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Volumn 4, Issue , 2014, Pages

CuO single crystal with exposed {001} facets-A highly efficient material for gas sensing and Li-ion battery applications

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EID: 84906814877     PISSN: None     EISSN: 20452322     Source Type: Journal    
DOI: 10.1038/srep05753     Document Type: Article
Times cited : (133)

References (54)
  • 1
    • 0035890440 scopus 로고    scopus 로고
    • Issues and challenges facing rechargeable lithium batteries
    • Tarascon, J. M. & Armand, M. Issues and Challenges Facing Rechargeable Lithium Batteries. Nature 414, 359-367 (2001).
    • (2001) Nature , vol.414 , pp. 359-367
    • Tarascon, J.M.1    Armand, M.2
  • 2
    • 49649105634 scopus 로고    scopus 로고
    • Nanomaterials for rechargeable lithium batteries
    • Bruce, P. G., Scrosati, B. & Tarascon, J. M. Nanomaterials for Rechargeable Lithium Batteries. Angew. Chem., Int. Ed. 47, 2930-2946 (2008).
    • (2008) Angew. Chem. Int. Ed. , vol.47 , pp. 2930-2946
    • Bruce, P.G.1    Scrosati, B.2    Tarascon, J.M.3
  • 3
    • 38949102073 scopus 로고    scopus 로고
    • Building better batteries
    • Armand, M. & Tarascon, J. M. Building better batteries. Nature 451, 652-657 (2008).
    • (2008) Nature , vol.451 , pp. 652-657
    • Armand, M.1    Tarascon, J.M.2
  • 4
    • 0037073941 scopus 로고    scopus 로고
    • Shape-controlled synthesis of gold and silver nanoparticles
    • Sun, Y. & Xia, Y. Shape-controlled synthesis of gold and silver nanoparticles. Science 298, 2176-2179 (2002).
    • (2002) Science , vol.298 , pp. 2176-2179
    • Sun, Y.1    Xia, Y.2
  • 5
    • 0037033988 scopus 로고    scopus 로고
    • Growth of nanowire superlattice structures for nanoscale photonics and electronics
    • Gudiksen, M. S. et al. Growth of nanowire superlattice structures for nanoscale photonics and electronics. Nature 415, 617 (2002).
    • (2002) Nature , vol.415 , pp. 617
    • Gudiksen, M.S.1
  • 6
    • 18044387790 scopus 로고    scopus 로고
    • Chemistry and properties of nanocrystals of different shapes
    • Burda, C. et al. Chemistry and properties of nanocrystals of different shapes. Chem. Rev. 105, 1025-1102 (2005).
    • (2005) Chem. Rev. , vol.105 , pp. 1025-1102
    • Burda, C.1
  • 7
    • 11044228428 scopus 로고    scopus 로고
    • Enhanced catalytic activity of ceria nanorods from well-defined reactive crystal planes
    • Zhou, K. B. et al. Enhanced catalytic activity of ceria nanorods from well-defined reactive crystal planes. J. Catal. 229, 206-212 (2005).
    • (2005) J. Catal. , vol.229 , pp. 206-212
    • Zhou, K.B.1
  • 8
    • 34248196976 scopus 로고    scopus 로고
    • Synthesis of tetrahexahedral platinum nanocrystals with high-index facets and high electro-oxidation activity
    • Tian, N. et al. Synthesis of tetrahexahedral platinum nanocrystals with high-index facets and high electro-oxidation activity. Science 316, 732-735 (2007).
    • (2007) Science , vol.316 , pp. 732-735
    • Tian, N.1
  • 9
    • 51049097538 scopus 로고    scopus 로고
    • Shape and crystal-plane effects of nanoscale ceria on the activity of Au-CeO2 catalysts for the water-gas shift reaction
    • Si, R. & Flytzani-Stephanopoulos, M. Shape and Crystal-Plane Effects of Nanoscale Ceria on the Activity of Au-CeO2 Catalysts for the Water-Gas Shift Reaction. Angew. Chem., Int. Ed. 47, 2884 (2008).
