To realize the sustainable
energy supply in a smart city, it is
essential to maximize energy scavenging from the city environments
for achieving the self-powered functions of some intelligent devices
and sensors. Although the solar energy can be well harvested by using
existing technologies, the large amounts of wasted wind energy in
the city cannot be effectively utilized since conventional wind turbine
generators can only be installed in remote areas due to their large
volumes and safety issues. Here, we rationally design a hybridized
nanogenerator, including a solar cell (SC) and a triboelectric nanogenerator
(TENG), that can individually/simultaneously scavenge solar and wind
energies, which can be extensively installed on the roofs of the city
buildings. Under the same device area of about 120 mm × 22 mm,
the SC can deliver a largest output power of about 8 mW, while the
output power of the TENG can be up to 26 mW. Impedance matching between
the SC and TENG has been achieved by using a transformer to decrease
the impedance of the TENG. The hybridized nanogenerator has a larger
output current and a better charging performance than that of the
individual SC or TENG. This research presents a feasible approach
to maximize solar and wind energies scavenging from the city environments
with the aim to realize some self-powered functions in smart city
