Enhanced thermoelectric properties of carbon fiber reinforced cement composites |
| |
| Affiliation: | 1. College of Materials and Mineral Resources, Xi''an University of Architecture and Technology, Xi''an 710055, China;2. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China;1. College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China;2. College of Material Science and Engineering, Chongqing University, Chongqing 400045, China;1. School of Civil Engineering, Dalian University of Technology, Dalian 116024, China;2. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;3. Department of Mechanical & Energy Engineering, University of North Texas, Denton, TX 76203, USA;4. School of Machinery and Automation, Wuhan University of Science and Technology, Wuhan 430081, China;1. Lyles School of Civil Engineering & School of Materials Engineering, Sustainable Materials and Renewable Technology (SMART) Lab, Purdue University, West Lafayette, IN, USA;2. Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA;1. Department of Applied Science and Technology, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129, Torino, Italy;2. National Interuniversity Consortium of Materials Science and Technology (INSTM), Florence, Italy;3. Massachusetts Institute of Technology, 77 Massachusetts Ave, 02139, Cambridge, MA, USA;4. Department of Structural, Geotechnical and Building Engineering, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129, Torino, Italy;1. School of Materials Science and Engineering, Tongji University, Shanghai 201804, China;2. Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao Technological University, Qingdao 266033, China;3. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China |
| |
| Abstract: | ![]()
Thermoelectric properties of carbon fiber reinforced cement composites (CFRCs) have attracted relevant interest in recent years, due to their fascinating ability for harvesting ambient energy in urban areas and roads, and to the widespread use of cement-based materials in modern society. The enhanced effect of the thin pyrolytic carbon layer (formed at the carbon fiber/cement interface) on transport and thermoelectric properties of CFRCs has been studied. It has been demonstrated that it can enhance the electrical conduction and Seebeck coefficient of CFRCs greatly, resulting in higher power factor 2.08 µW m−1 K−2 and higher thermoelectric figure of merit 3.11×10−3, compared to those reported in the literature and comparable to oxide thermoelectric materials. All CFRCs with pyrolytic carbon layer, exhibit typical semiconductor behavior with activation energy of electrical conduction of 0.228-0.407 eV together with a high Seebeck coefficient. The calculation through Mott’s formula indicates the charge carrier density of CFRCs (1014–1016 cm−3) to be much smaller than that of typical thermoelectric materials and to increase with the carbon layer thickness. CFRCs thermal conductivity is dominated by phonon thermal conductivity, which is kept at a low level by high density of micro/nano-sized defects in the cement matrix that scatter phonons and shorten their mean free path. The appropriate carrier density and mobility induced by the amorphous structure of pyrolytic carbon is primarily responsible for the high thermoelectric figure of merit. |
| |
| Keywords: | B. Composites C. Electrical properties E. Functional applications |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
