分级结构的碳/二硫化钼纳米带的制备及其锂电性能研究
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摘要
以钼粉、过氧化氢(30%)、苹果酸、硫脲为原料,通过连续的水热法-热分解碳包覆,制备出了分级结构的C@MoS_2@C纳米带,并通过X射线衍射、扫描透射及电化学性能表征方法对该纳米复合材料的形貌结构、组成成分及锂电性能进行测试。研究结果表明,通过该连续的水热法-热分解碳包覆,以碳包覆的三氧化钼纳米带为模板,制备出分级结构的C@MoS_2纳米带复合材料,其MoS_2纳米片均匀的负载在碳层表面,通过再一次简单的热分解碳包覆,实现了在MoS_2表面均匀覆盖一层无定形碳,得到了三层分级结构的C@MoS_2@C纳米带复合材料。通过这种形貌结构的筑造,极大提高了其作为锂电负极材料的导电性、结构稳定性,该材料作为锂电负极材料在0.2 A/g的恒流充放电下循环100次后放电比容量达到1025.5m Ah/g,在1.0 A/g的大电流充放电循环中放电比容量仍然达到820 m Ah/g。
The thin films,comprising hierarchical C-coated MoS_2( C@MoS_2@C) nanobelts,were synthesized by continuous hydrothermal-decomposition with reactants of Mo-powder,H_2O_2( 30%),malic acid and thiourea. The microstructures and Li-ion storage behavior of the C@MoS_2@C nanobelts were investigated with X-ray diffraction,scanning electron microscopy,transmission electron microscopy and cyclic voltammetry. The results show that the C@MoS_2@C nanobelts with good Li-ion storage capacity can be synthesized by hydrothermal-decomposition. For example,when cycled for 100 times at 0. 2 A/g and 1. 0 A/g,the specific capacity of the rate-capacity of the C@MoS_2@C nanobelts was 1025. 5 and 820 m Ahg-1,respectively. The C-coated MoS_2 nanobelts can be synthesized by hydrothermal-decomposition decomposition of the C-coated MoO_3-precursor; while keeping the nano-structures intact,the Ccoating is capable of promoting MoS_2 nano-sheets formation on the surface of C-template,significantly increasing the MoS_2-conductivity. The as-synthesized C@MoS_2@C films possess high conductivity and structural stability.
The thin films,comprising hierarchical C-coated MoS_2( C@MoS_2@C) nanobelts,were synthesized by continuous hydrothermal-decomposition with reactants of Mo-powder,H_2O_2( 30%),malic acid and thiourea. The microstructures and Li-ion storage behavior of the C@MoS_2@C nanobelts were investigated with X-ray diffraction,scanning electron microscopy,transmission electron microscopy and cyclic voltammetry. The results show that the C@MoS_2@C nanobelts with good Li-ion storage capacity can be synthesized by hydrothermal-decomposition. For example,when cycled for 100 times at 0. 2 A/g and 1. 0 A/g,the specific capacity of the rate-capacity of the C@MoS_2@C nanobelts was 1025. 5 and 820 m Ahg-1,respectively. The C-coated MoS_2 nanobelts can be synthesized by hydrothermal-decomposition decomposition of the C-coated MoO_3-precursor; while keeping the nano-structures intact,the Ccoating is capable of promoting MoS_2 nano-sheets formation on the surface of C-template,significantly increasing the MoS_2-conductivity. The as-synthesized C@MoS_2@C films possess high conductivity and structural stability.