    • (2008) Angew. Chem. Int. Ed. , vol.47 , pp. 2884
    • Si, R.1    Flytzani-Stephanopoulos, M.2
  • 10
    • 77951694910 scopus 로고    scopus 로고
    • Constructing hierarchical spheres from large ultrathin anatase TiO2 nanosheets with nearly 100% exposed (001) facets for fast reversible lithium storage
    • Chen, J. S. et al. Constructing hierarchical spheres from large ultrathin anatase TiO2 nanosheets with nearly 100% exposed (001) facets for fast reversible lithium storage. J. Am. Chem. Soc. 132, 6124-6130 (2010).
    • (2010) J. Am. Chem. Soc. , vol.132 , pp. 6124-6130
    • Chen, J.S.1
  • 11
    • 44449091492 scopus 로고    scopus 로고
    • Anatase TiO2 single crystals with a large percentage of reactive facets
    • Yang, H. G. et al. Anatase TiO2 single crystals with a large percentage of reactive facets. Nature 453, 638-642 (2008).
    • (2008) Nature , vol.453 , pp. 638-642
    • Yang, H.G.1
  • 12
    • 70349113134 scopus 로고    scopus 로고
    • Titania-based photocatalysts-crystal growth, doping and heterostructuring
    • Liu, G. et al. Titania-based photocatalysts-crystal growth, doping and heterostructuring. J. Am. Chem. Soc. 131, 12868-12869 (2009).
    • (2009) J. Am. Chem. Soc. , vol.131 , pp. 12868-12869
    • Liu, G.1
  • 13
    • 67749142099 scopus 로고    scopus 로고
    • Solvothermal synthesis and photoreactivity of anatase TiO2 nanosheets with dominant {001} facets
    • Yang, H. G. et al. Solvothermal synthesis and photoreactivity of anatase TiO2 nanosheets with dominant {001} facets. J. Am. Chem. Soc. 131, 4078-4083 (2009).
    • (2009) J. Am. Chem. Soc. , vol.131 , pp. 4078-4083
    • Yang, H.G.1
  • 14
    • 77956093928 scopus 로고    scopus 로고
    • Tunable photocatalytic selectivity of hollow TiO2 microspheres composed of anatase polyhedra with exposed {001} facets
    • Liu, S. W., Yu, J. G. & Jaroniec, M. Tunable photocatalytic selectivity of hollow TiO2 microspheres composed of anatase polyhedra with exposed {001} facets. J. Am. Chem. Soc. 132, 11914-11916 (2010).
    • (2010) J. Am. Chem. Soc. , vol.132 , pp. 11914-11916
    • Liu, S.W.1    Yu, J.G.2    Jaroniec, M.3
  • 15
    • 27744597143 scopus 로고    scopus 로고
    • Reactivity of anatase TiO2 nanoparticles: The role of the minority (001) surface
    • Gong, X. Q. & Selloni, A. Reactivity of anatase TiO2 nanoparticles: the role of the minority (001) surface. J. Phys. Chem. B 109, 19560-19562 (2005).
    • (2005) J. Phys. Chem. B , vol.109 , pp. 19560-19562
    • Gong, X.Q.1    Selloni, A.2
  • 16
    • 33644624068 scopus 로고    scopus 로고
    • Nearly monodisperse Cu2O and CuO nanospheres: Preparation and applications for sensitive gas sensors
    • Zhang, J. et al. Nearly monodisperse Cu2O and CuO nanospheres: preparation and applications for sensitive gas sensors. Chem. Mater. 18, 867-871 (2006).
    • (2006) Chem. Mater. , vol.18 , pp. 867-871
    • Zhang, J.1
  • 17
    • 34547163805 scopus 로고    scopus 로고
    • Efficient CuO-nanoparticle-catalyzed C-S cross-coupling of thiols with iodobenzene
    • Rout, L., Sen, T. K. & Punniyamurthy, T. Efficient CuO-Nanoparticle-Catalyzed C-S Cross-Coupling of Thiols with Iodobenzene. Angew. Chem., Int. Ed. 46, 5583-5586 (2007).
    • (2007) Angew. Chem. Int. Ed. , vol.46 , pp. 5583-5586
    • Rout, L.1    Sen, T.K.2    Punniyamurthy, T.3
  • 18
    • 0034727086 scopus 로고    scopus 로고
    • Nano-sized transition-metal oxides as negative-electrode materials for lithium-ion batteries
    • Poizot, P. et al.Nano-sized transition-metal oxides as negative-electrode materials for lithium-ion batteries. Nature 407, 496-499 (2000).
