  We explore the role of proximity-induced odd-frequency pairing in the
thermoelectricity of a ferromagnet when coupled to a conventional $s$-wave
spin-singlet superconductor through a spin-active interface. By varying both
the polarization and its direction in the ferromagnet and the interfacial
spin-orbit interaction strength, we analyze the behavior of all
proximity-induced pair amplitudes in the ferromagnet and their contributions to
the thermoelectric coefficients. Based on our results for the Seebeck
coefficient, we predict that odd-frequency spin-triplet Cooper pairs are much
efficient than the conventional spin-singlet even-frequency pairs in enhancing
thermoelectricity of the junction, especially mixed-spin triplet pairing is
favorable. Our results on the thermoelectric figure of merit show that
ferromagnet/superconductor junctions are very good thermoelectric systems when
superconductivity is dominated by odd-frequency pairing.
