N-octadecane /bio-char composite: Preparation, characterization and energy storage properties

Abstract

Biochar (BC); is a carbonized material rich in functional groups that has many different uses such as soil reclamation, energy storage, anodic material in batteries, and electromagnetic emission capture in buildings. The n-octadecane (OD) is a favorable organic phase change material (PCM) for thermal energy storage, which can be applied in building energy storage materials due to its proper phase change temperature. In this study, BC was impregnated with the OD in the vacuum oven at 0.08 Mbar at 70 °C for 3h. The weight percantage gain was found to be 50% after impregnation. Leakage of OD from BC after impregnation was detected by leakage test. The physico-chemically characterize of thermally treated wood samples were examined by fourier transform infrared spectroscopy (FT-IR). Thermal degradation stability of the samples were analyzed by thermogravimetric analyses (TGA) and diffential scanning calorimetry (DSC) analysis. According to results, no leakage was observed after the leakage test in BC samples impregnated with OD. A significant amount of residue was evident in the BC after it was infused with OD, indicating that its decomposition commenced only at markedly high temperatures.