Introduction of Pr_0.7Sr_0.3MnO₃/PrMn₂O₅/Fe₃O₄/GO nanocomposite as an active compound for hydrogen storage: Step by step synthesis and characterization

As hydrogen is an alternative to fossil fuels that are hazardous to the environment, this study explores the application of Pr_0.7Sr_0.3MnO₃/PrMn₂O₅/Fe₃O₄/graphene oxide (GO) as a potentially effective nanocomposite for the storage of hydrogen. As a means of evaluating the contribution of each component, this nanocomposite was prepared in several stages. Various analyses were conducted to study the effects of Sr, Fe₃O₄ and GO. According to the results, Sr is responsible for increasing the amount of charge carriers that are capable of storing hydrogen. The Sr amount was therefore optimized by altering the calcination temperature. At higher temperatures, there is a reduction in the amount of Sr. In addition, increases in the calcination temperature as well as the presence of Fe₃O₄ may result in mixed metal oxides being formed as a result of thermodynamic reactions. As a result, PrMn₂O₅ became one of the components of the Fe₃O₄-containing nanocomposites. Upon the presence of Fe₃O₄, Pr-manganite's magnetic property changed from paramagnetism to super-paramagnetism, and, in addition, magnetization decreased upon the presence of GO. According to electrochemical studies, the anodic peak current of the multi-component composite was 3183.37 μA whereas this was 1126.48 μA for pristine Sr-doped manganite.