Thermoelectric performances of graphene/polyaniline composites prepared by one-step electrosynthesis
Thermoelectric performances of graphene/polyaniline composites prepared by one-step electrosynthesis
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DOI：
10.1039/c5ra17324h
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发表时间：
2015-01-01
期刊：
影响因子：
3.9
通讯作者：
Imae, Ichiro
中科院分区：
文献类型：
--
作者：
Harima, Yutaka;Fukumoto, Saki;Imae, Ichiro
以氧化石墨烯(GO)和苯胺单体为原料，采用简易的电化学方法一步法制备了石墨烯/聚苯胺复合薄膜，并对其热电性能进行了研究。在掺氟氧化锡电极上制备的复合膜的电导率与氧化亚锡和苯胺的质量比有关，在氧化亚锡与苯胺的质量比为5：1~10：1时，复合膜的电导率出现峰值，为30 S cm(-1)，而塞贝克系数与氧化亚锡的质量比关系不大。复合薄膜的最大功率因数(Pf)约为1muWm(-1)K-2。用不锈钢电极代替FTO电极后，GO/苯胺摩尔比为8：1的复合膜的电导率提高到约130 S cm(-1)。结果表明，室温下的pF和无量纲热电优值(ZT)分别达到3.6mW·m(-1)K~(-2)和0.008。在迄今报道的石墨烯/聚苯胺复合材料中，ZT值是最高的。在电化学测试和X射线光电子能谱的基础上，讨论了不锈钢电极电导率提高的可能原因。
Composite films comprising graphene and polyaniline were prepared in one step by a facile electrochemical technique with graphene oxide (GO) and aniline monomer as raw materials, and their thermoelectric properties were investigated. Electrical conductivities of the composite films generated on the fluorine-doped tin oxide (FTO) electrode were dependent on the weight ratio of GO and aniline, and they exhibited a peak value of 30 S cm(-1) at the GO/aniline ratio between 5 : 1 and 10 : 1, while Seebeck coefficients were less dependent on the weight ratio. The maximum power factor (PF) for the composite films was ca. 1 mu W m(-1) K-2. When the FTO electrode was replaced by the stainless steel electrode, conductivities of the composite films with the GO/aniline ratio of 8 : 1 were increased up to ca. 130 S cm(-1). As a result, the PF and the dimensionless thermoelectric figure-of-merit (ZT) at room temperature reached 3.6 mu W m(-1) K-2 and 0.008, respectively. The ZT value is the highest among those reported so far for graphene/PANI composites. Possible reasons for the conductivity enhancement on the stainless steel electrode are also discussed on the basis of electrochemical measurements and X-ray photoelectron spectroscopy.