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Molecular engineering binuclear copper catalysts for selec.ive cO_(2) reduc.ion to c_(2) products

Journal of Energy chemistry 2024年第6期93卷 166-173,I0005页

作者： Qi Zhao kai Lei bao Yu Xia Rachel crespo-Otero Devis Di Tommaso Department of chemistry School of Physical and Chemical SciencesQueen Mary University of LondonLondonE14NSUK Key Laboratory of Material chemistry for Energy conversion and Storage(Ministry of Education) Hubei Key Laboratory of Material Chemistry and Service FailureState Key Laboratory of Materials Processing and Die&Mould TechnologySchool of Chemistry and Chemical EngineeringHuazhong University of Science and Technology(HUST)Wuhan 430074HubeiChina Department of chemistry University College LondonLondonWC1H 0AJUK Digital Environment Research institute Queen Mary University of LondonEmpire HouseLondon E11HHUK

Molecular copper catalysts serve as exemplary models for correlating the structure-reac.ion-mechanism relationship in the electrochemical cO_(2) reduc.ion(ecO_(2)R),owing to their adaptable environments surrounding the copper metal *** investigation,employing density func.ional theory calculations,focuses on a novel family of binuclear cu molecular *** modulation of their coordination configuration through the introduc.ion of organic groups aims to assess their efficacy in converting cO_(2) to c_(2)*** findings highlight the crucial role of chemical valence state in shaping the characteristics of binuclear cu catalysts,consequently influencing the ecO_(2)R behaviour,Notably,the cu(Ⅱ)cu(Ⅱ)macrocycle catalyst exhibits enhanced suppression of the hydrogen evolution reac.ion(HER),facilitating proton trans fer and the ecO_(2)R *** rthermore,we explo re the impact of diverse electro n-withdrawing and electron-donating groups coordinated to the macrocycle(R=-F,-H,and-OcH_3)on the electron distribution in the molecular *** placement of-OcH_3 groups in the macrocycles leads to a favourable oxidation state of the cu centres and subsequent c-c coupling to form c_(2) *** research provides fundamental insights into the design and optimization of binuclear cu molecular catalysts for the electrochemical conversion of cO_(2) to value-added c_(2) products.

关键词： Molecular catalyst design Selec.ive cO_(2)reduc.ion c_(2)products Density func.ional theory calculations

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Multi-physical fields distribution in billet during helical electromagnetic stirring:A numerical simulation research

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c.ina Foundry 2024年第1期21卷 51-59页

作者： Dong Pan Qing-tao Guo kai-lun Zhang Fu-zhi Yu Yu-ying Li Yu-bao Xiao State Key Laboratory of Metal Materials for Marine Equipment and Application Anshan 114009LiaoningChina Ansteel Beijing Research institute co. Ltd.Beijing 102200China

Electromagnetic stirring is one of the widely applied techniques to modify the quality of casting *** from conventional rotate stirring,the helical stirring is more professional in assisting multi-dimensional flow of molten metal and eliminating solidification *** this study,the single-winding helical stirring(SWHS)was introduced,offering advantages such as smaller volume and lower electromagnetic shielding compared to traditional helical stirring *** a comprehensive numerical simulation,the stirring parameters of SWHS were adjusted to yoke inc.ination angle of 43°and frequency of 12 *** higher electromagnetic force and flow velocity in drawing direc.ion,as well as the lower temperature gradient induced by the SWHS,are positive factors for homogeneous solidification of *** experimental results on Al-8%Si alloy and 0.4%c-1.1%Mn steel demonstrate that compared to rotate stirring,the SWHS process can induce better billet quality and is more effec.ive in accelerating the equiaxed expansion and reducing element *** SWHS process can enhance the equiaxed ratio of the billet by 58.3%and reduce segregation degree of carbon element by 10.97%.consequently,SWHS holds great promise as a potential approach for improving the quality of continuous casting billets.

