High Thermopower in a Zn-Based 3D Semiconductive Metal–Organic Framework

Conductive metal–organic frameworks
(c-MOFs) have drawn
increasing attention for their outstanding performance in energy-related
applications. However, the majority of reported c-MOFs are based on
2D structures. Synthetic strategies for 3D c-MOFs are under-explored,
leaving unrealized functionality in both their structures and properties.
Herein we report Zn-HAB, a 3D c-MOF comprised of hexaaminobenzene
and Zn­(II). Zn-HAB is shown to have microporosity with a band gap
of approximately 1.68 eV, resulting in a moderate conductivity of
0.86 mS cm–1 and a high Seebeck coefficient of 200
μV K–1 at 300 K. The power factor of 3.44
nW m–1 K–2 constitutes the first
report of the thermoelectric properties of an intrinsically conductive
3D MOF.