Enhanced Thermal Conductivity of Wheat Straw Biochar/PEG Composite Materials with High-temperature Reduced Copper Nanospheres

The pre-deposited copper nanospheres within the WSB framework established an efficient thermal conduction network prior to PEG impregnation, thereby achieving superior heat transfer performance, while the porous biochar structure ensured effective confinement of PEG. Furthermore, the ss-PCMs retained a high latent heat capacity of 59.21 J/g and demonstrated leakage-free property and excellent cycling stability with 98% retention after 100 thermal cycles.

To validate the generalizability of this strategy, comparative experiments were performed using peanut shell and corn stover biochars as alternative matrices, confirming the broad applicability of the approach. This research provides a generalized and alternative approach for enhanced thermal conductivity of high-performance ss-PCMs and the prepared ss-PCMs hold great potential in advanced thermal management systems.