    • (2000) Nature , vol.407 , pp. 496-499
    • Poizot, P.1
  • 19
    • 84891625827 scopus 로고    scopus 로고
    • Preparation and characterization of CuO nanostructures on copper substrate as selective solar absorbers
    • Karthick Kumar, S., Murugesan, S. & Suresh, S. Preparation and characterization of CuO nanostructures on copper substrate as selective solar absorbers. Mater. Chem. Phys. 143, 1209-1214 (2014).
    • (2014) Mater. Chem. Phys. , vol.143 , pp. 1209-1214
    • Karthick Kumar, S.1    Murugesan, S.2    Suresh, S.3
  • 20
    • 84887900018 scopus 로고    scopus 로고
    • Nano-structured Carbon-coated CuO Hollow Spheres as Stable and High Rate Anodes for Lithium-ion Batteries
    • Xu, Y. et al. Nano-structured Carbon-coated CuO Hollow Spheres as Stable and High Rate Anodes for Lithium-ion Batteries. J. Mater. Chem. A 1, 15486-15490 (2013).
    • (2013) J. Mater. Chem. A , vol.1 , pp. 15486-15490
    • Xu, Y.1
  • 21
    • 0001655688 scopus 로고
    • Far-infrared spectroscopic investigations on CuO
    • Kliche, G. & Popovic, Z. V. Far-infrared spectroscopic investigations on CuO. Phys. Rev. B 42, 10060-10066 (1990).
    • (1990) Phys. Rev. B , vol.42 , pp. 10060-10066
    • Kliche, G.1    Popovic, Z.V.2
  • 22
    • 59749092416 scopus 로고    scopus 로고
    • Observation of superspin-glass behavior in Fe3O4 nanoparticles
    • Suzuki, M. et al. Observation of superspin-glass behavior in Fe3O4 nanoparticles. Phys. Rev. B 79, 024418 (2009).
    • (2009) Phys. Rev. B , vol.79 , pp. 024418
    • Suzuki, M.1
  • 23
    • 77950917663 scopus 로고    scopus 로고
    • Fe3O4 submicron spheroids as anode materials for lithium-ion batteries with stable and high electrochemical performance
    • Wang, S. Q., Zhang, J. Y. & Chen, C. H. Fe3O4 submicron spheroids as anode materials for lithium-ion batteries with stable and high electrochemical performance. J. Power Sources 195, 5379-5381 (2010).
    • (2010) J. Power Sources , vol.195 , pp. 5379-5381
    • Wang, S.Q.1    Zhang, J.Y.2    Chen, C.H.3
  • 24
    • 70549104829 scopus 로고    scopus 로고
    • Structure and electrochemical performance of nanostructured Fe3O4/carbon nanotube composites as anodes for lithium ion batteries
    • He, Y. et al. Structure and electrochemical performance of nanostructured Fe3O4/carbon nanotube composites as anodes for lithium ion batteries. Electrochimica. Acta 55, 1140-1144 (2010).
    • (2010) Electrochimica. Acta , vol.55 , pp. 1140-1144
    • He, Y.1
  • 25
    • 34250732235 scopus 로고    scopus 로고
    • In situ and operando spectroscopy for assessing mechanisms of gas sensing
    • Gurlo, A. & Riedel, R. In situ and operando spectroscopy for assessing mechanisms of gas sensing. Angew. Chem., Int. Ed. 46, 3826-3848 (2007).
    • (2007) Angew. Chem., Int. Ed. , vol.46 , pp. 3826-3848
    • Gurlo, A.1    Riedel, R.2
  • 26
    • 0012259922 scopus 로고    scopus 로고
    • Photochemical sensing of NO2 with SnO2 nanoribbon nanosensors at room temperature. Angew. Chem
    • Law, M. et al. Photochemical sensing of NO2 with SnO2 nanoribbon nanosensors at room temperature. Angew. Chem., Int. Ed. 114, 2511-2514 (2002).
    • (2002) Int. Ed. , vol.114 , pp. 2511-2514
    • Law, M.1
  • 27
    • 33644624068 scopus 로고    scopus 로고
    • Nearly monodisperse Cu2O and CuO nanospheres: Preparation and applications for sensitive gas sensors
    • Zhang, J. et al. Nearly monodisperse Cu2O and CuO nanospheres: preparation and applications for sensitive gas sensors. Chem. Mater. 18, 867-871 (2006).
