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Ultrathin ternary PtNiGa nanowires for enhanced oxygen reduction reaction

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Chinese Chemical Letters 2024年第2期35卷 599-603页

作者： Giday Fisseha Yiping Hu Yanan Yu Shaojie Lu Dongsheng Ma Pei Nian Zheng Wang Qin Yue Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering School of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021China

Achieving high activity and durability for the oxygen reduction reaction(ORR)with an ultra-low amount of platinum is significant to promote the widespread application of proton exchange membrane fuel cells(PEMFCs).Here we report a new ultrathin(∼1 nm)ternary PtNiGa alloy nanowires(PtNiGa NWs)electrocatalyst,in which the presence of gallium(Ga)enhances the oxidation resistance of platinum(Pt)and nickel(Ni)and suppresses the dissolution of *** mass and specific activities of PtNiGa NWs are about 11.2 and 7.6 times higher than those of commercial Pt/C catalysts for ***,the mass activity of PtNiGa/C NWs nanocatalyst decreased only by 12.8%and largely retained its electrochemical surface area(ECSA)after 10,000 potential cycles,compared with 38%loss of ECSA for commercial Pt/C ***,this work provides a general guideline for preparing ternary alloy electrocatalysts and enhancing the activity and stability of the cathode ORR reaction of PEMFCs.

关键词： Ultrathin nanowires Gallium Oxygen reduction reaction ternary alloy Durability

PdMoSb trimetallene as high-performance alcohol oxidation electrocatalyst

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Nano Research 2023年第2期16卷 2041-2048页

作者： Junfeng Liu Qiuxia Wang Tong Li Yong Wang Huaming Li Andreu Cabot Institute for Energy Research School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang 212013China Catalonia Institute for Energy Research-IREC Sant Adriàde BesòsBarcelona 08930Spain ICREA Pg.Lluís Companys 23Barcelona 08010Spain

Metallenes are an emerging class of two-dimensional(2D)material with outstanding potential in ***,we present a new PdMoSb trimetallene produced by a facile wet-chemistry procedure and tested for the alcohol oxidation *** shows an extremely high Pd utilization and superior performance toward ethanol,methanol,and glycerol electro-oxidation compared with PdMo and commercial Pd/C *** results and density functional theory calculations reveal that the enhanced activity relies not only on the high surface area that characterizes the ultrathin 2D metallene structure,but also on the particular electronic configuration of *** facilitates OH−adsorption in the reactive-intermediate pathway and strongly enhances the CO tolerance in the poisoning-intermediate pathway for alcohol *** excellent alcohol oxidation performance of PdMoSb trimetallene demonstrates the high potential of multimetallenes in the field of electrocatalysis.

关键词： metallene ternary alloy 2D material alcohol oxidation reaction electrocatalysis

First-principles computational study of highly stable and active ternary PtCuNi nanocatalyst for oxygen reduction reaction

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Nano Research 2015年第10期8卷 3394-3403页

作者： Seung Hyo Noh Byungchan Han Takeo Ohsaka DepartmentofElectronicChemistry InterdisciplinaryGraduateSchoolofScienceandEngineeringTokyoInstituteofTechnology4259-G1-5NagatsutaMidori-kuYokohama226-8502Japan DepartmentofChemicalandBiomolecularEngineering YonseiUniversitySeoul120-749RepublicofKorea

Using density functional theory （DFT） calculations, we rationally designed metallic nanocatalysts with ternary transition metals for oxygen reduction reactions （ORRs） in fuel cell applications. We surrounded binary core-shell nanoparticles with a Pt skin layer. To overcome surface segregation of the core 3-d transition metal, we identified the binary alloy Cu0.76Ni0.24 as having strongly attractive atomic interactions by computationally screening 158 different alloy configurations using energy convex hull theory. The PtskinCu0.76Ni0.24 nanoparticle showed better electrochemical stability than pure Pt nanoparticles -3 nm in size. We propose that the underlying mechanism originates from favorable compressive strain on Pt for ORR catalysis and atomic interactions among the nanoparticle shells for electrochemical stability. Our results will contribute to accurate identification and innovative design of promising nanomaterials for renewable energy systems.

关键词： density functional theory ternary alloy nanoparticle durability stability alloy

Thermally-triggered grain boundary relaxation in a nanograined Ni-Mo-W alloy

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Nano Research 2023年第11期16卷 12800-12808页

作者： Dongsong Zeng Jiongxian Li Yinong Shi Xiuyan Li Ke Lu Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

Conventionally,nanograined metals and alloys can be stabilized through segregating foreign elements at grain boundaries(GBs).Yet such an effect may be offset by formation of second phase at elevated *** this paper,by introducing minor W into a binary Ni-Mo alloy,we found precipitation of intermetallic phases was suppressed,enhancing thermal stability of the nanograined *** faceted GBs and a high-fraction ofΣ3 coincidence site lattice(CSL)boundaries illustrate that GB structures are relaxed by formation of copious annealing *** W reduces stacking fault energy of the solid solution and facilitates the thermally-triggered GB *** precipitation of the intermetallic phases may be attributed to depletion of solutes at relaxed GBs.

