  The discovery of topological materials has provided new opportunities to
exploit advanced materials for heat-to-electricity energy conversion as they
share many common characteristics with thermoelectric materials. In this work,
we report the magneto-thermoelectric properties and Nernst effect of the
topological Weyl semimetal NbP. We find that polycrystalline, bulk NbP shows a
significantly larger Nernst thermopower than its conventional thermopower under
magnetic field. As a result, a maximum Nernst power factor of ~ 35*10-4 Wm-1K-2
is achieved at 9 T and 136 K, which is 4 times higher than its conventional
power factor and is also comparable to that of state-of-the-art
thermoelectrics. Moreover, the Nernst power factor maintains relatively large
value over a broad temperature range. These results highlight that the
enhancement of thermoelectric performance can be achieved in topological
semimetals based on the Nernst effect and transverse transport.
