Thermoelectric (TE) building materials have the potential to revolutionize sustainable architecture by converting temperature differences into electrical energy. This study introduces geopolymeric TE materials enhanced with manganese dioxide (MnO ) as a modifying agent. Calorimetric experiments examine the impact of MnO on geopolymerization. Mechanical tests show that adding MnO (up to 5% by weight) improves the geopolymer composite's strength, achieving a peak compressive strength of 36.8 MPa. The Seebeck effect of the MnO -modified geopolymeric composite is also studied. The inclusion of MnO boosts the Seebeck coefficient of the geopolymer, reaching a notable 4273 µV C at a 5% MnO dosage. This enhancement is attributed to an increase in the density of states (DOS) and a reduction in relaxation time. However, excessive MnO or high alkali levels may adversely affect the Seebeck coefficient by lengthening the relaxation time.
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