Effect of moisture on the thermoelectric properties in expanded graphite/carbon fiber cement composites

Effect of moisture on the thermoelectric properties in expanded graphite/carbon fiber cement composites
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水分对膨胀石墨/碳纤维水泥复合材料热电性能的影响

DOI:
10.1016/j.ceramint.2017.05.088
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发表时间:
2017-10
影响因子:
5.2
通讯作者:
Zhengbo Nie
Zhengbo Nie
中科院分区:
材料科学1区
文献类型:
--
作者:
Jian Wei(魏剑);Qian Zhang;Lili Zhao;Lei Hao;Zhengbo Nie

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介绍了一种干混成型工艺制备膨胀石墨/碳纤维水泥复合材料(EG-CFRC)。湿度对EG-CFRC的热电性能有显著影响。含水率越高,绝对塞贝克系数越大。在33 °C时,水分含量为14.98%时,绝对塞贝克系数最大,为11.59 μV/°C。当含水率为11.44%时,电导率达到最大值0.78 S cm-1。此外,最大功率因数7.85×10−4µW m− 1 K − 2是在33 °C、湿度为11.44%时计算得出的。在较高的含水率下,EG-CFRC的载流子散射、极化效应和高密度缺陷界面是其热电性能提高的主要原因。
A kind of dry mixing and pressing process was introduced to prepare expanded graphite/carbon fiber cement composites (EG-CFRC). Significant effect of moisture on the thermoelectric properties of EG-CFRC was observed. The higher the moisture content is, the greater the absolute Seebeck coefficient. The maximum of absolute Seebeck coefficient 11.59 μV/°C was obtained with moisture of 14.98% at 33 °C. Simultaneously, the maximum of electrical conductivity 0.78 S cm−1was got with moisture of 11.44%. Furthermore, the largest power factor 7.85×10−4µW m−1K−2was calculated at 33 °C with moisture of 11.44%. The carrier scattering, polarization effects and high density defects interface of EG-CFRC are attributed to the enhancement of thermoelectric properties in the case of higher moisture content.
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