Ionic thermocells have relatively high thermopowers based on thermogalvanic effect, but their small electricity output is still insufficient for practical applications. We demonstrated a highly ionic conductive, anti-freezing stretchable thermogalvanic...
Power generation through harvesting
human thermal energy provides
an ideal strategy for self-powered wearable design. However, existing
thermoelectric fibers, films, and blocks have small power generation
capacity and poor flexibility, which hinders the development of self-powered
wearable electronics. Here, we report a multifunctional superelastic
graphene-based thermoelectric (TE) sponge for wearable electronics
and thermal management. The sponge has a high Seebeck coefficient
of 49.2 μV/K and a large compressive strain of 98%. After 10 000
cyclic compressions at 30% strain, the sponge shows excellent mechanical
and TE stability. A wearable sponge array TE device was designed to
drive medical equipment for monitoring physiological signals by harvesting
human thermal energy. Furthermore, a 4 × 4 array TE device placed
on the surface of a normal working Central Processing Unit (CPU) can
generate a stable voltage and reduce the CPU temperature by 8 K, providing
a feasible strategy for simultaneous power generation and thermal
management.
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