活性炭纤维网状体负载金属硫化物及其电化学性能
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摘要
采用水热法在活性炭纤维网状体(Carbon network,CNW)表面分别负载NiS_2、CoS和NiCo_2S_4。通过X射线衍射仪、场发射式扫描电子显微镜对复合体系进行结构表征,结果表明:NiCo_2S_4呈现纳米棒状,单根纳米棒的长度约为800 nm,直径约为50 nm。电化学性能测试结果显示:相较于CNW/NiS_2和CNW/CoS,CNW/NiCo_2S_4复合电极表现出更为优越的电化学性能,其比电容达到994.2 F/g(电流密度为5 mA/cm~2)。经1000次充放电循环后仍保持87.4%的电容。
NiS_2, CoS and NiCo_2S_4 were loaded on carbon network(CNW) by hydrothermal method. The composite system was characterized by X-ray diffractometer and field emission scanning electron microscopy. The results showed that NiCo_2S_4 exhibited nanorod shape. The length of a single nanorod was about 800 nm and the diameter was about 50 nm. The electrochemical performance test results showed that the CNW/NiCo_2S_4 composite electrode exhibited superior electrochemical performance, compared with CNW/NiS_2 and CNW/CoS, and its specific capacitance reached 994.2 F/g(current density was 5 mA/cm~2). The retention rate of specific capacitance was 87.4% after cycling for 1000 times.
NiS_2, CoS and NiCo_2S_4 were loaded on carbon network(CNW) by hydrothermal method. The composite system was characterized by X-ray diffractometer and field emission scanning electron microscopy. The results showed that NiCo_2S_4 exhibited nanorod shape. The length of a single nanorod was about 800 nm and the diameter was about 50 nm. The electrochemical performance test results showed that the CNW/NiCo_2S_4 composite electrode exhibited superior electrochemical performance, compared with CNW/NiS_2 and CNW/CoS, and its specific capacitance reached 994.2 F/g(current density was 5 mA/cm~2). The retention rate of specific capacitance was 87.4% after cycling for 1000 times.
引文
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[2] Ma L,Liu R,Niu H,et al.Flexible and freestanding electrode based on polypyrrole/graphene/bacterial cellulose paper for supercapacitor[J].Composites Science & Technology,2016,137:87-93.
[3] Wang G,Zhang L,Zhang J.A review of electrode materials for electrochemical supercapacitors[J].Chemical Society Reviews,2012,41(2):797-828.
[4] 宋世姣.玉米皮基多孔碳材料的制备及超级电容器性能研究[D].哈尔滨:黑龙江大学,2017:1-8.
[5] 周新民,孙晖.新型储能元件综述:超级电容及其应用[J].变频器世界,2009(6):28-30.
[6] Kena Chen.Graphene-based materials for flexible energy storage devices[J].Energy Chemistry,2018,27(1):12-24.
[7] Kim J,Kim F,Huang J.Seeing graphene-based sheets[J].Materials Today,2010,13(3):28-38.
[8] Kaempgen M,Chan C K,Ma J,et al.Printable Thin Film supercapacitors using single-walled carbon nanotubes[J].Nano Letters,2015,9(5):1872.
[9] K?tz R,Carlen M.Principles and applications of electrochemical capacitors[J].Electrochimica Acta,2000,45(15):2483-2498.
[10] Li X,Zheng F,Zhou D F,Luo Y M,et al.Stable RuO2-based ternary composite electrode of sandwiched for electrochemical capacitors[J].Electrochimica Acta,2018,289(11):292-310
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[12] Lee H,Mi S C,Kim I H,et al.RuOx/polypyrrole nanocomposite electrode for electrochemical capacitors[J].Synthetic Metals,2010,160(9):1055-1059.
[13] Jiang H,Sun T,Li C,et al.Hierarchical porous nanostructures assembled from ultrathin MnO2 nanoflakes with enhanced supercapacitive performances[J].Journal of Materials Chemistry,2012,22(6):2751-2756.
[14] Yuan C,Zhang X,Su L,et al.Facile synthesis and self-assembly of hierarchical porous NiO nano/micro spherical superstructures for high performance supercapacitors[J].Journal of Materials Chemistry,2009,19(32):5772-5777.
[15] Du W,Liu R,Jiang Y,et al.Facile synthesis of hollow Co3O4,boxes for high capacity supercapacitor[J].Journal of Power Sources,2013,227(4):101-105.
[16] Moosavifard S E,El-Kady M F,Rahmanifar M S,et al.Designing 3D highly ordered nanoporous CuO electrodes for high-performance asymmetric supercapacitors.[J].Acs Applied Materials & Interfaces,2015,7(8):4851-4860
[17]Zhao J,Guan B,Hu B,et al.Vulcanizing time controlled synthesis of NiS microflowers and its application in asymmetric supercapacitors[J].Electrochimica Acta,2017,230:428-437.
[18] Yang J,Duan X,Qin Q,et al.Solvothermal synthesis of hierarchical flower-like b-NiS with excellent electrochemical performance for supercapacitors[J].Journal of Materials Chemistry A,2013,1(27):7880-7884.
[19] Li N,Liu X,Li G D,et al.Vertically grown CoS nanosheets on carbon cloth as efficient hydrogen evolution electrocatalysts[J].International Journal of Hydrogen Energy,2017,42(15):9914-9921.
[20] Zhou L,Zhang K,Sheng J,et al.Structural and chemical synergistic effect of CoS nanoparticles and porous carbon nanorods for high-performance sodium storage[J].Nano Energy,2017,35(2):281-289.
[21] Xu J,Zhang L,Xu G,et al.Facile synthesis of NiS2 anchored carbon nanofibers for high-performance supercapacitors[J].Applied Surface Science,2018,434:112-119.
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[24] Liu X,Wu Z.Hierarchitectures of mesoporous flowerlike NiCo2S4,with excellent pseudocapacitive properties[J].Materials Letters,2017,187:24-27.
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[29] Levi M D,Levi E A,Aurbach D.The mechanism of lithium intercalation in graphite film electrodes in aprotic media.Part 2.Potentiostatic intermittent titration and in situ XRD studies of the solid-state ionic diffusion[J].Journal of Electroanalytical Chemistry,1997,421(1/2):89-97.
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