关键词： billet electromagnetic stirring helical solidification element segregation numerical simulation

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High Seebeck coefficient Thermally chargeable Supercapacitor with Synergistic Effect of Multichannel ionogel Electrolyte and Ti3c2Tx MXene-Based composite Electrode

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ENERGY & ENViRONMENTAL MATERiALS 2024年第6期7卷 367-377页

作者： chen, Zhongming Du, Zhijian Li, La Jiang, kai chen, Di Shen, Guozhen Univ Sci & Technol Beijing Sch Math & Phys Beijing 100083 Peoples R China Beijing inst Technol Sch Integrated Circuits & Elect Beijing 100081 Peoples R China c.inese PLA Chinese PLA Gen Hosp Inst Hepatobiliary Surg Chinese PLA Fac Hepatopancreato Biliary Surg Beijing 100853 Peoples R China c.inese PLA Key Lab Digital Hepetobiliary Surg Beijing 100853 Peoples R China

Thermally chargeable supercapacitors can collect low-grade heat generated by the human body and convert it into electricity as a power supply unit for wearable electronics. However, the low Seebeck coefficient and heat-to-electricity conversion efficiency hinder further application. in this paper, we designed a high-performance thermally chargeable supercapacitor device composed of ZnMn2O4@Ti3c2Tx MXene composites (ZMO@Ti3c2Tx MXene) electrode and UiO-66 metal-organic framework doped multichannel polyvinylidene fluoridehexafluoro-propylene ionogel electrolyte, which realized the thermoelectric conversion and electrical energy storage at the same time. This thermally chargeable supercapacitor device exhibited a high Seebeck coefficient of 55.4 mV K-1, thermal voltage of 243 mV, and outstanding heat-to-electricity conversion efficiency of up to 6.48% at the temperature difference of 4.4 K. in addition, this device showed excellent charge-discharge cyc.ing stability at high-temperature differences (3 K) and low-temperature differences (1 K), respec.ively. connec.ing two thermally chargeable supercapacitor units in series, the generated output voltage of 500 mV further confirmed the stability of devices. When a single device was worn on the arm, a thermal voltage of 208.3 mV was obtained indicating the possibility of application in wearable electronics.

关键词： ionogel electrode Soret effect thermally chargeable supercapacitor Ti3c2Tx MXene UiO-66 MOF GELS

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Enhancement of low-temperature toughness of Fe-Mn-c-Al alloy by rare earth ce-modified inclusions

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Journal of iron and Steel Research international 2024年第1期31卷 157-173页

作者： Guang-kai Yang chang-ling Zhuang Yi-zhuang Li chen Hu Shao-bo Li college of Materials and Metallurgy Guizhou UniversityGuiyang550025GuizhouChina Department of Mechanical Engineering University of Hong KongHong Kong999077China The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819LiaoningChina State Key Laboratory of Public Big Data Guizhou UniversityGuiyang550025GuizhouChina

Fe-Mn-c-Al alloys have been recognized as promising materials for certain low-temperature applications due to their exceptional mechanical properties and ***,their limited low-temperature toughness restricts their large-scale applications in specific *** influence of trace amounts of rare earth cerium(ce)on the low-temperature toughness of Fe-18Mn-0.6c-1.8Al alloys was *** addition of ce effec.ively alters the inclu-sions in the alloy,transforming large-sized irregular inclusions into fine ellipsoidal rare earth *** leads to a significant reduc.ion in both the proportion and average size of the inclusions,resulting in their effec.ive dispersion throughout the matrix and improved cryogenic *** presence of ce-containing inclusions within the matrix reduces stress concentration,thereby inhibiting microcrack formation and improving impact absorption ***-cally,the addition of rare earth ce alters the fracture behavior of the material at room temperature and low temperature,changing from brittle cleavage fracture to a more duc.ile failure *** impact toughness of the Fe-Mn-c-Al alloy is significantly improved by the addition of 0.0048 wt.%ce,particularly at-196℃where the impact toughness reaches 103.6 J/cm^(2),representing an impressive improvement of 87.3%.

关键词： Fe-Mn-c-Al alloy Rare earth Low-temperature toughness inclusion Fracture

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Acetylene/argon mixture plasma to build ultrathin carbon bridge of cF_(x)/c/MnO_(2) for high-rate lithium primary battery

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Rare Metals 2024年第6期43卷 2574-2584页

作者： Da-Wei Zou Xing-Guang Fu Gao-Bang chen Yi-Fan Liu bao-Shan Wu Xian Jian School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China Yangtze Delta Region institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 31300lChina