关键词： grain boundary relaxation nanograined ternary alloy thermal stability stacking fault energy

Phase diagram calculation and predication of Au–Pd–Zr ternary system

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Rare Metals 2017年第2期36卷 142-146页

作者： Jie Yu Lin-Jing Liu Shou-Dong Chen Jing-Chao Chen Faculty of Material Science and Engineering Kunming University of Science and Technology Mechanical Engineering and Automation Department Hunan Biological and Electromechanical Polytechnic

Au-Pd-Zr ternary alloy phase diagram at 25℃ was calculated by Panda phase calculation software,and the thermodynamic data were based on three binary alloy phase diagrams：Pd-Au,Au-Zr,and *** composition points in the ternary phase diagram were selected to predict the precipitation ***（32Au-32Pd-36Zr） of the five composition points in ternary phase diagram was chosen to verify the correctness of the phase diagram calculation and the precipitation order by scanning electron microscopy（SEM）,energy dispersive spectroscopy（EDS）,and X-ray diffraction（XRD）.The unknown phase in XRD patterns was predicated by EDS and materials studio（MS） *** experimental results show that there are seven key ternary reactions points and 17 phase regions in all isothermal sections at 25℃.The thermodynamic process and microstructure for the alloy phase can be described in order according to the vertical section in phase *** phase compositions of the chosen one point are consistent with calculation *** unknown phase in XRD patterns should be Zr_2AuPd by the first principle X-ray simulation.

关键词： Calculated phase diagram ternary alloy Thermodynamic Phase transformation Annealing

High temperature scaling of Ni-15Cu-5Al alloy in 1×10^5 Pa pure oxygen

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Journal of Central South University of Technology 2004年第4期11卷 348-352页

作者：向军淮牛焱吴维 State Key Laboratory for Corrosion and Protection Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Department of Applied Physics Jiangxi Science and Technology Normal University Nanchang 330013 China

The oxidation of the ternary alloy Ni-15Cu-5Al in 1 × 105 Pa pure oxygen at 700 ℃ and 800 ℃ was studied. The results show that the behavior of the Ni-rich alloy is similar to that of the binary Ni-Al alloy with the same Al content in the form of an external NiO layer coupled to the internal oxidation of aluminium. The presence of 15%(mole fraction) Cu cannot modify substantially the values of relevant parameters affecting the transition from the internal to the external oxidation of aluminium. The presence of 5 % Al reduces the oxidation rate of the corresponding Ni-Cu alloy during the whole oxidation stages, though 5 % Al is still insufficient to form protective external alumina scales.

关键词： Ni-rich alloy high temperature oxidation ternary alloy

A high dispersed Pt_(0.35)Pd_(0.35)Co_(0.30)/C as superior catalyst for methanol and formic acid electro-oxidation

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Chinese Chemical Letters 2014年第6期25卷 907-911页

作者： Ying-Xia Wang Tie-Hong Chen Institute of New Catalytic Materials Science Key Laboratory of Advanced Energy Materials Chemistry(MOE)College of ChemistryCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Nankai University

Pt：Pd：Co ternary alloy nanoparticles were synthesized by sodium borohydride reduction under nitrogen, and were supported on carbon black as catalysts for methanol and formic acid electro-oxidation. Compared with Pt0.65C00.35/C, Pt/C, Pd0.65C00.35/C, and Pd/C catalyst, Pt0.35Pd0.35Co0.30/C exhibited relatively high durability and strong poisoning resistance, and the Pt-mass activity was 3.6 times higher than that of Pt/C in methanol oxidation reaction. Meanwhile, the Pt0.35Pd0.35Co0.30/C exhibited excellent activity with higher current density and higher CO tolerance than that of Pt0.6sCo0.35/C, Pt/C, Pd0.65C00.35/ C, and Pd/C in formic acid electro-oxidation.

关键词： Fuel cell ternary alloy Formic acid oxidation Methanol electro-oxidation

Facile integration of an Al-rich Al_(1-x)In_(x)N photodetector on free-standing GaN by radio-frequency magnetron sputtering

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Chinese Physics B 2023年第11期32卷 591-597页

作者：刘新科林之晨林钰恒陈建金邹苹周杰李博沈龙海朱德亮刘强俞文杰黎晓华顾泓王新中黄双武 College of Materials Science and Engineering Institute of Microelectronics(IME)Guangdong Research Center for Interfacial Engineering of Functional MaterialsShenzhen UniversityShenzhen 518060China School of Science Shenyang Ligong UniversityShenyang 110159China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Gusu Laboratory of Materials Science Suzhou 215123China Information Technology Research Institute Shenzhen Institute of Information TechnologyShenzhen 518172China

Al_(1-x)In_(x)N, a Ⅲ-nitride semiconductor material, is currently of great research interest due to its remarkable physical properties and chemical stability. When the Al and In compositions are tuned, its band-gap energy varies from 0.7 eV to 6.2 eV, which shows great potential for application in photodetectors. Here, we report the fabrication and performance evaluation of integrated Al_(1-x)In_(x)N on a free-standing GaN substrate through direct radio-frequency magnetron *** optical properties of Al_(1-x)In_(x)N will be enhanced by the polarization effect of a heterostructure composed of Al_(1-x)In_(x)N and other Ⅲ-nitride materials. An Al_(1-x)In_(x)N/Ga N visible-light photodetector was prepared by semiconductor fabrication technologies such as lithography and metal deposition. The highest photoresponsivity achieved was 1.52 A·W^(-1)under 365 nm wavelength illumination and the photodetector was determined to have the composition Al0.75In0.25N/GaN.A rise time of 0.55 s was observed after transient analysis of the device. The prepared Al_(1-x)In_(x)N visible-light photodetector had a low dark current, high photoresponsivity and fast response speed. By promoting a low-cost, simple fabrication method,this study expands the application of ternary alloy Al_(1-x)In_(x)N visible-light photodetectors in optical communication.

关键词： Ali-xIn N photodetector GaN radio-frequency magnetron sputtering ternary alloy