具有显著Seebeck效应的碳纤维水泥基复合材料(Carbon fiber reinforced cement-based composites,简写为CFRC)近年来受到广泛关注。综述了CFRC的导电机理、Seebeck效应强化途径及其工程应用前景。CFRC的载流子类型主要包括离子、电子和空穴,并以空穴为主。碳纤维/碳纳米管掺杂,CFRC的 Seebeck系数可提高至约30μV/℃；钢纤维掺杂水泥基材料表现为 n型半导体,其 Seebeck可达68μV/℃；金属氧化物Bi2 O3掺杂可将CFRC的 Seebeck系数稳步提高到100.28μV/℃,而ZnO 和 Fe2 O3掺杂可使CFRC的Seebeck系数分别增大到3300μV/℃和2500μV/℃。这些研究有效地促进了CFRC在城市室外热量的转换收集、工业余热能量收集和长寿命结构健康监测传感器等领域的研究与发展。
Recently,carbon fiber reinforced cement-based composites (CFRC)has been concerned considerably due to its strong Seebeck effect.The electrical conduction mechanism,CFRC-Seebeck effect reinforcement approaches,and potential applica-tions of CFRC are reviewed in this paper.The carrier types of CFRC is mainly related to ionic,electronic and hole carriers,and the hole carriers play the most important role.The Seebeck coefficient of about 30μV/℃ can be obtained by adding carbon fibers or car-bon nanotubes.The steel fiber reinforced cement-based composites belongs to an n-type semiconductor,and its Seebck coefficient can be increased to 68μV/℃.The CFRC-Seebeck coefficient of 100.28μV/℃ can be obtained by mixing Bi2 O3 ,and the largest Seebeck coefficients of 3 300μV/℃ and 2 500μV/℃ can be obtained by adding ZnO and Fe2 O3 ,respectively.These studies have effectively promoted the research and development of CFRC in the fields of urban heat harvesting,energy conservation in buildings,the waste heating collection and structural self-sensing.
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