引文
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[22]Zhu H,Lyu F L,x Du F L,et al.Design of Two-Dimensional,Ultrathin Mo S2Nanoplates Fabricated Within One-Dimensional Carbon Nanofibers with Thermosensitive Morphology:High-Performance Electrocatalysts for The Hydrogen Evolution Reaction[J].ACS Applied Materials&Interfaces,2014,6(24):22126-22137
[2]Brousse T,Retoux R,Herterich U,et al.Thin-Film Crystalline Sn O2-Lithium Electrodes[J].Journal of the Electrochemical Society,1998,145(1):1-4
[3]Wang SQ,Zhang JY,Chen CH,Dandelion-like Hollow Microspheres of Cu O as Anode Material for Lithium-Ion Batteries[J].Scripta Materialia,2007,57(4):337-340
[4]Kim Jinyoung,Cho Jaephil.Rate Characteristics of Anatase Ti O2Nanotubes and Nanorods for Lithium Battery Anode Materials at Room Temperature[J].Journal of the Electrochemical Society,2007,154(6):A542-A546
[5]Huang X,Zeng Z,Zhang H.Metal Dichalcogenide Nanosheets:Preparation,Properties and Applications[J].Chemical Society Reviews,2013,42(5):1934-1946
[6]Tyler Stephenson,Zhi Li,Brian Olsen,et al.Lithium Ion Battery Applications of Molybdenum Disulfide(Mo S2)Nanocomposites[J].Energy Environ Sci,2014,7(1):209-231
[7]Zhang L,Lou X W.Hierarchical Mo S2Shells Supported on Carbon Spheres for Highly Reversible Lithium Storage[J].Chemistry-a European Journal,2014,20(18):5219-5223
[8]Zhang X,Xie Y.Recent Advances in Free-Standing TwoDimensional Crystals with Atomic Thickness:Design,Assembly and Transfer Strategies[J].Chemical Society Reviews,2013,42(21):8187-99
[9]Manish Chhowalla,Hyeon Suk Shin,Goki Eda,et al.The Chemistry of Two-Dimensional Layered Transition Metal Dichalcogenide Nanosheets[J].Nat Chem,2013,5(4):263-275
[10]Hwang H,Kim H,Cho J.Mo S2Nanoplates Consisting of Disordered Graphene-Like Layers for High Rate Lithium Battery Anode Materials[J].Nano Letters,2011,11(11):4826-4830
[11]Xiao Jie,Choi Daiwon,Cosimbescu Lelia,et al.Exfoliated Mo S2Nanocomposite as an Anode Material for Lithium Ion Batteries[J].Chemistry of Materials,2010,22(16):4522-4524
[12]Park Seung-Keun,Yu Seung-Ho,Woo Seunghee,et al.A Facile and Green Strategy for the Synthesis of Mo S2Nanospheres with Excellent Li-ion Storage Properties[J].Crystengcomm,2012,14(24):8323
[13]Chen G,Wang S P,Yi R,et al.Facile Synthesis of Hierarchical Mo S2-Carbon Microspheres as a Robust Anode for Lithium ion Batteries[J].Journal of Materials Chemistry A,2016,4(24):9653-9660
[14]Yu H L,Zhu C L,Zhang K,et al.Three-Dimensional Hierarchical Mo S2Nanoflake Array/Carbon Cloth as HighPerformance Flexible Lithium-Ion Battery Anodes[J].Journal of Materials Chemistry,2014,A2(13):4551-4557
[15]Zhao C Y,Kong J H,Yao X Y,et al.Thin Mo S2Nanoflakes Encapsulated in Carbon Nanofibers as High-Performance Anodes for Lithium-Ion Batteries[J].ACS Applied Materials&Interfaces,2014,6(9):6392-6398
[16]Yu X Y,Hu H,Wang Y W,et al.Ultrathin Mo S2Nanosheets Supported on N-doped Carbon Nanoboxes with Enhanced Lithium Storage and Electrocatalytic Properties[J].Angewandte Chemie-International Edition,2015,54(25):7395-7398
[17]Xiao Jie,Wang Xiaojian,Yang Xiao-Qing,et al.Electrochemically Induced High Capacity Displacement Reaction of PEO/1Mo S2/Graphene Nanocomposites with Lithium[J].Advanced Functional Materials,2011,21(15):2840-2846
[18]Wang S Q,Jiang X Y,Zheng H,et al.Solvothermal Synthesis of Mo S2/Carbon Nanotube Composites with Improved Electrochemical Performance for Lithium Ion Batteries[J].Nanoscience and Nanotechnology Letters,2012,4(4):378-383
[19]Hu S,Chen W,Uchaker E,et al.Mesoporous Carbon Nanofibers Embedded with Mo S2Nanocrystals for Extraordinary Li-Ion Storage[J].Chemistry-a European Journal,2015,21(50):18248-18257
[20]Xu X,Yu D M,Zhou H,et al.Mo S2Nanosheets Grown on Amorphous Carbon Nanotubes for Enhanced Sodium Storage[J].Journal of Materials Chemistry,2016,A4(12):4375-4379
[21]Chang K,Chen W,In Situ Synthesis of Mo S2/Graphene Nanosheet Composites with Extraordinarily Hhigh Electrochemical Performance for Lithium ion Batteries[J].Chem Commun(Camb),2011,47(14):4252-4254
[22]Zhu H,Lyu F L,x Du F L,et al.Design of Two-Dimensional,Ultrathin Mo S2Nanoplates Fabricated Within One-Dimensional Carbon Nanofibers with Thermosensitive Morphology:High-Performance Electrocatalysts for The Hydrogen Evolution Reaction[J].ACS Applied Materials&Interfaces,2014,6(24):22126-22137