Forming an ultrathin conduc.ing layer on a fluorinated carbon(cFx)surface for reducing severe electrochemical polarization in lithium/fluorinated carbon primary batteries(Li/cF_(x))remains a considerable challenge for ac.ieving batteries with excellent rate ***,cFxwas modified by using acetylene/argon mixture plasma combined with MnO_(2)*** cF_(x)/c/MnO_(2)composite effec.ively reduced the voltage hysteresis and improved the electrochemical performance of Li/cF_(x).The excellent rate performance of cF_(x)/c/MnO_(2)was due to the high electrochemical ac.ivity provided by the atomicscale conduc.ive carbon layer and ultrafine MnO_(2)*** with pristine cF_(x),the charge transfer resistance of the optimized cF_(x)/c/MnO_(2)decreased from 218.5 to 48.2Ω,the discharge rate increased from 2c to 10c,and the power density increased from 3.11 to 13.44 kW·g^(-1),The intrinsic reason for the enhanced rate performance was attributed to the fact that the ultrathin carbon layer acted as a conduc.ive bridge to reduce the voltage hysteresis at the initial stage of the Li/cF_(x)discharge,and the high electrochemical ac.ivity of the ultrafine MnO_(2)particles provided a faster lithium-ion diffusion rate.

关键词： c_(2)H_(2)/Ar plasma Fluorinated carbon Lithium primary battery MnO_(2)

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Hydrogen and nitrogen absorption properties of ce-added Zr_(2)(Fe_(1-x)Ni_(x)) alloys

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Journal of Rare Earths 2024年第6期42卷 1136-1141,I0005页

作者： kai Yin Xiaopeng Liu State Key Laboratory of Advanced Materials for Smart Sensing GRINM Group Co.Ltd.Beijing10088China GRiMAT Engineering institute co. Ltd.Beijing101407China General Research institute of Nonferrous Metals Beijing100088China

To improve the nitriding resistance of Zr_(2)Fe alloy,the ce-added Zr_(2)(Fe_(1-x)Ni_(x))(x=0,0.15,0.3,0.5)alloys were prepared by magnetic levitation melting *** effects of Ni substitution for Fe on the phase structure,hydrogen and nitrogen absorption properties of the alloys were investigated by X-ray diffrac.ion,scanning electron microscopy and p-c.isotherm *** experimental results show that Ni substitution can effec.ively inhibit the formation of both α-Zr and ZrFe_(2) phases and promote the formation of c16 structure Zr_(2)(Fe,Ni)phase,causing Ni-substituted alloys to exhibit low nitrogen absorption rate and *** 623 K under 0.5 MPa nitrogen pressure,the nitrogen absorption capacity of ce-added Zr_(2)(Fe_(0.5)Ni_(0.5))alloy reaches to 0.8 mL/g,much lower than that of Zr_(2)Fe alloy(1.5 mL/g).Ni substitution decreases the crystal cell volume of the c_(16)Zr_(2)(Fe,Ni)phase,resulting in an increase in the hydrogen absorption equilibrium *** 623 K under 0.05 MPa hydrogen pressure,the hydrogen absorption capacity decreases from 1.46 wt%of Zr_(2)Fe alloy to 1.41 wt%of ce-added Zr_(2)(Fe_(0.5)Ni_(0.5))alloy.

关键词： Zr_(2)Fe alloy ce Pressure-composition isotherm Hydrogen absorption Nitrogen absorption Rare earths

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Bioinspired direc.ional structures for inhibiting wetting on super-melt-philic surfaces above 1200°c

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international Journal of Extreme Manufacturing 2024年第4期6卷 337-346页

作者： Hujun Wang Xiuyuan Zhao Zhengcan Xie Biao Yang Jing Zheng kai Yin Zhongrong Zhou Tribology Research institute State Key Laboratory of Rail Transit Vehicle SystemSchool of Mechanical EngineeringSouthwest Jiaotong UniversityChengdu 610031People's Republic of China Hunan Key Laboratory of Nanophotonics and Devices School of PhysicsCentral South UniversityChangsha 410083People's Republic of China

Over the past two decades,superhydrophobic surfaces that are easily created have aroused considerable attention for their superior performances in various applications at room ***,there is a growing demand in special fields for the development of surfaces that can resist wetting by high-temperature molten droplets(>1200°c)using facile design and fabrication ***,bioinspired direc.ional structures(BDSs)were prepared on Y2O3-stabilized ZrO2(YSZ)surfaces using femtosecond laser *** from the anisotropic energy barriers,the BDSs featured with no additional modifiers showed a remarkable increase from 9.2°to 60°in the contact angle of caO–MgO–Al2O3–SiO2(cMAS)melt and a 70.1%reduc.ion in the spreading area of cMAS at 1250°c,compared with polished super-cMAS-melt-philic YSZ ***,the BDSs demonstrated exceptional wetting inhibition even at 1400°c,with an increase from 3.3°to 31.3°in contact angle and a 67.9%decrease in spreading *** work provides valuable insight and a facile preparation strategy for effec.ively inhibiting the wetting of molten droplets on super-melt-philic surfaces at extremely high temperatures.

