Synthesis of shape-controlled NiO–graphene nanocomposites with enhanced supercapacitive properties
Synthesis of shape-controlled NiO–graphene nanocomposites with enhanced supercapacitive properties
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DOI：
10.1039/c5nj00040h
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发表时间：
2015-05
影响因子：
3.3
通讯作者：
Xiaomiao Feng;Jinhua Zhou;Linlin Wang;Yi Li;Zhen‐Dong Huang;Shufen Chen;Ma Yanwen;Lianjun Wang;Xiaohong Yan
中科院分区：
文献类型：
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作者：
Xiaomiao Feng;Jinhua Zhou;Linlin Wang;Yi Li;Zhen‐Dong Huang;Shufen Chen;Ma Yanwen;Lianjun Wang;Xiaohong Yan
采用水热法成功地合成了花状和多面体状NiO-石墨烯纳米复合材料。研究了两种不同形貌纳米复合材料的形成机理。采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）、热重分析（TG）和BET法对产物进行了表征。所制备的不同形貌的NiO-石墨烯纳米复合材料可用于超级电容器电极材料。通过电化学测试，花状NiO-石墨烯复合材料显示出比多面体复合材料更高的比电容，在5 mV s-1的扫描速率下比电容高达500 F g-1，而多面体NiO-石墨烯复合材料提供了更好的长期循环稳定性，在1 M KOH电解质中3000次循环后仍保留84%的比电容。
Flowerlike and polyhedral NiO–graphene nanocomposites have been successfully synthesized using a facile hydrothermal method. The formation mechanism of the two nanocomposites with different morphologies has been studied. The resulting products are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopic analysis (XPS), thermogravimetry (TG), and the Brunauer–Emmett–Teller (BET) method. The prepared NiO–graphene nanocomposites with different shapes can be used for supercapacitor electrode materials. Through electrochemical tests, the flowerlike NiO–graphene composite shows higher specific capacitance than that of the polyhedral one with a specific capacitance as high as 500 F g−1 at a scan rate of 5 mV s−1 while the polyhedral NiO–graphene composite delivers better long-term cycle stability with 84% specific capacitance remaining after 3000 cycles in a 1 M KOH electrolyte.