    • (2006) Chem. Mater. , vol.18 , pp. 867-871
    • Zhang, J.1
  • 29
    • 80052968368 scopus 로고    scopus 로고
    • Co3O4 nanowires as high capacity anode materials for lithium ion batteries
    • Wang, F. et al. Co3O4 nanowires as high capacity anode materials for lithium ion batteries. J. Alloys Compd. 509, 9798-9803 (2011).
    • (2011) J. Alloys Compd. , vol.509 , pp. 9798-9803
    • Wang, F.1
  • 30
    • 0000654924 scopus 로고    scopus 로고
    • A transmission electron microscopy study of the reactivity mechanism of tailor-made CuO particles toward lithium
    • Debart, A. et al. A transmission electron microscopy study of the reactivity mechanism of tailor-made CuO particles toward lithium. J. Electrochem. Soc. 148, A1266-A1274 (2001).
    • (2001) J. Electrochem. Soc. , vol.148
    • Debart, A.1
  • 31
    • 67649205095 scopus 로고    scopus 로고
    • One-step fabrication of CuO nanoribbons array electrode and its excellent lithium storage performance
    • Ke, F. S. et al. One-step fabrication of CuO nanoribbons array electrode and its excellent lithium storage performance. Electrochim. Acta 54, 5825-5829 (2009).
    • (2009) Electrochim. Acta , vol.54 , pp. 5825-5829
    • Ke, F.S.1
  • 32
    • 0036572026 scopus 로고    scopus 로고
    • On the Origin of the extra electrochemical capacity displayed by MO/Li cells at low potential
    • Laruelle, S. et al.On the Origin of the Extra Electrochemical Capacity Displayed by MO/Li Cells at Low Potential. J. Electrochem. Soc. 149, A627-A634 (2002).
    • (2002) J. Electrochem. Soc. , vol.149
    • Laruelle, S.1
  • 33
    • 25444454576 scopus 로고    scopus 로고
    • Cu nanoparticles derived from CuO electrodes in lithium cells
    • Zhang, D. W., Yi, T. H. & Chen, C. H. Cu nanoparticles derived from CuO electrodes in lithium cells. Nanotechnology 16, 2338 (2005).
    • (2005) Nanotechnology , vol.16 , pp. 2338
    • Zhang, D.W.1    Yi, T.H.2    Chen, C.H.3
  • 34
    • 0041878960 scopus 로고    scopus 로고
    • Reversiblehomogeneous and heterogeneous li storage in ruo2 with high capacity
    • Balaya, P., Li, H., Kienle, L. &Maier, J. ReversibleHomogeneous and Heterogeneous Li Storage in RuO2 with High Capacity. Adv. Funct. Mater. 13, 621-625 (2003).
    • (2003) Adv. Funct. Mater. , vol.13 , pp. 621-625
    • Balaya, P.1    Li, H.2    Kienle, L.3    Maier, J.4
  • 35
    • 29444437534 scopus 로고    scopus 로고
    • Nanoionics: Ion transport and electrochemical storage in confined systems
    • Maier, J. Nanoionics: ion transport and electrochemical storage in confined systems. Nat. Mater. 4, 805-815 (2005).
    • (2005) Nat. Mater. , vol.4 , pp. 805-815
    • Maier, J.1
  • 36
    • 0000654924 scopus 로고    scopus 로고
    • A transmission electron microscopy study of the reactivity mechanism of tailor-made CuO particles toward lithium
    • Dèbart, A. et al. A transmission electron microscopy study of the reactivity mechanism of tailor-made CuO particles toward lithium. J. Electrochem. Soc. 148, A1266-A1274 (2001).
    • (2001) J. Electrochem. Soc. , vol.148
    • Dèbart, A.1
  • 37
    • 79952665067 scopus 로고    scopus 로고
    • Electrochemical impedance analysis of a hierarchical CuO electrode composed of self-assembled nanoplates
    • Xiang, J. Y. et al. Electrochemical impedance analysis of a hierarchical CuO electrode composed of self-assembled nanoplates. J. Phys. Chem. C 115, 2505-2513 (2011).