关键词： direc.ional structures bioinspired design inhibiting wetting super-melt-philic superhydrophobic

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High-temperature oxidation resistance of Si-coated c/Sic composites

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Rare Metals 2024年第9期43卷 4566-4572页

作者： Jie Xiao Hua-Yue Zhang Sheng-kai Gong Hui-Bin Xu Hong-Bo Guo School of Materials Science and Engineering Beihang University Key Laboratory of High-Temperature Structure Materials and Protec.ive coatings (Ministry of industry and information Technology) Beihang University

in this paper, Si coatings were sprayed onto c/Si c composite substrates by atmospheric plasma spraying(APS). The high-temperature oxidation behavior of the substrate and coating at temperatures of 1100 and 1300 °c was also studied. The c/Si c ceramic matrix composite will be damaged seriously and even failed due to the oxidation of carbon fibers in matrix. The Si coating effec.ively improved the oxidation resistance of the c/Si c substrate in the high-temperature oxidation test. The effect of the thickness of the Si coatings on the oxidation resistance was investigated. The 150-μm coating is proved to enable the substrate to have the lowest oxidation weight loss and the best oxidation resistance after static oxidation for 5 h.

关键词： carbon fiber ceramic matrix composites (cMcs) Oxidation Plasma spray Si coating

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Photocatalytic.in situ H_(2)O_(2) produc.ion and ac.ivation for enhanced ciprofloxacin degradation over ceO_(2)-co_(3)O_(4)/g-c_(3)N_(4):key role of ceO_(2)

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Rare Metals 2024年第6期43卷 2695-2707页

作者： Hong-Jie Zhu Yi-kai Yang Ming-Hui Li Lu-Ning Zou Hai-Tao Zhao Shandong Provincial Key Laboratory of chemical Energy Storage and Novel cell Technology School of Chemistry and Chemical Engin college of Ecology and Environment Anhui Normal UniversityWuhu241002China Liaocheng YiLu Advanced Materials co. LtdLiaocheng 252000China

The abused ciprofloxacin antibiotics have caused significant environmental *** oxidative degradation of ciprofloxacin exhibits promising efficacy,it often entails excessive energy ***,it is necessary to explore an effec.ive and ecologically sustainable degradation ***,we demonstrated that g-c_(3)N_(4) decorated with the coordinated ceO_(2)and co_(3)O_(4)(ceO_(2)-co_(3)O_(4)/cN)exhibited effec.ive ciprofloxacin photodegradation via in situ H_(2)O_(2) produc.ion and ac.ivation *** indicate that the introduced ceO_(2) enhances the transference of photogenerated electrons to O_(2) by adjusting the oxygen vacancy of photocatalyst,thereby increasing the generation of superoxide radicals,which in turn generate H_(2)O_(2),resulting in a 22.4-fold increase in H_(2)O_(2) generation over g-c_(3)N_(4).Moreover,the in situ H_(2)O_(2)generation facilitated by ceO_(2) is confirmed to be essential for ciprofloxacin degradation via ceO_(2)-co_(3)O_(4)/cN,as it provides enough oxidant for co_(3)O_(4) to ac.ivate into hydroxyl radicals for the pollutants ***,ceO_(2)-co_(3)O_(4)/cN ac.ieves a ciprofloxacin degradation ratio of 97.7%within 80 *** study introduces a novel approach that combines H_(2)O_(2) generation and ac.ivation,offering an innovative perspec.ive for ac.ieving clean and efficient purification of antibiotic-contaminated water.

关键词： ceO_(2) in situ H_(2)O_(2)generation ciprofloxacin degradation Photocatalyst

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High performance 2T0c DRAM cells based on atomic-layer-deposited inAlZnO FETs

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Science c.ina(information Sciences) 2024年第9期67卷 344-345页

作者： Wen XiONG Binbin LUO Wei MENG bao ZHU Xiaohan WU Shi-Jin DiNG School of Microelectronics Fudan University

Recently, the oxide semiconductor-based 2T0c dynamic random-access memory(DRAM) has shown great potential in monolithic three-dimensional(M3D)-integrated memory,owing to some unique advantages of oxide semiconductors,such as high electron mobility, wide band gap, and compatibility with back-end-of-line(BEOL) processes [1, 2].

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