Abstract
A microwave anodic deposition process was developed to prepare MnO2/Ni-doped MnO2 films on carbon fibersfor the fillers of cement composites (CFRC) to enhance both thermoelectric and compression performances simultaneously. The resulting CFRCs were designated as M-MnO2/CFRC and M-Ni-MnO2/CFRC, respectively. The results showed that the M-Ni-MnO2/CFRC exhibited the best thermoelectric performance at 313K, achieving a Seebeck coefficient of −873.9 μV/K, electrical and thermal conductivities of 3.42 S/m and 0.613 W/mK, respectively, and thus ZT and PF values of 1.69 × 10−3 and 3.42μW/(m·K2), respectively. The superior thermoelectric performance of the M-Ni-MnO2/CFRCs compared to that of the M-MnO2/CFRCs or the MnO2/CFRCs without microwave involvement in electrodeposition was attributed to the increased density of states at the Fermi level in MnO2 due to Ni doping, and the better interfacial scattering electron carrier effect. Surprisingly, the compression strength of the M-Ni-MnO2/CFRC reached 82.5 MPa, marking a 171.2 % increase, while the elongation reached 1.71 %, a 3.50 times increase compared to pure cement.
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