    • (2011) J. Phys. Chem. C , vol.115 , pp. 2505-2513
    • Xiang, J.Y.1
  • 38
    • 84860382413 scopus 로고    scopus 로고
    • Sponge-like porous carbon/tin composite anode materials for lithium ion batteries
    • Xu, Y. H., Guo, J. C. & Wang, C. S. Sponge-like porous carbon/tin composite anode materials for lithium ion batteries. J. Mater. Chem. 22, 9562-9567 (2012).
    • (2012) J. Mater. Chem. , vol.22 , pp. 9562-9567
    • Xu, Y.H.1    Guo, J.C.2    Wang, C.S.3
  • 39
    • 77953134905 scopus 로고    scopus 로고
    • Solvent-assisted molten salt process: A new route to synthesise a-Fe2O3/C nanocomposite and its electrochemical performance in lithium-ion batteries
    • Hassan, M. F. et al. Solvent-assisted molten salt process: A new route to synthesise a-Fe2O3/C nanocomposite and its electrochemical performance in lithium-ion batteries. Electrochim. Acta 55, 5006-5013 (2010).
    • (2010) Electrochim. Acta , vol.55 , pp. 5006-5013
    • Hassan, M.F.1
  • 40
    • 0042672794 scopus 로고    scopus 로고
    • An update on the reactivity of nanoparticles Co-based compounds towards Li
    • Grugeon, S. et al. An update on the reactivity of nanoparticles Co-based compounds towards Li. Solid State Sci. 5, 895-904 (2003).
    • (2003) Solid State Sci. , vol.5 , pp. 895-904
    • Grugeon, S.1
  • 41
    • 84897861435 scopus 로고    scopus 로고
    • Copper Oxide Hierarchical Microspheres Grown on Copper Foil and Their Enhanced Performance as Anodes for Li-ion Batteries
    • Jin, S., Zhu, X. & Qian, Y. Copper Oxide Hierarchical Microspheres Grown on Copper Foil and Their Enhanced Performance as Anodes for Li-ion Batteries. Int. J. Electrochem. Sci. 9, 2859-2866 (2014).
    • (2014) Int. J. Electrochem. Sci. , vol.9 , pp. 2859-2866
    • Jin, S.1    Zhu, X.2    Qian, Y.3
  • 42
    • 84886768609 scopus 로고    scopus 로고
    • Direct observation of important morphology and composition changes at the surface of the CuO conversion material in lithium batteries
    • Martin, L. et al. Direct observation of important morphology and composition changes at the surface of the CuO conversion material in lithium batteries. J. Power Sources 248, 861-873(2014).
    • (2014) J. Power Sources , vol.248 , pp. 861-873
    • Martin, L.1
  • 43
    • 43249123729 scopus 로고    scopus 로고
    • Preparation of nanowire arrays of amorphous carbon nanotubecoated single crystal SnO2
    • Zhao, N. H. et al. Preparation of nanowire arrays of amorphous carbon nanotubecoated single crystal SnO2. Chem. Mater. 20, 2612-2614 (2008).
    • (2008) Chem. Mater. , vol.20 , pp. 2612-2614
    • Zhao, N.H.1
  • 44
    • 84878217404 scopus 로고    scopus 로고
    • Size controlled CuO nanoparticles for Li-ion batteries
    • Waser, O. et al. Size controlled CuO nanoparticles for Li-ion batteries. J. Power Sources 241, 415-422 (2013).
    • (2013) J. Power Sources , vol.241 , pp. 415-422
    • Waser, O.1
  • 45
    • 84896496529 scopus 로고    scopus 로고
    • Preparation of octahedral CuO micro/nanocrystals and electrochemical performance as anode for lithium-ion battery
    • Feng, L. et al. Preparation of octahedral CuO micro/nanocrystals and electrochemical performance as anode for lithium-ion battery. J. Alloys Compd. 600, 162-167 (2014).
    • (2014) J. Alloys Compd. , vol.600 , pp. 162-167
    • Feng, L.1
  • 46
    • 0037137683 scopus 로고    scopus 로고
    • Role of crystalline defects in electrocatalysis: Mechanism and kinetics of CO adlayer oxidation on stepped platinum electrodes
    • Lebedeva, N. P., Koper, M. T. M., Feliu, J. M. & Van Santen, R. A. Role of crystalline defects in electrocatalysis: Mechanism and kinetics of CO adlayer oxidation on stepped platinum electrodes. J. Phys. Chem. B 106, 12938-12947 (2002).
