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Two kinds of new bio‐chars were produced from carbonization of waste hazelnut wood as low‐cost and eco‐friendly supporting matrices to simultaneously solve the seepage and low thermal conductivity problem of capric acid (CA) used as a phase change materials (PCM) for thermal management applications. In the prepared seepage‐free composites, the CA was impregnated by 52 and 64 wt% into porous structure...