The Effect of Temperature on the Hydrogen Adsorption Performance of Graphene-Based Composites

Alkyne-PVA-(GO-PdO) based on graphene oxide (GO) and loaded with palladium oxide (PdO) and alkyne-PVA has promising application prospects in low-temperature storage and transportation. To investigate the effect of temperature on the hydrogen absorption performance of Alkyne-PVA-(GO-PdO), samples of Alkyne PVA - (GO-PdO) are prepared by self-assembly method and characterized by Raman spectroscopy, XRD, SEM, and FTIR. The hydrogen absorption performance of the material is tested at different temperatures using static expansion method and adsorption isotherms are plotted. The results show that the saturated hydrogen absorption capacity of Alkyne-PVA-(GO-PdO) at 20℃, 50℃, and 80℃ is 1412.58 Pa·L/g, 1604.82 Pa·L/g, and 2133.76 Pa·L/g, respectively. The hydrogen absorption performance of Alkyne-PVA-(GO-PdO) improves with the increase in temperature. This is attributed to the complex reaction mechanism and unique chemical structure of Alkyne-PVA- (GO-PdO). The hydrogen absorption process of Alkyne-PVA-(GO-PdO) not only involves the reaction of PdO, Alkyne-PVA with hydrogen and the catalytic reaction of intermediate product palladium, but also the diffusion process of hydrogen. The rise of temperature promotes the desorption of water molecules generated by the reaction between PdO and hydrogen, enhances the catalytic performance of palladium, accelerates the diffusion of hydrogen, and thus improves the hydrogen absorption performance of Alkyne-PVA-(GO-PdO). The hydrogen absorption reaction mechanism of Alkyne-PVA-(GO-PdO) composite materials is explored, which provides a theoretical basis and experimental reference for the practical application of composite materials.