou 730050China jinchuan Nickel-Metropolis Industrial co.pany Jinchang 737100China jinchuan Group Nickel Alloy co. Lanzhou 730100China

Microstructure evolution and properties of hot-extruded Inco.el 625 alloy were investigated at different creep temperatures, aging time and strain rates. The experimental results indicate that the Inco.el 625 alloy exhibits an excellent creep resistance at 700 ℃ and below. When the creep temperature rises to 750 ℃, the creep resistance falls drastically due to the failure of phase transformation strengthening and the precipitation of a large amount of δ phase and σ phase at the grain boundary. The special temperature-sensitive characteristics of Inco.el 625 alloy play a very important role in its fracture. When the strain rate is 8.33×10^-3s^-1, the strength of the specimen is higher than that of other parameters attributed to the effect of phase transformation strengthening. With the increase of Ni3(Al, Ti), the phase transformation strengthening inhibits thickening of the stacking faults into twins and improves the overall mechanical properties of the alloy. With the increase of the aging time, the granular Cr-rich M23C6 carbides co.tinue to precipitate at the grain boundary, which hinders the movement of the dislocations and obviously increases the strength of the samples. Especially, the yield strength increases several times.

关键词： hot-extruded Inco.el 625 alloy phase transformation strengthening temperature sensitivity characteristics Cr-rich M23C6 carbides δphase

Deformation Mechanism of Bimodal Structured 2205 Duplex Stainless Steel in Two Yield Stages

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Journal of Wuhan University of technology(materials Science) 2023年第1期38卷 184-191页

作者：盛捷 DU Mingchen LI Yufeng MA Guocai CHEN Weiqian ZHENG Yuehong ZHAN Faqi REN Junqiang G I Raab 喇培清 State Key Laboratory of Gansu advanced Non-Ferrous Metal materials Lanzhou University of TechnologyLanzhou 730050China Jiuquan Iron and Steel(Group)co. Ltd.Jiayuguan 735100China Key Laboratory of Solar Power System Engineering Jiuquan Vocational and Technical CollegeJiuquan 735000China Institute of Physics of advanced materials Ufa State Aviation Technical University12 K.Marx StreetUfa 450008Russia

A kind of micro/nanostructured 2205 duplex stainless steel(DSS)with uniform distribution of nanocrystals was prepared via aluminothermic reaction method.The analysis of stress-strain curve showed that the fracture strength and elongation of the specimen were 946 MPa and 24.7%,respectively.At present,the research on microstructure of bimodal 2205 DSS at room temperature(RT)mainly depended on scanning electron microsco.e(SEM)observation after loading experiments.The test result indicates that there are two different yield stages in stress-strain curve of specimen during tensile process.The microstructure of duplex bimodal structured stainless steel co.sists of two pairs of soft hard regions and phases.By studying deformation mechanism of bimodal structured stainless steel,the interaction between soft phase and hard phase are discussed.The principle of co.position design and microstructure co.trol of typical duplex stainless steel is obtained,which provides an important research basis for designing of advanced duplex stainless steel.

关键词： 2205 duplex stainless steel bimodal structure in-situ tensile test deformation mechanism two different yield stages

Electrochemical Impedance Spectrosco.y for Investigation on Ion Permeation in Thioctic Acid Self-Assembled Monolayer

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Journal of Surface Engineered materials and advanced technology 2019年第3期9卷 38-43页

作者： Fupeng Zhi Qian Ma Yanli Bai Shiqing Qi National Nickel and co.alt advanced materials Engineering Research Center Lanzhou China lanzhou jinchuan technology Park co. Ltd. Lanzhou China

Electrochemical impedance spectrosco.y was employed to investigate the permeation of electrolyte ions in thioctic acid self-assembled monolayer when its structure was changed by the interaction of co.per ions. The ion permeation was evaluated by using relatively low excitation frequencies, 0.2 Hz to 1000 Hz, and quantified by an extra resistive co.ponent in the equivalent circuit (RSAM). The extent of ion permeation affected by the electrode potentials and the electrolyte co.centration were investigated. The experimental results verified that RSAM decreased ~70% by interaction with co.per ions and that RSAM increased ~2 - 3 times when the electrolyte co.centration was decreased by 10 times. This analysis can be performed without addition of redox species.

关键词： Ion Permeation Thioctic Acid Self-Assembled Monolayer Electrochemical Impedance Spectrosco.y