层状双氢氧化物(LDH)是一种典型的二维纳米材料,具有比表面积大、比容量高、电活性位点丰富等优点,在储能领域显示出巨大的潜力。但是,层状双氢氧化物的导电性较差,循环过程中的体积变化较大,从而使电极材料的循环稳定性和倍率性变差。以硝酸钴、硝酸铝等为起始原料,以磺化石墨烯为模板,通过水热法制备了石墨烯/层状双氢氧化物二元复合材料。采用X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)等手段对制备产物形貌进行表征,并对复合材料的电化学性能进行了初步探讨。结果表明:LDH电极的电化学性能得到了显著改善。在电流密度为2A/g时,石墨烯/LDHs复合材料的比电容为345.3F/g。在5000次循环后,没有明显的电容损耗。
As a typical 2D nanomaterial,layered double hydroxides (LDHs) has shown great potential in the energy storage system due to their large specific surface area,high specificy and capacitrich electroactive sites,etc.However,it has poor electrical conductivity and undergoes large volume change during cycling,which deteriorates the cycling stability and rate capability of the electrode material.Cobalt nitrate and aluminum nitrate were used as the starting material,and sulfonated graphene(RGO) as a template to prepare RGO/LDHs binary composite by hydrothermal method.The morphology of the prepared composite was characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM) and transmission electron microscopy (TEM).In addition,the electrochemical properties of the composite was studied.The results shown prominent improvement of electrochemical performance of LDH-based electrodes.For instance,the specific capacitance of RGO/LDHs composite was 345.3F/g at the current density of 2A/g.Moreover,there was no obvious capacitance loss after 5000 cycles.
[1] 傅深娜.石墨烯/层状双氢氧化物纳米复合材料在超级电容器中的应用研究[J].化工新型材料,2018,46(8):5-8.
[2] Lai H,Wu Q,Zhao J,et al.Mesostructured NiO/Ni composites for high-performance electrochemical energy storage[J].Energy & Environmental Science,2016,9(6):2053-2060.
[3] Ke Q,Wang J.Graphene-based materials for supercapacitor electrodes-a review[J].Journal of Materiomics,2016,2(1):37-54.
[4] Zhang Y,Huang Y,Chen H,et al.Composition and structure control of ultralight graphene foam for high-performance microwave absorption[J].Carbon,2016,105:438-447.
[5] Yang Z,Tian J,Yin Z,et al.Carbon nanotube-and graphene-based nanomaterials and applications in high-voltage supercapacitor:a review[J].Carbon,2019,141:467-480.
[6] Liu X,Zou S,Liu K,et al.Highly compressible three-dimensional graphene hydrogel for foldable all-solid-state supercapacitor[J].Journal of Power Sources,2018,384:214-222.
[7] 陈健.聚吡咯复合材料的制备及其石墨烯气凝胶的电化学性能研究[D].桂林:桂林理工大学,2017.
[8] 史鹏,三维多孔石墨烯/聚苯胺复合材料的制备及其电化学性能研究[D].沈阳:沈阳大学,2018.
[9] Bieri M,Treier M,Cai J,et al.Porous graphenes:two-dimensional polymer synthesis with atomic precision[J].Chemical Communications,2009,45(45):6919-6921.
[10] Kuilla T,Bhadra S,Yao D,et al.Recent advances in graphene based polymer composites[J].Progress in Polymer Science,2010,35(11):1350-1375.
[11] 王康,余爱梅,郑华均.超级电容器电极材料的研究发展[J].浙江化工,2010(4):18-22.
[12] 冯晴亮,石墨烯基纳米生物材料修饰电极和单层MoS2(1-x)Se2x合金的制备及电分析、催化应用研究[D].兰州:兰州大学,2016.
[13] Huang Z,Wang S,Wang J,et al.Exfoliation-restacking synthesis of coal-layered double hydroxide nanosheets/reduced graphene oxide composite for high performance supercapacitors[J].Electrochimica Acta,2015,152:117-125.
[14] Peng W J,Li H Q,Liu Y Y,et al.Effect of oxidation degree of graphene oxide on the eletro-chemical performance of CoAl-layered double hydroxide/graphene composites[J].Applied Materials Today,2017,7(8):201-211.
[15] 关磊,张力嫱,张宇航,等.三维多孔泡沫石墨烯的制备与应用研究进展[J].合成化学,2018,26(5):383-388.
[16] 徐丽,刘双宇,陈新,等.三维石墨烯电极材料在锂离子电池中的应用[J].智能电网,2017,5(1):95-96.
[17] Yu C,Yang J,Zhao C,et al.Nanohybrids from NiCoAl-LDH coupled with carbon for pseudocapacitors:understanding the role of nano-structured carbon[J].Nanoscale,2014,6(6):3097.
[18] Sharma P,Bhatti T S.A review on electrochemical double-layer capacitors[J].Energy Conversion & Management,2010,51(12):2901-2912.
[19] Shan D,Yang J,Liu W,et al.Biomass-derived three-dimensional honeycomb-like hierarchical structured carbon for ultrahigh energy density asymmetric supercapacitors[J].Journal of Materials Chemistry A,2016,4(35):13589-13602.
[20] Brousse T,Toupin M,BéLanger D.A hybrid activated carbon-manganese dioxide capacitor using a mild aqueous electrolyte[J].Journal of the Electrochemical Society,2004,151(4):A614-A622.
[21] Zhao L,Fan L Z,Zhou M Q,et al.Nitrogen-containing hydrothermal carbons with superior performance in supercapacitors[J].Advanced Materials,2010,22(45):5202-5206.
PDF
