  This paper investigates thermal transport in a nanocomposite system "porous
silicon matrix filled with ionic liquid". First, the thermal conductivity and
heat capacity of two imidazolium and one ammonium ionic liquids were evaluated
using the photoacoustic approach in piezoelectric configuration and
differential scanning calorimetry, respectively. Then, the thermal transport
properties of the composite system "ionic liquid confined inside porous silicon
matrix" were investigated with the photoacoustic approach in gas-microphone
configuration. It was found that a significant enhancement of the thermal
conductivity of the composite when compared to the individual components, i.e.
(i) more than two times for pristine porous silicon and (ii) more than eight
times for ionic liquids. These results provide new paths for innovative
solutions in the field of thermal management in highly efficient energy storage
devices.