    • (2002) J. Phys. Chem. B , vol.106 , pp. 12938-12947
    • Lebedeva, N.P.1    Koper, M.T.M.2    Feliu, J.M.3    Van Santen, R.A.4
  • 47
    • 84863233756 scopus 로고    scopus 로고
    • Microwave-induced synthesis of porous single-crystal-like TiO2 with excellent lithium storage properties
    • Zhang, D. Q. et al. Microwave-induced synthesis of porous single-crystal-like TiO2 with excellent lithium storage properties. Langmuir 28, 4543-4547 (2012).
    • (2012) Langmuir , vol.28 , pp. 4543-4547
    • Zhang, D.Q.1
  • 48
    • 79953214610 scopus 로고    scopus 로고
    • Carbon-supported ultra-thin anatase TiO2 nanosheets for fast reversible lithium storage
    • Chen, J. S., Liu, H., Qiao, S. Z. & Lou, X. W. Carbon-supported ultra-thin anatase TiO2 nanosheets for fast reversible lithium storage. J. Mater. Chem. 21, 5687-5692 (2011).
    • (2011) J. Mater. Chem. , vol.21 , pp. 5687-5692
    • Chen, J.S.1    Liu, H.2    Qiao, S.Z.3    Lou, X.W.4
  • 49
    • 33745130389 scopus 로고    scopus 로고
    • High lithium electroactivity of nanometer-sized rutile tio2
    • Hu, Y. S., Kienle, L., Guo, Y. G. & Maier, J. High Lithium Electroactivity of Nanometer-Sized Rutile TiO2. Adv. Mater. 18, 1421-1426 (2006).
    • (2006) Adv. Mater. , vol.18 , pp. 1421-1426
    • Hu, Y.S.1    Kienle, L.2    Guo, Y.G.3    Maier, J.4
  • 50
    • 0001437693 scopus 로고
    • Band theory and Mott insulators: Hubbard U instead of Stoner i
    • Anisimov, V. I., Zaanen, J. & Andersen, O. K. Band theory and Mott insulators: Hubbard U instead of Stoner I. Phys. Rev. B 44, 943 (1991).
    • (1991) Phys. Rev. B , vol.44 , pp. 943
    • Anisimov, V.I.1    Zaanen, J.2    Andersen, O.K.3
  • 51
    • 26144450583 scopus 로고
    • Self-interaction correction to density-functional approximations for many-electron systems
    • Perdew, J. P. & Zunger, A. Self-interaction correction to density-functional approximations for many-electron systems. Phys. Rev. B 23, 5048 (1981).
    • (1981) Phys. Rev. B , vol.23 , pp. 5048
    • Perdew, J.P.1    Zunger, A.2
  • 52
    • 20544463457 scopus 로고
    • Soft self-consistent pseudopotentials in a generalized eigenvalue formalism
    • Vanderbilt, D. Soft self-consistent pseudopotentials in a generalized eigenvalue formalism. Phys. Rev. B 41, 7892 (1990).
    • (1990) Phys. Rev. B , vol.41 , pp. 7892
    • Vanderbilt, D.1
  • 53
    • 33646343022 scopus 로고    scopus 로고
    • Oxidation energies of transition metal oxides within the GGA1 U framework
    • Wang, L., Maxisch, T. & Ceder, G. Oxidation energies of transition metal oxides within the GGA1 U framework. Phys. Rev. B 73, 195107 (2006).
    • (2006) Phys. Rev. B , vol.73 , pp. 195107
    • Wang, L.1    Maxisch, T.2    Ceder, G.3
  • 54
    • 30544440374 scopus 로고    scopus 로고
    • Highly ordered self-assembly with large area of Fe3O4 nanoparticles and the magnetic properties
    • Yang, T. et al.Highly ordered self-assembly with large area of Fe3O4 nanoparticles and the magnetic properties. J. Phys. Chem. B 109, 23233-23236 (2005).
    • (2005) J. Phys. Chem. B , vol.109 , pp. 23233-23236
    • Yang, T.1


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