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Induced phase transition of BECs in optical lattices by impurity

science china(physics,Mechanics & Astronomy) 2010年第3期53卷 469-473页

作者： tian dongping1,2 & liu xuanzuo1 1institute of condensed matter physics, school of science, xi’an jiaotong university, xi’an 710049, china 2xi’an university of Architecture and Technology, xi’an 710055, china xi’an jiaotong university Institute of Condensed Matter Physics School of Science Xi’an China (GRID:grid.43169.39) (ISNI:***) xi’an university of Architecture and Technology Xi’an China (GRID:grid.440704.3) (ISNI:***) xi’an jiaotong university Institute of Condensed Matter Physics School of Science Xi’an China (GRID:grid.43169.39) (ISNI:***)

In this work, the influence of imparity on BECs in optical lattices is investigated, and the possibility of MI-SF transition induced by impurity is verified. After the numerical calculation, the schematic phase diagram is discussed with an emphasis on the role of impurity. When n10 = n20, the phase boundaries coincide with each other; when n10 20 and U12 10 20 and U12 > 0, the phase boundaries may or may not intersect, depending on the values of U12, n10 and n20.

关键词： BECs Green function MI-SF transition

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Direct integration of ultralow-platinum alloy into nanocarbon architectures for efficient oxygen reduction in fuel cells

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science Bulletin 2021年第21期66卷 2207-2216,M0004页

作者： Shahid Zaman xinlong tian Ya-Qiong Su Weiwei Cai Ya Yan Ruijuan Qi Abdoulkader Ibro Douka Shenghua Chen Bo You Hongfang liu Shujiang Ding xingpeng Guo Bao Yu xia school of Chemistry and Chemical Engineering Key Laboratory of Material Chemistry for Energy Conversion and Storage(Ministry of Education)Hubei Key Laboratory of Material Chemistry and Service FailureHubei Engineering Research Center for Biomaterials and Medical Protective MaterialsWuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology(HUST)Wuhan 430074China school of Chemistry Xi'an Key Laboratory of Sustainable Energy Materials ChemistryMinistry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterState Key Laboratory of Electrical Insulation and Power EquipmentXi'an Jiaotong UniversityXi'an 710049China Sustainable Energy Laboratory Faculty of Material Science and ChemistryChina University of GeosciencesWuhan 430074China school of Materials science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Information science and Technology East China Normal UniversityShanghai 200240China

Developing efficient platinum(Pt)-based electrocatalysts is enormously significant for fuel ***,we report an integrated electrocatalyst of ultralow-Pt alloy encapsulated into nitrogen-doped nanocarbon architecture for efficient oxygen reduction *** hybrid Pt-based catalyst achieves a mass activity of 3.46 A mg^(-1)_(pt)the potential of 0.9 V *** with a negligible stability decay after 10,000 *** importantly,this half-cell activity can be expressed at full cell level with a high Pt utilization of 10.22 W mg^(-1)_(Pt cathode)and remarkable durability after 30,000 cycles in *** and theoretical investigations reveal that a highly strained Pt structure with an optimal Pt-0 binding energy is induced by the incorporation of Co/Ni into Pt lattice,which would account for the improved reaction *** synergistic catalysis due to nitrogen-doped nanocarbon architecture and active Pt component is responsible for the enhanced catalytic ***,the strong metal-support interaction and optimized hydrophilic properties of nanocarbon matrix facilitate efficient mass transport and water *** work may provide significant insights in designing the low-Pt integrated electrocatalysts for fuel cells and beyond.

关键词： Fuel cells Oxygen reduction reaction Electrocatalyst Low-platinum alloy Nanocarbon

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铑修饰的铂镍纳米线用于高效乙醇氧化反应

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science china Materials 2023年第2期66卷 679-685页

作者：王谦朱润茜邓培林李静黄玮陈琦苏亚琼贾春满刘钟馨康振烨沈义俊田新龙 State Key Laboratory of Marine Resource Utilization in South china Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228China school of Chemistry Xi’an Key Laboratory of Sustainable Energy Materials ChemistryMOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterState Key Laboratory of Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710049China

直接乙醇燃料电池(DEFCs)被认为是最有前途的便携式电源设备之一.目前用于DEFCs的主流催化剂是Pt基或Pd基催化剂,然而它们不能有效地断裂C–C键,只能使乙醇部分氧化为CH_(3)CHO或CH_(3)COOH.此外,大多数贵金属催化剂容易被反应中间体CO... 详细信息

直接乙醇燃料电池(DEFCs)被认为是最有前途的便携式电源设备之一.目前用于DEFCs的主流催化剂是Pt基或Pd基催化剂,然而它们不能有效地断裂C–C键,只能使乙醇部分氧化为CH_(3)CHO或CH_(3)COOH.此外,大多数贵金属催化剂容易被反应中间体CO毒化,降低了催化剂的稳定性和寿命,这些因素都抑制了催化剂的实际应用.本文中,我们报道了一种用于乙醇氧化反应的具有不同Rh含量的超细三金属PtNiRh纳米线,Pt_(6)Ni_(2)Rh_(3)/C具有最优的催化活性(1.16 A mg_(Pt^(-1)))、抗CO中毒能力和稳定性.理论计算表明,在双金属PtNi中引入Rh,使得该催化剂具有良好的中间物吸附和C–C键断裂能力,有利于乙醇的完全氧化.

关键词：乙醇氧化完全氧化直接乙醇燃料电池贵金属催化剂 Pd基催化剂催化活性键断裂双金属

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